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P38A Diesel Auxillary Belt Tensioner

Discussion in 'Range Rover' started by Lukas018, Jun 5, 2020.

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  1. Lukas018

    Lukas018 Active Member

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    Evening All,

    I noticed when my engine was running the tensioner and arm were rocking up and down, more than I like, looks like there is too much movement between FIP cap and the arm, see photo.

    I torqued the cap to RAVE if go any further will crack it like I did the last one.

    Is there a washer or something that holds the arm in tighter or is the tensioner worn as I renewed it about a year ago?

    Thanks,
     

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  2. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    It does move/pivot on the axis.
    tensioner shouldn’t be duff after a year? Cap shouldn’t be too tight, something may be jamming causing it to catch - I’d take belt off (careful with the fulcrum) and feel all the spinny bits like idlers/pulleys/pump see they are turning smoothly
     
  3. Lukas018

    Lukas018 Active Member

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    @RangeRoller dt thanks mate must be me will check it again.

    On another note the blowers when on full blast probably only got about 70% power on full blast it went full blast for a second and cut down in power. The HEVAC is new seems like where they not run for a while or is it them bloody white connectors in drivers footwell? I need to cut them out and wire them direct.
     
  4. Datatek

    Datatek Well-Known Member

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    Fan speed is reduced when the coolant is cold.
     
  5. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    Another thing worth mentioning, which has different views, is wether the tensioner should have oil in it like a ram. I’ve seen ones that say ‘keep this way up’ On them and mine had oil in it (but everything did after going upside down).
    I 3/4 filled mine with 10w40 I had for the engine when I stripped it all
     
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  6. Datatek

    Datatek Well-Known Member

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    I think they are like a spring loaded damper
     
  7. Lukas018

    Lukas018 Active Member

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    This was when the engine was warm mid-way on gauge left running for 20mins so I can do last stage of head bolt tightening. Air temp was ok. Think while car just needs good run.
     
  8. Lukas018

    Lukas018 Active Member

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    My one had that 'this way up'. From what your saying shall I remove it and check oil in it?
     
  9. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    I decided oil wouldn’t hurt anything but no oil would if required.
    I’d definitely take it off and check it shouldn’t be bouncing about and you may be covered for replacement (spare) if it fails before it’s time
     
  10. Lukas018

    Lukas018 Active Member

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    Ok mate I will have a proper look and belt came loose a couple of times before thinking about it so gota go back through when I bought it.
     
  11. brianp38dse

    brianp38dse Well-Known Member

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    The arms are known to crack and can cause the belt to come off.
     
  12. Lukas018

    Lukas018 Active Member

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    I renewed that as my old one snapped when I changed the belt.
     
  13. brianp38dse

    brianp38dse Well-Known Member

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    Ok that rules that out then:D
     
  14. Kev12

    Kev12 Well-Known Member

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    I had a similar problem and it was the little bushes on the ends of the tensioner were very worn. Well I dont know how old the tensioner was either so it probably had little dampening effect left in it. It was so bad that occasionally at start up the tensioner would pivot over centre and stay released.
     
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  15. Kev12

    Kev12 Well-Known Member

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    RangeRoller dt and Lukas018 like this.
  16. Lukas018

    Lukas018 Active Member

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    :p:D will take it off at some point think tensioner has had it
     
  17. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    I remember that :D
    is worst I’ve seen.
     
  18. wammers

    wammers STILL BREATHING. Donater

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    The belt tensioner does tend to appear bounce a little as it takes up the run out on the crank vibration damper. Or as the belt is loaded and unloaded. That is quite normal. What is not normal is if it moves to excess, then you need to be looking at the state of the crank damper. Plus your engine will not be cooled properly with a missing fan shroud.
     
  19. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    +1 I tried few unorthodox methods to increase cooling, (removing acoustic shielding to help hotstart was the one that made Wammers chuckle) removing the fan shroud had a negative effect. Just kicks the air about instead of pulling it through. Some have little flaps on the sides too

    That reminds me - I never got round to drilling holes in the grille :eek::)
     
  20. Lukas018

    Lukas018 Active Member

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    Ok movement is not excessive.

    Fan shroud yes it is important but my one has cracked and degraded so ordered a new one. Car not being driven as needs mot and track rod end.

    How would you diagnose faulty damper apart from excess movement on the belt?
     
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