rocker boxes leaking oil constantly
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Intermediate
Joined: Jun 2012
Posts: 42
Likes: 0
From: ME
rocker boxes leaking oil constantly
ok so i finally got my bike on the road and the front rocker box just spews oil, ive replaced the rubber gaskets with both harley and james and torqued them down correctly they both were clean and DRY my next guess its got to much pressure ???? could the breather vent be blocked , its an 85 engine any ideas???
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,548
Likes: 7,197
From: Oxford, Nc
A warped or mismatched rocker part. If I remember, 91 and earlier had smooth mating surfaces while 92 and later were "toothed."
Also the notion of a warped middle or top rocker piece is well with in the realm of possibilities.
Also the notion of a warped middle or top rocker piece is well with in the realm of possibilities.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,200
Likes: 3,089
From: NW AR
Yeah, put the rockrs on a piece of glass and see if they are flat.
Also, you might try putting some NAPA Aircraft Gasket Sealant stuff on both sides of the gaskets when you put it together. And make sure that the push rod tubes aren't leaking, as they can fool you too.
Also, you might try putting some NAPA Aircraft Gasket Sealant stuff on both sides of the gaskets when you put it together. And make sure that the push rod tubes aren't leaking, as they can fool you too.
Road Warrior
Joined: Jun 2009
Posts: 1,687
Likes: 9
From: SoCal & West TN
The '85 motor has the breather out of the case, located down beside the oil pump.
It breathes out of the bottom end, not out of the heads.
It breathes out of the bottom end, not out of the heads.
Banned
Joined: Jul 2010
Posts: 853
Likes: 19
From: Melbourne
NOTE: There are at least TWO types and shapes of gaskets for the Evo Rocker boxes so make absolutly sure your using the right set. Check in the James Catalouge for your year etc.
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Road Warrior
Joined: Sep 2005
Posts: 1,569
Likes: 12
From: Arizona
mine did the same thing after putting it back together, mech told me to use permatex ultra grey, coat the surfaces, and orings, let them sit for 15 minutes and but together, hasnt leaked since.
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Elite HDF Member
Joined: Oct 2005
Posts: 3,872
Likes: 83
From: Canton, Michigan
Check all three, although it is generally the middle one that is warped. If it has the slightest bit of wiggle, it won't seal no matter how tight you have the bolts.
Ya gotta trust me on this. I battled a rocker box leak for three years.