Vibration TD42

Submitted: Sunday, Aug 10, 2003 at 14:38

ThreadID: 6476 Views:5750 Replies:5 FollowUps:7

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Member - John

I have a 1990 TD42 Patrol with 180,000 Km on clock. Has an annoying vibration around 1000 to 1200 RPM mark and then disappears. No sign of it while on the highway. A real nuisance as it is just where one creeps along in many situations - particulary when towing slowly just after getting under way, in towns etc. Have fitted new clutch and also new bearings to the gearbox - still there. Had engine and gearbox mounts checked and supposedly OK. Seems to be harsh on idle - I feel too much vibration inside the vehicle. My first experience of a diesel. Any help will be appreciated.

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Reply By: ramp - Sunday, Aug 10, 2003 at 16:04

Sunday, Aug 10, 2003 at 16:04

sell it and buy a 3.0l

AnswerID: 27345

Follow Up By: Member - Chris (Wollongong) - Sunday, Aug 10, 2003 at 17:29

Sunday, Aug 10, 2003 at 17:29

Why??? So you can then have problems of a different kind.

FollowupID: 18831

Follow Up By: Andrew(WA) - Sunday, Aug 10, 2003 at 22:24

Sunday, Aug 10, 2003 at 22:24

Well said ramp..:-)

FollowupID: 18853

Reply By: Member - Geoff - Sunday, Aug 10, 2003 at 16:49

Sunday, Aug 10, 2003 at 16:49

John,
Have you checked all the universal joints and bolts properly, just make sure that you haven't got one that has a stiff spot in it.
Cheers geoff.

AnswerID: 27347

Follow Up By: Member - John- Sunday, Aug 10, 2003 at 19:44

Sunday, Aug 10, 2003 at 19:44

Thanks Geoff! Will have them checked out.
John

FollowupID: 18835

Reply By: Martyn (WA) - Sunday, Aug 10, 2003 at 21:49

Sunday, Aug 10, 2003 at 21:49

John,
Some things to try and also look at. By the way, is it at these revs in all gears? OK, look for balance weights on the wheels missing especially if you've been doing a bit of off road, check the prop shaft splines are moving and not seized, check for mud behind the rims where you can't see, you could also move the prop shaft through 90 degrees I suspect it was moved when the clutch was replaced, universal joints, as mentioned by someone else. The vibration is a harmonic vibration by sounds of things, if it's the engine that vibrates it may be worth checking the harmonic balancer on the crankshaft pulley. It's an outside chance but when I bought my GQ it had the older style of engine mounts that when they where worn the metal tab used to hit the chassis rail and give me a hum dinger of a vibration, the later mounts have had these tabs removed. That should do for a start. Something else to do would be put the transfer case in neutral and try the gears again, see if you get the vibration again, the best bet up front is to try and isolate where it's coming from. I also take it that the vibration is when the transfer case is in 2wd, is that right?

AnswerID: 27390

Follow Up By: Member - John- Monday, Aug 11, 2003 at 13:48

Monday, Aug 11, 2003 at 13:48

Martyn, Yes the vibration is in all gears at the same engine revolutions. Yes the transfer case is in 2wd. Will check to see if the engine mounts are of the early type because that is the impression one gets that it's the engine vibration being transmitted to the body. Have had them checked to ensure not broken and they were OK.
Regards JohnPatrol TD42 Diesel

FollowupID: 18887

Reply By: Andrew(WA) - Sunday, Aug 10, 2003 at 22:30

Sunday, Aug 10, 2003 at 22:30

John

I had exact same problem as you explained in a 4.0 ltr cruiser some years back.

After months of trying everything it turned out to be the harmonic balancer.

Drove as sweet as barley suger after the replacement. My vibration was at @ 2500rpm.

cheers

AnswerID: 27394

Follow Up By: Member - John- Monday, Aug 11, 2003 at 13:52

Monday, Aug 11, 2003 at 13:52

Andrew,
Your comment also agrees with Martyn re the Harmonic Balancer. How do you do a specific test for this - any ideas? Am I in the hands of the mechanics guess?
Regards JohnPatrol TD42 Diesel

FollowupID: 18888

Follow Up By: Andrew(WA) - Monday, Aug 11, 2003 at 15:56

Monday, Aug 11, 2003 at 15:56

John

I discovered it by accident. Noticed minor oil leak from the balancer which slowly got worse. When I had it fixed, had to replace the balancer(for what reason I can't remember) and that was the end of the problem.
Pure arse.

FollowupID: 18901

Reply By: colin - Monday, Aug 11, 2003 at 13:39

Monday, Aug 11, 2003 at 13:39

The vibration is normal chatter for a GQ working at those revs, the 4.2 doesnt like working at that range. I solved the problem by fitting a supercharger which gives more tourge in the lower revs ie right from idle, a turbo wont solve the problem as it doesnt start working till 1500 plus revs, my patrol has done 260,000 ks and have never had any drive line problems from this vibration. Goe to a car yard and take a GQ for a drive and compare. Col

AnswerID: 27440