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Adjusting PCL Mk3 tyre inflator

Query on how to calibrate a PCL Mk3 tyre inflator

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Rob Rimmer15/03/2019 15:00:14
80 forum posts
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Does anyone have any experience on adjusting / calibrating a PCL Mk3 tyre inflator? I've had it about thirty years, and always regarded it as being more accurate than any other gauges I own, but recently noticed that, compared with three other gauges I tried (which all agreed to within 1 lb/sq in), it's reading about 5 too high - an indicated 40 is about 35 by the other three. The others are a very old Dunlop slidey piston type, a dial gauge I picked up in the USA, and a cheapish digital one. If they all disagreed, I'd still believe the PCL, but they don't.

I know you can't really rely on anything to stay calibrated too long, but is there an easily accessible adjustment screw or something that I could tweak to get it a bit closer to my perceived reality?



Rob Rimmer19/03/2019 09:40:47
80 forum posts
1 photos

Just to close this thread off, and in case anyone needs similar information, this is the reply I received from PCL:-

"Sorry the MK3 cannot be adjusted or recalibrated.

The gauge should be oiled, this will prevent the gauge from sticking, which can give incorrect readings.

It should be oiled a few times a month depending on usage. The oil screw is located above the serial number."

Well, mine has never been oiled since I bought it, so hopefully this will help.


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