Tennant 1550, Manual

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MAINTENANCE
1550 Gas/LPG/Diesel MM283 (8--02)
3--32
CYLINDER HEAD -- GASOLINE, LPG
CYLINDER HEAD BOLT TIGHTENING
CONTINENTAL ENGINES
(For machines below serial number 001424)
A three-stage torque procedure should be used
when reassembling the cylinder head. The
cylinder head cap screws and risers must be
tightened in the proper sequence after the first 50
hours of operation and after every 400 hours of
operation.
Snug down cap screws and risers in the proper
sequence. Tighten the cap screws and risers to
one-half of the specified value.
TM27 engines: Hand torque cold M10 bolts to 50
to 55 ft lb (68 to 75 Nm) and M12 bolts to 80 to 85
ft lb (108 to 115 Nm) in the correct order.
01472
TM27 CYLINDER HEAD BOLT TIGHTENING
SEQUENCE -- CONTINENTAL ENGINES (For
machines below serial number 001424)
The cylinder head cap screws and risers must be
re-torqued after the engine is put into operation
and brought up to proper operating temperatures.
To re-torque cap screws, follow the correct
sequence. Loosen one head cap screw or riser at
a time one quarter turn (90 degrees); then
re-torque it to the correct value.
NOTE: Power wrench torque limit must be held at
least 10 ft lb (14 Nm) below hand torque
specification; then hand torque to the
specifications.
VALVE TAPPET CLEARANCE
The valve tappet clearance must be checked after
the first 50 hours of operation and after every
400 hours of operation.
TM27 engines: Check and adjust the intake
tappets to 0.014 in (0.36 mm) clearance and the
exhaust valve tappets to 0.018 in (0.46 mm)
clearance when the engine is warm and is
operating at idle speed.
CYLINDER HEAD BOLT TIGHTENING --
GM ENGINES (For machines serial number
001424 and above)
A two-stage torque procedure should be used
when reassembling the cylinder head. The
cylinder head cap screws and must be tightened
in the proper sequence after the first 50 hours of
operation and after every 400 hours of operation.
Install the cylinder head bolts finger tight.
Hand torque the cylindrical head bolts to 90 ft lb
(122 Nm) in the correct order.
10
6
2 3 7
9 5
1 4 8
CYLINDER HEAD BOLT TIGHTENING
SEQUENCE -- GM ENGINES (For machines
serial number 001424 and above)
The cylinder head bolts must be re-torqued after
the engine is put into operation and brought up to
proper operating temperatures. To re-torque cap
screws, follow the correct sequence. Loosen one
head cap screw or riser at a time one quarter turn
(90 degrees); then re-torque it to the correct
value. Check the valve tappet clearance.
NOTE: Power wrench torque limit must be held at
least 10 ft lb (14 Nm) below hand torque
specification; then hand torque to the
specifications.