rebuilding motor: ring problem

[blue87lx]

im putting new rings on my motor and they all fit except the oil rings. i replaced one piston and the rings fit fine but on the original piston the oil rings wont fit in the groove enough to get the piston in the cylinder. whats wrong. i double checked and the rigs are correct for the motor. and nothing is bored or oversized.

 

[2002BLGT]

im putting new rings on my motor and they all fit except the oil rings. i replaced one piston and the rings fit fine but on the original piston the oil rings wont fit in the groove enough to get the piston in the cylinder. whats wrong. i double checked and the rigs are correct for the motor. and nothing is bored or oversized.

I would replace all the pistons IMO.........

 

[ECU5.0]

i ran into the same problem. i got three different sets from summit and they were all wrong. so i just got new pistons and rings from my machine shop

 

[vristang]

im putting new rings on my motor and they all fit except the oil rings. i replaced one piston and the rings fit fine but on the original piston the oil rings wont fit in the groove enough to get the piston in the cylinder. whats wrong. i double checked and the rigs are correct for the motor. and nothing is bored or oversized.

I am not trying to be a smartass, but are you using a ring compressor?

Other than that...
It sounds like the outer diameter of the ring is too large.
Is the ring end gap good?


jason

 

[ECU5.0]

from what in understand, the ring is too wide to fit into the groove. thats what happened with mine anyways

 

[blue87lx]

thats what it looks like. like the inside diameter of the ring is to small but it worked on the new piston

 

[Wicked_306]

Mine were like that too with new Keith blak pisotns and sealed power rings. I just had a friend squeeze the compressor really tight to get them in there, while i taped them in. They are suppose to fit reallly snug.

 

[BlackBaer5.0]

I did a block assembly last week and if it wasnt for a little advise from the machine shop I would have ran into the same problem.

there are several rings sizes/part numbers that show up for 87-91 50 HO blocks,

For the forged pistons the ring width is metric and the Hyerpueretic (sp?) piston they are standard sizes..
I think the forged piston rings are 1.5 mm // 1.5mm and 2mm I was pretty tired when i put it together friday

I used a sealed Power/ federal mogual ring set,
I hope this helps ..