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Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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Old 11-21-2012, 01:20 AM   #1 (permalink)
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Question Rattling sound near clutch cover

Hi

I am a bit stuck with this one.
Recently I replaced the starter motor along with several other repairs (new igniter, solenoid, headlight). When I started the bike there was a knocking rattling noise that hadn't been there before. I have tracked it down to the vicinity of the clutch cover. After reading about the loose alternator through bolt issue I removed the alternator but that isn't the problem. I took the new starter motor out as well. Then I found what seems to be a lot of end play on the sprag clutch gear that the stater motor drive engages. It knocks against something when I push it forward (away from the starter motor side). I am thinking it might be the problem.
Has anyone had issue with this or is that amount of end play acceptable? If this is the fault, I am at a loss to understand why it would only be doing this after I replaced the starter motor.
Next question is how do I access the sprag clutch? I scanned the Haynes manual but I couldn't find anything about it.
Any help with this would be greatly appreciated.
thanks
andre12a
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Old 11-21-2012, 05:51 PM   #2 (permalink)
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Hi andre12a i not had this prob b4 on my own bike but you asked how you access the sprag clutch am afraid thats a total engine strip down and crankcase split unless you have an early t/bird as in 1995 model i belive that has an access panel which i belive with some dificulty can be changed via that panel but from what you describe i really dont think this is your promblem there lots of links on here about sprag clutch failure that would describe in more detail the symptoms
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Old 11-21-2012, 09:35 PM   #3 (permalink)
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Thanks Hawk.
This one seems to have everyone stumped. Out of 60 views you have been the only reply.
I don't relish the thought of splitting the bike on the hunch it might be the sprag. It appears from the other posts that you suggest reading that a sprag problem has different symptoms to what I am experiencing. I still don't know if the endplay on the sprag gear is acceptable. I'll do some more searching on the net and see what I can find.
By the way the bike is a 2001 T'Bird.
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Old 11-22-2012, 03:56 PM   #4 (permalink)
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hi again andre sry you never had much feed back on this one as far as i can remb the syptoms of sprag fail is a loud clunking noise from the starter motor but this is only heard when trying to start the bike am sure somone else will come in on this am wondering if u have a broken clutch spring or plate and this is causing the noise just my thought sry i cant help you further ive never seen this prob whilst ive been on this site
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Old 11-23-2012, 02:46 PM   #5 (permalink)
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I'm no mechanical guru, but it doesn't sound like the sprag. Engine noises are notoriously difficult to diagnose remotely - one person's loud rattle is someone else's normal running!

On that side of the engine, the cam chain can make a fair old noise if it is worn or if the tensioner is on the way out. The carbs being out of balance can also make one of these engines sound a bit rough. Perhaps wear on the clutch basket? Sorry can't be of more help, but hope you get things sorted out.
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Old 12-01-2012, 06:40 PM   #6 (permalink)
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Andre12a....
I had the same rattling on my '96 Trophy 900. It started fine but rattled like crazy. The mechanic at the Tri dealer where I was in sales said I had a "broken" bolt on the alternator. Now, I don't know how the bike could start reliably and sound like it did with a broken bolt. Maybe he meant 'loose'. He never asked me to come to the shop to see the problem, so I can't say absolutely what he meant.
I had the alternator off some years later to replace the o'ring, but did not bother investigating the earlier "broken bolt" issue.
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Old 12-01-2012, 11:59 PM   #7 (permalink)
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search here for alternator rattle. It's been written about many many times.

Also in the Urban Sports forums. It was a problem on several T3 models before 1998.
And s few after that.
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Old 12-10-2012, 02:35 PM   #8 (permalink)
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thanks for the heads up denny. was about to post about it also.
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