cylinder sleeves

[wooddude-HT]

Hi!
I have recently bought from hoye tractor a set of three cylinder liners. I have installed them and they seat well except that the tops of the liners stick above the block slightly. When I tapped the sleeves in carefully with a piece of wood on top I could feel when they bottomed out (there is a lip at top edge) I hesitate to put any more dowmward pressure on sleeve.
M question is this: does the sleeve stick above the block slightly?
this is bothering me a lot!
THANK YOU!!

 

[Aaron-HT]

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Yes. 0.003 - 0.006"

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[winston-HT]

Curious on what model tractor you have <E>:?:</E>

 

[Aaron-HT]

Oops... I was working with another guy at the same time with transmission issues on a YM240 and still had YM240 on the brain I guess. I see now that wooddude bought 3 liners so, unless he bought a spare, rules out the 240 <E></E>

I think they will all have some projection but,Winston is right (as usual) and we will need the model to be sure how much.

 

[wooddude-HT]

Hi!
The engine is a 1980 - 3T80J 3cylinder Yanmar in a John deere 850
The cylinder sleeves are above the block at least 20 thousandths.
I hope I do not have to remove the new pistons and take out liners!
THANKS!!

 

[winston-HT]

.020" doesn't sound right to me. For what it is worth the 3t75ha engine found in the Yanmar 220/226 manual shows.0002" to .0029". I believe the .0002" is a misprint and should be .002". Reason why is because the Yanmar 276 manual (3t84ha) shows .002" to .003". Neither of those is close to .020". Might consider calling your local John Deere dealership and asking them. I see no reason a good dealershop wouldn't share that info.

 

[wooddude-HT]

It might be worthwhile to post how it came about that I am rebuilding this engine.
I had been looking for a Yanmar tractor near this size when I found this 1980 John Deere 850 with a scored main bearing from the previous owner. Since the price was only $2,500 for it, I thought after fixing the engine I would save money. ( decent running JD850 running tractors around here sell for about $10,000 + -)
Besides, I would have a new motor. It turns out that what blew the crank bearing was that the head had developed a small crack in no# 1 cylinder and when water was admitted to the cylinder, the compression was increased dramatically, resulting in far more pressure being put on the rod and crank bearings and eventually scored the bearing. So the moral of this story is to take seriously any overheating problems and head/valve problems.
The head was so wasted I ended up just buying a new one. So, now I have a new crank, bearings,rods, pistons, liners, and head. as well as other stuff around it (hoses, oil sender, temp sensor,etc) I am OK with doing all this work as I am hoping to have an engine I won't have to tear apart again. Besides, rebuilding an engine has always been on my bucket list anyway.
Hope this can help others!
wooddude

 

[winston-HT]

Assuming nothing has been milled off the top of the block? Out of curiosity I am going to call John Deere and ask them for those specs. All they can do is say no. I will get back.

I'm back, haven't heard from John Deere yet but found a manual. See page 20-10-4 for .002" to .005"
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Manual does say excessive height may be due to rust build up on shoulder in block.

 

[wooddude-HT]

Thank you Winston and Aaron!
I will measure the gap at top of the cyl. sleeve just to make sure. I suspect I will need to pull out the pistons and liners and reclean at the lip of the liners, oh well, I have not rebuilt a motor before and I suppose it is just a normal part of learning. I hope I can reuse the two O rings over again.
Thanks again!

 

[wooddude-HT]

Hi again!
I think I might have gotten off a little easy on the cylinder liners. I just took everyones advice and checked with the local John Deere dealer and it was confirmed that .002-.005 is max. What I did was take the old head and use it (without gasket) to push on the liners. I just took off the head and the gap is less than .004 on all sleeves. Whew! Since the head is going to be replaced anyway, I am going to put the old head back on and leave it until new head arrives, maybe it will help seat the liners more thoroughly.
Thanks to you both I was worried about it!

 

[wooddude-HT]

Thank you Winston&lt;
I agree. I called up my local John Deere dealer and they said exactly the same .002-.005
Thank you, it is a relief to not have to tear the engine down!