Water jackets
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Idol
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Im in the process of doing my head on the m20b25, I have noticed some pitting on the block which I'm trying to remove with an oil stone. My question is, in the picture below what water jackets are used is it the ones above the bore or below or both? I'm not sure as I know the turbo boys weld them up on the heads, so this suggests to me that a set ain't used? I don't want to spend ages oil stoning if the water dont pass these jackets, therefore no chance of water seeping beneath the gasket!
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Idol
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As in the 2 exhaust side and 2 inlet side (pic went wrong way)
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maggspower
- Turbo Farmer Tractor Driver
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Right, first of all stop "oil stoning" the block, if theres any thing that will stop a head gasket sealing its a non flat sealing face. A good sharp scraper is best. Cast iron is tough stuff so it will probably be ok, there are oilways running from block to head, unless you have sealed them the crap you are "oil stoning" off will be entering these ways. That block is more than clean enough for a new head gasket.
All the water jacket holes are used. If you look at the head the waterways are crescent shaped around the combustion chamber, some turbo builders have got these partialy welded up then skimmed flat with the rest of the head. It ends up looking like the water ways on the block, this is done to provide the gasket more grip as it is clamped over a larger surface area. in my opinion the effects are marginal, MLS gasket is better.
HTH
All the water jacket holes are used. If you look at the head the waterways are crescent shaped around the combustion chamber, some turbo builders have got these partialy welded up then skimmed flat with the rest of the head. It ends up looking like the water ways on the block, this is done to provide the gasket more grip as it is clamped over a larger surface area. in my opinion the effects are marginal, MLS gasket is better.
HTH
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Idol
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Cool, I was just worried a out water seeping where there is some pitted marks? The oil stone is dead flat and people in my work use them on machined faces of pumps etc, so I can't see it doing any damage if it's worked across the whole of the block, it takes the tiny tiniest amount of material away. I can understand your point about the oil ways tho.
So do you think it would be ok to fit gasket? Should I uses smear of hylamar on both faces?
Do you think it good enough to take some <10psi boost with arp's at a later date?
So do you think it would be ok to fit gasket? Should I uses smear of hylamar on both faces?
Do you think it good enough to take some <10psi boost with arp's at a later date?
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maggspower
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No instant gasket! When you see an engine with bits of bright coloured goo coming out of the sealing faces does it inspire confidence? 
People run these at 1 bar with standard internals, I'm not saying no one has problems though. IMO the bottom end should be rebuilt if it is going to be boosted.
People run these at 1 bar with standard internals, I'm not saying no one has problems though. IMO the bottom end should be rebuilt if it is going to be boosted.
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Idol
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I mean hylamar and gasket .....no?