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Jinx - MG 1275 rebuild

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Jinx - MG 1275 rebuild

Postby Croker » Wed 2nd Mar 2011, 06:26pm

First, a short history lesson.

I’ve owned Jinx since 2004 and quite literally hit the mini scene with a bang when the head gasket went on route to my first show, the Riv run. Following loads of issues (hence the name Jinx!) it was clear that the engine and auto box were both shot. MattPink kindly donated a 1275 metro engine as well as a manual box and subframe. These have been in Jinx ever since and although tired and smokey have never given me any problems.

In between then and now, Jinx has spent a couple of years sitting on the drive untouched. Until the summer of 2009 when we embarked on his restoration.

Now looking all sleek and sexy its time to turn attention to the engine which is well past its best.

Current spec is a bog standard metro 1275 with a leaded head, HIF44 carb, stage 1 kit and that’s bout all I know. I've no idea of age or milage. Had it on the rollers last about 18 months ago when he produced 54bhp.

I'm going to try my very best to keep this journal updated but i'm planing to take my time on the rebuild. Mainly so i can source any parts as cheaply as possible and because i have no idea what im doing and i dont want to cock it up!


To be continued…

How he looks now.
Image

Current metro engine
Image

Edit: the engine pic above was taken a while ago and it now looks oily and grotty
Last edited by Croker on Thu 3rd Mar 2011, 12:41am, edited 1 time in total.
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Re: Jinx - MG 1275 rebuild

Postby philster » Wed 2nd Mar 2011, 06:44pm

looking good

what's the plans for the engine, standard or tweaked?
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 2nd Mar 2011, 07:58pm

Cheers dude,

The plan...


As i plan to take my time and i dont want to take Jinx of the road for too long. The first thing was to source another engine. Ive been looking for something fairly local for a while but everything was either going for silly money or didn't suiting my needs.

So i've cast my search a bit further afield i've just picked up an MG Metro unit from Southampton. It also came with all the other bolt on bits in a big box and it was well worth the drive!

I'm planing on rebuilding the head, engine and box, all to standard spec.

Despite looking a bit groty it seems in really good nic. Its done 70,000 miles (apparently), nothings seized, head came off no probs, bores look good with hardly any wear. Although i'll check properly when the bore gauge I've ordered arrives.

Let the fun begin...
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Re: Jinx - MG 1275 rebuild

Postby philster » Wed 2nd Mar 2011, 08:32pm

good choice I love the MG lump in bluey, been very reliable too.
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Re: Jinx - MG 1275 rebuild

Postby Zippyrude » Wed 2nd Mar 2011, 10:01pm

nice one
gimme a call pete, i can chat to you about a good way to approach this project.
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 2nd Mar 2011, 10:13pm

Zippyrude wrote:nice one
gimme a call pete, i can chat to you about a good way to approach this project.



wicked! I'll give you a call over the weekend dude.

I can do with all the help and advice i can get! :wink:
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Re: Jinx - MG 1275 rebuild

Postby Zippyrude » Wed 2nd Mar 2011, 10:29pm

Croker wrote:
Zippyrude wrote:nice one
gimme a call pete, i can chat to you about a good way to approach this project.



wicked! I'll give you a call over the weekend dude.

I can do with all the help and advice i can get! :wink:


cooleo :)

dont buy anything yet mate! re dial bore gauge, send it back. you can borrow mine. plus you need micrometers to use with it to give you the measurements (which i also have) ;)
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 2nd Mar 2011, 10:39pm

excellent! not actually bought anything yet mate.

Any specialist tools you recommend i'll need to buy?

I'll strip the engine and bring the block over and you can show me how to use them. :wink:
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Re: Jinx - 1275 MG engine, head and box rebuild

Postby Croker » Wed 9th Mar 2011, 02:59pm

Right so popped along to AC's engine club last night and under the expert eye of AC and Zippy started on the head rebuild.

AC confirmed that the head is an unleaded stock MG metro one and is in virgin condition and hasn’t been messed with or previously skimmed. So is a good starting point for a rebuild.

First job was to remove the valves using a valve spring compressor. Once removed the collets, cap and springs from each valve were placed in a zip lock bag and numbered in relation to the valve number. I numbered them 1-8, with 1 being closest to the fan end.

Next the valve ends and collets were tested for wear. This was done by locating each valve into its corresponding collets and seeing if there was any vertical movement. These were all checked and were fine.
Image


The valve stems were then tested with a micometer and again showed minimal wear. The tops of the valve were also checked with a straight edge to insure they hadn’t bowed in, caused by the valves being smashed in the head as a result of hard driving. Again all good.

Each valve was then placed in to a side mounted drill/lathe and a piece of metal was used to remove the grot and carbon build up. They were then finished off with some course sand paper.
Image

Next the valves were refaced to remove the pitting.
Image

before:
Image
Image

After:
Image
Image


Back to the head and the next job was to test for wear in the valve guides. If there is any wear in the guides the valve will be able to move back and forth rather than side to side. This is due to the way the rocker pushes on the valve stem. Wear was measured using a dial gauge and any guide showing movement of about 15 thou+ would be heading for the bin. All of the inlets were showing under 15 but the exhausts were between 15 – 22 thou so will be changed.
Image

Next job now is to clean up the head and to push out and replace the old guides.

So far so good!

To be continued...

same Bat time, same Bat channel!!!
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Re: Jinx - MG 1275 rebuild

Postby Zippyrude » Wed 9th Mar 2011, 11:12pm

quality mate 8.)
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 9th Mar 2011, 11:23pm

Zippyrude wrote:quality mate 8.)



Cheers dude.

Thanks to you and Ade for dispensing your pearls of wisdom! :wink:
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Re: Jinx - MG 1275 rebuild

Postby patlink » Sat 12th Mar 2011, 10:24am

looks really good
your are the in the best hands with AC and Zippy
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Re: Jinx - MG 1275 rebuild

Postby Darky32 » Tue 15th Mar 2011, 06:12pm

Great rebuild i will be watching this one with interest :wink:
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Re: Jinx - MG 1275 rebuild

Postby essexminicity » Wed 23rd Mar 2011, 08:12pm

Hi Croker,

Glad to see that you're still into your Minis after all these years - that's a lovely motor you've got there, right up my street style-wise. I've still got my white City but after an 'incident' last January it's sat on my brother's driveway for a year doing nothing while I became a dad for the first time. Anyway, it's getting some attention now at the weekends and the aim is to get it road-worthy in time for a family Mini convoy to the IMM. No concours car, just enough to pass an MOT for now.

What happened to your Paul Smith? And is Jinx that red Mayfair you used to have on your driveway?
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 23rd Mar 2011, 09:17pm

hello mate, great to hear from you. And many congrats for your first born.

Glad to see your mini is getting some love. why not start a journal so we can watch your progress. It's always nice to see a mini rising from the flames! :wink:

The PS went ages ago. About 4 yeas ago maybe. Wow time flies! :shock:

Yep Jinx is the old red mini. As you can see a lot of work has gone into him! (and he's still not finished! :lol: )
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Re: Jinx - MG 1275 rebuild

Postby essexminicity » Wed 23rd Mar 2011, 10:05pm

The car looked like this after the prang. Nothing too bad and I was fine, but the insurance people wrote it off as uneconomical to repair. I paid £30 to get it back from them and now I've now stripped it right back and removed the engine prior to welding in a replacement outer and inner wing and front panel. The passenger wing is good enough to keep.

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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 23rd Mar 2011, 10:24pm

ah dude, that a shame but glad you were ok. Now pull ya finger out and start a journal and get him running! :wink:




Anyway we digress…


Right, a bit more progress on the head last night.

Job number one was to give the head a really good clean and de-coke inside and out with a drill and a wire brush. This gave the chance to give the head a good inspection for any faults.
Image

Next the head was placed on this mighty contraption and the worn exhaust guides were pushed out. The head was then given a quick clean and the press was then used again to push the new guides into the block.
Image

The new guides were then reamed with a 9/32" hand reamer. This is a really important part of the re-build that is often ignored by many ‘professional’ engine builders. If it’s not done and the guides are to tight the valves can seize causing catastrophic results!
Image

As this is a Metro head the hole for the mini heater tap was drilled out and all the threads were re-tapped and cleaned with brake cleaner and an air line.

The last job of the night was to lap the valves with some of AC's posh course diamond compound.
Image

And that leave us with this.
Image

Now with the clock approaching 2300, my 4:50 am start had caught up with me so i called it a night.

The sage continues....
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Re: Jinx - MG 1275 rebuild

Postby Nozzle » Thu 24th Mar 2011, 08:35am

Croker wrote:The new guides were then reamed with a 9/32" hand reamer. This is a really important part of the re-build that is often ignored by many ‘professional’ engine builders. If it’s not done and the guides are to tight the valves can seize causing catastrophic results!
Image


Hum, interesting - this can be done by hand?!?! Or rather, I'm surprised it's not done in a pillar drill? Does the design of the reamer automatically 'square up' in the stem so the valve seats properly and not on the wonk?

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Re: Jinx - MG 1275 rebuild

Postby Croker » Thu 24th Mar 2011, 11:37am

Yep, can be done by hand.

AC uses a 9/32 parallel hand reamer similar this.
http://www.garvintools.com/index.cfm?md ... ductID=275
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Re: Jinx - MG 1275 rebuild

Postby ACDodd » Thu 24th Mar 2011, 07:32pm

Doing this reaming operation in a pillar drill or milling machine will result in an over-sized hole or broken reamer. Reamers follow the hole in the guide. The mistake you are making is that the hole in the guide is perpendicular to the face of the head. In fact this will usually be anything but! The guides are not usually machined perfectly nor are the holes in the head that the guide fits into. If you want to complete the operation successfully in a mill or pillar drill you would need to machine the guides original hole square by drilling through a solid guide. Then you could ream to finish. However the setup time and machining time at todays hourly rates would not leave any change from £150!!! You would still also have to re-cut the seats on top of that cost. The reamer I use here is a modified hand reamer it does follow the original bore of the guide. The seats are re-cut as part of the guide fitting operation, a perfect seal is the result.

AC
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Re: Jinx - MG 1275 rebuild

Postby Croker » Thu 24th Mar 2011, 07:44pm

AC, thanks for clearing that up.
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 30th Mar 2011, 01:58pm

A quick update.

Valve seats being recut to ensure a good seal.
Image

Also stripped, cleaned and refaced the rockers read for re-assembley.

The head is now with AC to be skimed and the valve springs need testing for their poundage. Then its paint and assembly. :rock:
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Re: Jinx - MG 1275 rebuild

Postby Croker » Fri 15th Apr 2011, 02:17pm

The head is now back from being skimmed! :rock:


As a result there were a few sharp burrs, so all the edges had a quick going over with a file.
Image

The head was then given a good clean and the first coat of undercoat has been applied. Hopefully the second coat and the shiny top coat will be on soon so i can post some pics on my next update.

Another thing to consider as part of a good rebuild is not to overlook the valve spring. Springs that are too stiff could cause lobe wear on the cam and too soft and the valves will bounce in the head and wont seal properly, resulting in poor running.

As im trying the keep the cost of the rebuild down, rather than go and buy a new set of spring the old ones were tested to see if there were giving the correct poundage and suitable to be reused.

They're tested simply by using a pillar drill, dial gauge and a set of bathroom scales.
Image

My set were showing some quite varying results with a open poundage of between 114lbs-119lbs and a closed rate of between 70lbs-75lbs. Such variations will mean the valves are opening and closing a different rates. So AC's rather large collection of springs was delved into until we had a full set of 8 springs all with a same rating of 75 to 119lbs.

So work on the head is coming to a close and next time i should be posting some pics of the head in all its glory.

to be continued.....
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Re: Jinx - MG 1275 rebuild

Postby Croker » Fri 15th Apr 2011, 02:40pm

in some other news i've been having some real issues getting the sodding flywheel off! I've tried heating, shocking, lubing, 2 pullers (broke the first one), a 5ft piece of scaffold, swearing at it and the smegger wouldn't budge!

And yes i took the lock washer out! :wink:

In the end i've taken a grinder to it! I've managed to thin out the boss with the grinder and cut a few small groves in it with a dremal. This gave me enough flex in the metal to re-apply the puller and off it finally popped!

Phew!!!
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Re: Jinx - MG 1275 rebuild

Postby Zippyrude » Fri 15th Apr 2011, 02:50pm

nice one Pete
I'll take a look in the garage for a spare boss for ya
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Re: Jinx - MG 1275 rebuild

Postby Croker » Fri 15th Apr 2011, 03:05pm

excellent! Cheers matey!
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Re: Jinx - MG 1275 rebuild

Postby philster » Fri 15th Apr 2011, 05:22pm

I usually find if they are really stubborn that getting it on the puller and under as much tension as it will stand then just leaving it works.

Had a few off this way usually left it while i'm doing something else then hear a bang and the flywheel in on the floor :lol:
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Re: Jinx - MG 1275 rebuild

Postby Croker » Fri 15th Apr 2011, 06:00pm

had it under tension for a fortnight and tightened it a little each day before the puller finally surrendered! :roll:

Trust me mate i tried all the tricks and stubborn wasn't the word!
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Re: Jinx - MG 1275 rebuild

Postby philster » Fri 15th Apr 2011, 08:47pm

Croker wrote:had it under tension for a fortnight and tightened it a little each day before the puller finally surrendered! :roll:

Trust me mate i tried all the tricks and stubborn wasn't the word!


rhubarb must have been well stuck!, was the taper nice an smooth or pitted (most i've had that were a pain were badly pitted)
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 20th Apr 2011, 10:12pm

philster wrote:
rhubarb must have been well stuck!, was the taper nice an smooth or pitted (most i've had that were a pain were badly pitted)


No it wasn't actually. It's a complete mystery! AC's had a quick look over the crank and bar the big ends needing a regrind it's in pretty good nic.

Anyway a couple of quick pics.

Head's now painted and look lovely.
Image
Image

Also gone from this;
Image


To this;
Image

Been quite lucky so far with the head and the crank but it looks like i wont be getting the hat trick with the gearbox. We're yet to take a proper examination but so far 2nd gear and baulk rings are goosesed.
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 22nd Jun 2011, 12:43pm

Work and now commence on the gear box.

Once everything was stripped and cleaned the case and other bit were all examined for wear/cracks etc.

First bit needing changing was the 3rd motion shaft, which was showing signs of wear. This was swapped for a good used one found in the bottom of AC’s vast parts bin.

Not come out too great on the pic but you can just about make out the thin band of pitting about 1/4 of the way down.

Image

This led to a closer look at the bearing which was mullered. You can see the horribleness at the top of the rollers.

Image

The poor old MG box was showing evidence of its boy racer past. Exhibit A was the second gear. Which like the averange Dagenham neverdowell has had all it’s teeth broken.

Image

Again, swapped for one AC just so happened to have laying around.

Image

Also purchased 3 new genuine baulk rings from mini spares.
http://www.minispares.com/Product.aspx? ... 758&title=

The shaft has now been rebuilt and placed in the case which has been chemically cleaned.

Image
Image
Image

Just need to get a centre oil pick up and a 3.1 final drive and the box can be completed.
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Re: Jinx - MG 1275 rebuild

Postby Croker » Thu 28th Jul 2011, 05:39pm

Couple of quick updates.

So i now have a box full of cogs. Also opted for the centre oil pick up to prevent oil starvation when the Mrs does a roundabout sideways! :roll:


Hmmmmmmm, cogage!!!!!!

Image

Aslo managed to pick up a 3:1 final drive from good old ebay for £60. Happy days!


While waiting for the gear box bits to arrive i've done a complete refurb on the the alternator.

Scabby old one:
Image

Like new but older one:
Image


Things are progressing so now its finally time to start looking at the block. A dial gauge has been used to check the bores for wear. Basically there's about 5tho of wear meaning a re-bore is on the cards.

D'oh!!!
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Re: Jinx - MG 1275 rebuild

Postby Zippyrude » Thu 28th Jul 2011, 06:03pm

Thats rad dude!
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Re: Jinx - MG 1275 rebuild

Postby patlink » Thu 28th Jul 2011, 08:07pm

if i had AC or Rudi closer to hand i would take my gearbox from the project a part.

looks great an engine but getting some much 100% attention just the way it is meant to be.

great work
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Re: Jinx - MG 1275 rebuild

Postby Croker » Thu 28th Jul 2011, 08:21pm

Cheers guys. :wink:

Gotta say i'm really enjoying the rebuild. Already thinking about what to build next! :D
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Re: Jinx - MG 1275 rebuild

Postby Zippyrude » Thu 28th Jul 2011, 09:56pm

patlink wrote:if i had AC or Rudi closer to hand i would take my gearbox from the project a part.


pat, you're always welcome to pop down one weekend and we can strip a box or two with some cups of tea and we can inspect the bits and get a plan together for the rebuild. :)

the real problem is to get a decent box you probably need a few of em to pull out the best bits.
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Re: Jinx - MG 1275 rebuild

Postby patlink » Thu 28th Jul 2011, 10:30pm

Zippyrude wrote:
patlink wrote:if i had AC or Rudi closer to hand i would take my gearbox from the project a part.


pat, you're always welcome to pop down one weekend and we can strip a box or two with some cups of tea and we can inspect the bits and get a plan together for the rebuild. :)

the real problem is to get a decent box you probably need a few of em to pull out the best bits.

oh how i would love to

i have got a 4500miles rebuilt gearbox for my project that want check before really 100% on it because the rest of the engine is getting built to the best i can measure, check before fit.

sorry for hi-jacking the thread will post in mine very soon again
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Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 19th Oct 2011, 05:42pm

Hello boys and girls,

Well things slowed down a little in August and September due to me working like a Japanese prisoner of war. Happily things are back on tack with a complete strip and rebuild of the starter motor.

I managed to acquire two pre-engaged motors. One came with the engine and the other was a refurbed one i bought years ago from a rover parts supplier. This one i managed to break by over tightening one of the bolts on the solenoid and it's been gathering dust in the garage ever since.

The plan was to strip both, examine the bits and put together one good starter motor form all the good parts.

Once all the good bit were gathered into one pile. Everything was cleaned, painted, the armature and brushes were refaced, then grease, reassemble and a bench test. Jobs a good 'en!

Now i just need something to bolt it to! :roll:

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Croker
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Drives: Jinx, a 1275 cooper look-alike!.

Re: Jinx - MG 1275 rebuild

Postby Croker » Thu 27th Oct 2011, 12:23am

Evening all,

Just a couple of quick pics.

4 of these bad boys have arrived. So work on the block can finally begin. :rock:

Minispares 1275+20:
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But before the block work can start i wanna finish off refurbing all the bolt on components. So i've striped and began cleaning the HIF44 carb.

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I hope i can remember how it all goes back together! :?
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Drives: Jinx, a 1275 cooper look-alike!.

Re: Jinx - MG 1275 rebuild

Postby Croker » Wed 14th Dec 2011, 03:39pm

Carb is now finished, fully refurbed and slightly modded.

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You'll notice the shiny new screw in the pic below. This is where the vac take off was originally before the carb was modded and the take off was moved to is new position.

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Having the vac take off located between the butterfly and the manifold results in a lumpier idle when a sportier cam such as the MG one is used. By blocking the old take off, drilling a new hole and re-fitting the take off on the other side of the butterfly, you'll have a smoother idle and better idle emissions.

You can see here the blocked old hole and the new hole with the butterfly slightly open.
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Drives: Jinx, a 1275 cooper look-alike!.

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