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preping the block
- Thread starter JDM 1JZ
- Start date
dude if there is one thing i have learned, it is that there is never any reason to rush a job like this. "do it right or do it twice" (or 3 or 4 more times...)
my supra is my DD and i have been through three motors now. it sucks going without a car but thats the path that i chose.
the second you take sand paper to the block say good bye to having an even deck surface.
if you just want to slap a new head gasket in there, clean it off the right way, get a straight edge to check its straightness and use a stock composite head gasket.
if you want to use a metal head gasket, pull out that block, break it down and send it off to the machine shop.
my supra is my DD and i have been through three motors now. it sucks going without a car but thats the path that i chose.
the second you take sand paper to the block say good bye to having an even deck surface.
if you just want to slap a new head gasket in there, clean it off the right way, get a straight edge to check its straightness and use a stock composite head gasket.
if you want to use a metal head gasket, pull out that block, break it down and send it off to the machine shop.
i thought the cometics were good for high hp applications or i guess i was wrong?
and IJ what gasket where you suggesting cometic also?
so cometic is definately out of the qustion lagged?
and most def hks and them even though i wasnt going to use them
and IJ what gasket where you suggesting cometic also?
so cometic is definately out of the qustion lagged?
and most def hks and them even though i wasnt going to use them
Cometics are great but they're still an MLS MHG. (multi layer steel)
They're a little more forgiving on the surface RA but not a lot so still need a smooth flat surface.
I'm using a 3mm Cometic in my motor and it's fine.
They're a little more forgiving on the surface RA but not a lot so still need a smooth flat surface.
I'm using a 3mm Cometic in my motor and it's fine.
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NDBoost
Guest
everyone has different views on HG work. In the end the truth is, if you dont take your time and do the propper prep work for a MHG it wont seal properly and youll blow it again 1,000 or 2,000 miles down the road.
Same goes for any other type of HG, clean the block remove all the gasket material and put a cometic in there and torque it back down. Dont over heat it and you should be fine. as long as all material is scraped off and the block surface is level.
just keep in mind that if you DONT DECK THE BLOCK you WILL blow a MHG sooner or later under high boost.
Same goes for any other type of HG, clean the block remove all the gasket material and put a cometic in there and torque it back down. Dont over heat it and you should be fine. as long as all material is scraped off and the block surface is level.
just keep in mind that if you DONT DECK THE BLOCK you WILL blow a MHG sooner or later under high boost.
JDM: Yes I surfaced the Block and Head, the machine shop dinged the block when they had it there as it was brand new and very flat and smooth from Toyota I would have used it as is.
awesome this kinda sucks then, how hard is it to disasemble the block, pistons, crank, baring anything else im forgetting
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NDBoost
Guest
cant be that hard just undo the bolts holding the crank in, undo each rod cap make sure to keep all bearings upper and lower and rods in order.
yeah im just worried about it not going back together right, once its all out cant i re-ring the pistons and eveyrhing as well? what about the oil pump and everything does that all need to come out? i need to put a clutch in ayway i guess... i dunno i guess your right, just sucks the cars my daily driver... i guess i can finally fix that damn leaky oil pan and eveyrhting to....fuck me
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NDBoost
Guest
NDBoost said:hey, you dont have to do it the right way. you could get a stock hg and throw it in
yeah thats kind of a waste though
JDM 1JZ said:
a waste would be putting everything back together and STILL having a blown head gasket...
lagged said:
thats definately true, im probley jsut gonna park the car and pull it apart, thanks everyone for your help as usuall and fast answers and of course knocking sense into my hard head
i did mine with a 2 inch thick peice of surface glass, and 6 different grades of grinding compound, to a mirror finish (clover grinding compounds are the best, but spendy :O )
ive got over 6k miles on it since, but i also totaly pulled the engine down to nothing (including removing the piston oil sprayers.)
i also debured every inch of the block ect..
also a word on surfacing the head. Ive noticed no one has even mentioned the fact the head must be done as if it was torqued to the block, you cant just go "surfacing" the head. just because the head is a bit warped off the block, doesnt mean it will be on the block. if you just go having someone surface the head there is a possibility your cam saddles will be warped when you bolt them back in, causing cam bind......
the is ALOT more to properly building the engine than just "sending it off to the machine shop" unless they are very informed on long aluminum heads with OHC....
i do everything myself, then i have no one to blame if it goes wrong but myself... and im very picky
ive got over 6k miles on it since, but i also totaly pulled the engine down to nothing (including removing the piston oil sprayers.)
i also debured every inch of the block ect..
also a word on surfacing the head. Ive noticed no one has even mentioned the fact the head must be done as if it was torqued to the block, you cant just go "surfacing" the head. just because the head is a bit warped off the block, doesnt mean it will be on the block. if you just go having someone surface the head there is a possibility your cam saddles will be warped when you bolt them back in, causing cam bind......
the is ALOT more to properly building the engine than just "sending it off to the machine shop" unless they are very informed on long aluminum heads with OHC....
i do everything myself, then i have no one to blame if it goes wrong but myself... and im very picky
if the machine shop doing the job dosnt know to check the warpage of the entire head... then they wouldnt be the machine shop doing the job...
most dont, they just check the surface.
and just because it is warped off the block, doesnt mean it will be on the block.
and just because it is warped off the block, doesnt mean it will be on the block.
"i do everything myself, then i have no one to blame if it goes wrong but myself... and im very picky"
i like this guy he thinks just like me
i like this guy he thinks just like me
IJ, just for clarification:IJ. said:
Are you saying that it is okay, to use the brake quiet on a composite hg?