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piston clearance and other tips for your P 1800


Good stuff. thanks

I dont know brand of piston. I googled markings and nothing came up. They are marked as 030 so i assume they are 30 thou over std.

The ring side clearances with the new rings all measured between 1.5 and 2 thou. The new rings are cast iron. I am a little worried about the ring gap; around 022-028. They are +030 rings but the bore being about 003-004 over that has opened the ring gap. I went ahead at this point and used them.

The cam is relatively new as i replaced the cam and lifters a couple years ago.

Good thought on the o rings. i will look into that.

I decided to replace all the bearings with aluminum. The copper was starting to show on a couple of the crank bearings.

I used new bolt locks on the cam shaft plate. Also checked that i have about 3 thou difference between the ring and the camshaft plate.

I have assembled everything except the lifters, pushrods, and rockers. It takes about 15 ft-lbs to get the thing turning and around 5-10 ft-lbs to keep it moving. Considering that i liberally used assembly grease, i figure this seems acceptable. If anyone has other advice, happy to get it.

thanks for the feedback

dean






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New piston clearance [1800]
posted by  MrV  on Wed Dec 16 09:43 CST 2020 >


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