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Leaking cam seal  Rate Topic 
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 Posted: 05-12-2016 03:59 pm
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Earthscrew
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Like others, I have been hunting down oil leaks, which has become a hobby at this point.

I changed the new tower cover gaskets that I just had installed when the engine was rebuilt not even a year ago with new gaskets which appears to have worked, for the moment.

Then found that the cam seals were leaking, changed those, which lasted about 30 days. Then I realized that the Allen screw in the end of the cam was also leaking, removed the cam gear and reset the Allen screw with some 515 sealant.

Jacked the car up, started the car and laid under there for 30 minutes with a flashlight looking for leaks, not a one. Happy day!

Celebrated my victory over oil with a great gin martini, then went to bed.

But, the next morning there was a small puddle on the floor, what the heck!

Crawled under again with the engine running for about 20 minutes, nothing, not a new drop.

Then so had my wife turn off the engine, instantly a small stream of oil poured out the bottom of the cam seal, ran down the lower radiator hose and onto my forehead,

Would anyone out in Jensenville know why it only leaks when I turn it off??!

Driving me nuts

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 Posted: 05-12-2016 04:32 pm
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subwoofer
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It doesn't leak, it marks territory..,

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 Posted: 05-12-2016 05:00 pm
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Earthscrew
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I actually decided to simply give in to the idea that the car will allways leak, that it is designed to leak and that everyone expects it to leak, so it best leak.

However, I wrapped one of my sweat bands around the radiator hose to intercept the oil stream so nothing pisses on the garage floor.

Guess I will simply change it once a month and worry about something else!

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 Posted: 05-13-2016 02:02 pm
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Brett Gibson JH5 20497
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Is it the seal or is it coming out the pulley bolt, if it's the bolt, undo it and put some RTV on the threads, then re-tighten to 55 Ftlb.

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 Posted: 05-13-2016 03:50 pm
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Earthscrew
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Brett,

I have tried the sealant on both the Allen screw in the end of the cam as well as on the bolt which secured the cam gear on two occasions in the last two weeks. As indicated, the car does not appear to leak when it is running, but the second you shut it down, a stream of oil dumps out from around the new cam seal I just installed. Only leaks from the exhaust cam due to the engine sitting at 45 degrees, I assume.

Frustrating beyond belief.

I do thank you for your assistance!

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 Posted: 05-13-2016 05:15 pm
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Frank Schwartz
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Are you sure the cam cover gasket is not the culprit?? They are infamous for leaking oil. Try putting a piece of cardboard up under the exhaust cam cover and see if it is leaking there...

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 Posted: 05-13-2016 05:32 pm
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Earthscrew
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Thank you for the input, but I have replaced the cam cover gasket twice as well. I first used the silicon type, no luck with that one, then tried the black rubber type which has stopped the l;eak from the bottom of the cover.

I actually went so far as buying a video scope from Harbor Freight so that I could see under and around.

So far, it remains that the car dos not leak until the very second AI turn it off.

Again, I am beginning to think that i have to live with it like it or not!

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 Posted: 05-14-2016 11:47 am
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gmgiltd
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Other possible causes depending on whether you are still using the standard airbox which is plumbed into the exhaust cam box and creates a slight vacuum when the engine is running. If you are using K&N type filters where is the breather run to? Are there any restrictions or has a PO put a PCV valve in the line?
Gordon

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 Posted: 05-14-2016 05:43 pm
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Earthscrew
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I am running the original air box, as I did not care for the "sucking" noise that most small aftermarket system make.

Should I try plugging the breather hole in the cam box, or would that simply
cause it to leak all the time?

Thank you !

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 Posted: 05-14-2016 06:31 pm
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gmgiltd
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It's a long shot but make sure the breather hose from the cambox is not restricted or kinked.

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 Posted: 05-14-2016 06:46 pm
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Earthscrew
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No kinks or restrictions I can see. Does the breather serve any purpose other then directing crankcase fumes back into the engine? I would like to try plugging it because I have exhausted all other options.

Regards

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 Posted: 05-14-2016 07:22 pm
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gmgiltd
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Plugging it would be a retrograde step as the breathers in the cambox and crankcase both prevent pressure building up internally. You may just have a damaged or defective cam seal, although why it would only leak with the engine off is a mystery - I would suggest that is the main suspect.
Gordon

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 Posted: 05-14-2016 08:24 pm
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Earthscrew
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I wish you were right, but have replaced the cam seals last year when engine was rebuilt, and again 4 weeks ago when I replaced the cam gears.

I am lost as to what to try next

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 Posted: 05-15-2016 06:48 am
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Tim Murphy
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There was a special tool designed for the cam seal install. I was told that it was very important to apply even pressure to the cam seal when installing. As I remember, the mechanic used a very large socket which rested on the metal part of the seal and tapped it in very gently. Hope this helps.

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 Posted: 05-15-2016 10:06 pm
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Earthscrew
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I used a perfectly matched socket in both attempts, I am beginning to wonder about the fit of the seals I have bought

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 Posted: 06-09-2016 09:43 pm
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Earthscrew
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Finally resolved the cam seal leak. I took the car to my Jensen mechanic in Moorpark. Kevin pulled the cam gears and seals and found very small scratches and what appeared to be a groove on both cams if you looked real close.

He made sure the front oil galley drain was clear, installed a set of Speedi-Sleeves on the cams, new seals and that was the end of the leaks.

It really does pay to simply take it to an expert right up front.

Hope this helps someone else solve their leaks!

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