Simon_CSK Posted February 23, 2016 Share Posted February 23, 2016 Have quite a bad drone from the back of the P38. Initial thoughts were a wheel bearing but changed that today and the drone is still there. Am now thinking it is the rear diff on its way out . How do I verify this? Quote Link to comment Share on other sites More sharing options...
Nigelw Posted February 24, 2016 Share Posted February 24, 2016 Pull it out and replace with known good one or get yours rebuilt. Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted February 24, 2016 Share Posted February 24, 2016 Sample the oil,if its all silvery with metal particals its on its way out. If its still reasonably clean it will probably go on for a while.I have a customer with a 4ltr P38 that has had a noisy rear diff for the last 4 or 5 years,but it does a low annual mileage and hasn't got any worse... Quote Link to comment Share on other sites More sharing options...
duncmc Posted February 24, 2016 Share Posted February 24, 2016 It could be a brake caliper binding too, I had this on my Sport recently. I did think it was a wheel bearing at first. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted February 24, 2016 Author Share Posted February 24, 2016 Sample the oil,if its all silvery with metal particals its on its way out. If its still reasonably clean it will probably go on for a while.I have a customer with a 4ltr P38 that has had a noisy rear diff for the last 4 or 5 years,but it does a low annual mileage and hasn't got any worse... It is far too noisy to keep going with it any longer. It really is very loud at anythihg over about 25mph. Will havea look for the metal particles It could be a brake caliper binding too, I had this on my Sport recently. I did think it was a wheel bearing at first. Brakes definately ok as just got it back from garage after a rear pad fell out and wreaked a disc and a caliper. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted February 24, 2016 Author Share Posted February 24, 2016 Pull it out and replace with known good one or get yours rebuilt. I have a few good ones kicking about but it is not a job that I enjoy. Guess I will need to do it though. I can't have another trip on the big yellow truck as I have had four call outs resulting in two lift in the last two weeks on the Discovery. The fault on that turned out to be a dead fuel pump. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 19, 2016 Author Share Posted June 19, 2016 Update......The drone in the last week was so bad I decided that it was the diff and went to replace this morning. As soon as I touched the prop to start to remove the bolts I noticed significant play on the diff at the connection with the prop. Result, I knew before I started that I had found the fault. Stripped out the diff and sure enough the bearings were away and there was 4 teeth missing on the crown wheel. Now all back together so hopefully this cures all my woes. Time will tell. Quote Link to comment Share on other sites More sharing options...
duncmc Posted June 19, 2016 Share Posted June 19, 2016 That bad eh? Hopefully your whine will be gone. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 19, 2016 Author Share Posted June 19, 2016 That bad eh? Hopefully your whine will be gone. Took it for a drive this afternoon and yes all is quite.......at last. Could not believe how bad the old diff was, luckily I had (several) spares. Quote Link to comment Share on other sites More sharing options...
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