Prop shaft removal - tips please!

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Re: Prop shaft removal - tips please!

Postby 4x4 Bus » 23 Jun 2019, 09:02

Have you by any chance changed any gearbox mounts to polly mounts.
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Re: Prop shaft removal - tips please!

Postby lloydy » 23 Jun 2019, 10:49

I could never quite get rid of that 40-45mph vibration with the standard prop. I ended up getting the slip joint one from brickwerks and the difference is amazing, absolutely zero vibration.
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Re: Prop shaft removal - tips please!

Postby irishkeet » 23 Jun 2019, 16:32

Tinium wrote:New prop now on, which has solved the judder when reversing (yes!), but the vibration at 40-45mph remains (noooo!), although it's a bit better than it was.

HarryMann wrote:e.g. might be perfect prop badly aligned or prop connection bringing out a diff or output shaft bearing problem. Just saying.


Oh, and fitting the new prop I put the slider at the front, same as the prop I took off - Is that the recommended direction / would it make any difference fitted the other way round?

Cheers,
Ben.


My slider is at the back which was advised by bricky from memory
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Re: Prop shaft removal - tips please!

Postby Tinium » 24 Jun 2019, 07:29

4x4 Bus wrote:Have you by any chance changed any gearbox mounts to polly mounts.

Will double check with the garage, seen this mentioned on the Samba too as a possible cause.
lloydy wrote:I could never quite get rid of that 40-45mph vibration with the standard prop. I ended up getting the slip joint one from brickwerks and the difference is amazing, absolutely zero vibration.

That's what I've just fitted... :cry:
irishkeet wrote:My slider is at the back which was advised by bricky from memory

OK, will try that next, got to be worth a shot.

Will also jerry rig a laser sight to check alignment as I'm dropping the prop again. Laser tape measure cable tied to diff input, spin one of the front wheels, the centre of the laser "circle" drawn at the engine end should then be where the front diff is pointing. How hard can it be...
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Re: Prop shaft removal - tips please!

Postby jebiga41 » 24 Jun 2019, 09:02

Normally I just loosen the front diff bolts then drive it down the road to allow the diff to find its happy place then tighten the bolts up seems to work ok Not tried them myself but have heard the poly bushes are a factor in vibrations as supposedly too hard.
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Re: Prop shaft removal - tips please!

Postby Tinium » 24 Jun 2019, 09:25

jebiga41 wrote:Normally I just loosen the front diff bolts then drive it down the road to allow the diff to find its happy place then tighten the bolts up seems to work ok Not tried them myself but have heard the poly bushes are a factor in vibrations as supposedly too hard.

Thanks Jebiga41 - can you confirm which bolts before I do anything silly? :) The mounting bolts and side bolts from the Bentley?
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Re: Prop shaft removal - tips please!

Postby silverbullet » 24 Jun 2019, 11:21

FWIW, a laser will not help, since its not possible to truly "align" the drivetrain anyway.
The front diff and transaxle both point flange down, towards the middle of the van and the angles are unequal.
Its a nightmare prop design tbh, quite long for a 1-piece and small diameter for these working parameters.
(Rover had a similar problem with the P6 V8 and introduced a revised prop with out-of-phase UJ yoke angles to induce a reverse harmonic, which cancelled out the drivetrain vibration)

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Re: Prop shaft removal - tips please!

Postby Tinium » 25 Jun 2019, 06:39

Tinium wrote:How hard can it be...

silverbullet wrote:FWIW, a laser will not help, since its not possible to truly "align" the drivetrain anyway.

That answers that then! :D
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Re: Prop shaft removal - tips please!

Postby jebiga41 » 25 Jun 2019, 13:01

Tinium wrote:
jebiga41 wrote:Normally I just loosen the front diff bolts then drive it down the road to allow the diff to find its happy place then tighten the bolts up seems to work ok Not tried them myself but have heard the poly bushes are a factor in vibrations as supposedly too hard.

Thanks Jebiga41 - can you confirm which bolts before I do anything silly? :) The mounting bolts and side bolts from the Bentley?
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yep they are the ones just keep it in a straight line so it sits ok it may make some noises but once you tighten it up again its ok
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Re: Prop shaft removal - tips please!

Postby Tinium » 25 Jun 2019, 15:23

jebiga41 wrote:yep they are the ones

Thanks - Having just stripped the first flange nut, I'm going to try that before swapping the prop round. It's turning into one of those jobs :shock: Could be worse I guess... could have stripped the last nut.
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Re: Prop shaft removal - tips please!

Postby jebiga41 » 25 Jun 2019, 15:39

plenty of penetrating oil :wink:
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Re: Prop shaft removal - tips please!

Postby silverbullet » 25 Jun 2019, 16:48

3/4 drive full sockets ;)

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Re: Prop shaft removal - tips please!

Postby Aidan » 25 Jun 2019, 18:01

silverbullet wrote:3/4 drive full sockets ;)

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I think Ian means 1/4" drive thin-wall hex socket and 3/8 adapter and wobble bar and decent spanner for the prop bolts or 2 x snap-on/quality spanners
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Re: Prop shaft removal - tips please!

Postby silverbullet » 25 Jun 2019, 18:13

Yes...why I thought he was removing the flanges from the diff or gearbox I do not know :D
They would take some rounding off!

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Re: Prop shaft removal - tips please!

Postby Tinium » 26 Jun 2019, 09:57

Aidan wrote:I think Ian means 1/4" drive thin-wall hex socket and 3/8 adapter and wobble bar and decent spanner for the prop bolts or 2 x snap-on/quality spanners


Thanks Aidan, will give that a go - only got a 3/8" 13mm socket, so will track down a 1/4" thin wall :)

Did the loosen mounting bolts-drive-tighten method, was better at 45 but worse at 35 whilst driving with the mounts loose, ran out of time to do a tightened up test drive, will find out tonight if it's made any difference... here's hoping.
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