Help! Harley-Davidson Evo Engine Problem
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6th Gear
Joined: Jul 2008
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RE: Help! Harley-Davidson Evo Engine Problem
Thanks Dr.Hess, your hints will be surely useful.
 \\;
I checked already johntheone \\;conception. Breather line is free (not plugged) and timing is OK. /Breather valve is standard (plastic)./
...I have early Evo - \\;bottom-breather engine (not heads breathing!). Maybe has someone \\;early Evo???
 \\;
...If piston rings be worn out, then combustion gases get to engine case...
I wonder, or so good static cylinder pressure (about 145 PSI) \\;can be near \\;worn out piston \\;rings???
 \\;
I checked already johntheone \\;conception. Breather line is free (not plugged) and timing is OK. /Breather valve is standard (plastic)./
...I have early Evo - \\;bottom-breather engine (not heads breathing!). Maybe has someone \\;early Evo???
 \\;
...If piston rings be worn out, then combustion gases get to engine case...
I wonder, or so good static cylinder pressure (about 145 PSI) \\;can be near \\;worn out piston \\;rings???
Seasoned HDF Member
Joined: Dec 2004
Posts: 11,068
Likes: 1,478
From: Texas! Ya mean there's someplace else?
RE: Help! Harley-Davidson Evo Engine Problem
If replacing the seal does not work and there is no obvious crack, expect to find a worn out main bearing, or it is leaking past the race.
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Joined: Sep 2007
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RE: Help! Harley-Davidson Evo Engine Problem
The issue is likely to be the crank seal...which you cannot replace, the seal is pressed when the cases are made and not repairable... per HD. \\; My buddy had a 1990 FLHT with a similar issue. \\; Under warranty \\;HD fixed the issue with a new cases (parts and labor)...why? because the crank bearing tolerance was manufactured wrong in late '89 and 90 models. \\; Therefore, oil will pass into the primary, HD never issued an "out right" recall \\;but did \\;fix the bikes on an as needed bases. \\; The defect was noted in the TSB Feb 1990. \\; \\;You can call HD (not a dealer...they don't know jack) and they will confirm the issue. \\;
 \\;
To test...pull the primary completely, pressurize the cases with air (don't need alot of pressure) apply soapy water around the crank seal...most likely you \\;will see bubbles. \\; Although, lets hope \\;this is not the problem. \\; \\;
 \\;
To test...pull the primary completely, pressurize the cases with air (don't need alot of pressure) apply soapy water around the crank seal...most likely you \\;will see bubbles. \\; Although, lets hope \\;this is not the problem. \\; \\;
Seasoned HDF Member
Joined: Dec 2004
Posts: 11,068
Likes: 1,478
From: Texas! Ya mean there's someplace else?
RE: Help! Harley-Davidson Evo Engine Problem
ORIGINAL: Locutions
The issue is likely to be the crank seal...which you cannot replace, the seal is pressed when the cases are made and not repairable... per HD. \\;\\\\\\; My buddy had a 1990 FLHT with a similar issue. \\;\\\\\\; Under warranty \\;\\\\\\;HD fixed the issue with a new cases (parts and labor)...why? because the crank bearing tolerance was manufactured wrong in late '89 and 90 models. \\;\\\\\\; Therefore, oil will pass into the primary, HD never issued an "out right" recall \\;\\\\\\;but did \\;\\\\\\;fix the bikes on an as needed bases. \\;\\\\\\; The defect was noted in the TSB Feb 1990. \\;\\\\\\; \\;\\\\\\;You can call HD (not a dealer...they don't know jack) and they will confirm the issue. \\;\\\\\\;
 \\;\\\\\\;
To test...pull the primary completely, pressurize the cases with air (don't need alot of pressure) apply soapy water around the crank seal...most likely you \\;\\\\\\;will see bubbles. \\;\\\\\\; Although, lets hope \\;\\\\\\;this is not the problem. \\;\\\\\\; \\;\\\\\\;
The issue is likely to be the crank seal...which you cannot replace, the seal is pressed when the cases are made and not repairable... per HD. \\;\\\\\\; My buddy had a 1990 FLHT with a similar issue. \\;\\\\\\; Under warranty \\;\\\\\\;HD fixed the issue with a new cases (parts and labor)...why? because the crank bearing tolerance was manufactured wrong in late '89 and 90 models. \\;\\\\\\; Therefore, oil will pass into the primary, HD never issued an "out right" recall \\;\\\\\\;but did \\;\\\\\\;fix the bikes on an as needed bases. \\;\\\\\\; The defect was noted in the TSB Feb 1990. \\;\\\\\\; \\;\\\\\\;You can call HD (not a dealer...they don't know jack) and they will confirm the issue. \\;\\\\\\;
 \\;\\\\\\;
To test...pull the primary completely, pressurize the cases with air (don't need alot of pressure) apply soapy water around the crank seal...most likely you \\;\\\\\\;will see bubbles. \\;\\\\\\; Although, lets hope \\;\\\\\\;this is not the problem. \\;\\\\\\; \\;\\\\\\;
Big Kahuna HDF Member
Joined: Mar 2007
Posts: 29,598
Likes: 19
From: Oregon
RE: Help! Harley-Davidson Evo Engine Problem
Just my .02, I'd replace that bottom breather valve first. It may not be the problem but they do go bad, they are cheap and easy. Won't hurt to have a new one anyway.
Big Kahuna HDF Member
Joined: Mar 2007
Posts: 29,598
Likes: 19
From: Oregon
RE: Help! Harley-Davidson Evo Engine Problem
I would also check or replace all of the breather hoses for the h3ll of it. Sometime they can plug up. Even if the breather or hoses don't solve it, it's good cheap maintenance.
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6th Gear
Joined: Jul 2008
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RE: Help! Harley-Davidson Evo Engine Problem
Hi!
pococj, Locutions
 \\;
what it marks word: "race", about which you write???
I think you mean the race. The seal is on the outside and is easily replaced.
 \\;
Have You \\;on thought "bearing race"???
 \\;
 \\;
Advanced
Joined: Oct 2005
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RE: Help! Harley-Davidson Evo Engine Problem
 \\;STD can replace the seal and race on your engine case, it's a up grade they do, had it done on my cases (I have a 90 FLH). \\; You will need to split the cases and send both \\;sides in. \\; But before I did that I would make sure nothing else could be causing your problem.