Generac Power Systems GTH760 Service Manual page 35

Figure 5-15. Compress valve spring and install keepers
6. Repeat procedure for other valve(s).
7. Set push rod guide plate in place with tabs facing upward, and
loosely install rocker arm assemblies (ball stud, rocker arm and
jam nut).
8. Repeat Step 7 for other head.
INSTALL CYLINDER HEAD
1. Install cylinder head with new gasket.
2. Torque head bolts in sequence shown to 29.9 Nm (22 ft.
lbs.) (Figure 5-16).
3. Insert push rods into recess in tappets.
A
C
TORQUE SEQUENCE FOR HEADS:
A-B-C-D-E-F
Figure 5-16.
1. Set No. 1 cylinder at TDC, compression stroke.
a. Adjust rocker arms and check clearance (Figure 5-17).
Valve Clearance (cold) Intake and Exhaust 0.076 mm (.003").
b. Torque jam nut to 19 Nm (168 in. lbs.).
2. Set No. 2 cylinder at TDC, compression stroke and repeat Steps
3. Install valve covers with new gaskets.
a. Torque screws to 6.8 Nm (60 in. lbs.).
Install all parts shown in Figure 5-18.
D
1. Install cylinder wrappers.
a. Torque M5 screws to 2.8 Nm (25 in. lbs).
b. Torque M6 screws to 4.5 Nm (40 in. lbs).
2. Install spark plugs.
a. Torque to 19 Nm (168 in. lbs.).
B
3. Install exhaust manifold.
a. Torque screws to 19 Nm (168 in. lbs.).
4. Install blower housing.
a. Torque screws to 4.5 Nm (40 in. lbs).
5. Install intake manifold with new gaskets.
a. Torque screws to 19 Nm (168 in. lbs.).
b. Assemble governor link to carburetor.
5-5
SECTION 5: CYLINDER HEAD AND VALVES
ADJUST VALVE CLEARANCE
Figure 5-17. Adjust Valve Clearances
1a and 1b above.
REASSEMBLE
5