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Re: Gudgeon Pin Fit
Posted: Sat Aug 03, 2019 12:54 pm
by jack clegg
A modern forged piston should not require heating to fit the pin. Cast pistons, such as the Indian type fitted to Royal Enfields do require heating to fit the pin. Low expansion alloy saves a lot of burnt fingers.
Re: Gudgeon Pin Fit
Posted: Mon Aug 05, 2019 9:00 pm
by 56G80S
At the risk of being derided, if the piston is slack on the gudgeon pin is it possible that the gudgeon pin then operates on the piston and the pin remains semi stationary in the little end?
With adverse consequences?
Johnny B
Re: Gudgeon Pin Fit
Posted: Wed Aug 07, 2019 12:16 pm
by jack clegg
Yes. However all pins move in the piston. It's just that the older/cheaper types have to warm up first. Note the oiling holes in the piston bosses above or below the pin. I had a little end which was tight & the only movement was that in the piston bosses. Not good but it still functioned.
Re: Gudgeon Pin Fit
Posted: Wed Aug 07, 2019 12:49 pm
by bodgert
A lot of modern car engines have the pin captive in the conrod and all movement is in the piston
Re: Gudgeon Pin Fit
Posted: Thu Aug 08, 2019 6:59 am
by Andy51
Not just modern cars. My old '61 Austin A55 had the gudgeon pin clamped in the small end by a pinch bolt. Andy