Troopy very bad vibration 100kp/h

Submitted: Thursday, Jan 28, 2016 at 08:47
ThreadID: 131477 Views:2149 Replies:10 FollowUps:4
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Hi,

After taking my 75 series leaf sprung troopy for some particularly harsh off-roading it's developed a rather harsh vibration at highway speed.

It doesn't feel like the usual kind of shimmy you get from the wheels because the balance is out. It makes the car undrivable at anything above 100kph.

I thought maybe drive line related so jacked her up and had a look. Prop shafts and unis are good, engine and trans mounts are good nothing seems to be out of place, loose or rubbing. The wheel weights are still on the wheels and there are no buckles.
All bushes good, wheel bearings are good, king pin bearings are good.

Am I missing something or maybe it is just the wheel balance?
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Reply By: Rob K (VIC) - Thursday, Jan 28, 2016 at 08:58

Thursday, Jan 28, 2016 at 08:58
I assume you also checked the rims for debris/crap on the inside? If you've been through some muddy areas the mud could have built up on the inside of the rims?

One obvious area not mentioned.

Cheers

Rob K
AnswerID: 595528

Follow Up By: rb30e - Thursday, Jan 28, 2016 at 09:00

Thursday, Jan 28, 2016 at 09:00
Yeah mate clean as a whistle.
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FollowupID: 864231

Reply By: Peter_n_Margaret - Thursday, Jan 28, 2016 at 09:38

Thursday, Jan 28, 2016 at 09:38
Bent or out of balance tail shaft.

Cheers,
Peter
OKA196 Motorhome
AnswerID: 595530

Follow Up By: mike39 - Thursday, Jan 28, 2016 at 10:32

Thursday, Jan 28, 2016 at 10:32
Very inclined to go with this diagnosis.
Could have dropped onto a log or rock, it only takes a few mill. deflection in the tailshaft to create the situation as described.
How much vibration in the gear lever at 100kph?
mike
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FollowupID: 864233

Reply By: MUZBRY- Life member(Vic) - Thursday, Jan 28, 2016 at 09:38

Thursday, Jan 28, 2016 at 09:38
Gday rb
I think you should take the tail shaft off and check to see if a uni has seised. They dont have to be loose to be no good.
Muzbry
Great place to be Mt Blue Rag 27/12/2012

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AnswerID: 595531

Follow Up By: Member - mechpete - Thursday, Jan 28, 2016 at 11:29

Thursday, Jan 28, 2016 at 11:29
hey that happened to me ,
on the Butcher Country trk can remember what I thought was a wheel sliding on a rock .
on the bitumen above 80kph big vibration .
got underneath an noticed a small dent in the rear tailshaft tube , slow trip home
but had it repaired /retubed an all good
mechpete
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FollowupID: 864237

Reply By: Member - M&N's - Thursday, Jan 28, 2016 at 09:44

Thursday, Jan 28, 2016 at 09:44
Hi rb30e just a question on Uni inspection did you actually drop the unis out to check them .I had similar vibration in a Jackeroo years ago and while everything looked good until I removed them and one was very stiff in one plane replaced it and no more problems .You never know hope you sought it .Also might be worth a look that tyres are not out of round tread parted company with case in one spot that sought of thing mickb
AnswerID: 595534

Reply By: Bob R4 - Thursday, Jan 28, 2016 at 09:45

Thursday, Jan 28, 2016 at 09:45
Maybe wheel alignment disturbed.
AnswerID: 595535

Reply By: Ron N - Thursday, Jan 28, 2016 at 13:02

Thursday, Jan 28, 2016 at 13:02
rb30e - Check your tailshaft for missing balance weights, which are usually merely spot-welded or tack-welded into position.
If the weld cracks, the weight is thrown off, and the tailshaft goes out of balance.

Check for a loose diff pinion shaft nut - or a failing pinion shaft shaft front bearing - both of which will make either the yoke or the pinion shaft loose, and create an eccentric wobble in the tailshaft.

You check by grabbing the tailshaft directly in front of the diff and trying to shake it up and down.
If there's movement in the yoke or pinion shaft, then you need to investigate further.

You need to do the same with the transfer case output shaft. The nut on the output shaft yoke may be loose as well, or the rear transfer case bearing could be failing.

All the previous posts are worthy opinions, as well. A whack from a rock can easily bend the tailshaft tubing and cause vibration.

Get it fixed, FAST - as tailshaft vibration imposes dreadful stresses on the engine and transmission and accessories.

As a result of tailshaft vibration that was ignored, I have seen ...

1. Starter motors and alternators fall off, due to the vibration loosening the studs and nuts.
2. Housings, such as bell housing and transmission case housing, seriously cracked, due to the vibration.

Cheers, Ron.
AnswerID: 595545

Reply By: Member - James L8 - Thursday, Jan 28, 2016 at 13:05

Thursday, Jan 28, 2016 at 13:05
G'day rb30e, possible things to check:
- Wheel Rims for dents, build up of mud or loss of balance weights
- Loose wheel nuts
-Prop Shafts for loss of balance weights or dents.
- Universal joints for stiffness etc.
- Shock Absorbers for broken mounts etc
regards Jim
AnswerID: 595546

Reply By: passionfruit - Thursday, Jan 28, 2016 at 13:35

Thursday, Jan 28, 2016 at 13:35
I also have a 75 series Troopy and the same happened to me.Vibrationed over a certain speed.Turned out to be the unis. Glenn.
AnswerID: 595549

Reply By: passionfruit - Thursday, Jan 28, 2016 at 13:39

Thursday, Jan 28, 2016 at 13:39
delete this second reply
AnswerID: 595550

Reply By: rb30e - Thursday, Jan 28, 2016 at 15:54

Thursday, Jan 28, 2016 at 15:54
Hi,

Thanks all for the replies and advice.

There were some scuff marks on the rear tailshaft so I jacked the car and put it in drive. The shaft is pretty rooted! Bout 10mm deflection, to make things worse my troopy has been converted to auto so this is a custom driveshaft I will now have to get remade.

Bummer!
AnswerID: 595553

Follow Up By: Member - Alastair D (NSW) - Thursday, Jan 28, 2016 at 17:43

Thursday, Jan 28, 2016 at 17:43
To do that takes a decent thump. I would carefully check the bearings and oil seals at both ends whilst you are about it.

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FollowupID: 864256

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