Soft thumping
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All great advice from the gents who replied after me. I'm concerned you may have a loose bearing fit to the housing. The housing should be warmed to remove the bearings if you are able.
There is no cure for Lotus, only treatment.
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StressCraxx - Coveted Fifth Gear
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- Joined: 26 Sep 2003
- Location: San Francisco Bay Area, California
Thanks for those enthusiastic replies!
I mentioned that the old shaft had showed signs of spinning. The spinning had worn the shaft under the outer bearing, resulting in the play. The bearings themselves have only a trace of play. My bearing carrier still fits new bearings quite well, as I do make use of my blowlamp/oven and freezer where required!
My parts from TTR have arrived - next day delivery! I will reassemble over the next few days, looking carefully for the cause of the thumping. Removing the shaft may have cleared any obstruction, but I will see.....
Cheers,
Dave Chapman.
I mentioned that the old shaft had showed signs of spinning. The spinning had worn the shaft under the outer bearing, resulting in the play. The bearings themselves have only a trace of play. My bearing carrier still fits new bearings quite well, as I do make use of my blowlamp/oven and freezer where required!
My parts from TTR have arrived - next day delivery! I will reassemble over the next few days, looking carefully for the cause of the thumping. Removing the shaft may have cleared any obstruction, but I will see.....
Cheers,
Dave Chapman.
- david.g.chapman
- Fourth Gear
- Posts: 782
- Joined: 26 Nov 2003
- Location: Writtle, Essex
David, the stub shaft spinning and wobbling in the bearing could very well be the cause. Doing the other checks are simply a process of eliminating other possibilities. Best wishes to get it sorted so you can get out for some fun!
There is no cure for Lotus, only treatment.
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StressCraxx - Coveted Fifth Gear
- Posts: 1283
- Joined: 26 Sep 2003
- Location: San Francisco Bay Area, California
The stub shaft worn by bearing happens often. When it happen on a 1970 +2S i owned i got it "metal sprayed" .
Alan
Alan
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
- alan.barker
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Metal spraying is an excellent solution. We frequently used the process to repair machinery shafts. Finish grinding will give you more precise finish dimensions than turning in a lathe.
There is no cure for Lotus, only treatment.
-
StressCraxx - Coveted Fifth Gear
- Posts: 1283
- Joined: 26 Sep 2003
- Location: San Francisco Bay Area, California
It's all back together now, and there is no thumping from the bearings or the rest of the axle assembly.
As to what caused it, I am still not sure - just that the stub axle would have been tilted (as mentioned) and something was just beginning to catch. I can't see any witness marks to point the way.
The old bearings are hardly worn and turn freely.
A couple of things to note during re-assembly:
1. The TTR stub axle re-located the rear brake disc inwards by a fraction of a mm. I could have shimmed the caliper to compensate, but ended up easing the inboard pad a fraction to stop it binding. Works fine now.
2. The holes in the TTR stub axle are smaller than the old axle and a close fit to the drive shaft threaded pins. This meant that I was unable to fit the shaft inboard end first. I manages to fit the drive outboard end first as the diff output shaft is original, has larger holes, and allows the drive shaft pins to come in at a larger angle.
Happy motoring,
Dave Chapman.
As to what caused it, I am still not sure - just that the stub axle would have been tilted (as mentioned) and something was just beginning to catch. I can't see any witness marks to point the way.
The old bearings are hardly worn and turn freely.
A couple of things to note during re-assembly:
1. The TTR stub axle re-located the rear brake disc inwards by a fraction of a mm. I could have shimmed the caliper to compensate, but ended up easing the inboard pad a fraction to stop it binding. Works fine now.
2. The holes in the TTR stub axle are smaller than the old axle and a close fit to the drive shaft threaded pins. This meant that I was unable to fit the shaft inboard end first. I manages to fit the drive outboard end first as the diff output shaft is original, has larger holes, and allows the drive shaft pins to come in at a larger angle.
Happy motoring,
Dave Chapman.
- david.g.chapman
- Fourth Gear
- Posts: 782
- Joined: 26 Nov 2003
- Location: Writtle, Essex
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