JJC Posted February 5, 2017 Report Share Posted February 5, 2017 The Moss catalogue shows three bearings (138490) on the countershaft (153978). Our car has only two on the shaft ends and there's no sign of the middle one having been there. Well not for 30 years anyway. What's the general view, should there be one in the middle or not? JJC Quote Link to post Share on other sites
john.r.davies Posted February 5, 2017 Report Share Posted February 5, 2017 Just checking, this is on the throttle linkage, yes? Not the throttle spindle? John Quote Link to post Share on other sites
TriumphV8 Posted February 5, 2017 Report Share Posted February 5, 2017 The construction for moving the spindle levers is one of the weak points of TR6 That is why they tried to improve with the CR system with two balancing pipes. As most people are not able to do the radical job and boost the linkage to the quality of a modern system its often claimed that it is good as it is. Unfortunately any play causes a difference in opening of the plates as the bending of the countershaft does, too. Definitely you will have to run the engine a bit richer than required to give the cylinder with the most open throttle plate a sufficient mixture. Also the engine does not run that smooth as it could. A German guy, Ulrich Schaubhuth, did a very good job modifiying CPs and people who run that system all reported big benefits. Mismatch is done by the play in many areas, mostly in the spindles to manifold. But also the countershaft has its influence. The bushings give some play and even a bit more play when the middle bushing is missing. Minimum to repair is to fit thre proper bushings where the one in the middle has to be cut to fit over the shaft and its a bit tricky to get it into position. Its worth the effort! After that a carefull setup of the sync of the six throttle plates is necessary. Quote Link to post Share on other sites
JJC Posted February 5, 2017 Author Report Share Posted February 5, 2017 it is the countershaft which is very substantial lump, not likely to bend. It looks to me as though the central bearing/ bush was never there, not even when it left the factory. JJC Quote Link to post Share on other sites
john.r.davies Posted February 5, 2017 Report Share Posted February 5, 2017 Please answer me, JJ? I have a special interest in spindle bearings - see my thread http://www.tr-register.co.uk/forums/index.php?/topic/59796-sticking-throttle-spindle-cures/&do=findComment&comment=500913 Meanwhile, dos this thraed help you? http://www.tr-register.co.uk/forums/index.php?/topic/60380-upgrading-throttle-linkage-bushes/?hl=spindle&do=findComment&comment=508714 John Quote Link to post Share on other sites
JJC Posted February 6, 2017 Author Report Share Posted February 6, 2017 John. It is the countershaft not the shaft carrying the butterflies. So far as I know the bearings/bushes are original and have never given me a problem in all the years I've been driving the car. Just that putting it back together after the latest rebuild we noticed the middle bearing missing. As the second thread you posted said you can only put a decent bearing in if you cut the shaft. For a road car I'm just going to leave it as it's been for the past 100000 miles. Not only that when set up by the Landers it used to run beautifully. If it ain't broke don't fix it. JJC Quote Link to post Share on other sites
Steves_TR6 Posted February 6, 2017 Report Share Posted February 6, 2017 I just replaced the original plastic bushes with the blue poly ones, and the adjustable linkages with the easier to adjust new ones, both from moss. Fitting wasnt difficult, as above you'll need to cut the middle bush to fit it, i also applied a little copaslip. The new linkaged allow relatively simple setup, by balancing the flow at idle with a flowmeter. Very wothwhile job, i noticed a significant smoothness improvement. Steve Quote Link to post Share on other sites
Gary Flinn Posted February 7, 2017 Report Share Posted February 7, 2017 I just replaced the original plastic bushes with the blue poly ones, and the adjustable linkages with the easier to adjust new ones, both from moss. Fitting wasnt difficult, as above you'll need to cut the middle bush to fit it, i also applied a little copaslip. The new linkaged allow relatively simple setup, by balancing the flow at idle with a flowmeter. Very wothwhile job, i noticed a significant smoothness improvement. Steve Ditto I did this with a little help from a Mate on my 5 and it made no end of difference to smooth running and good pick up It will never be as good as one of the modified linkages with proper bearings, but good enough for me and didn't cost a fortune Gary Quote Link to post Share on other sites
john.r.davies Posted February 7, 2017 Report Share Posted February 7, 2017 Ah, so! Thnak you, JJ. John Quote Link to post Share on other sites
GT6M Posted February 7, 2017 Report Share Posted February 7, 2017 its best to dump the end bushes, useless thingys they are, Wot yer left wid is the end oft shaft, get some brass or PB2 bar, drill it to the size oft shaft, then attach thee,s bushes to the end original rubber bush holders a few drops of oil noo an then works wonders too. esp into yer throttle spindals, this way, the shaft is held nice,n tite M Quote Link to post Share on other sites
Tim D. Posted February 8, 2017 Report Share Posted February 8, 2017 As I mentioned in another thread, you can get "top hat" shaped oilite bushes that are a perfect fit (no modification required) and they cost less than a tenner http://www.bearingboys.co.uk/Metric-Flanged-Oilite-Bearings-1256-c These are metric sized I think you may need imperial, but they are all here. fitted the correct way round the flanges prevent the bushes from falling out. Cheers Tim Quote Link to post Share on other sites
GT6M Posted February 8, 2017 Report Share Posted February 8, 2017 thats even easier than what I said above, good call, M Quote Link to post Share on other sites
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