Perkins 107/108 oversize rings.

[Bilge]

Has anyone installed oversize rings in these engines and where did you get them ?

[bobconnie]

I have, Google cast Iron engine rings. there are some makers I got mine yrs ago from a supplyer in sacramento cali. Forgot the name now but sure you can find some on line ! remember you will still need to hone the cylinders for straight and for proper clearence Bob and Connie

[Bilge]

Do you remember size over ? What were compression rings..taper,plain,chrome?Did you have to file fit ? And last but not least..how much did they cost ?

[JulianGullsway]

If you havent got it sorted, try parts4engines.com they are an english company that supply nothing but 4108/07 engine parts ans are very resonable, speak to John or Jeremy!

Good Luck;-)

[Bilge]

Thanks,I tried the link but oversize or service ring kit for these engines are not available...if I want to go this route the only way I see is to find gas engine of same bore size and ring dimensions .10 over.

[roverhi]

I've never heard of just going oversize with the rings. Oversize has always meant a rebore of the engine with new larger pistons with rings to match. With wear, the cylinders get out of round and wear so there is a ridge where the rings top out. Need to bore out the cylinders to get rid of the ridge and roundness back which necessitates larger pistons. Also, the ring glands in the pistons wear oversize so reusing the piston in a rebuild is usually a no no.

[Bilge]

My pistons are reusable...cylinders are not worn beyond specs...but need rings to tighten up compression...standard rings aren't enough...ring makers used to have re-ring kits but no more...hone & os rings will work for cheap & adequate fix.