My original motor has the 2 piece fuel pump eccentric. The old cam sprocket has a small raised portion on the front to allow the outer ring to spin when the inner ring is bolted down. My new roller chain sprocket does not have the raised portion and the eccentric bolts down flush, not allowing the outer ring to spin freely. Can I use a spacer underneath the eccentric to provide the clearance, what about the tab length being shortened when using a spacer, will there be enough tab to hold the eccentric in place?? Or do I just look for a 1 piece eccentric? Thanks!

 

I'd go with the single-piece to have peace of mind, but wait for some other people to chime in with their ideas.

 

Hi All,
I seem to have the same issue as the original poster here. I am replacing the timing chain and gear on a 1975 F350 with a 390. Truck sat for a long time before I purchased it, and the radiator let go and was not worth repairing. Since I had that out, I figured I would fix the leaky front cover, and one thing led to another, so now everything is off the front of the motor and being replaced/resealed.

Truck came with the 2-piece eccentric and when I replaced the timing set (Cloyes 3029-x), the two-piece eccentric definitely binds and does not float/rotate like it did on the original set. The new parts did not indicate anything about the type of eccentric needed or accepted. Something seems off and I want to make sure all is good before I put it all back together. (new water pump, radiator, hoses, etc...) I went with the double roller because I figured I would upgrade and now it's a hassle. Manual indicated torque of 40-45 Ft/lbs and I set it at 40...still binding...added some Lucas/oil...still binding...so not sure what to do here. If it matters, the original set did not have a washer behind the cam gear, and neither did the new cam gear...both had the spacer as an integral part of the gear. That much info was in the instructions/package.
The original poster of this thread indicated something about changing to a one-piece eccentric. Can someone share if I need to or how I might do that, pros, cons, etc? A source would be super helpful too if someone knows off the top of their head. I am willing to purchase a different timing set if keeping the two piece eccentric is worth it.
Pics of the situation below.
Any help or advice is appreciated

Original Set before removal

CLOYES C-3029-x

New set without eccentric

New Timing Set installed

New Cam Gear Next To Old

 

You could put a thin hard washer behind it to shim it out some.