YM 2210B Valve Timing Off???

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pxmntws
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Re: YM 2210B Valve Timing Off???

Postby pxmntws » Tue Oct 11, 2016 12:25 am

After measuring here is what I have found
Cylinder Bore 3.5435 to 3.539 the small dimension is at the very bottom where there is no ring wear.
New pistons 3.5385 measured at the bottom of the skirt.
Old pistons 3.532 measured at the bottom of the skirt.
Crank shaft rod journals 2.124
Rod bearings measured in rod torqued to 35 Foot pounds 2.127-2.126

Here is my concern bore versus new piston not much clearance like one thousand of an inch, seems to tight. I checked this many times, I zeroed bore gage to the micrometer set at the piston diameter. Both cylinders are very close to the same. Below please see attached pictures of crank shaft, scratches I can see but can't feel with my fingers?
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winston
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Re: YM 2210B Valve Timing Off???

Postby winston » Tue Oct 11, 2016 5:15 am

Comment some on what you see on the rod bearings. The pictures are hard for us to tell much about. Pictures of crank look fine to me. Your clearance there seems to be ok.

Can you see any evidence of the pistons trying to seize in the cylinder? Do the old pistons look to be worn that much? Your readings would indicate this might be your seizing point.

Did you bother to check ring end gap?

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Re: YM 2210B Valve Timing Off???

Postby Aaron » Tue Oct 11, 2016 7:47 am

All of your dimensions (except your old piston) are well within spec.

pxmntws
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Re: YM 2210B Valve Timing Off???

Postby pxmntws » Tue Oct 11, 2016 8:46 am

I took the top ring off one piston and checked as per manual the gap was almost 1/8 of an inch as I recall .120 using a feeler gage I decided the manual must be incorrect maybe off a decimal point, this was about half way down the cylinder.

As for old piston at the bottom of the skirt showed no signs of scoring, but the piston defiantly could be deformed I am assuming that I did this the last time it was running getting out of some deep mud.
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Re: YM 2210B Valve Timing Off???

Postby Aaron » Tue Oct 11, 2016 8:59 am

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pxmntws
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Re: YM 2210B Valve Timing Off???

Postby pxmntws » Tue Oct 11, 2016 9:39 am

I compared old and new both are around .120 please see attachment. I do not have a feeler gage that big so I had to stack them up.

I am thinking of honing the cylinder trying to get .003 or .004 clearance up and down the cylinder what do you guys think. Thanks again for the help.
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Re: YM 2210B Valve Timing Off???

Postby Aaron » Tue Oct 11, 2016 9:51 am

I compared old and new both are around .120 please see attachment. I do not have a feeler gage that big so I had to stack them up.


:shock: That is a lot of ring gap. I think you are off a decimal place. Should be 0.0118". See post above.

pxmntws
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Re: YM 2210B Valve Timing Off???

Postby pxmntws » Tue Oct 11, 2016 11:00 am

I decided the manual must be incorrect maybe off a decimal point, gap is obviously bigger .0118 on both sets off rings.

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Re: YM 2210B Valve Timing Off???

Postby Aaron » Tue Oct 11, 2016 11:23 am

The manual is correct.

winston
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Re: YM 2210B Valve Timing Off???

Postby winston » Tue Oct 11, 2016 12:24 pm

Aaron wrote:The manual is correct.



Yep!

Aaron, his readings show the piston to only have .001" clearance on the skirt. Comment on that.

winston
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Re: YM 2210B Valve Timing Off???

Postby winston » Tue Oct 11, 2016 12:25 pm

winston wrote:
Aaron wrote:The manual is correct.



Yep!

Aaron, his readings show the piston to only have .001" clearance on the skirt. Comment on that?

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Re: YM 2210B Valve Timing Off???

Postby Aaron » Tue Oct 11, 2016 1:01 pm

3.5435 - 3.5385 = 0.005" which is perfect.
EDIT... oops... didn't see the part about the bottom of the liner being 3.539". That is 0.004" too tight according to the manual. Could the liner be out of round?

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winston
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Re: YM 2210B Valve Timing Off???

Postby winston » Wed Oct 12, 2016 4:32 am

pxmntws, maybe double check your cylinder measurements. You are showing it to be out of round by .0045". Did you check both cylinders?

pxmntws
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Re: YM 2210B Valve Timing Off???

Postby pxmntws » Wed Oct 12, 2016 8:25 am

I have checked this multiple times, liners seem to tight in the bottom of the cylinder, when the tractor was running it acted like it was tight cylinders because it would loosen up in 30 minutes or so and start up again. I think pistons would expand from heat very quickly and retract in a cool cylinder. Yesterday I ordered new liners fabricated a puller and removed old liners. Don't know what else to do.

Thanks all.

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Re: YM 2210B Valve Timing Off???

Postby Aaron » Wed Oct 12, 2016 12:58 pm

Don't know what else to do.


You will also need new rings if they were gapped to 0.120"


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