sprocket shaft seal problem
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Road Captain
Joined: Nov 2007
Posts: 517
Likes: 6
From: Ottawa, ON
sprocket shaft seal problem
Gentlemen,
I've heard that earlier Evo's have a problem with the sprocket shaft seal - it gets out of the seat somehow.
Does anyone know which years are affected? Mine is '94. If yes, is there a fix?
Or, should I look for other causes, like blowby for instance?
[
]
I've heard that earlier Evo's have a problem with the sprocket shaft seal - it gets out of the seat somehow.
Does anyone know which years are affected? Mine is '94. If yes, is there a fix?
Or, should I look for other causes, like blowby for instance?
[
]
Outstanding HDF Member
Joined: Jun 2007
Posts: 3,306
Likes: 5
From: Bellville, Tx
RE: sprocket shaft seal problem
I haven't heard of the seal getting "out of the seat" but I run on a lot of sand and gravel roads which wears the seal prematurely. Over time theseal wears a groove where it contactsthe shaftand will produce a leak that way, not solved by replacing seal. Hopefully someone has experienced your problem and will post a solution. Good Luck.
Road Warrior
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
RE: sprocket shaft seal problem
Are you diluting the primary fluid with engine oil The primary fluid should be clear if it is dark brown and more than a quart comes out the drain and the engine oil level is dropping in the oil tank the engine seal is leaking or in earlier evo's 87/88/89 the left engine case allows blow by by the steel insert cast into the case
Thread Starter
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Road Captain
Joined: Nov 2007
Posts: 517
Likes: 6
From: Ottawa, ON
RE: sprocket shaft seal problem
gigiglip: yes that's the one I'm, talking. I have a wet primary (stock)
Thanks a lot, sqdealgeorge. I feel much better now. My case does not have a steel insert, and it is genuine from '94!
besides, I just got it to the shop a couple of days ago, and they said they do not see any particular problem with those seals.
But blowby could be to blame: I was thinking myself before: it is weird to have hone marks intact after 80k. They said it looks like there was some overheating damage, and the previous owner just honed it, instead of reboring (even probably kept the old pistons).
The weird thing about sucking oil out of primary (so I'm actually dilluting engine oil with primary), could be probably explained by the fact that the seal was installed backwards (like on dry primaries)...
[&:]
ORIGINAL: sqdealgeorge
Are you diluting the primary fluid with engine oil The primary fluid should be clear if it is dark brown and more than a quart comes out the drain and the engine oil level is dropping in the oil tank the engine seal is leaking or in earlier evo's 87/88/89 the left engine case allows blow by by the steel insert cast into the case
Are you diluting the primary fluid with engine oil The primary fluid should be clear if it is dark brown and more than a quart comes out the drain and the engine oil level is dropping in the oil tank the engine seal is leaking or in earlier evo's 87/88/89 the left engine case allows blow by by the steel insert cast into the case
besides, I just got it to the shop a couple of days ago, and they said they do not see any particular problem with those seals.
But blowby could be to blame: I was thinking myself before: it is weird to have hone marks intact after 80k. They said it looks like there was some overheating damage, and the previous owner just honed it, instead of reboring (even probably kept the old pistons).
The weird thing about sucking oil out of primary (so I'm actually dilluting engine oil with primary), could be probably explained by the fact that the seal was installed backwards (like on dry primaries)...
[&:]
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Road Captain
Joined: Nov 2007
Posts: 517
Likes: 6
From: Ottawa, ON
RE: sprocket shaft seal problem
On top of it, I'm considerig to switch to S&S reed breather valve, in place of rotating stock.
Do you think it could bring more assurance?
Do you think it could bring more assurance?
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Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
RE: sprocket shaft seal problem
ORIGINAL: jokenroll
Gentlemen,
I've heard that earlier Evo's have a problem with the sprocket shaft seal - it gets out of the seat somehow.
Does anyone know which years are affected? Mine is '94. If yes, is there a fix?
Or, should I look for other causes, like blowby for instance?
[]
Gentlemen,
I've heard that earlier Evo's have a problem with the sprocket shaft seal - it gets out of the seat somehow.
Does anyone know which years are affected? Mine is '94. If yes, is there a fix?
Or, should I look for other causes, like blowby for instance?
[
]Other things that go wrong include leaking cylinder base gaskets, broken gear-lever return spring (the lever will not return to the rest position on its own), burned out alternator stator. Had them all! Later parts fix them all.
I reckon your bike should be OK. I thought most if not all these things were put right around 1992, although I am happy to be put right.
Advanced
Joined: Nov 2006
Posts: 52
Likes: 0
RE: sprocket shaft seal problem
Not saying it can't happen to you, but the main culprits were from 86 to 93.Thesestyle Harley pulleys have a screw that is supposed to stop the pulley hold down nut from backing off. Sooner or laterthe screw breakswhich will thenallow the nut to back off. The pulley thentravels back and forth on the 5th gear mainshaft splines. It can't fall offbecause it runs into the back side of the inner primary but the splines begin to wear rapidly. You cantell if the nut has backed off becausethere will be a puddle of transmission fluid under the bike. Look beneath the pulley at the rear inside of the primary casings.Anyway, asthe pulley moves out along the splines it allows the pulley spacer to move out also. The spacer also acts as the inner race for the transmission oil seal allowing fluid to flow out and onto the ground. This, I believe, is the problem that you are referring to.