4-16. Cylinder Head, Intake and Exhaust
Inspect the cylinder head for defective
Valves - continued.
Remove the low pressure valve covers
Inspect the valve gaskets for distortion
(2) and remove discharge and inlet
or imprints that will render them
valve components. The discharge valve
assembly (5) and the inlet valve as-
sembly (14) can be further disassem-
(6) Repair after inspection.
bled by removing screws (6) and nuts
(7). Keep discharge and inlet valve
Valves and valve seats must be flat and
can sometimes be resurfaced by
Remove the high pressure valve covers
rubbing on fine (No. 400) emery cloth
(17) and gaskets (18).
held on a smooth flat surface.
Replace all defective parts that cannot
Unscrew valve seats (22) and valve
retainers (19) and remove the valve
plates (21) and springs (20).
(5) Remove gasket (23).
When installing valves be careful not to
catch valves between edges of seats
and retainers (valves must move freely
Cleaning, Inspection and Repair.
in retainers when assembled).
WARNING : Drycleaning solvent, P-D-680,
used to clean parts is potentially dangerous
valve components are assembled in
to personnel and property. Avoid repeated
the sequence shown. The high pressure
and prolonged skin contact by wearing
inlet and discharge valves have
rubber or solvent impermeable gloves when
identical components but must be
handling the solvent or material wet with
assembled in a different sequence to
drycleaning solvent. Wash hands immedi-
ately ater exposure with soap and water
and use a lanolin based skin cream to
Install the high pressure inlet and dis-
prevent skin drying. Do not use near open
charge valve components. Torque the
flame or excessive heat. Flash point of
retainers (19) and seats (22) to 50
solvent is 100oF (38C). Ensure that venti-
lation adequate to reduce solvent vapor
concentrations below acceptable threshold
Assemble the low pressure inlet valve
limit values is provided.
assembly (14) and discharge valve
Clean all parts with cleaning solvent,
P-D-680, and dry thoroughly.
Install the valve components in the
Inspect all valve seats and valve discs
for cracks, breaks, rough or scored
Install valve covers (2) with screws (1).
install a new gasket (27) and install the
Inspect the springs for distortion, weak
cylinder head (24) on the air com-
tension or broken coils.