Tuesday, 15 October 2013

Engine building 2: pistons

Machined, balanced rods.



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New standard pistons. Rings have been checked in the bores by the machine shop.


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Assembly lube, slide the gudgeon pin in with the piston forward and the rod numbers on the exhaust side. Put the circlips smooth (not sharp cut) side IN. Check for positive seating by rotating clips with the circlip pliers. Leave the circlips pointing down.


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 Lay out assembled rods in order.


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Insert bearings. 


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All in. 


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Set the engine at #1 TDC. Set the dizzy drive at 10 to 4 with the big D up. Tap the crank dizzy drive in until it just contacts the brass cog. Rotate the brass cog back 3 teeth (same as the width of the crank drive) and then slowly tap the crank drive home. This will put the dizzy drive properly back to 10 to 4 with the big D up at TDC. EASY!!


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