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Old 08-20-2004, 11:41 AM
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strange noise

swapped a 327 from 72 vega in my datsun 240z. When the motor is started it makes what sounds like a diesel noise that last for 2-3 seconds. At first I thought the noise was maybe my makeshift exhaust hitting the tranny the noise did not go away after I had the exhaust done proper at the muffler shop.

The 327 never did this when it was in the vega and the only thing that is different is I went to a dual point accel instead of a HEi because of firewall clearance.

So im thinking maybe it timing prob..i have it set at 8 before with vacuum advance to ported. any ideas? no diesel on shutoff...
Any ideas, bob

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Old 08-20-2004, 12:42 PM
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Vacuum advance should be on a manifold source and the timing set at 12 degree`s before top dead center. I would have never went with a points type distributor of any kind, I would just gotten a stock points type and bought a electronic conversion kit, the best place for points is in the trash. check the harmonic balancer, see if it`s loose in anyway, sometimes the bolt comes loose or the old press on type becomes loose and wallows the key way out, and when you start it, it`ll make several loud bumps almost like a diesel since the balancer is freely moving back and forth due to the slop. check all the other clearances, make sure a motor mount isn`t broken or loose, have a friend start the car and keep a close eye on everything, including the starter, good luck.
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Old 09-29-2004, 04:36 PM
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I checked everything for clearance..everything is fine. It only does it for a couple seconds when it first starts and not every time so its difficult to pinpoint...
then i thought of an idea..i turned the idle way down till it almost stalled and bamm there the noise was..not as loud but i think its the same noise. I think its coming from the distributor.

Took cap and rotor off and discovered there is side to side play of the shaft of at least 1/8 inch..what causes this and is it repairable..


I want to buy a ready to run msd or Mallory but money is tight right now. Hei are cheaper but no room..to close to the firewall and i don't want to bamm it in

Last edited by 72chevy240z; 09-29-2004 at 04:46 PM.
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