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?
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.
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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