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Breather purging

Moderators: Curt!, Pa

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flhghost

Posts: 43

Joined: Sun Oct 17, 2004 12:01 am

Location: Plymouth,Ma. USA

Post Sat Jun 09, 2007 4:19 am

Breather purging

I have a 1980 fl that is puking large amounts of oil from breather hose that originally went to air cleaner but has since been rerouted under bike.
I checked the oil pump for sheared keys and found none.
I checked oil lines and all seem correct.
I freshened up oil pump and still have the same problem.
Scratching my head on this one.
Any thoughts??
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d.rinner-okc

Posts: 28

Joined: Tue Oct 04, 2005 9:05 pm

Location: Oklahoma City OK USA

Post Sat Jun 09, 2007 8:29 am

breather purging

does it puke every time? Or just if it sits a couple days or longer? If only when it sits, you may need a new checkball & spring in the oil pump. The
ball's job is to hold the oil in the tank against gravity flow. The pressure
when it's running pushes it up. It may have corrosion or flat spots. If the
ball is bad, the seat it fits into may be bad also. There are ways to repair
that on this and other forums. One member has even built a tool to make this repair professionally.
If it sprays oil the whole time it is running, your chain oiler may be open.
Or if your engine is made from parts of different vintages (as my new Pan
is) there may be a passage from the oil pump into the cam chest that is
putting so much oil into the lower end your scavenge side can not keep up. Have you removed the return line & started the engine to see how the
return flow is? On a stock '80 you can remove the large cap under the seat, and see the flow. Caution, you may get oil everywhere! Pull the filter
out to perform this. Put the bike on a stand or table to sit level. Pull the cap then start it and watch. Probably get a new gasket for the cap if it's been a while since the cap was off.
Good Luck, I'm still chasing mine, too. d.rinner-okc
old harley parts are MY 401K!
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Flatironmike

Posts: 54

Joined: Mon Sep 08, 2003 12:01 am

Location: NYC / NoHi, CT

Post Sat Jun 09, 2007 2:58 pm

check check ball and spring

check check ball and spring

no I didn't stutter.

as d.rinner intimated, your check ball may be hanging up.

hope this helps.

let us know.

MC
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flhghost

Posts: 43

Joined: Sun Oct 17, 2004 12:01 am

Location: Plymouth,Ma. USA

Post Sun Jun 10, 2007 3:02 am

Breather purging

Check Ball is OK
Doesn't puke at start up like when oil seeps to lower end. It has to run for 2~3 minutes and then it starts to flow out breather. As I said before keys in oil pump are good.
Bike does have a home made oil tank . Possibly vent tube is too low???
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greybeard52

User avatar

Posts: 1050

Joined: Tue Dec 05, 2000 1:01 am

Location: Chatham, NJ, USA

Post Tue Jun 12, 2007 10:35 pm

Does it still have the stock plastic breather gear? If so, replace it with a properly fitting metal breather gear. Those plastic breathers were one of the factory's attempts at saving money and are a P.O.S. G
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sleeper

User avatar

Posts: 1538

Joined: Thu Jun 19, 2003 12:01 am

Post Wed Jul 16, 2008 11:20 pm

Re: Breather purging

You posted: "Possibly vent tube is too low???"
Maybe you could lower the oil level & re-test, Of course keeping it still at a safe level tho...
Last edited by sleeper on Wed Jul 16, 2008 11:23 pm, edited 1 time in total.
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sleeper

User avatar

Posts: 1538

Joined: Thu Jun 19, 2003 12:01 am

Post Wed Jul 16, 2008 11:22 pm

Re: Breather purging

.....
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flhghost

Posts: 43

Joined: Sun Oct 17, 2004 12:01 am

Location: Plymouth,Ma. USA

Post Sun Aug 03, 2008 3:28 am

Re: Breather purging

The problem with purging was found to be the oil tank which had been modified.Not sure what was wrong exactly because the tank needs to be cut open to inspect the tubes, Put stock tank back in and have no more problem.This bike sat on the backburner since last year but I wanted to post reply about what remedied the problem.
Thanx for the help
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Pa

Site Admin

Posts: 4676

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Sun Aug 03, 2008 8:46 am

Re: Breather purging

Aftermarket 45 tanks had a tube issue too. There are some cut open pics in the data base of those. Pa

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