Bad pistions on 94 buick centry 3.1l think engion stamp is g dont know if i have to put just pision in or rod assambly
It's rare that a piston goes bad. So, you need to determine why it failed.
Most times, the cylinder wall is damaged during a piston failure making it impossible to just replace the piston. Check the wall for score marks and out of round condition as well as actual size VS original bore size. (correcting that requires machine work) The new piston must match the cylinder bore as it is now, NOT what it was when manufactured. (same applies to rings).
The old rod can be re-used if it is not bent and providing that the big end (crank end) is still round. Again, the rod needs to be assembled by a machine shop as the wrist-pin is a press-in part.
Most times, you will find that the amount of actual work necessary to replace one piston exceeds what would be necessary to replace the engine in both time, $ and reliability.
If you want to try a replacement though, see if you can get a piston/rod assembly that is still in good condition from a blown junkyard engine, Plasti-gage the bearing and replace if necessary, clean out the ring grooves or replace the rings. Use a hand held cylinder hone and break the glaze on the cylinder walls. If you are careful and everything goes well, it MIGHT work.
Personally I would never replace pistons in an engine without doing all the necessary machine work though.
Aug 22, 2011 |
Buick Century Cars & Trucks