Crankcase breather questions

[Rugby_fxdwg]

Is this a softtail? Is the oil tank higher the the motor like a softtail? This is something you'll have to live with if you let your bike sit for a few weeks...Yes check the ball valve...It will slowly seep down into the motor over time and when you start it, it has to go somewhere.... Pretty common.

[brokenwing]

Is this a softtail? Is the oil tank higher the the motor like a softtail? This is something you'll have to live with if you let your bike sit for a few weeks...Yes check the ball valve...It will slowly seep down into the motor over time and when you start it, it has to go somewhere.... Pretty common.

My evo chopper has never leaked a drop of oil. Its 8 yrs old.

[Redrubicon2004]

I called S&S today and asked them about it.  They said if it has head breathers and the intake has provisions for them and they are working properly, then I can plug the crankcase breather.  They said it is not necessary to use it if I am using head breathers.

What are your thoughts guys?

[deathwish]

If your engine has head breathers then get rid of the case breather. Since we know you are having a sumping issue (spitting out oil after sitting) you need to do several things. First verify you are getting good return flow into the oil tank. I assume you are or your problem would already be worse. watch the flow into the tank. If it looks good you can rule out a key problem. I would then drain the oil from the tank and remove the plug on top the oil pump. There are 2. You want to remove the inside lower one. Remove the spring and take a magnet and remove the check ball. Look cosely into the seat area of the pump for anything foriegn and look at the seat carefully. If everything looks good, put the ball back in and get a flat nose drift punch and place on top the ball and firmly rap it with a small hammer. You are making  sure the seat conforms to the ball. Don't hit it so hard as to try to knock the pump off the engine. If in doubt as to the ball and spring condition an HD ball and spring are the same so you can easily get a new ball and spring. This seat correction usually fixes sumping issues.

[cavalierjoe]

i have a s&s 113ci on a 2004 ironhorse that i just bought this past weekend. im not for sure how long the bike has been sitting but it runs great. only problem is this same issue u guys r talking about. my question is...... do i plug the filter and just do away with it or maybe a check valve in line with the filter word work? only problem is if i use a check valve, that means the crank can only suck air in and no release any pressure! does the crank use the filter to suck in air or exhaust it? thanks for all your input.

[cavalierjoe]

im new to these style motors and i was wondering where is this ball and spring located in these motors anyways?

[War Horse]

Another little thing to do, after reseating the check ball take the spring and stretch it out another halve of the total length, I used to do this to all motor rebuilds I did...

Though inspection of the oil pump shaft and keyways is in order, I've seen sheared keys that hold on intermittently due to the slag left on the shaft from shearing...

[DresserDan]

I have a S&S 113 Changed oil and filter and had a similar problem.Drained some oil and put a Evo oil filter on helped .This was on a custom build.Very small oil tank.

[Slider52501]

Not all that familiar with the S&S engines rubicon but from what I understand reading the posts here and elsewhere they are pretty much an evo based design. (Have they got any twin cam clones yet?)

If this is the case then blowing oil out your crank breather hose is not all that out of the ordinary...my 88 evo does it once in a blue moon but only if it has been parked for a month or two..

So, what I am thinking, if the bike doesn't blow oil when you are runniung it (which means the oil pump is scavenging oil OK)is that you have a bad seal between the oil pump check ball and the seat. This allows oil to seep past the check valve from the tank and collect in your crankcase and then on start up your crank vent system upchucks it on the ground. The salesman said that the ball had been replaced but a complete repair would have included giving the seat a little refinishing...there is a little lapping tool available for this I believe.

Anyway...a little food for thought....there are some harley guys on here that will no doubt will give you a few more ideas to consider.

tink

Yes, they now have a Twin Cam engine its called the T124 Dual Cam for 1995-2006 Big Twin and is supposed to fit into the factory frame with no modifications