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Author Topic:   MSD Distributor gear wore out.
vosevichs
Dirt Forum Racer

Total posts: 78
posted May 18, 2005 11:27 AM  
Hey you Motor Heads, Can you enlighten me?Freshened SBC 355 w/ new cam. MSD Dist. with bronze gear(not new). Dist. Shimmed.
The dist. gear wore out to a point where I think it skipped a tooth. You can see the dist. gear was meshing in the center but it's wore bad like half way in. Do these bronze gears just wear out. Or is this a proplem. I've never seen the regular gears wear like this.
Thanks

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Scott Vosevich
RDBoyz Racing

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted May 18, 2005 11:46 AM  
They will eventually wear, that is the idea behind the bronze is that it will wear before the cam gear. If the gear wasnt new, it could have had an unusual pattern to start with and didnt mesh right with the new cam and now has accelerated wear.

Is the new cam a roller?

ARe you running really high oil pressure that can put a high load on the gears.

Is the new cam a comp cam?
Last year it seemed lik Comp Cams was having trouble with there flat tappet cams eating up MSD gears. Swithched to GM iron gear and it has been fine since. I dont know whether that would affect your bronze gear or not.

vosevichs
Dirt Forum Racer

Total posts: 78
posted May 18, 2005 12:15 PM  
That's what I'm hoping, Old gear, new cam. Replace gear problem solved.
No not roller, Solid lifter cam.
A new oil pump, no HP or HV 20-50 VR-1 Valvoline oil I'd hate to have that pump screwing up.
The cam is one of those engine builder super secret cams. I don't know where he bought it. Maybe I can pry the manufacture's name out of him.
Thanks Dirtbuster

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Scott Vosevich
RDBoyz Racing

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted May 18, 2005 12:35 PM  
If its a solid cam you shouldnt need the bronze gear. Id just get a new iron gear and go with that. Look down inside the hole at the cam gear and make sure its not all chewed up though.

vosevichs
Dirt Forum Racer

Total posts: 78
posted May 18, 2005 01:54 PM  
Yea the cam gear is fine. Our back-up dist has the metal gear. That's in it now. Isn't that bronze gear larger? What's the type of camshaft have to do with what gear I use?

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Scott Vosevich
RDBoyz Racing

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted May 18, 2005 02:04 PM  
Typically you only need the bronze gear on roller cams because of the material they are made of. Most flat tappet cams should be fine with the iron gear and it should wear longer.

autoshop
Dirt Freak

Total posts: 298
posted May 18, 2005 03:13 PM  
I would check and make sure the cam is not walking back and forth, The other thing is when you start the engine cold don't rev the motor up and down until the oil is warm, I keep it at one steady speed until the water temp it 140 or better. One other thing do you use any kind of moly lube on the gear when you install it every time,if you install it dry that may cause the wear too.

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted May 18, 2005 03:28 PM  
Ditto on the cam walk....if you put the steel gear in and it was to much walk then it will eat both the cam gear and the dist gear (with the bronze it will just wear the bronze). I had this problem a few years back...got about 3 races then the gear broke...i put a cam button in the front and no problem since. This was a flat tappet cam.

mdsteacher
Dirt Maniac

Total posts: 145
posted May 18, 2005 04:54 PM  
We've used the bronze gear on a flap tappet cam the past couple of seasons without any wear or issues at all. We checked the distributor gear about every 6 races and for two years saw little to no wear.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted May 19, 2005 08:58 AM  
I didnt mean that you cant use the bronze gear on the flat tappet cam, or that using a bronze gear would cause the problem, UNLESS the used bronze gear was worn in a odd pattern to start with and didnt mesh good with the new cam. I only meant that it is not absolutely necessary to use the bronze like it would be with a roller cam.

mdsteacher
Dirt Maniac

Total posts: 145
posted May 19, 2005 01:27 PM  
Yeh, I know, but thought I'd post that it is OK to use one as well.

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