cold weather oil weep
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,116
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From: Poolville
jug alignment
All metals warp when heated and cooled and over time they can twist (warp) which can move the top of the cylinder off its true center line. When it is said, that the bottom of the jugs surface need to be trued a machinist will square the bottom mating surface of the jugs to the center line of the cylinder so the piston and rod will travel in a parallel line to the cylinder and crank which will decrease any excessive side load In the rod bearings, positions and rings. Applying an equal force around the circumference of the piston. Which in turn will lower the friction and decrease abnormal wear.
I don't accept that! Skimming a few thou off the bottom of a cylinder isn't going to materially alter the geometry or the action of those components. Scott himself suggested it on a similar thread to this, that using better base gaskets wasn't always the solution, as the cylinder base needed to be made flat. Need-less-to-say I can't find the other thread!
Outstanding HDF Member
Joined: Jul 2013
Posts: 2,874
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From: Houston, TX
All metals warp when heated and cooled and over time they can twist (warp) which can move the top of the cylinder off its true center line. When it is said, that the bottom of the jugs surface need to be trued a machinist will square the bottom mating surface of the jugs to the center line of the cylinder so the piston and rod will travel in a parallel line to the cylinder and crank which will decrease any excessive side load In the rod bearings, positions and rings. Applying an equal force around the circumference of the piston. Which in turn will lower the friction and decrease abnormal wear.
Seasoned HDF Member
Joined: Apr 2011
Posts: 6,185
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From: W. Texas
When I had mine apart I was told to stay away from paper base gaskets. The gaskat set I ordered came with metal base gaskets. About 2 years now __ no leaks yet. Not sure I'd go to the trouble if just the base is leaking, I had mine apart for other reasons.
WP
WP
Road Master
Joined: Oct 2011
Posts: 957
Likes: 2
From: Carlsbad Springs Ontario
Ditto Yankee Dog re: synthetic oil.
If you use synthetic oil, you can reduce or eliminate it by going with conventional dino oil.
Mine did the same thing when I bought it used, I switched to conventional oil and let the cylinders "grow" from the heat (translation: let the engine warm up till the heads are uncomfortably warm" and no more bubbles.
I every reason to believe I have the stock cylinder base gaskets. YD
Mine did the same thing when I bought it used, I switched to conventional oil and let the cylinders "grow" from the heat (translation: let the engine warm up till the heads are uncomfortably warm" and no more bubbles.
I every reason to believe I have the stock cylinder base gaskets. YD
slightly worn o ring , gasket or oil seal.
If i understand correctly you have noticed oil bubbles at the base gaskets as described , you should check the engine breather system for correct operation as leaks are one thing but air pressure at the base gaskets is not normal .
Road Captain
Joined: Jul 2014
Posts: 717
Likes: 15
From: San Dimas
All metals warp when heated and cooled and over time they can twist (warp) which can move the top of the cylinder off its true center line. When it is said, that the bottom of the jugs surface need to be trued a machinist will square the bottom mating surface of the jugs to the center line of the cylinder so the piston and rod will travel in a parallel line to the cylinder and crank which will decrease any excessive side load In the rod bearings, positions and rings. Applying an equal force around the circumference of the piston. Which in turn will lower the friction and decrease abnormal wear.
Last edited by Rhino-1; Nov 11, 2014 at 09:29 AM.
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