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Old 15-12-2009, 11:38   #1
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Yanmar Cylinder Liners

Anyone out there ever replaced a cyl liner in a small yanmar[3gm]? Am wondering if I can handle it .Main question is how tight they are in block.Am thinking I could fashion a puller if they aren't too tight.I'm replacing all pistons and rings and after cleaning up with stone hone I can see some wear spots. They aren't real bad and I may wait till rings and pistons get here and I can measure clearances.I thought in the meantime I would check on replacing liners. Thanks all
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Old 17-12-2009, 06:00   #2
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Hey there,

Yes the liners are tight but you possibly can use a puller to pull them out. You must be a real skilled guy if you're doing this job by yourself by the way

I can supply you the service manual of your engine but the file is 15,1 megabytes. Maybe you can find the manual online.
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Old 17-12-2009, 10:46   #3
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Old 17-12-2009, 11:31   #4
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Anyone out there ever replaced a cyl liner in a small yanmar[3gm]? Am wondering if I can handle it .Main question is how tight they are in block.Am thinking I could fashion a puller if they aren't too tight.I'm replacing all pistons and rings and after cleaning up with stone hone I can see some wear spots. They aren't real bad and I may wait till rings and pistons get here and I can measure clearances.I thought in the meantime I would check on replacing liners. Thanks all

Is the engine block out of the boat? Flip it over and tap them out with a block of hardwood and a hammer. I'd mic out the liners but as long as you're that deep and replacing pistons and rings I'd replace the liners. Not that much more in cost as long as you're doing it yourself.
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Old 17-12-2009, 11:31   #5
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Taper

One of the main things you want to check is taper of the liner. The difference between the wear in the top and bottom of the liner. Use an old ring, push it in with a piston to make sure it is square in the liner. Using a feeler guage, measure the gap at the top and bottom of the liner. Somewhere in the manual, you will find a spec for the maximum amount of taper.
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Old 17-12-2009, 13:29   #6
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I did it recently on my YSM8R and it wasn't to bad a job. I DO have a small machine shop so my ability to make tools is a bit higher than a lot of folks.

I made a puller from 2 pieces of steel bar stock and a length of 3/4" threaded rod. The piece in the bottom of the sleave mated closely with the bottom edges of the cylinder and the top piece spanned the head bolts. I tightened a nut on the rod at the top and the bottom block forced the sleave out.

Putting the sleave back in is a bit more work. Once everything is out of the block you must clean all the water passages you can get at very well to be rid of all the built up crud.

Once clean and ready for insertion lube the orings with heavy grease, align the sleave as closely as you can and use a large rubber mallet to(gently?) bump the sleave into place. You MUST be sure the sleave is seated correctly to the correct depth or the head will never seal properly. Your manual should give you the specs.

I used a vacuum cleaner(wet/dry threw away hose afterwards) to get all the scaped off crud out of the block before putting the sleave in. Fair warning: Do not even think of reusing the clothes that you do this job in as they will transfer black diesel sooty oil to all your possesions for yards in all directions. A couple of tyvec suits would be a good investment.

Good luck, go slowly, follow the manual, and its not that bad of a job and certainly beats the heck out of the cost of a new motor........m
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Old 17-12-2009, 15:17   #7
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Anyone out there ever replaced a cyl liner in a small yanmar[3gm]? Am wondering if I can handle it .Main question is how tight they are in block.Am thinking I could fashion a puller if they aren't too tight.I'm replacing all pistons and rings and after cleaning up with stone hone I can see some wear spots. They aren't real bad and I may wait till rings and pistons get here and I can measure clearances.I thought in the meantime I would check on replacing liners. Thanks all
I helped a friend pull out the liners of a 3 cyllinder Yanmar while at anchor in Chesapeake Bay. Since we were also replacing pistons/rings, we used an old piston with one ring as the puller. We drilled a hole in the center of the piston and attached a threaded rod. We put the piston in the liner upside down and pushed it gently to the bottom until the ring clicked open at the bottom of the liner. Next we attached a bar to the threaded rod on top of the block and pulled the liners out. Using this method we didn't need to remove the block to pull out the liners. The expanded ring was just right to grab the liner and pull it out without touching the block. Good luck...you can do it.
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Old 18-12-2009, 09:08   #8
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Thanks to all for the replies.The engine is out of the boat.I have a service manual [clymer] so I have the specs.Cantexsalior-what you did was what I was thinking of doing until I read Svcattales idea. It seems like it would work better for me as I dont want to pull crank [I even have a piston that is broken off below rings!].I think I can handle this as I have been a mechanic for 42 years and have fabricated alot of stuff over the years. I again thank all for your replies Mark
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Old 18-12-2009, 11:18   #9
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Boy that was alot of worry over nothing!!!!! Flipped eng. over and barely tapped on liners and they came right out -didn't see any o rings in grove at top of liner like I expected though. Thanks again all Mark
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