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Car Forum / UK Car Forums / 4x4 Cars (UK group) / August 2005Nissan Patrol Vibration
Hi, I have a 1995 Nissan Patrol SLX GR SWB its a 4.2 Diesel and all seems to be in shape BUT has a horrible low rev vibration which dissappears as soon as you are above 1000rpm (ONLY WHEN YOUR MOVING NOT STATIONARY) However I removed the rear prop and drove in 4wd (well front wheel drive) and the vibration dissappeard - However I replced the rear prop with a new one and the vibration came straight back???? I've taken the Vehicle to the Nissan Dealer in Trowbridge Wilts (They knidly charged me £50 to tell me they can't work out what it is and fobbed me off to go elsewhere!) I've also checked all the exhaust system nothing wrong there and all the gearbox mounts etc seem OK..... I'm tearing my hair out and no one seems to have any idea, I can't believe I'm the only person to have had this as its certianly very noticable! Please Please Please someone help - any ideas more than welcome (Although I dont wanna sell it thanks :-) All the brakes/steering etc are sound as a pound, and the suspension feels/looks good??? - I've also jacked the vehicle up and run it on axle stands but without the initial load you dont seem to get the fault?? Thanks guys and gals Dave > Hi, I have a 1995 Nissan Patrol SLX GR SWB its a 4.2 Diesel and all > seems to be in shape BUT has a horrible low rev vibration which [quoted text clipped - 27 lines] > > Dave rear diff? Possibly, BUT I took it to a transmission specialist and theythought it would be very unlikely that the rear diff would only vibrate at low speed like that, and be silky smooth at speed??? I did replace the diff oil and there where no signs of burnt or poluted oil, and no excess of bits on the magnitic drain plug? Is there any way to test the rear diff? > Possibly, BUT I took it to a transmission specialist and theythought it > would be very unlikely that the rear diff would only vibrate at low [quoted text clipped - 4 lines] > > Is there any way to test the rear diff? It sounds to me like a dodgy bearing somewhere between the the transfer box and the rear diff inclusive. It only happens under load, so I'm pretty sure its in the drive train, not suspension or anything else. What about some of the bearings? It might also be in the transfer box, rather than the diff. It be that when you unload the bearings and gears by taking the propshaft off, that you stop some worn parts rubbing together. I'd check your t'box oil and see what's in that. Also, you could jack the vehicle while in RWD, take off the prop shaft, run the engine in gear REALLY slowly and see if you can feel anything on the end of the prop shaft. Make sure somebody is nearby to turn off the engine very quickly if you need them to. You might also be able to turn the t'box output shaft with a wrench and see what you can feel. Get a magnetic telescopic retriever and go fishing in the t'box? No other suggestions I'm afraid except opening up the t'box and rear diff housings and having a good look. Tim Hi, I have a 1995 Nissan Patrol SLX GR SWB its a 4.2 Diesel and all seems to be in shape BUT has a horrible low rev vibration which dissappears as soon as you are above 1000rpm (ONLY WHEN YOUR MOVING NOT STATIONARY) In no particular order. Engine dynamic balancer/crank pulley. Propshaft. A new unbalanced one is not unknown. Bearing in gearbox, especially the transfer box. Is the transfer chain driven with an offset between the rear and front? Free wheel hubs. Diffs or axle drive shafts. If it is the dynamic balancer then it will get worse and probably throw fanbelts at high revs. Huw Guys, Thanks - I'm not convinced it's anything in the Engine as it only happens when your moving - If I add load to the engine by trying to pull away with the hand brake on it doesn't do the vibration... As for the Prop, I've tried 2 and had mine tested, so definatly not the prop.... I suspect as you lot suggest the fault lies either in the transfer box or the rear diff, my question is = How do I work out which one is at fault? - Obviously both still turn when you drive in front wheel drive, but neither the rear output or the input to the diff have any load?? I cant feel any play on either flange??? Help... And Thanks in advance! Dave > Guys, > [quoted text clipped - 14 lines] > > Dave The most practical course of action is inaction until it gets worse and is easier to diagnose. It's a damn machine you see. It is prone to malfunction. Huw Indeed possibly doing nothing was the best plan - however I think the vehicle is going to shake itself to bits, so....... I changed the transfer box over the weekend (boy are the nuts on the end of the main shaft in the transfer box on tight!!! ) AND the vibration was exactly the same...... My question is - what in the diff could be causing this??? I still cant help feeling that bearing in mind it is so rev related its more in the engine???? > Indeed possibly doing nothing was the best plan - however I think the > vehicle is going to shake itself to bits, so....... [quoted text clipped - 6 lines] > cant help feeling that bearing in mind it is so rev related its more in > the engine???? In your last post you said "I'm not convinced it's anything in the Engine as it only happens when your moving - If I add load to the engine by trying to pull away with the hand brake on it doesn't do the vibration..." I still think it may be harmonics but I am not experiencing what you are so can only take wild guesses. Certainly if it was a four cylinder then there could be crank balancer problems which would be more severe and consistent than a harmonic balancer problem on your 4.2. You should be able to isolate the vibration by its speed. Is it relative to revs in isolation or to revs which vary by gear selected or is it relative to road speed only or to road speed and gear selected. Use a simple process of elimination and if that fails.......the only course left is to tear your hair out by the roots. Huw Huw The other thing is I cant believe I'm the only person to have experienced this.... I did find another post on Google Groups, BUT no answer, just another person saying "Yeah I have the same fault" - Shouldn't Nissan have had some knowledge of the fault????? |
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