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 Have Removed Front Drive Shaft AWD [experiment]

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Fang
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PostSubject: Have Removed Front Drive Shaft AWD [experiment]   Tue Dec 13, 2016 12:09 am

Hello. I have a 1996 supercustom 3litre AWD turbo diesel .
Recently I noticed a slight leak from the Viscous Coupling output spline that feeds through a driveshaft to the front diff.
First of all I would like to ask where in Australia can I buy the special oil/fluid required for the viscous coupling, and also where can I buy the seal.?.
While I had the drive shaft disconnected I went for a drive to see what would happen.
Very interesting result. The drive system was completely normal for a few minutes, but felt much better in the steering, cornering ect.
But , that did not last long.
Soon a screeching noise plus hesitation in take up and acceleration developed, which quickly got worse.
So I returned home and reinstalled the drive shaft and everything is back to normal.
I believe the whirring screeching noise is the front drive shaft spinning at very high rpm as the viscous coupling tries to even out the front rear drives.
I believe there would be a significant improvement in economy if it could be run on RWD only.
But, how to do it is the question I ask. ?
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Hiace4wd
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Model and year : 1994 Toyota Hiace 4x4 DIY camper
Registration date : 2016-02-01

PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Tue Dec 13, 2016 8:31 am

Well, how to do it is to take a different gearbox or better yet, different transfer case.

Because most of them just have a typical parttime 4x4 system (like my van) in which case you drive rear wheel drive, and just engage 4wd when you need it (with a button on the dash).
This means a fixed connection between front and back, in which case you can easily remove one of the propshafts/driveshafts. I did that once with a Landcruiser and continued in front wheel drive Razz

Do you have the model code for your van? It is on the grey plate under the bonnet. Should be something like KZH113-......
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Fang
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Tue Dec 13, 2016 11:38 am

Yes, well mine is an auto AWD with no means to control the viscous coupling drive.
its a KD-KZH106G-JRPET.
Engine is a 1KZ-TE.
Getting the fluid is somewhat difficult, but I have been steered towards a farm machinery service centre, as apparently viscous couplings are widely used in tractors etc.
but that could be fraught with danger as not all oils are the same, and a mistake could be costly.
Toyota cannot help me with the shaft seal, and they don't carry the fluid at all.
So, its very interesting atm. Cheers.

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Hiace4wd
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Tue Dec 13, 2016 2:16 pm

Don't you have an original manual that came with the car? It should say which oil should go inside.
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Fang
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Wed Dec 14, 2016 2:02 am

I was able to make contact this morning with a Company in Perth western australia that has dealt with, and imported supercustoms for some 20 years, so here, pardon the pun, is the good oil.
No wonder that I could find no info on the type of oil/fluid that goes into the awd viscous coupling.
It just takes ordinary old diff oil.. No fancy stuff, just plain diff oil.
And they have the seals in stock.
I tend to believe them because that is the smell of the oil in the coupling. just smells like diff oil.
So, problem solved for me. But, I do stress that you do your own research before putting diff oil into a supercustom awd coupling. I take no responsibility if the info I have posted in good faith is incorrect. Cheers.

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Laurie86
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Thu Nov 01, 2018 11:54 pm

Hey guys, just signed up for the forum, have owned and travelled a super custom for the past year around Australia. Vibrating sound when accelerating, apparent around 60 kmh, worse on higher speeds. Look like I'll need to replace CV drive shafts, trying to locate some atm. Are they interchangable with Hilux surf? Thank you!
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GPW
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Model and year : Model: KD-KZH100G-MRPGT
Year: 1996
Colour: 4K1
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Fri Nov 02, 2018 7:32 pm

I would doubt interchangeability, but if you have yours out and can manually compare you'll know.

I'd also caution about accurate diagnosis, mainly because I'm not very good at it myself: it should be possible to tell if there is something wrong with the old shaft before trying to change it, not sure how you'd tell though.

I'd also check all wheel bearings and tyre balances first.
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Laurie86
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Fri Nov 02, 2018 10:27 pm

Thanks G, I had two competent mechanics look at it and they both suggested it's the front drive shafts so will get on sourcing some "somehow" dont know yet exactly how. Maybe try to have these fixed in a machine shop specializing in drive shafts
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GPW
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Home City : Cambridge, UK
Model and year : Model: KD-KZH100G-MRPGT
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Registration date : 2016-07-16

PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Fri Nov 02, 2018 10:38 pm

May also be worth checking with Toyota themselves, they seem pretty good in the UK at getting stuff and some comes from Japan when it's not in stock here.
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Laurie86
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Thu Nov 08, 2018 6:10 am

@Fang would you please name that Perth company tha imported and dealt super customs for 20 years
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MalL
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PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Fri Nov 09, 2018 9:57 pm

I have a vague memory of reading about vibration problems being caused by driveshafts being "out of phase". A brief search came up with this article. Perhaps it's something worth checking?
https://forum.ih8mud.com/threads/alignment-of-driveshaft-yokes-mystery-vibrations.220571/
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GPW
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Home City : Cambridge, UK
Model and year : Model: KD-KZH100G-MRPGT
Year: 1996
Colour: 4K1
Trim: FN42

Registration date : 2016-07-16

PostSubject: Re: Have Removed Front Drive Shaft AWD [experiment]   Sat Nov 10, 2018 11:03 am

MalL wrote:
I have a vague memory of reading about vibration problems being caused by driveshafts being "out of phase".  A brief search came up with this article.  Perhaps it's something worth checking?
https://forum.ih8mud.com/threads/alignment-of-driveshaft-yokes-mystery-vibrations.220571/

Very interesting knowledge there.
I suspect the alignment would apply to all prop-shafts including the big one in the middle, but mainly to ones whose UJs drive an angle.

The effect may be due to the non-constant velocity of UJs as opposed to CV joints.

Very interesting.
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