Tecumseh HH100, Handbook, Page: 33 / 78

31
SECTION 2. CYLINDER HEAD
CYLINDER HEAD TORQUE. For 8 H.P. and larger
engines (except valve-in-head engines), make sure
surfaces are clean, then place new head gasket on
cylinder and position head.
Slide one belleville washer (crown toward bolt head)
and one flat washer (sharp edge toward bolt head)
over each bolt as shown in illustration.
Insert the bolts in the head with the two shorter bolts
in the position shown in the illustration. The two short
bolts for positions 1 and 8 are 2'’ long (50.8 mm)
and all other bolts are 2-1/4'’ long (57.15 mm).
Tighten bolts evenly to 50 in. lbs. (5.6 Nm) torque.
Increase torque evenly by 50 in. lbs. (5.6 Nm) until
final torque of 200 in. lbs. (22.6 Nm) is attained in
the following sequence: (See Figure)
Run engine for 15 minutes, allow to cool and then
retorque the bolts in the same sequence as described
above.
CYLINDER HEAD TORQUE FOR VALVE-IN-HEAD
ENGINES.
Slide one belleville washer (crown toward bolt head)
and one flat washer (sharp edge toward bolt head)
over each bolt as shown in illustration.
Torque head bolts to 200 inch pounds (22.6 Nm) in
50 inch pound (5.6 Nm) increments. Tighten in numerical
order. Note that head bolts marked 1 and 5 are
1-3/8'’ long (34.925 mm). Other bolts are 1-3/4'’ long
(44.45 mm).
HEAD ASSEMBLY, TORQUE SPECIFICATIONS. Run
engine for 30 minutes, allow to cool until head is
cool to the touch and then retorque the bolts in the
same sequence as described. (All except number
“1” (25.4 mm) bolt which cannot be retorqued unless
the rocker arm housing is removed.)
HEAD BOLTS
TORQUE IN NUMERICAL
ORDER
BELLEVILLE WASHER
(CROWN TOWARD
BOLT HEAD)
FLAT WASHER
(SHARP EDGE
TOWARD BOLT
HEAD)
2-1/4”
(57.15 mm)
BOLTS
SPARK
PLUG
HOLE
2
7
4
5
6
1
9
8
3
2’ (50.8 mm)
BOLTS
TORQUE IN NUMERICAL ORDER
PUSH ROD TUBE
“O” RINGS
1
4
6
3
5
2
1-3/4”
(44.45 mm)
1-3/4”
(44.45 mm)
1-3/4”
(44.45 mm)
1-3/4”
(44.45 mm)
1-3/8”
(34.925 mm)
1-3/8”
(34.925 mm)
BELLEVILLE WASHER
CROWN SIDE UP
FLAT
WASHER