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Thread: Occasional severe vibration from eas compressor

  1. #1
    Join Date
    May 2013
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    Cherrybrook, NSW
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    Occasional severe vibration from eas compressor

    Finally got my p38 muddy yesterday for the first time, but on the way there and at random intervals during the afternoon the eas compressor started vibrating far, far worse than normal. There's the normal operation which it'll usually do then there's this random situation when it tries to launch out of the engine bay.

    A couple of weeks back I fitted a new Teflon seal, cylinder, o-ring for the compressor taking care to follow the directions exactly and it's only started doing it since then - maybe once or twice before yesterday.

    I have an o-ring set for the valve block (thanks Paul) and replaced the 6mm and 8mm o-rings on the outside as I had some bad leaks, but am yet to fit the full kit. I'm wondering if there's something wrong in there which is only an issue now the pump is pushing decent pressure (gauge connected to line 6 shows it gets up to 145psi)... Or is this something else?

    Just wondering if anyone has seen this before? I'm not over concerned yet as I'll do the valve block seals in the next week or 2 but thought I'd ask.

    Thanks,
    Damien.

  2. #2
    Join Date
    Feb 2013
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    Gosford, NSW, Australia
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    Hi,

    I would suspect something in your rebuilt compressor is lose or misaligned, I can't even hear mine running over the engine noise.

    Steve

  3. #3
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    Thanks, I'll pull it apart and have another look but 90% of the time it runs nice & quiet... very odd.

  4. #4
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    Can you physically see the compressor "vibrating" or are you going by the noise it makes? Does it sound like a body panel is vibrating? If it started after you refitted the compressor, is it possible that you somehow "shorted" the isolation mounts?

    Is any part of the compressor close to touching something in the engine bay?

    What size washers are you using - you didn't go bigger by any chance? The securing bolt should only be secured to the metal sleeve that's cast in the rubber mount. There should not be a washer anywhere near the metal bracket - if a washer touches part of the compressor, vibration will be tranmitted to the body panel through the washer and will sound horrible

    Also check that the rubber mounts are not damaged, and that the three bolts holding the compressor are not misaligned.

    HTH

    Bojan

  5. #5
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    Jan 2012
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    My first classic that had eas had a really loud compressor that would make the cabin boom when it ran, I could feel the vibration in the wheel as I was driving. It turned out to be a missaligned piston ring collar was eating out the side of the bore. Just another possibility.

  6. #6
    Join Date
    May 2013
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    Cherrybrook, NSW
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    Quote Originally Posted by Offender90 View Post
    Can you physically see the compressor "vibrating" or are you going by the noise it makes? Does it sound like a body panel is vibrating? If it started after you refitted the compressor, is it possible that you somehow "shorted" the isolation mounts?

    Is any part of the compressor close to touching something in the engine bay?

    What size washers are you using - you didn't go bigger by any chance? The securing bolt should only be secured to the metal sleeve that's cast in the rubber mount. There should not be a washer anywhere near the metal bracket - if a washer touches part of the compressor, vibration will be tranmitted to the body panel through the washer and will sound horrible

    Also check that the rubber mounts are not damaged, and that the three bolts holding the compressor are not misaligned.

    HTH

    Bojan
    I've seen it in action and the compressor was shaking quite violently and then settled down into it's normal operation. I can only hear it because the lid of the box over the compressor vibrates very loudly so all the isolating rubbers are fine.

    Benji, thanks for your input too - I'll report back once I've opened it up to check it out.

    Damien.

  7. #7
    Join Date
    May 2013
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    I spent a bit more time on this today and let the car idle as the pressure built up. After about 110psi it starts to get louder and by 140psi it's shaking violently. I think the motor is struggling now that the piston seal has been replaced. It's
    probably seen better days as I suspect it was constantly running before I gave it an overhaul.

    I may just have to stump up and buy a new compressor - any recommendations where to get one?

    Damien.

  8. #8
    Join Date
    May 2008
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    Canberra
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    for a new compressor, check the UK P38 spare parts shops. Dont know what they are going for now, at least $500 I would guess.

    It could be a fairly simple repair on yours though.
    You can buy piston and sleeve/cylinder kits, rubber mounts, and bushes online.

    Really comes down to what is the more cost effective and convenient solution to you.
    My toys, projects and write-ups at PaulP38a.com

  9. #9
    Join Date
    Feb 2010
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    Townsville, QLD
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    Dunlop EAS compressor from island 4x4 are £150 + delivery (wouldn't imagine it'd cost that much).

    Air Suspension Compressor New ANR3731 SLP Island 4x4 - Specialists in Land Rover and Range Rover Parts and accessories for all models. UK and worldwide mail order.

    Cheers
    Keithy

  10. #10
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    May also pay to ensure that bolts which go through isolation mounts are securely bedded into EAS enclosure ( they have been known to come adrift )

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