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  #1  
Old 3 Weeks Ago
Moparnut73 Moparnut73 is offline
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Default Ironhead primary filling with oil not puking

Hi, I know the topic of Ironhead primaries filling with oil has been discussed at length but o haven't seen quite my problem. I have a75 xlch. When it sits the oil drains and fills up the primary then leakes. I have not yet tried to clean or replace the ball check. Here's the thing. When I start it up nothing pukes from the breather tube. It all seems to end up back in the oil tank. Is this another problem ? Or is it the same ol problem bof the ball valve. I'd rather do it right once than hit or miss mechanics.
Thanks
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Well it sounds like your bike is doing exactly what it should be doing. Except for leaking. Where is it leaking from when the primary fills up? Can that leak be fixed?

Your motor has what is called an oil transfer valve. The Moco put this in the motor for this very issue. Oil leaks down by gravity from your tank, past your check ball or more likely past the bushings in the pump shaft. It then fills up the crank case untill it hits the level of the transfer valve.

At this point all the extra oil in the motor transfers to the primary so that your motor doesn't get so full that it pukes all over your driveway.

Then as your bike is running it transfers back through that valve into the motor. This is why it seems to end up back in the tank. It's doing just what it is supposed to do. Except leak.
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I can fix the leak out the primary...just a gasket leak for the most part. I was just concerned since I kept reading about it puking out the breather tube and that never happens. I was concerned itay be leaking by somewhere else. Is there a problem on start up if all the oil has ended up there?
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Yes that is an issue. Never start the bike with an empty tank.

So it completely drains the tank?
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also, it's not puking from the breather because the cam chest isn't filling up and the scavenge side of your pump is working properly - like cory said.
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Can you give us an idea of the actual quantity of oil being dealt with ? Is it migrating 1/2 oz., 1-2 oz., 2-3 quarts, or ? And is it migrating to the primary while you're out riding, or only while it is parked, or both ? If the amount is 8 oz (or more), I think something is amiss. Less than 8 oz, you might just live with it.

So where to start ? A suggestion:
  • first, fix any leaks, then get the primary to a known level:
    • park your ride, vertically (aka upright).... not on the side stand
    • remove the oil leveling screw on your primary & drain off any excess oil (or add oil), so the primary level is where it should be. Discard this oil or put it back in the tank if you're satisfied it's not contaminated.
  • let the bike sit (upright, not on the side stand) unattended for whatever timeframe is normal for you, and
  • using a clean catch can, capture any oil that migrates out thru the oil leveling screw hole
  • record the amount of time the bike sat & the amount of oil captured.
And at your next opportunity....
  • re-establish the correct oil level in your primary
  • go for a 1-2 hour ride
  • when you return.... again park your bike vertically (aka upright)
  • immediately remove the oil leveling screw on your primary & drain off any excess oil
  • measure & record the excess amount drained off
  • and if there is no excess.... you gotta ask..... where did the oil go ? Leaked out or migrated to the oil tank ?
Armed with this info, maybe we can provide some other suggestions.
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Quote:
Originally Posted by The Doctor71 View Post
....... And is it migrating to the primary while you're out riding, or only while it is parked, or both ?........
If oil migrates to the primary when riding, rather than when parked,it could be a faulty transfer valve. I had issues with that. To work it out for sure I tried riding enough to warm up the oil then made sure oil levels in both tank and primary were good before going for a longer ride. I found that the primary could have more than 1.5 times the oil it should have after a 100 mile ride, and the oil tank level was reduced accordingly, so the migration was definitely when riding in my case. I changed the seal behind the front primary sprocket but nothing improved. Then a new oil transfer valve, as recommended by a member here, cured the problem completely.
Sounds like your issue is when parked but thought I'd share that anyway as it may help someone sometime.
Paul
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