Tennant 186, Operator'S Manual

Page: 50 / 88

MAINTENANCE
186 MM159 (6–94)
3Ć14
CYLINDER HEAD
The cylinder head may develop carbon deposits.
After every 400 hours of operation, remove the
cylinder head and clean it of any accumulated
deposits. Replace the cylinder head, making sure
the cylinder head screws are lubricated with
graphite grease and are returned to the same
hole. Alternately snug the screws; tighten them to
one-half of the specified value, then torque the
screws to 15 to 20 ft lb (20 to 25 Nm).
03076
CYLINDER HEAD SCREW TIGHTENING
SEQUENCE
VALVE TAPPET CLEARANCE
The valve tappet clearance must be inspected
after every 400 hours of operation. The intake
valve clearance should be 0.006 to 0.008 in
(0.15 to 0.20 mm) cold. The exhaust valve
clearance should be 0.017 to 0.019 in
(0.43 to 0.48 mm) cold. Grind off the end of the
valve stem to obtain the proper clearance.
PCV SYSTEM
The pcv system including the reed valve and
gaskets must be inspected after every 400 hours
of operation.
TUNE-UP CHART
Maximum governed speed 2000 rpm
Spark plug gap 0.023 to 0.028 in
(0.58 to 0.71 mm)
gasoline
0.016 to 0.020 in
(0.41 to 0.51 mm)
LPG
Valve clearances, cold 0.006 to 0.008 in
(0.15 to 0.20 mm)
intake
0.017 to 0.019 in
(0.43 to 0.48 mm)
exhaust