Naks

unfortunately sending it back to the UK is not really an option. I will take it to the chap who imports them, he probably has more experience with working with diffs

with the rear prop removed, all noises/vibrations are gone, so it's definitely something on the rear diff/axle

gents, another update on this ongoing saga: after the new crownwheel + pinion were fitted, the droning noise was still there, so the indie took out the ATB and fitted the original diff, and claimed the noise(s) were gone. Picked up the landy just after lunch and noticed that between 0-60kmh, there is a high-pitched whine coming from the rear, similar to the jet whine you can hear when a plan is about to land. Above 60kmh, the whine disappear, and once I get up to 80kmh+, there is still a loud droning noise + vibration coming from the rear. I'm now at a loss regarding this issue (and I'm pretty sure so is my indie), so any recommendations on how to tackle this issue will be much appreciated. thanks!

these might come in handy for some Range Rover/Sport L320/L322/L494 Workshop Manual: http://bit.ly/2iH7jgG

Yeah, it is likely, as this was the first ATB they had ever worked with... if this was their fault, that's the first time in 10 years/4 vehicles that they might have messed up...

Just got an update from the workshop: they fitted a new crownwheel + pinion and the problem is gone, plus one of the bearings was not sitting properly (not too sure about the exact terms). the original diff was replaced by LR after about a year of ownership, so not sure if that was not done properly, and after 9 years it finally went over when the ATB was installed? my indie says now that the droning noise from the diff is gone, there's a 'squeaky' noise that's appeared, and he thinks there's a bearing in the gearbox that needs inspecting

Just spoke to my indie and he says all the adjustments were done during the fitment... so he's going to take it out and inspect it. I kept the original diff, so we have the parts if the diff carrier needs to be replaced.

Thanks Dave, will get him to check that asap! Sorry, my mechanical knowledge is zilch, so I thought the runout & backlash were the same thing.

Thanks, Car was serviced on Monday, diff oil was changed after 1000km on the ATB - no noticeable particles. I removed the rear prop and had it tested, no issues. All tyres were balanced today as well, to rule out tyre wear. Ashcroft say it's probably the backlash on the crownwheel & pinion.

Thanks Bowie, bearings were replaced when the ATB was installed. My indie used Timkem ones, IIRC.

Hi chaps, I'm hoping someone here can help me with an issue I'm having on my Puma I fitted an ATB in the rear of my Puma in October 2017, and recently started noticing a groaning noise that's becoming quite bad. My indie and I eventually traced it to the rear diff: at specific rpm/speed, there is a loud, low-frequency groaning noise + vibration emanating from the rear of the car. It almost feels as if the seats have built-in massage function, especially when I hit 80-100kmh. Has anyone else experienced this after fitting an Ashcroft, and if so, how did you fix this? thanks

Gents, thanks for the suggestions. not sure how I missed this symptom: if I open the throttle and keep it constant, the revs drop to idle and then slowly try to climb back. the revs drop faster when the engine is cold than when warm, but it happens in either situation. does this make the diagnosis any clearer? thanks

Thanks, others are also saying it's most likely the glow plugs, will check these out!

*bump*

Hi chaps, I'm hoping someone can give me some insight with an issue I have been having on the Puma since winter started. On cold starts, the vehicle is spouting massive clouds of white smoke (looks like the exhaust is vaping), and the idle shakes the entire vehicle - almost like the engine mounts are gone. As soon as the engine is a bit warm, then the symptoms disappear. There is also no loss of power or anything weird with the power delivery. The common cure is to change the VCV valve, which I did, and I also did the pump re-learn + pilot correction. But the problem persists, and I'm leaning towards a fuel rail temperature issue. Can anyone tell me whether the fuel rail temperature shown in this screenshot is normal at 10C ambient? I'm running a tank with Wurth diesel purifier in case the injectors are clogged, but that is not the case so far. Or if anyone else has any suggestions? Appreciate any help, thanks