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Leaking Coolant From New Tomei Head Gasket

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By zoom,
in Engines & Forced Induction

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zoom Community Regular

zoom

Posted
Posted

Guys,

Just got my rebuilt engine back from my machanic mate. After put evrything together, I have noticed coolant leaking out between tomei head gasket and the bottom block, on the driver side. Spoken to the mechanic said that it could be the head gasket faulty. He told me that head studs were tighten to about 87Nm. Note that the block and head have all machined. Any idea why is it leaking even before any pressure?

Thanks

zoom Community Regular

zoom

Posted
  • Author
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Simon – what is the size of the studs? On ARP website, they recommend 62ft-bls (84Nm) for 10mm and 80ft-bls (108Nm). Hopefully under tightening is the cause. J.

It is only leaking on the driver side HG/block.

Jez –

Used Nissan gaskets kits and Tomei head gasket.

ARP main and head studs/bolts.

Pretty sure it is not coming out of the inlet manifold. I can see the coolant between the head gasket and the bottom block, along the block.

Is there any chance of faulty head gasket, block not machine properly?

boostn0199 Grand Master

boostn0199

Posted
Posted

Was it tightentend in stages? From the way you wrote about 87 i would intepret that as not much care taken. Could be any one of those in correct tightening procedure, poor machining , faulty gasket allthough i wouldnt put that as very likely espicialy with the tomei ones as they are not as sensitive to surface flatness levels as other metal ones.

zoom Community Regular

zoom

Posted
  • Author
Posted

Simon – what is the size of the studs? On ARP website, they recommend 62ft-bls (84Nm) for 10mm and 80ft-bls (108Nm). Hopefully under tightening is the cause. J.

It is only leaking on the driver side HG/block.

Used Nissan gaskets kits and Tomei head gasket.

ARP main and head studs/bolts.

Pretty sure it is not coming out of the inlet manifold. I can see the coolant between the head gasket and the bottom block, along the block.

Is there any chance of faulty head gasket, block not machine properly?

zoom Community Regular

zoom

Posted
  • Author
Posted

sorry double posted.

yes, it was tigthened in stages, followed the Nissan manual.

i personally don't think it is the HG faulty as you've said, This leaves the machining and tightening. Can anyone confirm the torque for the ARP head stud, hopefully they are under tightening, that ways i can just tightening it up to the required spec. Note the leaks is very little, even after puting about 14psi in the system.

boostn0199 Grand Master

boostn0199

Posted
Posted

The machining would really really average if a tomei head gasket is leaking on it as they tolerate pretty much same surface finish as the stock headgasket. Should always use a straight edge on head and block before putting on the gasket just to double check.

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