Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
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March 2009<br />
9.9.2 2 nd Stage Cylinder Head<br />
Description:<br />
The cylinder head is made from cast iron <strong>and</strong> contains two oil free automatic photo<br />
type valve retained by valve covers having the inlet <strong>and</strong> outlets in the top.<br />
Disassembly:<br />
1. Remove the suction <strong>and</strong> delivery pipework <strong>and</strong> water manifold.<br />
2. Fit a new head gasket <strong>and</strong> refit the cylinder head. Ensure correct alignment of inlet<br />
<strong>and</strong> outlet connectors. Tighten socket screws to correct torque setting – 55ft-lbs<br />
(41Nm).<br />
3. Fit the valve assemblies in the cylinder head ensuring that they seat fully (lap in if<br />
necessary).<br />
4. Refit the valve covers, tighten nuts to correct torque setting –30ft-lbs (22Nm).<br />
5. Refit suction <strong>and</strong> delivery pipework <strong>and</strong> water manifold.<br />
9.9.3 Plate Valves (1 st Stage/2 nd Stage) Suction <strong>and</strong> Delivery<br />
Description:<br />
The valves are the automatic plate frictionless type made in stainless steel.<br />
Maintenance:<br />
Service every 1000 hours/replace valve springs <strong>and</strong> plates every 5000 hours.<br />
Disassembly:<br />
1. Clean the free end of the centre bolt.<br />
2. Locate on a simple fixture made by gripping two pins at the correct spacing in a<br />
vice to prevent rotation when loosening <strong>and</strong> tightening the nut.<br />
NOTES<br />
(1) Always hold the suction seat <strong>and</strong> discharge guard respectively while loosening or tightening<br />
the nut to prevent shearing off the locating pins on the valve.<br />
(2) Never hold the valve directly in the vice.<br />
(3) Never hammer on the wrench to loosen or tighten the nut.<br />
3. Thoroughly clean all parts using a soft brush <strong>and</strong> a suitable cleaning agent. Take<br />
particular care to clean all the parts in the seat <strong>and</strong> guard to utilise full seat area.<br />
NOTE<br />
Never use wire brushes or tools with sharp edges to clean the seats <strong>and</strong> plates.<br />
4. Check the condition of all components of wear, damage to the seating faces, valve<br />
plates <strong>and</strong> fatigue of the springs.<br />
5. Valve Plates: It is important to replace excessively worn valve plates. Maximum<br />
allowable wear is 10% of the total thickness of the plate.<br />
Chap 9 Page 111 of 168 OM002 Rev 5
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