Tennant 1550, Manual

Page: 79 / 628

MAINTENANCE
3--33
1550 Gas/LPG/Diesel MM283 (2--05)
CYLINDER HEAD -- DIESEL
CYLINDER HEAD BOLT TIGHTENING
CONTINENTAL ENGINES
(For machines below serial number 001424)
The proper sequence and torque values should
be used when reassembling the cylinder head.
The cylinder head bolts must be tightened in the
proper sequence after the first 50 hours of
operation and after every 400 hours of operation.
Hand torque cold M10 bolts to 50 to 55 ft lb
(70 to 75 Nm) and M12 bolts to 90 to 95 ft lb (120
to 130 Nm) in the correct order.
01472
CYLINDER HEAD BOLT TIGHTENING
SEQUENCE
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. Check the valve
tappet clearance.
NOTE: Power wrench torque limit must be held at
least 10 ft lb (15 Nm) below hand torque
specification; then hand torque to the
specifications.
CYLINDER HEAD BOLT TIGHTENING
PERKINS ENGINES
(For machines serial number 001424 -- 001505)
The proper sequence and torque values should
be used when reassembling the cylinder head.
The cylinder head bolts must be tightened in the
proper sequence after the first 50 hours of
operation and after every 400 hours of operation.
Gradually and evenly tighten the setscrews to 52
ft lb (70 Nm) in the correct order.
CYLINDER HEAD BOLT TIGHTENING
SEQUENCE
Tighten the four additional setscrews with a 14mm
extended socket spanner. Gradually and evenly
tighten the four setscrews to 74 ft lb (100 Nm).
Repeat the procedure to ensure that all setscrews
are tightened to the correct torque.
NOTE: Power wrench torque limit must be held at
least 10 ft lb (15 Nm) below hand torque
specification; then hand torque to the
specifications.