Oil Leaking after Cam Change

[vtarandy]

I just finished putting an EV-27, Crane quick change chromoly pushrods, new pushrod tubes and o-rings in my '93 Evo. A mile test ride produced oil leaks from the top o-rings. Replaced the o-rings and ran it a mile without the breather / air cleaner - no leaks. Put the breather / filter back on, it's an SE 29543-99B. The oil leak is now worse. I can blow air through the breather tube. The only thing I can think of is I might have the washers for the breather on the wrong side. I have it big hollow breather bolt, washer, breather backing plate, washer, breather tube. This set up ran fine before the cam change. I have looked everywhere for someone with this problem but cannot find anything.

[gsxrboy96]

Originally Posted by vtarandy

I just finished putting an EV-27, Crane quick change chromoly pushrods, new pushrod tubes and o-rings in my '93 Evo. A mile test ride produced oil leaks from the top o-rings. Replaced the o-rings and ran it a mile without the breather / air cleaner - no leaks. Put the breather / filter back on, it's an SE 29543-99B. The oil leak is now worse. I can blow air through the breather tube. The only thing I can think of is I might have the washers for the breather on the wrong side. I have it big hollow breather bolt, washer, breather backing plate, washer, breather tube. This set up ran fine before the cam change. I have looked everywhere for someone with this problem but cannot find anything.

Im not real familiar with your air cleaner backing plate, as all i run is arlen ness backing plates, but i can tell you on my s and s, i had to run a nylon washer before and after the backing plate to get the leak to stop completely, hope that helps.

[Dave63]

Originally Posted by vtarandy

I just finished putting an EV-27, Crane quick change chromoly pushrods, new pushrod tubes and o-rings in my '93 Evo. A mile test ride produced oil leaks from the top o-rings. Replaced the o-rings and ran it a mile without the breather / air cleaner - no leaks. Put the breather / filter back on, it's an SE 29543-99B. The oil leak is now worse. I can blow air through the breather tube. The only thing I can think of is I might have the washers for the breather on the wrong side. I have it big hollow breather bolt, washer, breather backing plate, washer, breather tube. This set up ran fine before the cam change. I have looked everywhere for someone with this problem but cannot find anything.

The O-rings should be one of the last places I'd expect a leak due to poor ventilation, unless you don't have the tubes seated correctly. Mine have the rubber o-ring on the end of the tube, then a thin metal washer, between the o-ring and the head.

Recheck your top pushrod tube o-rings. Take the tube and spin it a little, making sure it seats in the head. I just did a cam swap on my 1995 and I had a leak as well on the front tube. A soon as I took the retaining plate off and touched a screw driver to the upper lip, *plop* in fit right in, and the leak was gone.

I'm not feelin' it's related to your air cleaner/filter at all.....

Silly Q, but you're good on the breather gear alignment?

[vtarandy]

Thanks for the help. Would a mis-aligned breather gear cause this? I've had the tubes off twice now. I'll try the twist technique and if that fails I'll pull the gear case and re-check everything. Thanks again for the help.