Oil tank pressure?
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Seasoned HDF Member
Joined: Sep 2012
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From: almost there
Oil tank pressure?
Don't know if this is good or not but running it by you guys .
This only happened once. Went for a short ride and looked dn to see my oil filler cap had popped off and was sitting loosely on top of filler hole.
Rubber seal seems to be tight on cap but the pressure seems to be high..
No hot rodding at all when it happened.
Has not done it again but pressure seems high in the oil tank..??
This only happened once. Went for a short ride and looked dn to see my oil filler cap had popped off and was sitting loosely on top of filler hole.
Rubber seal seems to be tight on cap but the pressure seems to be high..
No hot rodding at all when it happened.
Has not done it again but pressure seems high in the oil tank..??
Road Master
Joined: Nov 2013
Posts: 1,216
Likes: 286
From: Buford, GA
Is your oil level higher than the bottom of the weld on the filler tube? If you have too much oil in the tank it will cover the vent and cause pressure build up.
Also check the breather hose for kinks.
Also check the breather hose for kinks.
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Seasoned HDF Member
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From: almost there
Made sure hoses were open and I run my oil slightly lower than full mark
Seasoned HDF Member
Joined: Jun 2010
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From: Upstate New York
Happened to a friend of mine. Turned out to be a broken piston ring causing excessive crankcase pressure to build. If tank pressure "seems high", it must be coming from somewhere. I'd perform a leak down test and see what it tells me.
Its happened to me a couple of times, but it's always been a shrunken filler plug. A new plug fixed it.
Its happened to me a couple of times, but it's always been a shrunken filler plug. A new plug fixed it.
Last edited by Uncle G.; Jun 21, 2017 at 06:44 AM.
Dirt don't hurt
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From: Haslet Texas
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Seasoned HDF Member
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From: almost there
Well you ought to know your head been vented since you were born😁
Thread Starter
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Seasoned HDF Member
Joined: Sep 2012
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From: almost there
Happened to a friend of mine. Turned out to be a broken piston ring causing excessive crankcase pressure to build. If tank pressure "seems high", it must be coming from somewhere. I'd perform a leak down test and see what it tells me.
Its happened to me a couple of times, but it's always been a shrunken filler plug. A new plug fixed it.
Its happened to me a couple of times, but it's always been a shrunken filler plug. A new plug fixed it.
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Seasoned HDF Member
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From: la la land jerzey
we have had new pistons with the ring lands that do Not have the right spacing for the rings and they stick an wont let go
do a leak down test dry then wet
do a leak down test dry then wet
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Seasoned HDF Member
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From: almost there
Follow up on oil tank pressure and oil cap being pushed off. Not that anyone cares but awh well.
I ran 2 - 3/8 ID gas lines, one off each head breather. Ran them both up and over the heads and under main frame, then down and out by the rear swingarm and pointed out past rear tire. Seems to be doing well and the oil cap stays in place. Problem solved.
I ran 2 - 3/8 ID gas lines, one off each head breather. Ran them both up and over the heads and under main frame, then down and out by the rear swingarm and pointed out past rear tire. Seems to be doing well and the oil cap stays in place. Problem solved.
Cruiser
Joined: Aug 2010
Posts: 146
Likes: 2
From: Southern MN
Oil tank pressure?
This sorta happened to me. When the plug pops out, does oil come with it? Mine was pumping primary oil in to the engine or the engine was sucking it out of the primary. If this is true check primary oil level to see if it is low. I have seen a couple of threads about this type of trouble.
Good Luck
Doug
Good Luck
Doug