I'm gonna try to keep this simple. My bike is a stock 1988 Heritage Softail. After sitting for a couple months I went to start it and it blew oil out of the vent under the engine. It wasn't that much. It ran fine. so I decided to check the primary oil. When I loosened the derby cover oil came gushing out. It was way too full. I know for a fact that the last time I filled the primary the oil was just below the derby opening. So then I checked the engine oil and the tank is empty. The only way I can see this happening is if the seal behind the stator is leaking really bad. Or is there something I'm missing? Thanks in advance.....

 

The stator shaft seal, is the seal behind stator. My guess that is leaking. There were also some year evos that had casting problems in the block. Never had one, but buddies told me about them.

Not an evo guy buy they will drain down, and blow some oil out, if parked for a long time. I am sure an evo person can talk about that better.

 

Your theory of that seal could be the only way but pretty freaky and new for me.

Nothing hurt, but a must fix if it is going to sit for a while.

My old shovels love to puke after sitting a good while.

YA may already know this below but both are actually easier than replacing the seal, which truly isn't hurting anything other than what it did. Sure it needs fixed eventually but below may help.

There is an old school "fix" where you take a drift (brass would be good) and hammer and hit the check ball once firmly then replace the ball. This is suppose to seat the ball. I never cared much for working on my oil pump with a hammer.

Check ball measures .375" (3/8" Bearing).

An EVO pushrod has a round ball end that can be used as a lapping tool.

The ball end also measures .375"

Place the pump body in a vice with the top up. The vice will need some sort of soft jaws to protect the oil pump body along with a soft towel. Only tighten the vice enough to hold the part, do not damage the pump surfaces.

Use some fine grit compound that would be used for lapping valves.

Coat the end of the pushrod with the lapping compound. You don't want an excessive amount, but it should be coated fairly well.

Place the pushrod into the pump body and rotate.

Place one hand on each side, move them back and forth. After 3 or 4 swipes, lift the pushrod a little and set it back down and do 3 or 4 more. Repeat this 4 or 5 times.

Remove the pushrod and wipe the lapping compound off the end. Look closely at the wear pattern. You want an even wear pattern, so you know you are getting the entire check ball seat.

Clean the lapping compound out of the oil pump body and inspect the seat. If you are unsure of the seat, you can use a blue dye to mark the seat and repeat the process. Then, when you clean it out, you should be able to clearly see the condition of the seat.

Have a friend who's 2012 twincam leaks down after a while but it puts it back into the oil tank. 1st time he added oil before starting and oil was leaking all over bike and road. We had to pull oil out of tank.

 

Thanks Rounders and Bayou, The procedure for sealing the check ball sounds really great. I was going to keep this simple but I guess that's not always possible. I do have the inner primary off. Reason is when I bought the bike unbeknownst to me the inner primary had a hole in it that was covered very expertly with aluminum tape and epoxy. I found a primary case on Ebay and am waiting for it. The seal at the stator looks fine. I can't understand how oil leaked somehow into the primary. Since I have it this far apart I guess I will replace the seal and maybe the spacer if it has a groove in it. And I won't let it sit so long without running it. If anyone else has any other ideas please let me know. I would hate to get it all back together just to find out I missed something. Thanks for all the help.

 

Might be overkill but I was always told to replace the seal AND the spacer at the same time.

https://www.hdforums.com/forum/evo/1...nd-spacer.html

 

I just went through this, hope yours is just a seal but this year Evo did this.
https://www.hdforums.com/forum/evo/1...motor-oil.html

 

I think lentuk gots it... No way the Oil pump check ball lets Oil into Primary...

 

It is either leaking at the sprocket shaft seal/spacer, or the bearing race has come loose in the crankcase (this is one of the years that this was an issue).

This is not an oil pump issue.

 

Crankcase has very little oil in it ever, in running or not running condition
While not running a small amount of oil leaks pass the checkball in the oil pump. Longer it sits the more oil leaks into the crankcase.
Then this overage of oil in crankcase is what transferered into the primary.
If checkball was not leaking, he would not have lost the oil in his tank, which went thru the crankcase and then transferred into the primary via the mainshaft seal.

I have a 62 pan and shop full of shovels amongst others.

I will not start any of them in my shop, if they have been sitting very long as the crankcase vent will puke it out onto my floor. (Some sitting for years)

From time to time people will kick one of my old bike over and spit oil onto the shop floor.

it is what it is as I call it self preservation of my flywheel/rod bearings.

 

That is what I believe also... No Matter how much oil gets into the Crankcase...nor How...it should Not get past the Crank seal..Ever... unless something is terribly Wrong...