Cylinder base oil leaks
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George Ryals
- Posts: 510
- Joined: Tue Aug 03, 2010 10:22 am
- Location: Stone Mountain, GA
Re: Cylinder base oil leaks
You don't put the sealing compound ON the o-rings or in the grooves that any of the 3 o-rings fit into. The compound only goes on the metal to metal surfaces. The sealant layer should be about as thick as onion skin...as thin as you can get it and it still be there.
Smile it's contagious!
'74 R90S, '67 /2 Conv w/sc, '66 R50/2
'74 Harley FXE, '72 Harley FLH w/HD sc
'69 BSA 441 Victor Special, '74 R90/6 Basket case
'85 R80RT wreck for parts
'74 R90S, '67 /2 Conv w/sc, '66 R50/2
'74 Harley FXE, '72 Harley FLH w/HD sc
'69 BSA 441 Victor Special, '74 R90/6 Basket case
'85 R80RT wreck for parts
Re: Cylinder base oil leaks
I've tried the Yamabond, 3 Bond, the this, that and the other thing. Best sealer I've found was Permatex Sealer, it's brownish and stinky! A machinist insisted this was the only thing they used on aircraft engines...But what sold me was he used it on his racing BSA and no leaks? NO LEAKS? I saw it for myself!
The liter boxer's are notorious for seeping around the cylinder base. My 78S is dry, even after a hard run. Preparation is most important. Assure all surfaces are extremely clean, wipe down with denatured alcohol...use surgical gloves, make it clean! Use your fingers to smear just enough to make a thin film on both surfaces....Wait about 15 min. When it's tacky, use your fingertip to create a bit of roughness along the surfaces...Ease the jugs onto the engine case and bolt em' down.
Oh yeah, always replace the little O rings around the top studs, and either replace the pushrod tube seals or clean, inspect, and apply a film of silicon grease inside and outside the seals before installation.
The liter boxer's are notorious for seeping around the cylinder base. My 78S is dry, even after a hard run. Preparation is most important. Assure all surfaces are extremely clean, wipe down with denatured alcohol...use surgical gloves, make it clean! Use your fingers to smear just enough to make a thin film on both surfaces....Wait about 15 min. When it's tacky, use your fingertip to create a bit of roughness along the surfaces...Ease the jugs onto the engine case and bolt em' down.
Oh yeah, always replace the little O rings around the top studs, and either replace the pushrod tube seals or clean, inspect, and apply a film of silicon grease inside and outside the seals before installation.
Re: Cylinder base oil leaks
Problem solved - the o ring got mashed during assembly. From the look of it, it somehow got tangled up around the exposed threads on the stud.