Question about 1983 Chevrolet Malibu

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Oil in the rad water but no water in the oil

Oil in the top of rad water but no water in the oil - In a 1966 SS396 Chevelle Chevy 396 CI (6.5L) big block - 375bhp version - when oil droped from sump clean and clear, have removed valve covers on top of heads clean and clear no white froth, oil that sits on top of rad is pure clean oil not white - will loose aprox 1/2 a pint in 20 minutes idling - no oil cooler or oil lines running to rad also 4 speed manual - flushed rad replace with fresh water will pick up oil again - no problems with compression at top end of manufacturers spec - oil 60 psi + when cold and 50 psi hot drops to 40 ish psi idling hot - water presure 70 psi when at operating tep. No over heating problems all temps within expected limits - Have had to replace cam (now Edelbrock) as cam used (Crane) on rebuild was soft and rounded of first 3 lobes at front of engine (for info this problem does apperar to have started after replacing cam and lifters) - Engine reputedly rebuild 1000 miles ago (for info I purchased car June and imported to UK from dealer in Clearwater he is equilly stumped over problem as are most of engine builders here in UK) - I have had sugestion that could be crack in cam valley but not aware of any water jackets in area also would expect if this the case water would get to sump which it is not doing - Engine starts, runs strong, does not burn oil, would not have noticed this if oil had not run out of rad expantion tank overflow due to the additional volume of fluid in water system - engine is not origingal numbers matching and understand it to be a 69 block - any sugestions much appreciated before I have to strip down engine to find problem.
Bob from Uckfield in England

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  • 79 Answers

I would say that there must be a small track between an oil channel and a water channel in a cylinder head gasket. The oil pressure is normally more than the water pressure, so the fluid transfer is one way - to the water system. The track will be very small, so flow will only occurs when oil pressure is above zero. It's all it can be, I think.

Posted on Sep 26, 2009


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Posted on Jan 02, 2017

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Thats a fun one. Had to do it on a 68 camaro. Basically from the middle of the car fish the back end over the axle until you can start the front towards the engines fuel pump. You should have gotten new retaining clips that snap or screw into the frame rails. The brake line is just as much fun.

Posted on Feb 01, 2010

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SOURCE: Wiring diagrams for ma 1966 chevelle

You can buy it here

Posted on Apr 04, 2010

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SOURCE: how to install clock in chevelle 1966

Replacements differ from one supplier to another. Get the name, etc. off the clock and contact them. I had to do the same thing for a '69 Corvette replacement clock.

Posted on May 02, 2010

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SOURCE: 68 chevelle 396 turns over,

could be the fuel pump if your car is cranking but not starting

Posted on May 23, 2011

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