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Old 12-27-2012, 08:04 AM
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472 Oil Leak ?

I put some UV dye into my crankcase and drove around for a day to allow it to circulate. Then I allowed the car to sit another day. I jacked the car up high and went under with the UV light. It appears that the lower part of the oil pan was covered with oil but the pan gaskets themselves were fine. The drain plug was ok as well. The oil also was closer to the rear of the engine and covered part of the lower bell housing cover. I'm thinking rear oil seal here - right or wrong ? But heres the thing - wouldn't the tranny be wet as well since the oil would fly to the rear as the car is moving ?

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Old 12-27-2012, 08:14 AM
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472 talldeck mouse stroker? and what kind of pan?
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Old 12-27-2012, 09:36 AM
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472 Caddy with a stock pan
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Old 12-27-2012, 12:39 PM
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Quote:
Originally Posted by Coodeville View Post
472 Caddy with a stock pan
What about timing cover and front seal. Usally oil moves towards the back of the car. Any holes in the pan. Also pan may be dripping and just only hitting the bottom area. Head gaskets can also leak.

Have you tried to tighten the oil pan bolts a little just put a socket on them and make sure they are tight?

Fan can be blowing the oil back form the front of the engine. Front intake gasket could end up leavong oil on the pan once it rolls down and is blown backwards by the fan.

I would get the engine steam cleaned by a local shop. Many used car shops clean the engines with the steam cleaner. Once its clean the oil will be easy to spot coming out of the engine. Some times alarge peice of paper will show what side the oil is coiming from just by leaving it under the car at night. And might help find the real cause.

Dont look for the most oil look where oil is high or forward than any other. That will lead you to the leak. My caddy had front seal leaking it was the two bolts on each side of the seal were just loose. I could turn them with my fingers. Once tight it was mostly sealed.
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Old 12-27-2012, 01:08 PM
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It should be the rear seal. Caddy used a "gasket" made of rope. Had the same thing on my 66 eldo.
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Old 12-27-2012, 01:56 PM
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Cadillac went to a two piece rubber rear main seal on the 472. Was a big deal back when I wrenched for Cadillac dealer right out of hi school. You could put a rope seal in, but the dealer replacement is neopreme rubber.
http://www.summitracing.com/parts/fel-bs40012
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Old 12-29-2012, 03:10 PM
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The pan gasket itself is dry along with everything above it except in the rear. Timing chain cover and front oil seal are dry as well. I'm thinking it myst be that rear seal...
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