Oh dear I've got a noise


Information and questions on GL1500 Goldwings (1988-2000)
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Sidcar
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Oh dear I've got a noise

Post by Sidcar » Sun Dec 11, 2016 1:00 pm



My recently acquired 1995 GL1500 has developed a rumbling/knocking/banging noise at idle and up to about 1500rpm. Pulling in the clutch makes no difference. I had a very similar noise on my previous GL1500 when I put a high output alternator on it only this one does it even with the alternator removed. Using a screwdriver as a sound stick the noise is heard the loudest on the alternator, the end farthest from the engine. With the alternator off there is no particular "sweet spot" spot and is barely audible using the sound stick though clearly heard without it.
I fitted new spark plugs, cam belts and air filter about 80 miles ago. I went for ride Thursday during which I went to overtake a slow moving tractor and trailer up hill. I pulled out and whipped the throttle open to accelerate past but there must have been mud or a grease patch because instead of roaring past the revs shot up but the speed didn't, the rear wheel had broken traction and the revs shot into the red before I could close the throttle, however i did another twenty miles after that and it performed perfectly. I didn't notice any unusual noise when I got home but when I started it to go out this morning there it was.
Any ideas? Instant solutions appreciated.
Not what I wanted for Christmas.

Sid



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CrystalPistol
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Re: Oh dear I've got a noise

Post by CrystalPistol » Sun Dec 11, 2016 2:56 pm

Well, at first my thought was "loose cam belt" adjustment. Loose they slap and rap at low speed, tight and they sing.

I know you said the noise sounds loudest at the rear .... but you also just changed the cam belts.

May be something else totally unrelated.
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Yellowdog
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Re: Oh dear I've got a noise

Post by Yellowdog » Sun Dec 11, 2016 3:04 pm

Nothing more annoying than a "noise "
As I am very new to gold wings I am probably very wrong but I'm sure I've read somewhere that some models suffer from alternator bearing failure ,there are some threads on here about it.
Hope you get to the bottom of it.

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Sidcar
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Re: Oh dear I've got a noise

Post by Sidcar » Sun Dec 11, 2016 3:49 pm

If it is just cam belt adjustment I shall be:
A. Surprised
B. Very relieved
I plan to check them tomorrow.

Sid

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Charlie1Horse
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Motorcycle: 1986 GL1200A Aspencade
1992 GL1500I Interstate

Re: Oh dear I've got a noise

Post by Charlie1Horse » Sun Dec 11, 2016 7:02 pm

Well, if the RPMs shot up and the rear tire never broke loose on the pavement I would say you should check out the clutch which could also be the source of your noise. Even though it is a wet clutch it should not slip as it obviously is from your description.
Russell

Those who say it cannot be done should try not to interrupt those who are doing it.

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Sidcar
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Re: Oh dear I've got a noise

Post by Sidcar » Sun Dec 11, 2016 7:33 pm

Sorry no the wheel did break loose, The revs went into the red but I did another 20 miles afterwards no problem.

Sid

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Sidcar
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Re: Oh dear I've got a noise

Post by Sidcar » Mon Dec 12, 2016 8:54 am

Fiddling about this morning trying to find this noise i noticed that the noise virtually disappears when I turn on the lights and a load on the alternator. To me this suggests something in the alternator drive gears?

Sid

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WingAdmin
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Re: Oh dear I've got a noise

Post by WingAdmin » Wed Dec 14, 2016 11:55 am

Sidcar wrote:Fiddling about this morning trying to find this noise i noticed that the noise virtually disappears when I turn on the lights and a load on the alternator. To me this suggests something in the alternator drive gears?

Sid
It could also be something as simple as the rubber alternator buffers failing and allowing metal-to-metal contact.

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Sidcar
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Re: Oh dear I've got a noise

Post by Sidcar » Wed Dec 14, 2016 2:30 pm

I'm taking the alternator off again tomorrow so I'll check them then.
Does anyone know how much end float there should be on the alternator drive shaft?

Sid

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virgilmobile
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Re: Oh dear I've got a noise

Post by virgilmobile » Wed Dec 14, 2016 4:16 pm

I just replaced the bearings in my stock alternator.The driven impeller does not have any movement except rotation.It does not move any other direction.In or away from the casting.

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Sidcar
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Re: Oh dear I've got a noise

Post by Sidcar » Wed Dec 14, 2016 5:46 pm

Just to clarify the shaft I'm referring to is the one in the engine that drives the alternator not the shaft in the alternator itself. Er at least I hope that's clarified things.

Sid

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virgilmobile
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Re: Oh dear I've got a noise

Post by virgilmobile » Wed Dec 14, 2016 9:53 pm

Oh.OK.I'll check asap.my alternator is still off.

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virgilmobile
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78 GL1000
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Oh dear I've got a noise

Post by virgilmobile » Wed Dec 14, 2016 9:58 pm

Just grabbed the output flange on the rear of the engine that the rubber pads set on.Its absolutely rock solid.No free movement in any direction.

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mstcitabria73
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Re: Oh dear I've got a noise

Post by mstcitabria73 » Sat Feb 03, 2018 5:39 am

were you able to determine the issue with your bike? having the same problem with my 1997 GL1500,
viewtopic.php?f=6&t=41258 .
here is another related post that might be of help,
viewtopic.php?f=6&t=38042



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