Excessive engine noise


Information and questions on GL1100 Goldwings (1980-1983)
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Mikejjensen
Posts: 4
Joined: Sun Jul 17, 2011 7:24 am
Motorcycle: 1980 gl1100a interstate

Excessive engine noise

Postby Mikejjensen » Thu Aug 11, 2011 5:36 pm



I have a 1980 GoldWing Aspencade. When the bike warms up it starts making noise which seems to be loudest by the oil pump especially at highway speeds. It is like a knocking noise, hard to explain really. Does anyone know what may be causing this? The bike has 107000 on it.



Old Fogey
Posts: 724
Joined: Fri Oct 30, 2009 2:09 am
Location: Glasgow Scotland
Motorcycle: 1976 GL1000
1979 GL1000
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Re: Excessive engine noise

Postby Old Fogey » Sat Aug 13, 2011 9:27 am

Kinda curious how you could tell it's coming from the oil pump when riding it, especially at speed?

Does the noise seem to come from the front or the back of the motor?
Is it intermittent or constant?
Does it do it more under load, or less?
Can you hear it at idle?

Put the bike on the stand, get someone to help you with the throttle and use a long screwdriver as a sort of stethoscope to check around the engine at different engine speeds to try to isolate it more.
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

Mikejjensen
Posts: 4
Joined: Sun Jul 17, 2011 7:24 am
Motorcycle: 1980 gl1100a interstate

Re: Excessive engine noise

Postby Mikejjensen » Sun Aug 14, 2011 7:20 am

That is how I came to the conclusion that it was coming from the oil pump area, I used a long extension and ran the engine at around 4500rpm. It seems to be fine until I take it up to highway speeds (above 60 mph) then it continues to make noise even at lower speeds. If I am just driving around town it seems to be fine. I guess it does not really happen until I run it for a bit over 4000rpm.

Mikejjensen
Posts: 4
Joined: Sun Jul 17, 2011 7:24 am
Motorcycle: 1980 gl1100a interstate

Re: Excessive engine noise

Postby Mikejjensen » Sun Aug 14, 2011 7:22 am

Also it is an Intersate, which I am sure doesn't matter, why I said Aspencade I have no ides.

Old Fogey
Posts: 724
Joined: Fri Oct 30, 2009 2:09 am
Location: Glasgow Scotland
Motorcycle: 1976 GL1000
1979 GL1000
Contact:

Re: Excessive engine noise

Postby Old Fogey » Sun Aug 14, 2011 8:24 am

I very much doubt that you would hear noise from the oil pump. It's a trochoidal design and buried deep in the cases.
My bet is the water pump, which is driven by the oil pump shaft. Drain your coolant, remove the front pump cover and check the impeller for ANY movement. Usually you will get water or oil leaks from the weep hole underneath, but I have an engine here in which the Bakelite impeller blades are actually worn away, along with the front cover, and no leaks. I can wiggle the impeller about 3-4 mm in any direction.
Your engine will have a steel impeller which would make a real noise. The Bakelite one, being plastic, would not have been anything like as noisy and so got run for a long while like that.
Check the first picture in this Tech Tip; you can see the ridge where the cover has been worn away.
http://www.wingovations.com/#/warped-wa ... 4539772426
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

Mikejjensen
Posts: 4
Joined: Sun Jul 17, 2011 7:24 am
Motorcycle: 1980 gl1100a interstate

Re: Excessive engine noise

Postby Mikejjensen » Tue Aug 16, 2011 1:31 pm

Thanks for the info. I will break it down this weekend and take a look. I'll let you know what I find out.




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