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timing

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timing
#1
GDL412 Garry Loomis
Granville, NY, USA   USA
have digital timing light , u can read rpms on it ,rpms fluctuate in 100 range, jumps around, runs good but could run better. set at 10 degrees BTDC, timing mark is not steady either . thanks garry

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TR3driver Randall Y
Confusion, Los Angeles, USA   USA
Usual cause of spark scatter is a worn distributor. Take the distributor cap off and try to wiggle the shaft sideways (towards and away from the points is where it usually wears the most). If you can feel it wiggle, time for a rebuild.



Randall
56 TR3 TS13571L daily driver
71 Stag LE1473L awaiting engine rebuild
7? Stag awaiting gearbox rebuild

Tonyfixit Avatar
Tonyfixit Tony M
Duncan, British Columbia, Canada   CAN
In reply to # 1495264 by TR3driver Usual cause of spark scatter is a worn distributor. Take the distributor cap off and try to wiggle the shaft sideways (towards and away from the points is where it usually wears the most). If you can feel it wiggle, time for a rebuild.

Agree.

The bushing is easily replaced. If the distributor shaft shows wear, longer or extra bushings can be used to bare on the un-warn parts of the shaft.

I have found common Oilite bushings from a local vendor to be a perfect fit.

Some timing scatter is inherent with points ignition, it's more problematic the more cyls there are 4cyl - 6cyl.

Electronic conversions all but eliminate the problem. But you would still want to replace that bushing.

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POW Peter Wirth
HEBRON, NH - New Hampshire, USA   USA
I think the problem with that distributor as used on the TR6 is that because of the tach drive in the center of the shaft, two short bushings must be used on either end. Coupled with points that apply on- off pressure 6 times per revolution and that top bushing quickly wears. If not too bad electronic ignition will totally take away the bounce because the pressure exerted by the points in the first place will be gone and the shaft will run true. By comparison an early (1971) Jaguar has the same basic distributor and point are exact, however there is no tach drive on the shaft and the bushing is one long piece. That long shaft- bushing allows for good support the length of the shaft preventing wear.

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