#206372 - 23/02/2004 14:49
Supra engine rebuild
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rob
carpal tunnel
Registered: 21/05/1999
Posts: 5285
Loc: Cambridge UK
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Patrick, Rob S and I spent last week tearing down my Supra 7MGTE engine. The head, block and crank are now with a machine shop requiring differing levels of work (the head is in a bad way, the block isn't too bad and the crank is fine). We found several loose head bolts and a perforated head gasket. There are also indications of oil starvation to the head, probably caused by a knackered oil pump.
Pics online here, for those who appreciate the oily end of a car:
http://community.webshots.com/user/projectsupra
I'll get the final machining quote tomorrow and if all goes well reassembly photos will follow in a few weeks.
Rob
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#206373 - 23/02/2004 15:11
Re: Supra engine rebuild
[Re: rob]
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loren
carpal tunnel
Registered: 23/08/2000
Posts: 3820
Loc: SLC, UT, USA
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#206376 - 23/02/2004 15:32
Re: Supra engine rebuild
[Re: rob]
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tfabris
carpal tunnel
Registered: 20/12/1999
Posts: 27652
Loc: Seattle, WA
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Remember: Assembly is the reverse of removal. 
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#206379 - 23/02/2004 16:32
Re: Supra engine rebuild
[Re: rob]
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belezeebub
addict
Registered: 11/01/2001
Posts: 579
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That is reason number 23 of why I HATE with a Passion boardering on insanity Newer Cars...
Give me a 1970 Suburban anyday of the week, you want to change th e spark plus and its raining just sit on the fender well and close the hood, you don't need 132 speical wrenches and a trained dwarf to work on it and there is no damm spagetti of hoses and wires all over the place.
No computer to generate cryptic error codes you have a rotor a fuel pump and just 1 cam shaft.
and they knew how to make cars back then I put 550000 Miles on my 1979 K-5 Blazer (rebuilt the tranny twice and other then normal wear and tear that was it)
190000 Miles on my 1989 Surburban and I replaced the normall stuff tires, brakes etc and that was it stock engine and stock tranny
1995 Blazer (Biggest POS on the planet) put less then 70k on it and have replaced the alt, timing cover gasket, rack and pinion, ball joints, ac compressor, CPI system, compute, wiper motor, wiper control circute, wiper switch and it still has a electrical malfunction they want to replace the wiring hardness on it.
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#206387 - 24/02/2004 12:46
Re: Supra engine rebuild
[Re: genixia]
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Roger
carpal tunnel
Registered: 18/01/2000
Posts: 4572
Loc: London, UK
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how to put them all back in
And this reminds you of a Caesarian section how? Surely the baby's not supposed to be put back?
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#206392 - 29/02/2004 10:53
Re: Supra engine rebuild
[Re: rob]
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msaeger
carpal tunnel
Registered: 23/09/2000
Posts: 2927
Loc: Minnetonka, MN
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That's too bad and to find out after doing all the work of removing the engine. Hopefully you can find a suitable one that isn't in as bad of shape.
Matt
Wii Wii Wii 
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#206393 - 29/02/2004 12:16
Re: Supra engine rebuild
[Re: rob]
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tfabris
carpal tunnel
Registered: 20/12/1999
Posts: 27652
Loc: Seattle, WA
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Very sorry to hear that, Rob.
On the bright side, you got to have a fun day (s?) with your friends digging into an engine.
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#206396 - 07/03/2004 21:34
Re: Supra engine rebuild
[Re: rob]
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pca
old hand
Registered: 20/07/1999
Posts: 881
Loc: UK
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Well, we're obviously getting better. It only took two people two days to reduce a finely crafted japanese machine to it's component parts this time, rather than three people three days last time. Possibly it would take one person one day, and with no people it would simply fall to pieces spontaneously
I managed to find a secondhand low-mileage engine via an online parts-search service, and after some humming and hawing Rob bought it and had it delivered to my house. Actually, he phoned and said it was coming in two to three days and that I would get an hour's notice by phone. What really happened, of course, is that the next day at 10AM there was a knock on the door and a large bloke with an even larger truck said "Where do you want it, mate?" This led to some frantic reshuffling of the workshop to find room for a pallet some four feet square and weighing about 600 pounds.
The description was of an imported japanese-spec engine before the first cam-belt change, which set an upper limit of about 60000 miles assuming the supplier was truthful and correct. After a certain amount of struggle involving a borrowed engine hoist and a packet of ginger-nut biscuits, we were able to get the thing onto the engine stand and start investigating it in detail.
There were a few cosmetic blemishes due to the way it had been delicately and carefully removed from the donor car with a hacksaw, but these proved to be of no real import. The first thing we noted is that both engine mounts were almost new, which immediately cheered Rob up as the one that died when we removed the original engine would have cost about £120 to replace.
The date code stamped on the block is more or less exactly what the other engine had, mid-1989, but I'd guess that the engine has been in storage for at least 13 of those 15 years. The thing turned out to be very low mileage indeed, if the condition of the innards is anything to go by. As a rough estimate, I'd say it's got no more than 20000 miles on it.
All the bearing surfaces are only just past the well-run-in stage, the valves after a quick wipe look like they just came out of a box on the shelf, the bores are immaculate, and the oil-ways and water channels in the head appear brand new. There is no sign at all of any blowthrough on the head or inlet and exhaust gaskets, and in fact all the gaskets simple lifted off the various surfaces like they'd been put on the week before.
Actually, dismantling this engine was a little surreal. The Haynes manuals, for instance, always say something like "Next, remove the nine bolts securing the whatsit to the gubbins, and remove the thingy", making it sound so easy a small dim child could do it. They always omit the stage of "Note the thingy will be immovably bonded by sheer neglect to the gubbins and will require a severe beating with a five-pound lump hammer before it comes off, which it will do in at least two pieces".
Not this time. Remove the crank pulley bolt (which admittedly did require an improvised 4-foot extension handle on the socket, that little sod was on TIGHT), and a gentle pull made the thing just slide off in the way they never do. The same story throughout, everything simply came to pieces with no real effort at all. The annoying thing is that we could probably have stuck the engine straight in the car and had a completely reliable setup as is 
All that work by some industrious japanese robot, wasted!
Oh well. Rob wanted a steel gasket no matter what, so it had to be done. The interesting thing is that the head bolts were torqued up to the revised setting, which means that the engine has seen some work after leaving the factory, probably into the care of one lady owner who only took it out on sundays and had it regularly serviced. 
The upshot of all this is that tomorrow I'm taking the various bits to the engineering company for a check, and collecting the other bits for a quick ride to the scrapyard. With a little luck the only things that will need to be done to the block and head is a polish to remove the old gasket material, since under that they seem to have virtually a mirror finish already. When it's reassembled the end result should be as solid as one is likely to get on an engine of that age.
We also stripped one of the turbos, and it seems in pretty good condition overall, so it can be cleaned and go back in the car. A reasonable weekends work, all in all.
Attached is a picture of Rob amongst the debris of the engine, looking pleased at the destruction he's wrought
pca
Experience is what you get just after it would have helped...
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#206398 - 07/03/2004 22:05
Re: Supra engine rebuild
[Re: pca]
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brendanhoar
enthusiast
Registered: 09/06/2003
Posts: 297
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My favorite part of that pic is the camshaft (?) DELICATELY TAPED TO THE TABLE LEG.
-brendan
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#206400 - 08/03/2004 11:29
Re: Supra engine rebuild
[Re: pca]
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loren
carpal tunnel
Registered: 23/08/2000
Posts: 3820
Loc: SLC, UT, USA
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Hahaha... i didn't notice that at first but damn that is hilarious for some reason.
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#206401 - 08/03/2004 20:14
Re: Supra engine rebuild
[Re: pca]
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tfabris
carpal tunnel
Registered: 20/12/1999
Posts: 27652
Loc: Seattle, WA
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and with no people it would simply fall to pieces spontaneously That made me laugh out loud, Patrick, thanks.
Great post, as always. Glad Rob's getting a good engine out of this whole deal. Best of luck to all of you getting it back together.
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