View Full Version : Help Shovelhead motor sprocket seal leak....!?!?

12-11-2012, 12:42 AM
I have a 1980 shovelhead belt drive open primary...my motor seal will not stop leaking oil I've tried hanging seals, tried turning seals backwards, even changed the bushing the seal rides on... I also checked my oil pump, timing etc.. does anyone have any other options for me?

12-11-2012, 4:12 AM
Have you checked the breather? Sounds like you are getting excessive pressure in yer case?

You don't by any chance have a filter on the end of yer breather hose, do ya? That can get dirty and clogged creating back pressure in the cases.

BTW, the spring on the seal should face the fluid yer trying to keep in. Open primary - spring inwards.

12-11-2012, 11:14 PM
Yes I do ill take the filter off and clean it... thanks

12-12-2012, 3:29 AM
Like shacknasty said it sounds like a pressure problem. If you replaced the seal and the spacer. And you put the seal in even and didnt damage it and the breather hose is not cloged. But your still pissing oil . I would check and see if you have a bunch of endplay in your sprocket shaft. How many miles does the bottom end have on it?

12-12-2012, 3:34 AM
Also where the metal part of the seal meets the engine case is there any damage or deep scrapes to the case that the oil is finding its way out of? You could try to use some sealant before you put the seal in. I have heard of guys doing that. Those years are notrious for leaking from that area !

12-12-2012, 4:56 AM
The surface the seal rides on isn't worn out but I have not checked end play...I just heard that running a oil cooler may help??

12-12-2012, 7:45 AM
Get rid of that filter on your breather hose!

12-12-2012, 10:14 AM
^^^^+2^^^^ on that. All they do is cause problems and don't do any good.


12-12-2012, 1:39 PM
Yup! Take that filter off the breather and throw it away. Point the hose down at the road or towards yer drive chain (if ya have one!) and don't give it a second thought. You don't want anything restricting the movement of air in and out of yer motor.

How about a pic of yer motorsickle for us helpin' out? We likes our Shovelhead porn!

Life is short and brutal. Ride hard, mofo...