80 Series Gearbox Knock

BOHDI 1972; i'm just wandering if that noise you're talking about might be the thrust bearing behind the clutch plate?these tend to rattle when the bearing is worn.


could be worth checking out.

Cheers for the advice Stu & Bob.
I will drain and change the oil on the weekend and see what happens. You don't happen to know the best grade oil for the Landy's do ya. I will also try and find the modification pic's somewhere, could be worth checking out.

HiYa Bodhi, This is what you want >>>>>>>>>>>>>>

http://cgi.ebay.com.au/Landcruiser-Bypass-Hose-Gearbox-Transfer-Case_W0QQitemZ350078140735QQihZ022QQcategoryZ6763QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262

>>>>>>>>Copy the link and paste to your browser. Link starts with http ends at the numbers 262. I had one on my hilux.........

Regards Steve M

Sorry Bodhi, also meant to say this picture/website is an example only of what you need. You need to check what model you require. I have dealt with this supplier before on ebay and had no problems what so ever. Might pay for you to email them to make sure you get the correct one for your cruiser. Hope all goes well with it. Easy job also to fit yourself. regards steve M

Best oil is the Castrol VMX-M 75/85
I would be surprised if you were pumping oil between gearbox and transfer, given I think you have the H150F gearbox.
The common LandCruiser Thrust bearing high cheeping noise is eliminated with light clutch pressure, so is easy to pick. That is not your problem.

Older LandCruiser gearboxes commonly make a rumble noise in neutral - sounds like what you are experiencing - its just wear and tear, and is not usually a sign of imminent failure. I think your mechanic is right - its not worth chasing. You can usually make it quieter with thicker oil, but your gear changes will become intolerably slow.

You could be right Phil. I have never touched an 80 series box but I worked on plenty of new 60 series and I assume they are much the same. They were notorious for having a gear box rattle from new which Theiss Toyota called "roll over" noise. I even fitted a complete set of new gears in one with only 3,000 ks on it after the owner kicked up a hell of a fuss but it made no difference at all.

The diesel was the main offender when new but I would imagine it could become much more noticeable in a petrol once it got a few ks up.

Bodhi

The noise I am talking about is caused mainly by clearance between the gears and was most noticeable at idle when the box was warm. The oil was thicker when it was cold and stopped most of it which is probably why you can't hear it at idle. By the time you get to work it is hot and thinner so the noise comes in. Putting your foot on the clutch disconnects the gear box so the gears stop spinning and the noise stops. At about 1300 rpm the engine is running much smoother than it is at idle and this coupled with the speed of the gears stops the noise.

Providing there is no noise while driving under load and particularly when slowing down through the gears under engine breaking, then your mechanic is probably right.

Brian

Thanks very much to you all for your help. Haven't changed the oil yet but will be tomorrow.
I will keep you posted on the outcome.
Cheers.

PS. Brian you have explained it ver well. Exactly what is happening.
Hopefully my mechanic is right.
Have a good one.