Patrol GQ rattle

Submitted: Friday, Jan 24, 2003 at 21:36
ThreadID: 3080 Views:2583 Replies:6 FollowUps:2
This Thread has been Archived
I have a 1990 Patrol 4.2 diesel.When it is idling in neutral there is a distinct rattle coming from gearbox/clutch area.If revs are increased to 1000 rpm or over rattle disappears, aswell if you put your foot on the clutch.The problem seems to be alot more prominent when cold and virtually disappears when hot."Can anyone tell me if its perhaps the clutch rattling or the gearbox and if the clutch is about to give up"?
The vehicle has done 315000 Kms.It also has that annoying vibration when under load between 700-1100 rpm, more so than 3 other patrols I have been in.(infact one 1988 model had absolutely none!)
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Reply By: zigglemeister - Friday, Jan 24, 2003 at 21:40

Friday, Jan 24, 2003 at 21:40
I'm not a Patrol owner, but it sounds like a clutch throwout bearing to me...
Tim Z
AnswerID: 11823

Reply By: Truckster - Friday, Jan 24, 2003 at 23:09

Friday, Jan 24, 2003 at 23:09
Id go with Ziggle on this one. the bearing.

there have been a few discussions on the Patrol list about this, I have an Auto, so my only problem is $4000 to rebuild if it dies.


search the archives here for the patrol list URL and jump on, theres 650 others there with Patrols.
AnswerID: 11835

Follow Up By: Nugget - Friday, Jan 24, 2003 at 23:49

Friday, Jan 24, 2003 at 23:49
If it's the release bearing why doesn't it make any noise when I put my foot on the clutch?
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FollowupID: 6764

Follow Up By: Frog - Thursday, Jan 30, 2003 at 10:07

Thursday, Jan 30, 2003 at 10:07
Because when you put your foot on the clutch, the thrust bearing (throw out bearing) is under load and any slack is taken out. If the bearing is only slightly worn or as in my case dry, it only makes a small whining noise. If its completely r/s it's unbearable.
0
FollowupID: 7023

Reply By: Eric - Friday, Jan 24, 2003 at 23:16

Friday, Jan 24, 2003 at 23:16
Nugget.
When a diesel is idling it speed is not constant, it speeds up a slightly each time a cylinder fires then slows down agian, when the gears are worn they are able to spin very freely so they rattle when the speed varies. Dont wory it will not let you down. Eric.
AnswerID: 11837

Reply By: IAMGQ - Saturday, Jan 25, 2003 at 02:16

Saturday, Jan 25, 2003 at 02:16
Finally I 've found another diesel GQ doing the same thing as mine!
Mine is 93 340000k ......... The problem has been going on for 3 months since i got it. Firstly I also suspected the release bearing....but since the rattle is gone once it is hot, then I would think the problem may be from the input shaft bearing of the gearbox. As when clutch on, gearbox disconnect, no rattle.........................
when clutch off, drive input shaft.....bearing rattle...................and as it gets hot, everything goes smoothly..............no rattle....

Another possible cause may be due to the slightly lower of rpm when engine is cold. (around 700 rpm)

Anyway, I would not worry too much as everything is still running well except the well known annoying vibration when it is at low rev band.
AnswerID: 11841

Reply By: Andrew - Saturday, Jan 25, 2003 at 14:04

Saturday, Jan 25, 2003 at 14:04
g'day nugget,

I have the same in my 96 gq 2.8 td, 125000 k's. I was concerned about it when i first got it. I have been assured not worry about it, first from mechanic mate, and also from nissan service techs. Hey its a patrol, its not gonna break.

Andrew..
AnswerID: 11853

Reply By: kezza - Sunday, Jan 26, 2003 at 02:05

Sunday, Jan 26, 2003 at 02:05
May also be the springs around the clutch plate rattling when cold and expanding enough when hot to take up the slack at 300,000ks a common rattle
kezza
AnswerID: 11863

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