Clunking from final drive


Information and questions on GL1500 Goldwings (1988-2000)
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Davcoo
Posts: 2
Joined: Sun Mar 15, 2020 11:21 am
Location: Rio rancho nm 87124
Motorcycle: 1995 goldwing 1500 a

Clunking from final drive

Post by Davcoo » Sun Mar 15, 2020 12:47 pm



I have a 95 goldwing 44000 miles clunking sound when riding or running on the on center stand . From final drive pulled it and diff shaft looks good .ujont good .hub looks good .found sum metal in lub no broken teath on ring



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CrystalPistol
Posts: 1115
Joined: Wed Mar 10, 2010 9:07 pm
Location: Shenandoah Valley of Virginia
Motorcycle: 1997 GL1500SE/'98 Lehman Trike

Re: Clunking from final drive

Post by CrystalPistol » Sun Mar 15, 2020 3:31 pm

I have a 95 goldwing 44000 miles clunking sound when riding or running on the on center stand . From final drive pulled it and diff shaft looks good .ujont good .hub looks good .found sum metal in lub no broken teath on ring
Don't know what about your metal, how much, where, size, type … etc …

But in the power trains of vehicles there are clearances which allow for smooth running between gears, etc., when heated up and for lube. Electric motors run smoothly, but internal combustion engines have "power pulses" that lead to slight oscillations of crank shaft speed (rpm) … they speed up and slow down. A single cylinder 4 stroke engine has one power pulse in every second crank shaft revolution, no more and it's a brief push of the piston on a down stroke against a connecting rod to the crank shaft throw. On a multicylinder engine, they get spread out, but they are still power pulses. You don't feel it when the wheel is on the ground and the bike is moving, because the load itself (bike, rider, wind, etc) dampens the oscillations. Sitting on a center stand, rear wheel in the air, in gear, engine running at low speed, no load, you will hear the slack as the wheel tries to spin evenly liker a flywheel while the engine crank shaft oscillates. If you let the bike slow way down while riding in gear so the engine is close to idle, you'll feel the power pulses as it lugs.

It's why the 1500 cc 6 cylinder Goldwing is smoother in power delivery than a 1200 cc 4 cylinder Goldwing through the lower end, but get the 1200 up over 2500 or 3000 rpm, it's smooth too.

Also, there is a shock absorbing device built into the transmission output shaft that is a vane sitting in a pair of U shaped ramps, it's spring loaded, it normally has the vane riding the bottom of the Us but under shock loads, it will start to climb the sides of the U against spring pressure. I can be felt at times too.
Make Courtesy your "Code of the Road" …

… & Have a Safe Trip!
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Davcoo
Posts: 2
Joined: Sun Mar 15, 2020 11:21 am
Location: Rio rancho nm 87124
Motorcycle: 1995 goldwing 1500 a

Re: Clunking from final drive

Post by Davcoo » Sun Mar 15, 2020 4:17 pm

CrystalPistol wrote:
Sun Mar 15, 2020 3:31 pm
I have a 95 goldwing 44000 miles clunking sound when riding or running on the on center stand . From final drive pulled it and diff shaft looks good .ujont good .hub looks good .found sum metal in lub no broken teath on ring
Don't know what about your metal, how much, where, size, type … etc …

But in the power trains of vehicles there are clearances which allow for smooth running between gears, etc., when heated up and for lube. Electric motors run smoothly, but internal combustion engines have "power pulses" that lead to slight oscillations of crank shaft speed (rpm) … they speed up and slow down. A single cylinder 4 stroke engine has one power pulse in every second crank shaft revolution, no more and it's a brief push of the piston on a down stroke against a connecting rod to the crank shaft throw. On a multicylinder engine, they get spread out, but they are still power pulses. You don't feel it when the wheel is on the ground and the bike is moving, because the load itself (bike, rider, wind, etc) dampens the oscillations. Sitting on a center stand, rear wheel in the air, in gear, engine running at low speed, no load, you will hear the slack as the wheel tries to spin evenly liker a flywheel while the engine crank shaft oscillates. If you let the bike slow way down while riding in gear so the engine is close to idle, you'll feel the power pulses as it lugs.

It's why the 1500 cc 6 cylinder Goldwing is smoother in power delivery than a 1200 cc 4 cylinder Goldwing through the lower end, but get the 1200 up over 2500 or 3000 rpm, it's smooth too.

Also, there is a shock absorbing device built into the transmission output shaft that is a vane sitting in a pair of U shaped ramps, it's spring loaded, it normally has the vane riding the bottom of the Us but under shock loads, it will start to climb the sides of the U against spring pressure. I can be felt at times too.
Fine metal llots

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Rambozo
Posts: 382
Joined: Sun Apr 01, 2018 8:36 pm
Location: Disneyland
Motorcycle: 1992 GL1500 Aspencade

Re: Clunking from final drive

Post by Rambozo » Sun Mar 15, 2020 4:56 pm

Look at the shape of the splines. If they come to a point at the top, they are worn out and both parts should be replaced. This happens from lack of lube. You can Google pictures of good and bad splines to see how your's are. That would explain the metal dust in the hub. If you still have some life in them, be sure to lube them with moly paste before you put them back together, and clean out all the metal in there.



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