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16th February 2026, 07:42 PM
#1
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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18th February 2026, 08:25 PM
#2
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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18th February 2026, 08:55 PM
#3
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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