Cascade Crew

aaron_sK

Found a little milkshake foam under the radiator cap in the Monterey. Checked the oil and trans fluid and both were clean. Bypassed the radiator trans cooler (ran it straight through the auxiliary) and changed the oil.

Drove it maybe 15 miles and there is noticably more oil in the coolant, however still no water in the crankcase.

She's gonna have to come back apart either way (once the weather cools down, triple digits suck). However I am curious as this is the first water/oil swap I've ever had that didn't go both ways. Could it be due to the high oil pump pressure (35-90 psi with RP 15-40)?

Twilightoptics · Posted: Tue Jul 28, 2009 6:30 am Post subject:

It'll go both ways at some point.

Don't think a HV pump would do it. Sounds like a blown head gasket, cracked block.

aaron_sK · Posted: Tue Jul 28, 2009 8:34 am Post subject:

I've got my fingers crossed for a gasket problem, Paul. Gonna have to come apart either way.

Sux... No no no...

kurfbird · Posted: Tue Jul 28, 2009 1:31 pm Post subject: head gasket

Yes sounds like a head gasket.

I have them blown with just bubbling in the overflow. No water in the oil or oil in the water.

Good luck

izcain · Posted: Tue Jul 28, 2009 8:04 pm Post subject:

seen them wic up thru the head studs. Are you running studs or bolts?

Twilightoptics · Posted: Tue Jul 28, 2009 8:16 pm Post subject:

chevymad · Posted: Tue Jul 28, 2009 8:42 pm Post subject:

Oil in the radiator means a pressurized oil passage is near a water passage. Thats the only way oil can go against the 14psi of water pressure in the radiator.

Is there pressurized oil in the heads on this motor? Or does all the oil come up the pushrods? I know on a chevy the pushrods are the feed so there is no way for a head gasket to cause oil the water.

aaron_sK · Posted: Tue Jul 28, 2009 8:59 pm Post subject:

@ Zach - Just stock-style bolts.

@ Brandon - No oil through the pushrods at all. Solid rods with shaft-mount rockers. IIRC (been awhile since I primed it) oil comes up around the bolts that hold the shaft assembly to the head.

chevymad · Posted: Wed Jul 29, 2009 6:37 am Post subject:

Ah so very possible for a bad head gasket to do this.. lucky.