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JackNorris

Member Since: 16 Mar 2020
Location: UK
Posts: 58

Defender Grind just before change

Hi all

Started hearing an interesting noise

Defender 90 300tdi with standard d1 gearbox

Finding that when driving in 2nd or third, if you hold the gear to the point when you’d change there is a slight grinding noise. This subsides if you keep the power on

It only happens in 2nd or 3rd

Clutch seems fine and isn’t in use at this point

Hard to describe so happy to answer anything to make it easier to understand

Thanks

23rd Sep 2023 1:50pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Quote:
Defender Grind just before change
Hi all

Started hearing an interesting noise

Defender 90 300tdi with standard d1 gearbox

Finding that when driving in 2nd or third, if you hold the gear to the point when you’d change there is a slight grinding noise. This subsides if you keep the power on

It only happens in 2nd or 3rd

Clutch seems fine and isn’t in use at this point

Hard to describe so happy to answer anything to make it easier to understand

Hi Jack.

So you have a 300tdi 90, so it will have an R380 5 speed main gearbox and when you say D1 gearbox I suspect you mean the Discovery transfer gearbox (LT230) with 1:1.22 gearing (as opposed to the standard Defenders which is 1:1.44 gearing).

If you are getting grinding whilst changing gears it is generally a sign that the baulk (aka synchro) rings have worn. This is sometimes made easier by changing gear whilst at higher rpm as it allows the synchro assembly to slip and align on the dog teeth. This is fairly common and the solution is to refurb the gearbox components.

Or do you mean that whilst in second or third gears you are getting a grinding noise at the top end of the gear prior to needing to change gear?

24th Sep 2023 9:25am

JackNorris

Member Since: 16 Mar 2020
Location: UK
Posts: 58

Thanks for the reply and the information, very helpful

The actual gear changes are absolutely fine and it’s just at the top of the gear range for a very short period and continuing accelerating will stop the noise

Thanks

24th Sep 2023 1:04pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Ahhh ok so it is a grinding at the top end of the gear. Ok, it is unlikely to be anything in the gearboxes as you hear or feel something more of the time. I suspect it could be an imbalanced propshaft and or dry/worn UJ. These can produce noises or feelings that come and go with RPM. An example might be that your rear prop has shed its balancing weight.

Out of interest do you have a lift kit installed on your 90?

24th Sep 2023 1:43pm

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