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REMOVAL - TM-5-4210-224-14-P0499
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TM-5-4210-224-14-P 250 6PM Mini-Pumper Firefighting Truck Model No.:CM-KFT-3 Manual
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CYLINDER HEAD MAINTENANCE.
TMS-4210-224-14&P
6-7.
VALVE, STEM SEALS, AND SPRING MAINTENANCE. (Continued)
WARNING
Compressed air used for cleaning or
drying can create airborne particles that
may enter the eyes. Pressure shall not
exceed 30 psi (206 kPa).  Wearing of
goggles is required to avoid injury to
personnel.
REMOVAL
a. Rotate the engine until the piston is at top dead
center for each cylinder, or install air line
adapter to glow plug port and apply compressed
b. Check valve stems for excessive wear or
air to hold the valves in place.
damage. Replace if necessary.
b. Install valve spring compressor and compress
c. Check valve spring for damage or excessive
the valve spring until valve keys are accessible.
wear. Replace if necessary.
c. Remove valve keys, valve cap, or rotator, valve
d. Check the valve stem seals for damage and
springs and seals. If valve spring does not
wear. Replace if necessary.
compress, tap tool with a mallet to break bind at
rotator and keys.
INSTALLATION
a. Install new valve seal(s).
INSPECTION
b. Install valve spring with damper, shield, cap,
and rotator.
a. Check valve heads for pitting, warpage, burning,
cracked faces, excessive wear or other damage.
WARNING
Reface or replace as necessary.
Compressed air used for cleaning or
NOTE
drying can create airborne particles that
may enter the eyes. Pressure shall not
Check valve heads that have been
exceed 30 psi (206 kPa).  Wearing of
refaced. If the edge of the valve head
goggles is required to avoid injury to
is less than 1/32 inch (0.8mm) thick
personnel.
after grinding, replace the valve.
6-8

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