Yanmar YSE12 cylinder liner

[cindersailor]

I have a Yanmar yse 12 which has been almost completely reconditioned by the previous owner (piston, rings, main bearing, head etc.) however the cylinder liner was not renewed and the engine burns oil, worse when the crankcase oil level is higher. This makes me suspect that it proved impossible to get it out (why replace the piston and not the liner at the same time?). Does anyone have experience of replacing the liner? Access to the head is fairly good and it should be possible to get a puller attached, however engineers I have spoken to cannot guarentee that it will not be an engine out job which is simply not worth it for the age of engine.

 

[salamicollie]

The workshop book mentions a special tool to pull it - I have not tried but it might be possible but the mating face needs to be honed after fitting - would really depend on how much space you have....

In my old installation you couldn't get enough room to remove the rocker cover without levering the engine to stbd

 

[vyv_cox]

Could be worth a DIY honing job. Use one of those flap-type abrasive wheels in a drill, keep moving it axially in the cylinder. Aim is to produce an even matt finish with scratches at an angle to the cylinder axis. Better still it might be worth investing (hiring?) the proper honing tool with stones. All provided that the bore is not too worn, of course.

 

[tr7v8]

Sounds to me like Vyv says that it wasn't glaze busted, either wet and dry and plenty of parrafin or by a glaze buster and use i with an electric drill.
Plenty of lubrication is the key and make sure it's cleaned out well afterwards, DON'T use parrafin to start the cleaning process use hot soapy water!

Jim
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[uforea]

The first thing you need to check is that the baffle plate for the breather system has been fitted the correct way. Ifit has been fitted upside down (which does seem to be the correct way) excess oil and fumes will be forced up the breather pipe and into the inlet manifold. It is also possible that one or more of the piston rings could have been broken during assembly as it is quite an awkward job to do in-situ.

 

[toad]

I removed one some years ago even with the engine on a hydraulic press it was hard going,when removed corrosion made the engine scrap.To do the job in situ you would need about ten inches clearance between the block and boat.

 

[Starspinner]

Try the chap at Cellar Marine at Helston Cornwall, He is a mine of info and has all the bits

 

[lauradee]

hang on a bit

to replace the piston he must have had access to the big end, which means sump off!!
can you take the sump off in situ? if not do the engine mounting nuts and bolts show signs of having been moved?
if not someones telling porkies and the engine hasnt been moved and you have a s*****d engine.
go back to basics and work it out !!
if it is possible that parts have been changed then something hasnt been done properly and engine out time again, and if engine hasnt been out then its still engine out time!! and if you need to "deglaze the bore" or change the liner (do they have liners?) its still engine out time.
engineers? if you cannot take sump off in situ YOU HAVE TO REMOVE ENGINE TO REMOVE SUMP
stu

 

[toad]

Re: hang on a bit

Its a horizontal engine,head one side crankcase other side.

 

[Starspinner]

It sounds similar to the YSM8. If you have access to both sides of the engine it is possible to do the work in situ. But in my case the liner had to be shocked to start the initial move, very difficult whilst making sure nothing else gets broken. The other problem is that the liner seating top AND bottom need to be scrupulousy cleaned or you get water and oil mixing. Advise removing engine.