Table 4-1. Organizational Preventive Maintenance Checks and Services - Continued
S - Semi-Annually
M - Monthly
M Q s
ITEM TO BE INSPECTED
ENGINE ASSEMBLY - Continued
Inspect cylinder head, muffler and muffler
Cylinder Head and Muffler
bracket for leeks, cracks, breaks and loose bolts.
Tighten any loose cylinder head bolts and muffler
bolts. Replace defective cylinder head gasket,
muffler gasket, muffler or any missing hardware.
PMCS interval is Quarterly or after every 250-300
hours of operation.
Remove spark plug wire, spark plug and head bolts
(1). Remove head (2) and shield (3). Clean head
with a bristle brush (not wire). Inspect gasket (4).
Dry cleaning solvent P-D-680 (safety or Stoddard's
Solvent) is potentially dangerous. Avoid repeated
and prolonged breathing of vapors and skin contact
with the liquid. Do not use near open flame, arcing
equipment or other ignition sources. Always wear
eye protection and protective clothing. The flash
point of P-D-680 is 100 to 138F (30 to 59C).
If necessary, clean engine parts using cleaning solvent
Install new gasket.
Replace head bolts and tighten to recommended torque