HEI "teeth" not lining up??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-03-2006, 08:24 PM
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HEI "teeth" not lining up???

I am in the process of putting my pontiac 400 back together after I took the engine apart and degreed the cam. My problem is with the distributor, which by the way is a summit HEI pontiac distributor.

From everything I have ever done, almost all sbc stuff, I placed the hei distributor into the engine with the crank set at about 10 DBTC as a start. Then I would line the rotor up roughly with a mark I made on the dist. where a post would be by turning the distributor (assuming the shaft is properly engaged with the cam and oil pump). Then I would take off the rotor and make sure the "teeth" on the shaft and dist. are lined up.

So I go through the process with this hei by marking the dist. where the plug post is. Then I removed the cap and lined up the rotor, then I checked the teeth. The teeth are almost completly off!!! The teeth are not even close to lining up, the are about in the middle of each other!! If I move the vacuum advance with my finger while the rotor is pointing at the plug post the teeth come alot closer to lining up.

Whats going on here? This dist. was in the car running last year with no problems. It was pulled this spring when the engine was pulled and rebuilt. the dist. is only about 2 yrs. old.

any help would be great!

thanks,

Matt
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Old 08-03-2006, 09:35 PM
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Old 08-04-2006, 02:28 AM
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Doc here,



What "Teeth" are you talking about????????????

If the Dizzy is in place...and the shaft is lining up you CAN NOT see the cam teeth..(Unless the manifold isn't on..a major Faux pau on an SBC..)

If your talking about the inductive "Star" points..Don't sweat where they align up..you take care of that with advance / Retard of the Dizzy body..

To Do it CORRECTLY...

#1 TDC, COMPRESSION, Both Valves closed , Timing marks lined up..rotor set to #1 Plug tower, dead center of it..

If the Dizzy CAME out of it and it ran...It surely Will go BACK in it and run...IF you do it correctly..

Doc
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Old 08-04-2006, 06:07 AM
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What Doc said. One side note. Having owned a lot of Ponchos, I know the harmonic balancers are not the most robust. The rings can slip around. If you are using a stock balancer, did you check to make sure TDC is true TDC?
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Old 08-04-2006, 07:05 AM
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the teeth i was talking about are the "star" points. Yup its at tdc. I guess I will try dropping it in and see what happens.

thanks
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Old 08-04-2006, 10:34 PM
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Your talking about the rotor being out of phase. What I typically shoot for is making sure the phasing lines up at cruise advance, 32, 34, 38 degrees BTDC. Get it close then fire up the motor and base time it. Roll the motor over to whatever your total is under cruise and check the phasing. Close enough is close enough. If it's too far off you'll see the arcing on the inside of the cap posts, it will look different on the leading edge.

It would seem your OK as from what I gather if you pull in the advance it begins to correct.
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