Disassemble pressure tester??

[nahuebsch82]

Maybe I've finally been had, I got a mac pt700m-6 pistol grip style coolent system tester at a pawn shop today for 45$ (they wanted 75$). Got home to try it out and it doesn't build pressure. Is there a way to Disassemble one of these that anyone lows?

 

[signcrafter]

I don't know about the mac one but I have had my stant apart. Just unscrew the ends from the tube.

 

[nahuebsch82]

I don't know about the mac one but I have had my stant apart. Just unscrew the ends from the tube.

Ok I figured, it may just be on there really tight. Anything I should look for when apart?

 

[signcrafter]

The stant has a leather cup on the plunger that makes the seal and builds pressure. This is supposed to be oiled and if not it dries out and can cause problems. I bought a used stant that wouldn't work and it had rusted threw on one of the ends. Is there a little hole on the top somewhere? If so try adding some oil and see if that helps.

 

[nahuebsch82]

The stant has a leather cup on the plunger that makes the seal and builds pressure. This is supposed to be oiled and if not it dries out and can cause problems. I bought a used stant that wouldn't work and it had rusted threw on one of the ends. Is there a little hole on the top somewhere? If so try adding some oil and see if that helps.

added some oil works perfect thanks!!

 

[signcrafter]

Glad to hear!

 

[L5wolvesf]

Reviving this thread to say thanks. My same model Mac tester had the same problem after sitting for several years. A few drops of 3-in-1 got it back working again.