9N cam gear

Replaced with Aluminum gear as fiber gear sheared the teeth. Customer now says that it does not have the power that it used to. Am I over looking something? I have payed with the timeing but not helping much. Thanks

Icuby, I work the company that makes those cam gears. The part number (industry P/N) on the old fiber gear was 2703 and I’m pretty sure it’s obsolete; I had to look back at a ’67 catalog to find it. The Aluminum cam is 4706. The only thing the gears can do is change the crank to cam timing. Looking at the drawings, both the fiber and aluminum gears are made with the same timing angle, so the engine should see zero difference. Perhaps the old fiber cam gear was severely worn? If the camshaft were to be slightly retarded it might make the engine develop a little more high speed power. Conversely, advancing the cam would increase low speed power. However, it usually takes a crank degree or more to see any effect. There’s 22/44 teeth on that gear set. If ½ the cam gear tooth was worn away that would give you about 2 crank degrees retard … that might be noticeable, but I doubt it. My 2 cents, -Jeff

So here's the problem you repaired a engine you have never worked before so you don't know how it ran before it failed.. There was no way to confirm it the cam timing was out of wack... Now the customer is not happy and you have his money so you need to confirm your work... The big issue you will face is finding TDC.. If you can find TDC #1 and confirm valve overlap on #4 you can confirm if you timed it correct...

On a re-do you loose your arse I sure nuff will spend the time to confirm If I need to do a RE-DO and acept the loss... The timing on a N is no different than anything else other than their is a curve ball involved that may make you swing and miss...

I take it you are a Mechanic... :?: You stated Customer SO I take it you wrench for $$$...

I take it you have checked the basics so tell me what they are...

Before I go farther do you under stand valve over lap are if I said on the rock ...

If you understand were the valves should be on the middle cylinder of the firing order when #1 cylinder is is at TDC you can time most any engine no timing marks needed... This will also confirm if the crank and cam is in time and if you need to do a re-do