Engine Experts Please Read....
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Cruiser
Joined: Sep 2007
Posts: 124
Likes: 38
From: Middleburg, FL
Finally got around to pulling the bike apart. Have everything off except the head. I found oil in the intake side of the head. I'm going to run the leakdown check on Monday before I pull the head off to see how bad it is. I'm keeping my fingers crossed that this is the problem.
Road Master
Joined: May 2007
Posts: 851
Likes: 5
From: Mitchellville, Ia.
We have seen this many times when making high performance mods to these TC engines. Because they do not have the internal volume that the Evo's and the Shovel's had they don't breath as well as their predicessors when you make them larger and when you make them rev quicker. The first thing we do is vent the heads to atmosphere so that the A/F charge is not contaminated with oil. Next we use straight weight fossil oil that starts out and stays thicker and doesn't take on air as easy when hot and leave the oil bag 1/2 to 3/4 of a quart low so more buffer volume in system. Or you can vent the oil bag to atmosphere. When we see oil usage like yours many times it is caused by over filling the system. If the rings are gone it will smoke on excell, if a valve seal decell. Good luck.
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Cruiser
Joined: Sep 2007
Posts: 124
Likes: 38
From: Middleburg, FL
It's been an interesting week. I pulled the head and cylinder off. A portion of the bottom oil ring had gone perpendicular to the piston and wore the heck out of the cylinder wall. No damage to the piston itself. Ordered new cylinder and rings, gaskets, etc (About $300). I probably screwed it up during installation. Live and learn, right? Hopefully she'll be ready to ride at the end of next week.
Cruiser
Joined: Jul 2011
Posts: 210
Likes: 1
From: Pacific Northwest
Sounds like the ring compressor wasn't holding the oil ring assembly quite all the way in and the bottom scraper ring hung on the bottom of the cylinder on the way in.
Last edited by pnw_hd_rider; Aug 6, 2011 at 02:42 PM.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
My '05 Deuce came with bad valve guide seals and was consuming 1.5 quarts of oil in less than 1000 miles. I arrived at that conclusion through leakdown and compression testing; dealer replaced the seals under warranty.
Last edited by djl; Aug 6, 2011 at 02:06 PM.
Cruiser
Joined: Jul 2011
Posts: 210
Likes: 1
From: Pacific Northwest
When top end problems surface, SOP is to check compression and leakdown just to get a feel for what is going on. Bad guide seals could have been the source of the oil burning which would have shown up on a leakdown test.
My '05 Deuce came with bad valve guide seals and was consuming 1.5 quarts of oil in less than 1000 miles. Showed up on leakdown and dealer replaced the seals under warranty.
My '05 Deuce came with bad valve guide seals and was consuming 1.5 quarts of oil in less than 1000 miles. Showed up on leakdown and dealer replaced the seals under warranty.
So I apologize for being off base with that statement. That much oil burning could indicate damaged cylinder walls, so a compression / leak down test is a good starting point. My statement that the oil scrapers have nothing to do with compression was incorrect in this case since the damaged oil scraper scored the cylinder wall.
However, I don't see how a valve guide seal could possibly show up on a compression / leak down test since the guides / seals have nothing to do with compression (unless a guide is so bad that the valve isn't seating properly).
EDIT:
After thinking about that for a moment, I realized that if a compression / leak down test shows no problem with rings /cylinder walls, then it would indicate that the problem was in the valve guide seals.
I'll shut up and go sit in the corner now.
Last edited by pnw_hd_rider; Aug 6, 2011 at 02:00 PM.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
After posting that I realized that in this particular situation, a compression check probably would have shown lower compression on that jug due to the damaged cylinder wall.
So I apologize for being off base with that statement. That much oil burning could indicate damaged cylinder walls, so a compression / leak down test is a good starting point. My statement that the oil scrapers have nothing to do with compression was incorrect in this case since the damaged oil scraper scored the cylinder wall.
However, I don't see how a valve guide seal could possibly show up on a compression / leak down test since the guides / seals have nothing to do with compression (unless a guide is so bad that the valve isn't seating properly).
EDIT:
After thinking about that for a moment, I realized that if a compression / leak down test shows no problem with rings /cylinder walls, then it would indicate that the problem was in the valve guide seals.
I'll shut up and go sit in the corner now.
So I apologize for being off base with that statement. That much oil burning could indicate damaged cylinder walls, so a compression / leak down test is a good starting point. My statement that the oil scrapers have nothing to do with compression was incorrect in this case since the damaged oil scraper scored the cylinder wall.
However, I don't see how a valve guide seal could possibly show up on a compression / leak down test since the guides / seals have nothing to do with compression (unless a guide is so bad that the valve isn't seating properly).
EDIT:
After thinking about that for a moment, I realized that if a compression / leak down test shows no problem with rings /cylinder walls, then it would indicate that the problem was in the valve guide seals.
I'll shut up and go sit in the corner now.
Last edited by djl; Aug 6, 2011 at 02:06 PM.
Thread Starter
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Cruiser
Joined: Sep 2007
Posts: 124
Likes: 38
From: Middleburg, FL
Your are absolutely right!
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