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DropTheClutch

MLS gasket mixing water with oil?

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So this rb25det s15 project has been a headache to say the least! 

Long story short the engine sustained some damage due to the cambelt snapping causing 2 valves to snap in the 3rd cyclinder (Luckily no damage to the piston or bore) right ill just buy another second hand head, skim it and slap it on i thought...

I brought a 1.3mm cometic MLS gasket, ARP headstuds for the installation. Cleaned the remaining gasket off the block and used a paint scraper along with a scotch brite pad to remove the old gasket but did not check the block for flatness 🤔🙄

After getting everything torqued up properly in the sequence 20,40,60,80 ft/lbs and bolting the manifolds back on etc.

After running the engine for around 5mins i noticed alot of steam coming out from the rocker cover breathers and yeppp a gravy like substance underneath the oil cap..

So im assuming the gasket didn't seal properly between a water and oil gallary.

Can someone confirm?

This is freakin depressing 🙁

 

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Not the first time this has happened and it sounds like you know exactly whats happened - Generally comes down to surface prep when using a metal gasket.

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There is specific surface finish required for the MLS and I'm guessing rubbing back with a scotchbrite pad is probably not enough

Out of curiosity, did you use water or coolant?

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Its also wise to use copper spray on the gasket, especially when the surfaces haven't been finished to the required spec. Pretty impossible to do on the block deck unless motor is being rebuilt.

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I only used water in the radiator just to get the engine running.

Im pretty sure this is not just residue water that could of got into the oil passages.

What do u guys reckon i should do from here. Im thinking of taking the head off again and using a stock gasket with copper spray and hopefully it will seal with the current roughness of the block. Don't really want to take the engine out of car to get the block skimmed..

Cheers for the replys

Edited by DropTheClutch

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5 hours ago, GTSBoy said:

Thats' about your only option.

To deck the block? Do u think it will seal with a stock gasket

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No, I meant stock gasket with a spray, and suck it & see.  If that doesn't work, then you're going to have to pull it all apart.  But if it does work, you're no worse off, in fact a lot better off than you are now.

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If your head and block has not been machined then it won't seal.

Cometic HG, although a pain in the arse to get right are actually very good. Just wrong application in a slapper job.

You need a Tomei o-ring head gasket or a Nitto one if your block hasn't been machined.

 

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