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Author Topic:   Wearing out distributor gears
34Racing
Dirt Forum Racer

Total posts: 97
posted April 20, 2003 01:59 PM
How can I check to see if the distributor gear and the cam gear are meshing right? My distributor gear seems to be wearing to fast. Heads on the motor were shaved so I know that the intake has to be sitting lower than a stock motor. But what is the proper height for the distributor?

Thanks 34Racing

hamer36
Dirt Full Roller

Total posts: 61
posted April 20, 2003 05:19 PM
there should be some up/down play in the distributor. if not they sell shims that go under the dist.

TRM38
Dirt Full Roller

Total posts: 42
posted April 22, 2003 01:11 AM
My engine builder says that too much oil pressure will cause excessive distributor gear wear as well.

c21
Dirt Freak

Total posts: 346
posted April 22, 2003 05:20 PM
I've chased this problem in the past.

assuming your distributor/gear is set in the correct depth and your oil pump is not putting too much of a load on the drive gear (and you observed reasonable precautions during break-in) you should be OK...

.... however, cutting a verticle slot in the distributor body (where it passes through the lower side of the lifter oil galley) directly above where the cam and dist gears begin to engage each other .... can help a bit by providing additional lubrication.


For my own motors, I changed to Bronze gears 2 or 3 years ago and have not had this problem since.

c21

34Racing
Dirt Forum Racer

Total posts: 97
posted April 23, 2003 07:41 PM
Thanks for the replys everyone. I might end up trying a bronze gear.

34Racing

SLEEPY GOMEZ
Dirt Maniac

Total posts: 199
posted April 23, 2003 09:56 PM
Check out Comp Cams new composite gear. It is nylon filled with carbon fiber I think. They told me it would hold up under the load of a magneto. Not sure about the price but it sure looked good. It is light too. Good for reducing front weight???
SLEEPY

Monster
Dirt Maniac

Total posts: 135
posted April 23, 2003 10:00 PM
It'll set you back only $99.99!

ModMan43
Dirt Full Roller

Total posts: 45
posted April 25, 2003 04:22 PM
I had the same problem and couldn't figure it out for a while. I was even wearing out the Bronze gear. Come to find out the cam was walking back and forth on me. I put a cam button in by the timing chain cover and haven't had a problem since. Good luck.


SLEEPY GOMEZ
Dirt Maniac

Total posts: 199
posted April 26, 2003 01:15 AM
Jeeeezee, I don't pay $100 for my whole distributor! SLEEPY

dirtracer14
Dirt Freak

Total posts: 499
posted April 27, 2003 12:27 AM UIN: 23443678
I can also add that if you wore out one gear on a cam and didnt replace the cam and just put a new gear on it......it will keep wearing the dist gear out from the wear on the cam. I ended up going with a button last year to keep cam walk down!! this was with a flat tappet

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