435 fuel pump

sm420

New User
I am replacing seals on the 435 fuel pump and the manual says when assembling pump halves us reputable sealer, would copper coat gasket compound work OK ?
 
I've lost a lot of faith in copper coat.

That might be a good spot for that Yamaha sealant they use to seal the crankcase halves together ?
 
I remember the manual said to use some sort of sealer,
but we never did, because the surfaces of those two halves
are supposed to be lapped.
We used a lapping board or if one was not available a 8x11-?
sheet of fine crocus cloth on a flat surface.
The goal was to get the two halves as clean as possible.
MikeS.
 
From memory, I believe Indian head shellac was commonly used in this type of application, the letter series Deere hydraulic pump faces were sealed the same way.
 

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