[Vwdiesel] Piston selection--- (when reboring or re-ringing)slatersfb at aol.com slatersfb at aol.com
Tue Apr 12 12:58:25 EDT 2005
Checking piston fit with feeler gauge might take a lifetime to learn. Piston & bore are round, while gauge is flat. Also the thicker the gauge, the less it flexes to conform to gap between piston & cylinder wall. Bore gauge is the way to go & large mic for pistone. Truth be told, pistons in my Jetta are so loose they slap under load & have for the last 50k miles. No oil use though. Never had any problems caused by loose piston fit in any engine. A little noisey maybe is all. Bob *********** Loren pointed out to me that my way of checking piston fit was near impossible to do. Simple really --- I did not explain it right. I learned this procedure from a mechanic at Finning Tractor Van.BC. Clean bore --clean Piston NO RINGS or pin. Long feeler gauge blades about 12 " american inches. With a 5 thou blade in cylinder and piston slides right through --on its own weight ? NO good for a diesel VW. You need a bigger piston------ well you DIY's gets the drift ?---if NOT ?. Leave it ALL to a good shop. ----BUT make sure you tell them to fit on the THIGHT side of specks.
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