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Tractor Pulling Discussion Forum

Degreeing camshaft

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REDJD

02-16-2006 16:33:20

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Had my A JD camshaft ground and when it came back it had a card with instructions to degree intake lobe to 110.Could use some help with this,since I don't really understand how this works.Does this mean the marks on the cam and crank won't be lined up as before? Thanks for any help

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jd b puller

02-17-2006 14:40:21

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Re: Degreeing camshaft in reply to REDJD, 02-16-2006 16:33:20

I put a B together this fall. The recommended Intake Centerline was 106 degrees. With it one tooth off, I got to within 1/2 degree. Then set your governor one tooth the other way and badda-bing, you're done. To check your work, the impulse (if mag) should fire just like normal.

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REDJD

02-16-2006 19:14:41

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Re: Degreeing camshaft in reply to REDJD, 02-16-2006 16:33:20

Thanks for the help guys, I understand this a lot better now.

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Lynard

02-16-2006 17:49:06

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Re: Degreeing camshaft in reply to REDJD, 02-16-2006 16:33:20

REDJD Your marks will line up as before but the intake centeline probably will be off the 110 degree they want you to have. Did mine years ago and slotted the holes in the cam on my brothers Bridgeport so I could rotate it to get the centerline on 108 for my application. Marked the cam and drilled another hole in it and tapped the gear and screwed 1/4 inch bolt in it so it would not turn and tightened up the cam bolts real tight. Take an old bearing and slot a 1/4 rod and wind emery paper on it then grind the inside of the bearing with a high speed so you can slide the bearing on and off easy. This will help when you degree it and take it out several times. Put good bearing on when you are ready to install. Lynn

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REDEYE

02-16-2006 17:01:46

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Re: Degreeing camshaft in reply to REDJD, 02-16-2006 16:33:20

This will get you started:

Link

Degreeing in a cam is not that hard, if you have done it before. The link describes an automotive application, but the fundamentals are the same. Your goal is to have the intake at max lift (lifter centered on top of cam lobe) when the crank is at 110 degrees past TDC. More than likely your timing marks will be close, but it is quite possible that they wont line up, depending on where your stock intake centerline was.

Will need a degree wheel and probabbly someone who has done this before to help you. Anyone who has ever built a competition engine before, drag racing or circle track or others should have a degree wheel and enough knowledge to help you get it dialed in.

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