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piston pin snap rings

  • Thread starter Thread starter Spud's Dad
  • Start date Start date
S

Spud's Dad

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I'm replacing the rings on my GS550m but wasn't planning on removing the pistons from the con rods. Should I replace the piston pin snap rings anyway while the head is off?
 
However, if you do take them off, don't re-use them. They're a one-use-only type of flimsy design.
 
Yes, replace them if you remove the pistons. If not, leave them.

In fact, I'd say you'll want to go ahead and remove the dang pistons -- it's much easier to clean them properly off the engine. The snap rings are really cheap.

In fact, you could technically get away with only replacing four (how's that for epically cheap?) -- you only have to remove one snap ring to get a piston pin out.
 
Bear in mind that if they've been off before someone could have reused old ones or made a mess fitting replacements so they are worth checking out to see thay are sitting in there properly.
 
be aware that the pins may act like there welded to the con rods...seen it many times.
very few just push out with your finger and may require a pin puller.
 
I've never had any issues or had to resort to pullers to remove piston gudgeon pins, with the circlip removed, a cloth wrapped around the piston soaked in VERY hot water will expand the aluminium and provide enough clearance for the gudgeon pin to slide out with being pushed with a hand based digit;
?1 of false economy versus a another new gasket set, rebore, new pistons and rings, new gudgeon pin circlips, time and effort; methinks the choice is clear, I'd fit new circlips without a shadow of doubt.
 
They were my thoughts also on false economy and as luck would have it I have a spare 8 or so "hand based digits" pending the need for cranial stimulation due to cognitive discord from a stuck pin. :-)
 
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