Ghia - Noise - Rear Axle

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tommu
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Ghia - Noise - Rear Axle

Post by tommu » Wed Nov 29, 2017 4:58 pm

I have been annoyed by a repetitive whirr whirr noise from somewhere in the rear axle. My senses tell me it's the rear right hip area - but I'm not sure I trust those senses.

Salient points:
  • A deep or low whirr whirr sound. Not loud, not resonating openly. You feel it in the seat of your pants as you drive.. I guess.
  • Doesn't change with speed, direction, gear or whether clutch is engaged.
  • No knocking or looseness when rocking rear wheels whilst on axle stands
  • No roughness when rotating rear wheels
  • Bearings greased in the last month
  • CV Boots intact and not torn
  • I have just removed right side Drive shaft. CV joints have good clean grease. I am currently cleaning and greasing them

Hope to finish CVs tonight / tomorrow but based on what I see this is not the cause.

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Re: Ghia - Noise - Rear Axle

Post by asiab3 » Wed Nov 29, 2017 11:30 pm

Dang Tom, sorry to hear about the troubles. That car is too much fun to be laid up, so thanks in advance for the excellent bullet points. Have you safely put the rear of the car on jacks/stands and slowly engaged the clutch in third gear? Once there, get the rear wheels spinning and clutch into neutral as you cut the key power and let the wheels spin. A rear wheel bearing will manifest itself in a rumbling whirr, instead of a smooth whir.

Have you tried resting your hand on the shifter for a second or two at a time in each gear? Please don't ever do this during normal driving, but I've heard transaxles where a noise was placated by coercing the shift forks into temporary submission. It ended in a transaxle rebuild, but I know yours was done recently, so I'm not suspecting that as a necessary measure, but I would do it if the car was with me.

Glad you're not selling the car,
Robbie
1969 bus, "Buddy"
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"I would not do this again on a short time frame, the country is just so vast and beautiful…" - Barb/Elwood

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Re: Ghia - Noise - Rear Axle

Post by tommu » Thu Nov 30, 2017 12:11 am

Thanks Robbie. I will do that when I get this driveshaft back on. I'm also going to try putting the OG drums back on. These aren't really huge, journey stopping problems. I'm chasing down demons while I wait for parts to come back from Rimco for the bus engine!

This rumbly whirring really sound bugs me. It's not the sound imminent destruction.. just annoying. It bugs me and I can't enjoy driving when I hear it. Same with the steering, no-one else has pointed it out, you and Colin have driven it and it's no worse now than then!

Let me know when you're passing next and a you can take Herman for a spin - tell me I'm hearing things :)

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Re: Ghia - Noise - Rear Axle

Post by Amskeptic » Sun Dec 03, 2017 1:34 pm

tommu wrote:
Thu Nov 30, 2017 12:11 am
Thanks Robbie. I will do that when I get this driveshaft back on. I'm also going to try putting the OG drums back on. These aren't really huge, journey stopping problems. I'm chasing down demons while I wait for parts to come back from Rimco for the bus engine!

This rumbly whirring really sound bugs me. It's not the sound imminent destruction.. just annoying. It bugs me and I can't enjoy driving when I hear it. Same with the steering, no-one else has pointed it out, you and Colin have driven it and it's no worse now than then!

Let me know when you're passing next and a you can take Herman for a spin - tell me I'm hearing things :)

Load up each side of the car with carefully applied swerves. Does the sound respond to loading up? Does it change based on acceleration/deceleration load?
Colin
BobD - 1978 Bus . . . . . . . . . . .110,350 miles
Chloe - 1970 bus . . . . . . . . . . . 206,775 miles
Naranja - 1977 Westfalia . . . . 73,930 miles
Pluck - 1973 Squareback . . . . . 55,478 miles
Alexus - 1991 Lexus LS400 . . . 64,428 miles

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Re: Ghia - Noise - Rear Axle

Post by tommu » Sun Dec 10, 2017 4:19 pm

Does not respond to swerves by getting louder. If anything it gets a little quieter.
The whirring sound seems to be around 2 to 2.5 revolutions per second at 20-30 mph. On acceleration it speeds up to at most 3.5 revolutions per second.

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Re: Ghia - Noise - Rear Axle

Post by Amskeptic » Mon Dec 11, 2017 6:04 pm

tommu wrote:
Sun Dec 10, 2017 4:19 pm
Does not respond to swerves by getting louder. If anything it gets a little quieter.
The whirring sound seems to be around 2 to 2.5 revolutions per second at 20-30 mph. On acceleration it speeds up to at most 3.5 revolutions per second.
Tires.
Colin :blackeye:
BobD - 1978 Bus . . . . . . . . . . .110,350 miles
Chloe - 1970 bus . . . . . . . . . . . 206,775 miles
Naranja - 1977 Westfalia . . . . 73,930 miles
Pluck - 1973 Squareback . . . . . 55,478 miles
Alexus - 1991 Lexus LS400 . . . 64,428 miles

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tommu
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Re: Ghia - Noise - Rear Axle

Post by tommu » Mon Dec 11, 2017 6:51 pm

Amskeptic wrote:
Mon Dec 11, 2017 6:04 pm
tommu wrote:
Sun Dec 10, 2017 4:19 pm
Does not respond to swerves by getting louder. If anything it gets a little quieter.
The whirring sound seems to be around 2 to 2.5 revolutions per second at 20-30 mph. On acceleration it speeds up to at most 3.5 revolutions per second.
Tires.
Colin :blackeye:
Oh. That would be nice. I'll move them around and report back.

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Re: Ghia - Noise - Rear Axle

Post by Amskeptic » Mon Dec 11, 2017 8:23 pm

tommu wrote:
Mon Dec 11, 2017 6:51 pm
Amskeptic wrote:
Mon Dec 11, 2017 6:04 pm
tommu wrote:
Sun Dec 10, 2017 4:19 pm
Does not respond to swerves by getting louder. If anything it gets a little quieter.
The whirring sound seems to be around 2 to 2.5 revolutions per second at 20-30 mph. On acceleration it speeds up to at most 3.5 revolutions per second.
Tires.
Colin :blackeye:
Oh. That would be nice. I'll move them around and report back.
Remember to lose air for the new front positions and add air for the new rear positions. I hope this eradicates it.
BobD - 1978 Bus . . . . . . . . . . .110,350 miles
Chloe - 1970 bus . . . . . . . . . . . 206,775 miles
Naranja - 1977 Westfalia . . . . 73,930 miles
Pluck - 1973 Squareback . . . . . 55,478 miles
Alexus - 1991 Lexus LS400 . . . 64,428 miles

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