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Joined: Nov 2008
Posts: 322
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Nov 2008
Posts: 322 |
I have my oil pan off and am checking the clearances on the '28 motor in my '26 Touring. I'm replacing one bad rod. My question is about piston allignment. I notice that three of the pistons have the slot toward the cam, one is opposite, Doing a search I discovered that not all the manuals agree on the proper orientation. What is the consensus on which is correct? Should I change them at this point or does it really matter? On what side should the pin lock bolt be? Tkanks.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The T slot goes to the camshaft side. The "other" side of the piston takes the side thrust.
Gene Schneider
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Joined: May 2002
Posts: 1,213 Likes: 1
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: May 2002
Posts: 1,213 Likes: 1 |
The thrust side of the cylinder bore is the camshaft side of the block.If the "T" slot in the pistons are installed facing the camshaft,all 4 pistons will "rattle",as when the piston goes down on the power stroke,the side with the "T" slot will try to close up.The side of the piston with the expansion slot should face the carburettor side of the block.The service bulletins have the necessary info in them.
CJP'S 29
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The above is correct.....I was up-side-down> 
Gene Schneider
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Joined: May 2002
Posts: 1,213 Likes: 1
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: May 2002
Posts: 1,213 Likes: 1 |
I'm upside down-down under 
CJP'S 29
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Joined: Nov 2008
Posts: 322
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Nov 2008
Posts: 322 |
Actually I was wrong too. The slots really are opposite the cam side on all four so they must be correct. I'ts confusing when you're lying on your back trying to avoid oil drips.
I managed to get the bad rod out from underneat. You can slide the piston down just enough so there is room to get the pin out. I guess the engineers figured that one out. Luckily I had an extra remanufactured rod and it seems to fit perfectly. The bad rod had pieces of babbit crumbled off from the side so it had about 1/8 inch of side play.
Thanks for the information.
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