Petter W1H Piston
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Petter W1H Piston
Hi Guys!
I am in the process of restoring a Petter W1H engine. Before removing the head and barrel the engine would run with some oil added around the piston but had very high crankcase pressure. I was surprised to find the cylinder in good condition,but the piston had signs of been cleaned up with emery cloth or similar. I suspect that this was a seized motor from standing and the wrong piston has been added. The cylinder barrel is 85mm (3.3315") the piston 84.95mm (3.32") giving about .007 thou piston clearance which seems a bit excessive to me. Basically this engine looks identical to the the Petter A1 with a water hopper on top, but the A1 has a different size bore of 3.149". So does anyone know of any other Petter model that uses the 85mm (3.3315") bore so that I can source a replacement piston as I can't find any specs for the W1H. Any info will be appreciated.
Cheers, Rad.
I am in the process of restoring a Petter W1H engine. Before removing the head and barrel the engine would run with some oil added around the piston but had very high crankcase pressure. I was surprised to find the cylinder in good condition,but the piston had signs of been cleaned up with emery cloth or similar. I suspect that this was a seized motor from standing and the wrong piston has been added. The cylinder barrel is 85mm (3.3315") the piston 84.95mm (3.32") giving about .007 thou piston clearance which seems a bit excessive to me. Basically this engine looks identical to the the Petter A1 with a water hopper on top, but the A1 has a different size bore of 3.149". So does anyone know of any other Petter model that uses the 85mm (3.3315") bore so that I can source a replacement piston as I can't find any specs for the W1H. Any info will be appreciated.
Cheers, Rad.
Rad- Posts : 2
Join date : 2014-06-14
Age : 72
Location : South Shropshire
Re: Petter W1H Piston
I have an alloy piston from a Petter A1. It is 3.325" diameter. Send me a message if you are interested in it.
Used alloy pistons nearly always show some vertical score marks on the piston sides.
Used alloy pistons nearly always show some vertical score marks on the piston sides.
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blue cat
blue cat- Life Member
- Posts : 1035
Join date : 2013-10-10
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