SJ noisy final drive

djc · Post by **djc** » Sat Mar 18, 2017 8:47 am

Hi all, sorry been away from here, busy but the 85 SJ going good, generally.
(This is a 2wd road condition)
Have a noise - at low speeds: take foot off accelerator but leave clutch engaged (so engine is braking a bit) - sounds rough, a bit graunchy. Drop the clutch and freewheel, all is calm, noise gone.
I have a guess there is excess rotational play somewhere in the drivetrain, and the noise is a sort of rotational resonance between engine and back wheels. I should check diff play and UV joints first I think.-?-
I'm tempted to start at the back and work forward - back axle/diff is 410. How much rotational play on the input shaft, anyone know the right amount or an acceptable tolerance please?
I'm pretty sure the gearbox and T-case are good.
Ideas and advice appreciated as always.

Post by **Jordi** » Sat Mar 18, 2017 9:01 am

Clutch release bearing is my guess. Given the noise goes when clutch is pressed.

zook123 · Post by **zook123** » Sat Mar 18, 2017 5:20 pm

Jordi wrote:Clutch release bearing is my guess. Given the noise goes when clutch is pressed.

I'll second that, mine was the same until I stuck a new clutch in.

andyrew · Post by **andyrew** » Sat Mar 18, 2017 10:05 pm

Possibly a uj? Does it do it when accelerating?

Would be a bit quick for the thrust bearing to fail unless its a faulty part.

andyrew · Post by **andyrew** » Sun Mar 19, 2017 12:59 am

Also, is it at any particular speed, rpm or in a certain gear?

djc · Post by **djc** » Sun Mar 19, 2017 4:34 pm

Hi Andy - it's low speeds, in traffic or dropping from say 30 to stop. We put a new clutch in only about 1k miles ago (well, you did really !).
Fine accelerating, it's only when engine is acting as a brake, then disconnect engine (drop clutch), all fine again.

Suzuki Club UK

SJ noisy final drive

SJ noisy final drive

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Re: SJ noisy final drive

Re: SJ noisy final drive

Re: SJ noisy final drive

Re: SJ noisy final drive

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