LS3 Motor oil leak - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 1 (permalink) Old Nov 5th, 11, 08:35 PM Thread Starter
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Join Date: Jul 2003
Location: Spring Texas
Posts: 5,580
LS3 Motor oil leak

I am working on a 69 camaro with LS3 motor. It has a oil leak by the back of the oil pan. Took the trans out and started motor. Noticed a little sepage out the rear main seal.

Went to take the flywheel back off and pressure came out when I took out one of the flywheel bolts. Dont know how this could happen. Looked in each hole with a mirror. They should just be tapped into the crank end.

Started the motor again checking for leaks and when I took the oil fill cap off the motor had pressure in it.

So started looking at my Suburban 6.0 motor and saw it had a vent on the driver valve cover. This motor had a cap over the tube so I put a hose from the valve cover to the back of the carb. Oh yea it is a LS3 Carb motor.

So my thinking is the motor had pressure in it due to the vent out the valve cover wasnt hooked to vacuum and the pressure made the oil leak out the rear seal.

The first time we started the motor it had about a 6 inch spot in about 10 minutes and now it is a small drip.

I just changed the rear main seal and havent put the trans back in it. I will start it tomorrow and check for leaks before I put the trans back in.

Does that sound right because the motor has oil pressure in the oil pan which could effect the rear seal also.

69 Camaro Prostreet - purple w/ghost flames , 502 w/ 871 blower

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