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Thread: P38 compressor blue line to valve block

  1. 16th February 2026, 07:42 PM #1
    Hobbes
    Hobbes is offline Master Supporter
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    P38 compressor blue line to valve block

    I’m replacing the 25yr old, rebuilt twice, compressor. Bearings, bushes, mounts all past their best.
    ive gone with the MaxSpeedingRods replacement, which is less than half the price of a Dunlop, & to be honest is a well made bit of kit.

    The current Dunlop has at the compressor end has a taper thread union. The MSR has a more sophisticated double o ring, and that seems to be the same as the currently shipping Dunlops.

    Neither kit ships with the nut & olive that connects to the 90 elbow on the valve block.

    Question is, what is the thread & union, needed BSP etc & type of olive? To secure the 6mm pipe at that end. They’ll probably need replacement

    Unfortunately, the car is a Balmain apartment resident, street parking & my only wheels so any maintenance needs planning & not a bus to the nearest Pirtek out west!

    thanks!


    Normally, I just disconnect the blue pressure outlet pipe at the compressor end
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  2. 18th February 2026, 08:25 PM #2
    prelude
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    Being a metric guy myself I can try and check it out. Mine is out (and I have a spare) AND I am in the shed today so I'll see if I can figure it out for you

    -P
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  3. 18th February 2026, 08:55 PM #3
    Hobbes
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    Thanks Prelude,
    That would be really helpful.
    A 10mm spanner fits the unions. Due to the space constraints a 72 point ring ratchet is needed to undo the valve block union I reckon & then slide it off the compressor end & its then pretty easy.
    Trying to avoid the weekend scenario of dismantled bits with no replacement olive & nuts to hand if needed!

    ta
    Hobbes
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  4. 28th February 2026, 08:57 PM #4
    prelude
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    sorry for the delay Access to the site was down for me for a while...

    I managed to find my pump in the disorganized mess that is my shed (just moved everything in end last year) and I must admit I seem to have misplaced the elbow I will be going through all the boxes and cups with the P38 stuff next week and I'll keep you posted. With the elbow it is a 10mm straight pieace of thread that sticks out on my unit. I do not know the thread pitch since I do not have a measuring device for it but it is quit a fine thread. Will pick this back up next week!

    Cheers,
    -P
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  5. 4th March 2026, 08:12 PM #5
    Hobbes
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    Thanks for that. I bought a metric/bsp thread gauge this weekend so weather permitting I’ll pull it this weekend & report back.

    thanks!
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  6. 4th March 2026, 09:19 PM #6
    prelude
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    Yes, a gauge is on my wish list as of recently as well

    I managed to find the elbow and it is a straight 10mm fine threaded type on one end (where the clamp for the pipe screws into) and it is tapered on the valve regulator block end. (same thread). It requires a 11mm spanner. The compressor end is the same thread as far as I can tell and is straight (as in no angles) and also straight (as in not tapered). I guess that is fairly standard stuff for pneumatics.

    Whilst I did try, I could not get met calipers in the very small threads to measure the pitch.

    Cheers,
    -P
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