Rough block deck...

connormcd88MKIII · 04-05-2010, 06:30 AM

I was losing coolant... Heres also a picture of the old head gasket. And if I were to get it resurfaced to correct the pitting, would I need to make any modifications to the pistons, rods, bearings etc., to account for the loss of the material for the block?

MA70-3.0GT · 04-08-2010, 03:58 PM

Sorry to say this, but as far as I can tell from the pic what appears to have happened is the previous HG (guessing it was done fairly recently) went in the same area & somebody was a bit over zealous with the cleanup of the affected area. TBH it looks from the photo as if it's been hit with fairly heavy sandpaper or wire wool... And then the resulting block warpage has given the effect we see here with the next HG.

I'd have to agree with cre that machining is the only sure way to make sure it's within warpage tolerance, the head may also need skimming now if that's in a similar state. As to modifications after a skim, it depends on how much material is removed & I can't think of the specs off hand but it's in the tsrm anyway & if both head & block come within the tolerances after skimming then you don't need to do a thing.

However if (as usual, as the factory tolerances are tight-ish) there is too much material gone for a stock HG you can go for a thicker metal HG to take up the difference, you'll need to look into head/deck finishes for that route though as they have to be mirror like... IMO best have the pair finished to MHG surface roughness specs from the get go & then if you find you can get away with a stock item (if you really wanna by then!) fair enough, but if not you're not stuck then with running back to the machine shop for more sessions & more material/not to mention cash, lost...

connormcd88MKIII · 05-23-2010, 04:28 PM

So I finally finished working yesterday and it was time to attempt to start it. It started up after only a couple of seconds and it seemed fine. Then I noticed a a bit of white smoke coming from where the exhaust manifold meets the exhaust. Any ideas on what may be the problem?

Green7mgte · 05-24-2010, 02:09 AM

did you strip any of the exhaust bolts?

04-05-2010, 06:30 AM	#1
connormcd88MKIII Stock Join Date: Mar 2010 Location: Mineola, NY Posts: 5	I was losing coolant... Heres also a picture of the old head gasket. And if I were to get it resurfaced to correct the pitting, would I need to make any modifications to the pistons, rods, bearings etc., to account for the loss of the material for the block? Attached Thumbnails Last edited by connormcd88MKIII; 04-05-2010 at 10:18 PM.

04-08-2010, 03:58 PM	#2
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Sorry to say this, but as far as I can tell from the pic what appears to have happened is the previous HG (guessing it was done fairly recently) went in the same area & somebody was a bit over zealous with the cleanup of the affected area. TBH it looks from the photo as if it's been hit with fairly heavy sandpaper or wire wool... And then the resulting block warpage has given the effect we see here with the next HG. I'd have to agree with cre that machining is the only sure way to make sure it's within warpage tolerance, the head may also need skimming now if that's in a similar state. As to modifications after a skim, it depends on how much material is removed & I can't think of the specs off hand but it's in the tsrm anyway & if both head & block come within the tolerances after skimming then you don't need to do a thing. However if (as usual, as the factory tolerances are tight-ish) there is too much material gone for a stock HG you can go for a thicker metal HG to take up the difference, you'll need to look into head/deck finishes for that route though as they have to be mirror like... IMO best have the pair finished to MHG surface roughness specs from the get go & then if you find you can get away with a stock item (if you really wanna by then!) fair enough, but if not you're not stuck then with running back to the machine shop for more sessions & more material/not to mention cash, lost... __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

05-23-2010, 04:28 PM	#3
connormcd88MKIII Stock Join Date: Mar 2010 Location: Mineola, NY Posts: 5	starting it up So I finally finished working yesterday and it was time to attempt to start it. It started up after only a couple of seconds and it seemed fine. Then I noticed a a bit of white smoke coming from where the exhaust manifold meets the exhaust. Any ideas on what may be the problem?

05-24-2010, 02:09 AM	#4
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	did you strip any of the exhaust bolts? __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

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