Timing chain & Distributor gear on BBC???

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dirtracer4
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Timing chain & Distributor gear on BBC???

Post by dirtracer4 » Fri Feb 14, 2014 3:55 pm

I found that my timing was fluctuating, so I pulled the distributor for the first time since purchasing boat and it had a steel gear on it. Shouldn't it have a bronze gear if it's a hyd. roller cam? I couldn't really tell if the cam gear was worn.
It's a Felber 598 and I have had no luck obtaining a good contact with Felber to ask him, so maybe someone that has experience with these motors could help.
I'm also wanting to know how often to replace the timing chain. The motor has about 250hrs and about 2* of slop. I would also like to verify valve settings since some hyd. rollers are set with lash and others are zero lash.
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Re: Timing chain & Distributor gear on BBC???

Post by eagal69 » Fri Feb 14, 2014 5:46 pm

I have a bronze gear on mine. I was told it was to eliminate wear on the cam. Do you have a single or doulbe chain. Mine has a double chain and is pretty snug.
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Re: Timing chain & Distributor gear on BBC???

Post by Joe » Fri Feb 14, 2014 7:57 pm

No you dont need a bronze gear. The cam is ment to have a steel gear on it.
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Re: Timing chain & Distributor gear on BBC???

Post by BEAVER » Sat Feb 15, 2014 9:26 am

8620 billet cams require either a bronze or polymer distributor drive gear.

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Re: Timing chain & Distributor gear on BBC???

Post by SWAMPHUNTER45 » Sat Feb 15, 2014 9:46 am

My GM family is poly cost $100 from Comp Cams.

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Re: Timing chain & Distributor gear on BBC???

Post by lil_armond » Tue Feb 18, 2014 4:08 pm

You really should set your valve lash on the heel of the cam lobe not at zero. My BBC has a steel gear and it is a roller, I am sure if it is a fully Felber built motor it is right. Unless you are running a crank trigger your timing will bounce a little. Maybe you need to reset the timing, and you have a little chain stretch.
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dirtracer4
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Re: Timing chain & Distributor gear on BBC???

Post by dirtracer4 » Wed Feb 19, 2014 9:01 am

Thanks for the input. A ten min talk with Felber would be nice.
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Re: Timing chain & Distributor gear on BBC???

Post by loudmouse » Wed Feb 19, 2014 10:32 am

Steel gear on hydraulic roller is right. Some play in chain is normal. Adjust lifter to zero lash plus half a turn
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