Kirby 37 appendix Disassembly of the Defogger Valve, Cleaning and Lubricating

Kirby Morgan 37 & 57

7.4 Defogger Valve

7.4.1Disassembly of the Defogger Valve

Tools Required:

3/8 inch Slotted Flat Blade Screwdriver

13/16 inch Open End Attachment on Torque Wrench

The defogger valve components are disassembled as follows:

1)First, unscrew the control knob lock nut and re- move the spring, control knob, and washer.

Remove the defogger control knob.

The valve stem usually comes out with the bonnet.

The seat should be removed for inspection.

2)Next, unscrew the bonnet. Its o-ring will come off with it. The valve stem, o-ring, and washer usually come out with the bonnet and can be pushed out of the bonnet once removed from the side block.

3)If the stem remains in the side block body it can be lifted out after the bonnet is removed.

4)The seat assembly can be unscrewed from the side block body with the stem or a screwdriver.

7.4.2 Cleaning and Lubricating

1)Clean all the metal first in the soapy water solution and then in a 50/50 dilute solution of white vinegar/ water. Rinse in fresh water.

2)Check the Teflon® seat for wear and/or contamina- tion, and replace if necessary. Damage such as a rough face or cuts to the seat indicate it must be replaced.

3)The Teflon® washer and O-ring must be replaced if worn.

4)Be sure to place a light coating of silicone grease on all internal moving parts, O-rings, and washers. However, do not lubricate the Teflon® seat, as this will attract dust and debris.

5)Inspect the seat area inside the side block and replace the block if damaged.

Clean all the metal parts to remove salts.

© Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 080508001 73