Rumble and Hum (1 Viewer)

[Neilo]

Hi all,
I've had a search but not found anything that gave me the "aha" moment.

BJ40 1979 R/H drive, has developed a rumble/hum at approximately 75 - 80 kmh (45 - 50 mph) but only when driving around a slight L/H bend in the road. The noise disappears when I straighten out or turn the wheel to the right. I cannot really confirm where the noise is coming from but I get the impression it is the front L/H side (passenger side) of the vehicle.

Common response across the board seems to point the finger at wheel bearings and consensus seems to be that the L/H turn puts extra pressure on the R/H wheel bearing and thus the noise/rumble.

So far I have:
New wheels and tyres balanced and rotated several times.
Fully rebuilt swivel hubs and new front wheel bearings.
Completely replaced all tie rod ends.

I will soon get a wheel alignment done after the swivel hub rebuild.

Nothing I have tried as yet has helped, just curious if any of you guys have experienced something similar and have an idea.

Cheers, Neil.

 

[CruisinGA]

If you recently replaced the front wheel bearing I would check the preload on those front wheel bearings since some break in is not that unusual

 

[45Dougal]

Checked the rear wheel bearings?

Everything greased as it should be? Prop shaft etc..

Body and engine mounts all tight?

Does it do it in both 2WD and 4WD?

 

[Neilo]

If you recently replaced the front wheel bearing I would check the preload on those front wheel bearings since some break in is not that unusual

Will do, although the noise was still evident immediately after the bearing replacement on the test drive.

 

[Neilo]

Checked the rear wheel bearings?

Everything greased as it should be? Prop shaft etc..

Body and engine mounts all tight?

Does it do it in both 2WD and 4WD?

Just ordered a rear wheel bearing kit.
Not sure in 4wd.... Only occurs at the 70-80kph mark so not been at those speeds in 4wd to be honest.
It's not the first time I've heard engine mounts mentioned, I'll check those. Thanks for the suggestions.

 

[CruisinGA]

now hearing that this sound was present before the front wheel bearing replacement I'm jumping on the engine mount bandwagon.

 

[Mark Jennings]

If it’s a rumble, and it’s from the rear, if you do get into the differential to pull the clips and pull the axles for new bearings….. I’d pull the spider gears and make sure they’re in good shape. Also the spiders have a copper coated shim between the axle drive spiders and the carrier….you want to make sure that’s in good condition. In a turn, remember, with an open differential, the axles are turning at different speeds….and the spider gears allow that by slowly rotating inside the ring gear carrier.
If they’re loose or worn, that will give you a low frequency rumble…..

 

[Neilo]

If it’s a rumble, and it’s from the rear, if you do get into the differential to pull the clips and pull the axles for new bearings….. I’d pull the spider gears and make sure they’re in good shape. Also the spiders have a copper coated shim between the axle drive spiders and the carrier….you want to make sure that’s in good condition. In a turn, remember, with an open differential, the axles are turning at different speeds….and the spider gears allow that by slowly rotating inside the ring gear carrier.
If they’re loose or worn, that will give you a low frequency rumble…..

Sound advice, thanks, I'll add it to the list.