1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

P38A Bit of a wobble

Discussion in 'Range Rover' started by Ginger Tom, Jan 11, 2019.

< Previous Thread | Next Thread >
  1. Ginger Tom

    Ginger Tom Member

    Joined:
    Nov 19, 2018
    Posts:
    16
    Likes Received:
    4
    Location:
    Bedfordshire
    Morning all,

    Since owning the P38 it's had a wobble.

    First though was the prop-shafts, checked and found that the front u/j's were out of line, sorted that and the wobble was subdued, still there but less so.

    Checked the tyre, found scalloped, presumably from the imbalance of the prop-shaft. Thanks to a blow out when green laning it's now had four new boots and the wheels have been rebalanced so that negates it being the tyres.

    Again changing the tyres has subdued the wobble further but it is still there.

    The wobble is at its worst from 50-55mph stops between 56-60mph and then it's back but to a lesser extent.

    Has anyone else had this, going through this atm, got any other ideas as to what it could be???

    Cheers

    Tom
     
  2. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    30,717
    Likes Received:
    867
    Location:
    Near Poitiers SW France
    Common problem, what size wheels and make of tyres are you running?
     
  3. Saint.V8

    Saint.V8 Dyed-in-the-wool 100% RR Junkie

    Joined:
    Apr 27, 2008
    Posts:
    15,595
    Likes Received:
    1,585
    Location:
    Surrey - Near the middle, close to some green bits
    As above the P38 is very susceptible to tyres, size and pressures.....especially when running 18" ...... the pressure need to be spot on and at times not what the book says and it is a case of trial and error till you get a reading that rides well.....then when you change tyres, you have to do the whole trial and error again!
     
    Mukiwa likes this.
  4. tomcat59alan

    tomcat59alan Well-Known Member

    Joined:
    Apr 3, 2011
    Posts:
    10,182
    Likes Received:
    1,828
    Location:
    wirral and triquivijate
    Where do you feel the wobble?, keep it clean, if it's through the steering wheel, how's your steering damper?
     
  5. DanClarke

    DanClarke Well-Known Member

    Joined:
    Mar 13, 2009
    Posts:
    2,333
    Likes Received:
    1,928
    Location:
    Benfleet, Essex
    I've found "wobble" on mine in the past and have always attributed it to poor balancing or a "missing" weight. Always started at c.55MPH and disappeared at around 65MPH.
    There's stuff on You-Tube about P38 "Death-Wobble" as the Americans like to term it.
     
  6. Grrrrrr

    Grrrrrr Well-Known Member

    Joined:
    Jul 8, 2012
    Posts:
    9,608
    Likes Received:
    1,552
    Location:
    Buckinghamshire, UK. ('95 DT)
    Front tyres 28 psi, rears 38 psi. Are the wheels still round after off-roading?

    UJs are definitely where the suspicion would be. There was a big argument on here a while back about the "phasing" of the prop-shafts and I've got a feeling that Britpart were different to the GNK originals. I put a video up in a thread somewhere about testing the UJs. They're on Youtube.

    Another thing to check would be the VCU, especially if you have scrubbing on the outside of the front tyres. Lifting a front wheel, transmission neutral, you should be able to tease the 32mm hub-nut to turn the wheel with about 70 nm of force. If it is taking 140 nm then it is probably worth swapping it for a refurbed one.

    Then there's radius arm bushes, drag link, track-rod ends and swivel-hub joints.
     
  7. Ginger Tom

    Ginger Tom Member

    Joined:
    Nov 19, 2018
    Posts:
    16
    Likes Received:
    4
    Location:
    Bedfordshire
    Saint, Datatek and DanClarke

    I'm running 255/55 19 Nankang's. Not sure on they tyre pressures and I would doubt there were any missing weights as the tyres were only fitted yesterday morning but as I said it has helped lessen the wobble and it doesn't happen between 56-60mph.

    Grrrrrr,

    Phasing on uj's is a problem, when I used to work on trucks you only had to be one spline out on the slider and it would cause a massive wobble. I don't suspect the VCU as the tyres that came off were very evenly worn which surprised me, was hoping that could point me in a direction.

    Tomcat59alan,

    It's not through the steering, it's felt through my seat, kept it clean, if it was through the steering I would suspect the wheels being out of balance or a buckled wheel, though I've not checked all the wheels for roundness the one that took the impact to blow out had no dents or was out of round.

    I will get the other half to shake the steering for me to check the ball joints and see if there is any play in those.

    Not sure the missus is going to like me spending more money on, what is effectively, mine and my son's toy, I'm sure she will get over it by some time next year.

    I will try the tyre pressures that have been suggested and repot back on my findings with the ball joints.

    Thanks for the replies

    Tom
     
  8. wammers

    wammers STILL BREATHING. Donater

    Joined:
    Oct 19, 2008
    Posts:
    52,170
    Likes Received:
    7,424
    Location:
    Preston Lancs.
    If you are running L322 19s, tyres should be 255/50/19 have you got spigot rings fitted?
     
    Grrrrrr likes this.
  9. Ginger Tom

    Ginger Tom Member

    Joined:
    Nov 19, 2018
    Posts:
    16
    Likes Received:
    4
    Location:
    Bedfordshire
    Bollocks, I just copied the sizes which where on the side of the tyre, I have probably f@£#ed up there then. I believe they are RRS 19's, as per pic below and I don't know about the spigots, I can't remember seeing one when I took the wheel off to change it for the spare so they are either stuck in the wheels or non existent, I'd be inclined to go for the latter.
    [​IMG]
    Hopefully that pic has worked.

    I will try to check tonight when I get home from work.

    Cheers

    Tom
     
  10. wammers

    wammers STILL BREATHING. Donater

    Joined:
    Oct 19, 2008
    Posts:
    52,170
    Likes Received:
    7,424
    Location:
    Preston Lancs.
    P38 wheels are located for rotation by the conical wheels nuts. L322 wheels are located rotation wise by the hub centre. L322 wheels have a larger bore than the P38 hub centre so you need to fit spigot rings in to make up the difference. Or the wheels will be up and down like a brides nighty. With 55 tyres your speedo will under read true speed. So don't sail close to the wind past cameras. https://www.ebay.co.uk/itm/4-METAL-...a:g:c1gAAOSwtxlb7rcy:rk:1:pf:1&frcectupt=true
     
    RangeRoller dt and Grrrrrr like this.
  11. Ginger Tom

    Ginger Tom Member

    Joined:
    Nov 19, 2018
    Posts:
    16
    Likes Received:
    4
    Location:
    Bedfordshire
    Cheers wammers, the have been added to my basket.
    Will check and purchase if required.
     
  12. kermit_rr

    kermit_rr Active Member

    Joined:
    Dec 9, 2018
    Posts:
    217
    Likes Received:
    57
    Location:
    North Shropshire
    My p38 came with 255/55/19 tyres on. Waiting for them to wear down then I'll put something a bit better on. As for the Speedo, it seems to be spot on, compared with gps on the sat nav
     
    Ginger Tom likes this.
  13. tomcat59alan

    tomcat59alan Well-Known Member

    Joined:
    Apr 3, 2011
    Posts:
    10,182
    Likes Received:
    1,828
    Location:
    wirral and triquivijate
    From your post about green landing, I assume you cleaned all the mud off your wheels,including the inside, lumps of mud will cause wheel imbalance
     
  14. marjon

    marjon Well-Known Member

    Joined:
    Jul 15, 2018
    Posts:
    797
    Likes Received:
    589
    Location:
    Bulgaria
    Had to edit mine cos ^^^^^ got there first:) +1^^

    J
     
  15. Ginger Tom

    Ginger Tom Member

    Joined:
    Nov 19, 2018
    Posts:
    16
    Likes Received:
    4
    Location:
    Bedfordshire
    Indeed I have, she had a bath a couple of days after.
     
  16. pwood999

    pwood999 Well-Known Member

    Joined:
    Nov 6, 2006
    Posts:
    754
    Likes Received:
    160
    Location:
    Near Heathrow.
    Also get the balancing checked by a different tyre fitter. I've had "low cost" Asian tyres on other vehicles in past that had balancing issues. The sticky weights used on most alloys could not fix it, so eventually my fitter used old fashioned clip weights on the rim edges which worked. Also, double check rears if the steering isn't wobbling but seat is.
     
  17. Grrrrrr

    Grrrrrr Well-Known Member

    Joined:
    Jul 8, 2012
    Posts:
    9,608
    Likes Received:
    1,552
    Location:
    Buckinghamshire, UK. ('95 DT)
    Found the thread: https://www.landyzone.co.uk/land-rover/front-propshaft-phase-offset.230945/

    Front propshaft has an offset of about 15 degrees on the originals. Britpart are in line. I remember staring at it with MrGorsky and we had 3 P38s on the drive at the time. Having looked under all of them the Britpart one went back in the box with a note saying "no thanks!".
     
  18. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    30,717
    Likes Received:
    867
    Location:
    Near Poitiers SW France
    Sorry Tony, but the LR alloy 16" or 18" wheels are not located by conical nuts, the mating surface is flat and the nut shank is not a particularly close fit in the wheel. The centre hole on the other hand is a very close fit on the hub stub.
    There is a certainly a conical end on the nut but it mates with nothing unless you fit the steel spare sometimes provided.
     
  19. Fergie46

    Fergie46 Active Member

    Joined:
    May 7, 2014
    Posts:
    366
    Likes Received:
    85
    Location:
    Dorset
    The first thing I'd do is find an MOT station that has a good rep and put the vehicle in - they'll soon find any slop in the myriad of joints, bushes etc that compose the suspension/steering malarkey.
    It's worth the money than trying to do it yourself on your back - wife talking to you through pursed lips in an unamused kind of way as you ask for assistance.:(
    And of course as an added bonus, the tester will pick up on other possible rectification work required - or it might simply pass which means beer o'clock.:)
     
  20. ukadamwest

    ukadamwest Well-Known Member

    Joined:
    Feb 28, 2012
    Posts:
    2,390
    Likes Received:
    481
    Location:
    Surrey
    i'm running 19's on mine. (with spigot rings of course)

    drop the pressure 28psi Front and Rear. I have and get even wear across the faces on all 4.

    nankangs ?

    when I got my Cayenne there were budget tyres on it and the wheel vibrated like buggery. a set on new Uniroyal Rainsport 3 all round and you could build a house of cards inside at 90 now. I like the rainsport 3 so much that's what I put on the P38 all round as the Pirelli Scorpions only come in runflat now.
     
< Previous Thread | Next Thread >