TR2/3/3A Oil pressure gauge needle sticking?

[karls59tr]

Is there an easy fix...wonder what's binding? Two or three fairly hard taps on the glass relocates the needle.:distress:

 

[Gliderman8]

Is there a gasket between the gauge and the glass that has deteriorated over time?
Just my best guess.

 

[CJD]

It is easily fixed, but the gage has to come apart, which can be tedious. About mid way down this thread you can see how the oil pressure gage looks inside.

https://www.britishcarforum.com/bcf/showthread.php?94885-Instrument-Faces/page3

 

[karls59tr]

So a good clean up and lubrication should free up the needle movement correct? Is it also possible that the needle is pressing against the glass? Great articles on gauge repair.

 

[CJD]

It's a super simple gage. The little brass diaphram simply pushes against the needle. The needle has a small clock style spring to hold it against the diaphram. I am sure a bit of dirt or corrosion is allowing it to stick. It's possible the needle is hitting the glass, but not likely. There is not a positive seal on the casing. There is plenty of space for dust and dirt to make it through the light ports and get in the gage workings.