Author Topic: Triumph Rattling Alternator  (Read 1916 times)

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#10

Offline apw99

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Re: Triumph Rattling Alternator
Reply #10 on: 30 September, 2021, 12:23:05 PM
Hi folks. After a 6hr run my rattle was more consistent. The fine goes fine and has had this rattle, albeit not as bad, for a long time.
I have checked the alternator, all fine. Checked the starter and sprag clutch.
Have a listen on this YouTube clip:
 

It is impossible to tell which side of the engine the noise is coming from, also screw-driver to the ear has not helped.

I currently suspect timing chain guides, have a look at this clip and I would be interested to know if this guide should move like in the clip:

 

Many thanks for your help, this one has my tiny mind wrecked!

#11

Offline Sidewinder

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Re: Triumph Rattling Alternator
Reply #11 on: 30 September, 2021, 02:54:18 PM
Check how much adjustment is left on your timing chain adjuster.

#12

Offline apw99

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Re: Triumph Rattling Alternator
Reply #12 on: 02 October, 2021, 09:05:48 AM
Thanks Sidewinder, I will check that.

#13

Offline apw99

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Re: Triumph Rattling Alternator
Reply #13 on: 10 October, 2021, 09:53:43 PM
Hi Sidewinder, can you explain to me exactly what those measurements mean?
I have so far pulled the covers on the starter and sprag, I had suspected the noise was a sprag 'catching' but it all looked fine. Then I pulled the clutch cover, noticed the center bearing is very notchy but when I removed the centre plate the bearing feels fine so I think it just does this when the shaft is pressuring the bearing, has anyone else ever noticed this?
https://youtube.com/shorts/sGtnpAZUmhA?feature=share

Next I pulled the cam cover, checked the chain guides, all look okay. Checked the shim clearance as I was in there, all were perfect. Pulled the tensioner and it seems to have a little wear
So I'm wondering if this tensioner is slipping from tome to time and causing the mechanical catching sound - any thoughts anyone?

From a side-view I could see that the teeth were all still intact on the tensioner shaft.


#14

Offline Sidewinder

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Re: Triumph Rattling Alternator
Reply #14 on: 10 October, 2021, 10:05:10 PM
They are to give an indication of how much travel is left on the tensioner tongue, this in turn tells you wether the cam chain is still being held in tension by it and how much adjustment is left.  Can be done without removing the tensioner itself as doing so can potentially cause the chain to lose position on the cogs and put the timing put and also not be seated on the guide blade properly.  If you've taken all the covers off anyway this is not such an issue as you can see what's going on and if timing is ok etc.

The measurements i quoted represent he extremes of the tongue's movement from fully in to fully out.   Given you've removed the unit, you should be able to easily see if it has any adjustment left ie could the tongue be pulled out any further?

#15

Offline apw99

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Re: Triumph Rattling Alternator
Reply #15 on: 09 November, 2021, 10:44:07 AM
I just thought I would update on how this whole debacle unwound!
I decided to do the shim check as I was in that far and as it turned out they were all bang-on so no changes needed.
After checking the clutch area, sprag clutch and starter gear areas I found nothing.
The cam chain tensioner had some marks and the spring was 2-3mm shorter than spec. I bought a new spring from Sprint Engineering and put it all back together. My shed is chaos and I lost the plastic shroud at the front of the tank which took a few days to find! Anyway on sunday I went out and did 150km of back-roads stopping frequently to listen for rattles and no issues. I am still not 100% convinced so another spin-out is in order to confirm but I think this may well be the root cause.

#16

Offline Paul2bikes

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Re: Triumph Rattling Alternator
Reply #16 on: 09 November, 2021, 11:20:15 AM
Could be you've re-assembled something better than it was. I had a horrible noise on a previous trumpy, stripped the clutch, found nothing wrong, re-assembled tightening evenly, rattle gone.

IIRC it was Timbox who measured a cam tensioner spring on his new bike, a Sprint Eng one was several mm longer. Does it say in the manual, what length they should be? Nothing in my Haynes. Shouldn't be a problem on such low miles, I've never had a problem with them on any of my trumpies, one I did 60k miles on. Where's rhead with his 200k miler?
Also: '16 Tiger 800, '95 Yamaha Serow, '58 Ariel FH.

 



reconstruction