MK17 servicing question

[bada3003]

I'm using a 6mm hex wrench to unscrew (counter-clock wise) the DIN knob retainer but it's stuck and won't budge. Any preferred methods I should be trying?

 

[ams511]

From the manual:

for the DIN version: Remove with the O-ring extractor the "tank" O-ring, then with the 4 mm allen key unscrew the filter retainer. Remove the spring and the filter. Firmly hold the field handle tool and use the 6 mm socket extension to unscrew with care the DIN knob retainer. Put aside the O-ring ( P/N 01.050.138 ) for inspection.

 

[bada3003]

The "Firmly ... unscrew ... retainer" part is not working; the DIN knob retainer won't unscrew. Normally would use WD-40 on stuck screws to penetrate/loosen but trying not to on regs if possible. Been soaking in warm soapy water a few hours but still don't budge. Not sure if service tech previously over-torqued or what (not been used/service for a couple of years).

From the manual:

for the DIN version: Remove with the O-ring extractor the "tank" O-ring, then with the 4 mm allen key unscrew the filter retainer. Remove the spring and the filter. Firmly hold the field handle tool and use the 6 mm socket extension to unscrew with care the DIN knob retainer. Put aside the O-ring ( P/N 01.050.138 ) for inspection.

 

[redacted]

You need to get the reg body hot and the din retainer cold to allow solvent (water) to enter the threads and dissolve any deposits. That same hot/cold treatment reduces thread contact so it should loosen easier even if it is just over torqued. If it does not work today, soak it some more and try again tomorrow. Repeat until loose.

 

[bada3003]

You need to get the reg body hot and the din retainer cold to allow solvent (water) to enter the threads and dissolve any deposits. That same hot/cold treatment reduces thread contact so it should loosen easier even if it is just over torqued. If it does not work today, soak it some more and try again tomorrow. Repeat until loose.

Thanks. Repeated soaking in hot water did the trick. Couldn't figure out how to selectively cool just the DIN retainer.

 

[ams511]

Thanks. Repeated soaking in hot water did the trick. Couldn't figure out how to selectively cool just the DIN retainer.

The only way you cold do it is to put the entire regulator in the freezer and then after it is cold submerge the body in hot water. The body will heat and expand. If your not running high O2 concentrations you may want to lightly lubricate the threads so it does not happen again.

Edit: AWAP's way is probably easier.

 

[redacted]

Thanks. Repeated soaking in hot water did the trick. Couldn't figure out how to selectively cool just the DIN retainer.

I hold the hot body with a gloved hand and submerge the Din wheel and retainer in ice water. But more than one way to skin that cat.

 

[ams511]

I hold the hot body with a gloved hand and submerge the Din wheel and retainer in ice water. But more than one way to skin that cat.

How hot of water do you use that you need to use a glove?

 

[redacted]

How hot of water do you use that you need to use a glove?

I usually start with hot out of the tap, about 135. I have no problem going to the boiling pot if necessary.

 

[halocline]

Mmmm....boiled regulators, with mustard.