[Fot] Too much clearance on distributor drive gear

[tr4racing at googlemail.com]

I could imagine, that with the back in time production all parts were matched to a block?

 

Cheers

Chris

 

Von: Fot <fot-bounces at autox.team.net> Im Auftrag von timmmurphh--- via Fot
Gesendet: Dienstag, 19. März 2019 16:48
An: 'Robert Lang' <robertlangtr6 at yahoo.com>; fot at autox.team.net
Betreff: Re: [Fot] Too much clearance on distributor drive gear

 

Thanks for all of the responses.  I’ve used this distributor in another block, and this is the first time in the “new” block.  In the old block I had the correct clearance without shims so I think you are all correct in that I need a new bushing in the “new” block.  The bushing didn’t look obviously worn but I guess looks are deceiving!

 

Thanks again, FOT is great!

 

Tim

 

From: Robert Lang <robertlangtr6 at yahoo.com <mailto:robertlangtr6 at yahoo.com> > 
Sent: Tuesday, March 19, 2019 7:07 AM
To: fot at autox.team.net <mailto:fot at autox.team.net> ; timmmurphh at gmail.com <mailto:timmmurphh at gmail.com> 
Subject: Re: [Fot] Too much clearance on distributor drive gear

 

Hi - if the bushing is worn, it needs to be replaced. I would not run the gear with a thin shim under it, the shim will not last. I just looked at Moss and they have that distributor bushing listed for $75 plus or minus.

 

If you have slop with that distributor drive, you will never get the ignition timing to be rock solid.

 

Regards,

Bob Lang

 

On Tuesday, March 19, 2019, 12:36:30 AM EDT, timmmurphh--- via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote: 

 

 

On page 1.130 and 1.131 of the Workshop Manual it describes the procedure for obtaining the correct clearance or float for the distributor gear driven by the camshaft.  It gives two scenarios: one where there is interference of the gear and the bushing; and a second where there is not enough clearance or float.  What it doesn’t consider is if there is too much clearance between the gear and the bushing.  That is the case on my TR4 engine.  I had 0.016 clearance and added a 0.010 shim under the gear to get the desired 0.006 clearance.  Has anybody else had this experience?  And what did you do about it.

 

Tim Murphy

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