Thread: Cyclic rumble in first and second gear

So vehicle stationary, transfer in neutral and going through the gears, the noise is there in every gear. Just gets fast going to a higher gear. That obviously rules out diffs, U-joints, and all the transfer case except the input shaft assy...at least as far as I can see that would be the case.

The oil is very clean, and no metal flake on the plug.

Apart from the input shaft, is it possible that a clutch issue, or gearbox, or gearbox extension shaft (which was replaced with the Ashcroft fix) could refer noise to the transfer? Probably more play in transfer than gearbox. Maybe someone more experienced than me might have some ideas?

Can anybody recommend a good Land Rover mechanic on Brisbane west side?

Don't know of any in the western suburbs. I had diff rebuilt by a mob at Everton Park and whilst there they diagnosed a gearbox problem that I couldn't hear so I was suitably impressed with their diagnostic skills... Dantrans was the name if I remember correctly... They were on queens rd

Thanks for that referral, Incisor.
I spoke with DanTrans, and having relayed the above information, they said it would almost certainly be a clutch issue. If the transfer case noise is only present at low revs, and seems fine at higher speeds, it's not the gearbox or transfer case. Transmission noise would only get worse. It's very common for clutch issues to refer the noise to transmissions.
I was at a stalemate not wanting to pull the transfer case apart again when it looked good, and not wanting to replace the clutch without being sure.
Cheers
Brid

Originally Posted by Brid

So vehicle stationary, transfer in neutral and going through the gears, the noise is there in every gear. Just gets fast going to a higher gear. That obviously rules out diffs, U-joints, and all the transfer case except the input shaft assy...at least as far as I can see that would be the case.

The oil is very clean, and no metal flake on the plug.

Apart from the input shaft, is it possible that a clutch issue, or gearbox, or gearbox extension shaft (which was replaced with the Ashcroft fix) could refer noise to the transfer? Probably more play in transfer than gearbox. Maybe someone more experienced than me might have some ideas?

Is it a constantly increasing noise as you increase road speed or changes with engine speed as you change into each gear but more intense at higher speeds (like it restarts in each new gear)?

If it is constantly increasing that mostly rules out input shaft on gearbox because that will change with engine speed. That leaves you with as you said your output shaft in the gearbox, adaptor and input into TC and, importantly, also your intermediate shaft in the TC. When you are spinning through the gears with the TC in neutral only the output shaft is stationary.

I just had a bearing going on my intermediate shaft a year and 5000km after rebuild. It made a whining noise that increased with road speed and was much more intense in low range.

If you can, drop the TC out and then try rev it through the gears - that will isolate it to gearbox or TC end, and you can go from there.

Originally Posted by Brid

Thanks for that referral, Incisor.
I spoke with DanTrans, and having relayed the above information, they said it would almost certainly be a clutch issue. If the transfer case noise is only present at low revs, and seems fine at higher speeds, it's not the gearbox or transfer case. Transmission noise would only get worse. It's very common for clutch issues to refer the noise to transmissions.
I was at a stalemate not wanting to pull the transfer case apart again when it looked good, and not wanting to replace the clutch without being sure.
Cheers
Brid

Oh as an aside, I also did clutch while in there - similar-ish symptoms, a rattly rumble that wasn't present so much in neutral revving. Similar puma 2.4, the early ones had rubbish springs so sounds like you may have found your culprit.

Put a decent clutch in with good springs - I went with LOF which are gaining popularity.

Originally Posted by carpdvl

Is it a constantly increasing noise as you increase road speed or changes with engine speed as you change into each gear but more intense at higher speeds (like it restarts in each new gear)?

If it is constantly increasing that mostly rules out input shaft on gearbox because that will change with engine speed. That leaves you with as you said your output shaft in the gearbox, adaptor and input into TC and, importantly, also your intermediate shaft in the TC. When you are spinning through the gears with the TC in neutral only the output shaft is stationary.

I just had a bearing going on my intermediate shaft a year and 5000km after rebuild. It made a whining noise that increased with road speed and was much more intense in low range.

If you can, drop the TC out and then try rev it through the gears - that will isolate it to gearbox or TC end, and you can go from there.

You would not need to drop TC, just pull the intermediate shaft.

I don't understand how a clutch could make a cyclic noise , or any noise if it engaging properly.
a little pressure on the clutch h pedal should eliminate any throwout bearing noise & you should feel a crook bearing through the pedal.
A faulty DMF I could understand, but I thought Pumas had a solid flywheel.

Sorry for delay in response, and thanks for comments. Oil back in transfer and time for more testing. Noise cycles increase with road speed. Tfer in neutral increased with engine from and higher gear.
Today I was able to hear cycling the first time, cycling noise with main box in neutral.
Put clutch in and noise gone. Still there with pressure on clutch pedal, but gone when disengaged.
Would that narrow it down to clutch or main box input?