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John Deere Tractors Discussion Forum
Show Parts for Model:

JD-H Piston install question

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Neils

03-05-2014 10:49:02
98.238.232.113



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Im installing new rings on my old pistons. All is going smooth until, as I was installing my rings I noticed the seven oil holes in 50% of the piston under the oil ring. #1 piston oil holes are on bottom or lowest 1/2 of the piston and #2 oil holes are on the top or highest 1/2 of the piston.(Pistons are still connected to rods the way they were removed)This leads me to believe someone installed one of the pistons upside down sometime in the past. possibly, this is why #2 cylinder was not in as good of shape as #1. Does anyone know the proper placement of these oil holes under the oil ring? up or down?

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Mike(NEOhio)

03-05-2014 20:49:20
162.40.57.21



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 Re: JD-H Piston install question in reply to Neils, 03-05-2014 10:49:02  
Mine has dimples like punch marks on the rods and caps. Dimples face up,one for left, two for right. Top bolt on each cap is upside down to clear the camshaft.



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Pete in MD

03-05-2014 13:10:21
71.245.164.148



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 Re: JD-H Piston install question in reply to Neils, 03-05-2014 10:49:02  
Your #1 piston is correct. Your #2 piston should be installed like #1. Remove #2 piston from the rod and turn it over.
Look for the marks Mike M mentioned.



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Neils

03-05-2014 13:14:45
98.238.232.113



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 Re: JD-H Piston install question in reply to Pete in MD, 03-05-2014 13:10:21  
Perfect, that's good information, Thanks Pete and Mike!



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Mike M

03-05-2014 11:13:58
24.140.0.120



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 Re: JD-H Piston install question in reply to Neils, 03-05-2014 10:49:02  
The back of the piston skirt is to have a marking "TOP" stamped into them. This is to face up to the top of the block when connecting to the rods. Your rods should ? be marked #1 & #2 and these also are to face to the top. #1 is to be flywheel side.



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Neils

03-05-2014 13:12:39
98.238.232.113



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 Re: JD-H Piston install question in reply to Mike M, 03-05-2014 11:13:58  
Hey Mike M, I gave a careful look at both pistons skirt, Im not seeing any "TOP" marking or stamp, just the part No. "H212R" on both. The rods are marked as follows H800R, CIRCLE "L" No.1 w/21 & No.2 w/11. numerically that would be backward but I did mark them as they came out. Im assuming the holes half way around the piston under the oil ring will go down like the No.1 was originally. The part No. match stock in the book so I wonder why mine don't show "TOP"

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Neils

03-06-2014 07:02:48
98.238.232.113



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 Re: JD-H Piston install question in reply to Neils, 03-05-2014 13:12:39  
Ok, hard to see there, good information. Thank you



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Mike M

03-06-2014 07:22:30
24.140.0.120



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 Re: JD-H Piston install question in reply to Neils, 03-06-2014 07:02:48  
So did you find them there ?



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Mike M

03-06-2014 05:22:58
24.140.0.120



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 Re: JD-H Piston install question in reply to Neils, 03-05-2014 13:12:39  
Look at the flat machined surface clear at the bottom lip like what it sets on if you stand them up on your workbench. It will be at 90* to the way the piston pin goes thru.

IIRC the H212R are the standard size and these are marked on the bottom. Now if they were oversized pistons then Deere usually marked info on them on the top of the piston head.



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