supra head gasket questions+ rebuild

[supramacist]

You need to take some pics of what you have going on man.
I don't want you making any major mistakes and if you aren't hitting the block in equal proportions. You're bound for trouble..

Use the feeler gauges and the level. Sand as hard as you want as long as you do it even. You can't skip big slots in sandpaper grade.

You have to start heavy and go lighter, lighter and lighter still.

I spent 3 weeks lapping my block, because I'm so anal. You just got started. If you're trying to sand blemished areas, all you are doing is digging after those areas making your total trip much further than it has to be.

Sand the block till it's smooth and then smoother and smoother.
If you take your time and stop rushing you'll see just what I mean.

[Andy C]

hey t.ortlieb, just to let you know skimming the head does not remove the warpage if you head is warped skimming wont help this just provides a flat smooth finish for the gasket to seal, if my head was warped id buy ia new one.

hey supramacist in just about to do some more lapping ill post some pictures of me lapping the block so you can see what im doing and if im doing it right etc.

are you saying now ive started with 1200 grit paper i shouldnt now chage to a rougher paper to speed things up.

im using a stock gasket with arp studs to seal the head dont trust mhg on my block dont think i can get it clean enough for a metal one.

Q> when i undo the crank bolt and remove the pulley wont i lose my tdc positon???? confused , will i have to set the tdc by eye then replace the Pulley to 0. thnaks suprmacist your being a great help.

just for your info mate, the head is having a skim, a clean a new o ring in the cam position sensor and a couple of helicoils in the exhaust side.
the guy reckons if the engine was running sweet before not to touch the valves etc as this can wear out the bottom end, and to ba honest i have heard laot about rod knocking after a head gasket replacement and nobody needs this, thats a engine removal job, not for the faint hearted me thinks.

[Andy C]

thought id pop back in for a coffee, phew lap lap lap.

ive just started doing the block with a piece of wood that cover a good area of the block, 1200 paper and some 10/40 oil, surely i cant wear dawn areas onthe block with this method.

[Andy C]

well theres a little bit of sun now so puhed the car out of garage.
heres some more block pictures after about 4 hours in total.

[Andy C]

found a mior indetation looks worse in photo. the other gasket never blew in this area. what you guys reckon?

[Andy C]

was worried about the crank nut started jamming a pry bar in the flywheel area to try and break the nut tension, didnt trust the teeth so left that and tried the starter method, i connected the battery went to turn the car over and nothing happened no power dont know whay would of thought the starter motor would of turned???? any ideas.

Any ended up bypassing the starter motor directly from the battery instead,
put bar on the nut and and turned car over, only for a second it was enough to realease the nut, worked a treat.

pulley just slid of too. removed bottom cover and cleaned as it was caked with fibres from the 20 year old belt.

just waiting for parts and the head now to start rebuilding.

decat downpipe
and wastegate shimming to do.

i dont know what to expect power wise from this car, when i first got it a few weeks ago the turbo read .6psi had a blown head and blown turbo gasket. so with all this done and the extras, im hoping for a good increase in power what you guys reckon on the bhp ??

[supramacist]

You got soooooooo lucky dude.
You must have had someone owning it that took care of it instead of driving it into the ground. Good Work.