I'm in the middle of sorting out 'Sarah Jane' (1933 Flying Fox) for the short trip to the Northern Section meet at Falcon Manor in Settle next Sunday. I hope to come to Tewkesbury on her for the National Rally in late May which will be a rather longer round trip. Amongst many other things that I have attended to is that I've undone the plug in the front of the timing case and found the chain was a little sloppy. So I slackened off the three dynamo bolts and levered the dynamo towards the near side until I obtained the required feel to the chain as mentioned in the Pitman's Book of the Jowett. It's only a minute amount.
The question is:- Has this altered the setting of the distributor, and will I have to adjust it?
Tony.
Pre-war timing chain tension
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Tony Fearn
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- Your interest in the forum: Early pre-wars. Owner of 1933 'Flying Fox' 'Sarah Jane, and 1934 Short saloon 'Mary Ellen'.
- Given Name: Anthony
- Location: Clayton le Moors, Lancashire, the Premier County in the British Isles!!
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Keith Clements
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- Your interest in the forum: Jup NKD 258, the most widely travelled , raced and rallied Jowett.
- Given Name: Keith
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Re: Pre-war timing chain tension
Probably not as the chain should always be in tension. However, the slow wear of the chain will have affected the timing but by an imperceptible amount. The timing chain on pre-war models will also affect the ignition timing as well as the valve timing. See Pitman book page 27-28.
Note that on overrun a slack chain might affect the timing as there is a chance the inertia could move the chain out of tension. But this too would be difficult to notice.
Note that on overrun a slack chain might affect the timing as there is a chance the inertia could move the chain out of tension. But this too would be difficult to notice.
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