M-08-IS-0C7
Revision 3
NCR 11983
1 of 3
C7 SERVICE ADVICE
The C7 valve is manufactured from quality materials and has been engineered to ensure a long life
in arduous Marine environments. In the unlikely event that you experience problems with this
product you may find the following notes helpful.
If the problem is Leakage read section 1, if it is Breakage read section 2.
Section 1 - LEAKAGE
First identify where the leak is coming from- see diagram below.
(a) Leakage from the Core Assembly.
This problem can be temporarily overcome by fitting the cap, as this is a secondary seal. To
permanently fix the problem, carry out the following operations: -
(i) With the buoyancy tube deflated and the valve in the closed position, remove the Cap, then
fill the valve with some warm soapy water. Open the valve by pushing the Spindle down and
turning anti-clockwise. Allow the water to drain through. Rinse through with plain water. Re-
check the valve for air tightness.
(ii) If leakage persists, use service tool C16605 with the buoyancy deflated and unscrew the
core of the valve by turning it anti-clockwise. Remove the core, noting the position of the
washer and its colour. If it is grey we would recommend that you discard it and fit the
improved black version. It is not necessary to fit the thin sealing gasket with this washer.
Apart from the colour, the improved washer can also be identified by the two thin circular
ridges on one side and four larger ridges on the reverse. Check the Rubber seal on the
valve core for dirt or damage. Check that the sealing face on the plastic core is clean and
undamaged. If the seal or core are damaged the core assembly must be replaced.
(iii) Refit the valve ensuring that the washer is replaced in the correct orientation (see picture
below for orientation) and tighten as tightly as you can using hand pressure on the tool.
Inflate the buoyancy tube and check for air tightness. We recommend that after around 24
hours the valve should be retightened to ensure it has fully seated. If leakage persists
contact your local repair shop.
CORE
NUT
CORE SEAL
SPINDLE
HOUSING ASSEMBLY
ASSEMBLY
FABRIC
CAP
STRAP
CAP SEAL
CAP
SPRING
WASHER
POSSIBLE
LEAK PATHS
PAST
WASHER
POSSIBLE
CORE LEAK
