What should I do?

[2strokeboy]

I have a 951 di engine but the piston sleeves are rusty. Should I try to reuse them or find another option?

 

[Mraw]

I would get them bored next size up

 

[POPPS]

I would spray a bunch of PB blaster into the cylinders,,,try to spray all parts of the cylinder,,,let it sit a day,,,it dissolves only rust,,,
then I would turn it over,,,,
and finally,,,do a compression test,,i have had submerged skis come in with rust on the cylinders and they run properly after,

 

[2strokeboy]

I would spray a bunch of PB blaster into the cylinders,,,try to spray all parts of the cylinder,,,let it sit a day,,,it dissolves only rust,,,
then I would turn it over,,,,
and finally,,,do a compression test,,i have had submerged skis come in with rust on the cylinders and they run properly after,

should i wipe it up after or leave it

 

[2strokeboy]

mine is actually the whole entire sleeve because it was sitting in a enclosed trailer for many years.

 

[POPPS]

Just take a solvent dipped rag to clean the walls,,,then spray some WD in there,,, apologies,,, thought the motor was complete,,, cylinder head on,,,,

 

[2strokeboy]

Just take a solvent dipped rag to clean the walls,,,then spray some WD in there,,, apologies,,, thought the motor was complete,,, cylinder head on,,,,

No worries. I will try this later today.

 

[Frige]

Get a ball hone and see if they clean up.

 

[2strokeboy]

Get a ball hone and see if they clean up.

will it make the cylinder wall larger and then I will have to get new pistons or not?

 

[Frige]

No a ball hone doesnt take much off. But you do need to mic the cylinders to make sure they are close.

 

[POPPS]

You can,,, clean them up, then put a ring on the cylinder,,,,once near the bottom and one about an inch from the surface, insert the ring using a piston so that it is square in the cylinder.
take a feeler gauge, and measure the ring gap,,, refer to the manual for this,,? If it is within specs, no need for new pistons,,, I usually just replace with new rings.

 

[mikidymac]

It depends on how bad the pitting is. If it is bad the rings will never seal, burn the oil film off and seize the engine.