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02-09-2014, 02:36 PM | #1 |
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Join Date: May 2010
Location: Portland, Oregon
Posts: 5,902
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Loose cylinder sleeve
Has anyone had a sleeve come loose? What are the symptoms? What is the cause? How may miles before it happened, if you know?
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Ray Horton, Portland, OR As you go through life, keep your eye on the donut, not the hole. |
02-09-2014, 04:17 PM | #2 |
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Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,508
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Re: Loose cylinder sleeve
Yes, I have seen it happen, and usually what happens is it drops down (pulled downward by the friction of the piston & rings) and once it gets low enough, the crankshaft will hit it and break the sleeve or lock the engine.
This is usually cause by the machinist not machining a ledge on the bottom of the cylinder bore. A new sleeve that is installed to replace that one can either be tack-welded in, --or some will drill and pin the sleeve at the bottom with a bolt through the wall and then the excess bolt is machined during the "re-boring" process where it is hidden. Not the end of the world but definitely time consuming to repair. |
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02-09-2014, 05:06 PM | #3 |
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Join Date: May 2010
Location: NC
Posts: 2,975
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Re: Loose cylinder sleeve
It is caused by improper installation. Not enough interference between the sleeve and cylinder wall. Plus no locking compound on the sleeve. Putting a step at the bottom is not a bad thing, but not need if done right.
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02-09-2014, 07:27 PM | #4 |
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Join Date: May 2010
Location: Asheville,NC
Posts: 3,104
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Re: Loose cylinder sleeve
I have had it happen twice,once on a motor of my own before I did my own boring and one in a customer engine that was already sleeved before I got it. When the sleeve drops normally the first thing that happens is the rings move to a position higher than the sleeve and the rings pop out and snap the top off the piston. This sounds like a really bad knock. If the motor is running fast the sleeve can drop enough to snap the piston (inevitable) and move down far enough to contact the crank and cause lockup or worse. I always leave a ledge at the bottom or if the sleeves are pre installed, I drill and tap a 1/4-20 hole at the bottom of the valve chamber into the cylinder and use a socket head bolt to secure the sleeve. I then grind the inside part of the bolt off and bore the hole. This puts the bolt at a spot lower than the rings and in a position that it is in an oil to oil spot, and cannot be seen from the outside of the motor.
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02-09-2014, 07:45 PM | #5 |
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Join Date: May 2010
Location: Wichita, Kansas
Posts: 710
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Re: Loose cylinder sleeve
I have seen it happen twice. Both were recent rebuilds (not by me) and occurred right after shutting the engine off after a long drive. The residual heat built up caused the cylinder to expand and the sleeve dropped down against the crankshaft which locked the engine. No damage was done (other than having to get the car towed home). They were both returned to the original builder and fixed. If I get an engine with sleeves that don't have the step at the bottom of the cylinder, I always put a cast iron pin in each cylinder like James talked about above.
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02-10-2014, 01:38 PM | #6 |
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Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,084
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Re: Loose cylinder sleeve
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02-10-2014, 02:20 PM | #7 |
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Location: South California
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Re: Loose cylinder sleeve
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02-11-2014, 12:44 PM | #8 |
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,084
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Re: Loose cylinder sleeve
none, just a .0025 press dit. i also set the piston clearance a little on the loose side, .003 absolute minimum on a stock engine, more on a performance engine.
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02-11-2014, 12:54 PM | #9 | |
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Join Date: May 2010
Location: South California
Posts: 6,188
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Re: Loose cylinder sleeve
Quote:
Glad that you're progressing nicely and getting stronger ! And, thanks also for all your Winfield advice/help, as it's coming together nicely. |
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