Install Cylinder Head; Adjust Valve Clearance; Reassemble - Generac Power Systems GTV-990 Manual

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.

ADJUST VALVE CLEARANCE

1. Set No. 1 cylinder at TDC, compression stroke.
a. Adjust rocker arms and check clearance (Figure 5-17).
Figure 5-17. Adjust Valve Clearances
Valve Clearance (cold) IN and EX 0.0762 mm (.003").
b. Torque jam nut and ball stud to 19 Nm (14 ft. lbs.).
2. Repeat for No. 2 cylinder.
3. Install valve covers with new gaskets, Figure 5-18.
a. Torque nuts to 6.8 Nm (5 ft. lbs.).
D
B
1. Install cylinder wrappers.
2. Install spark plugs.
3. Install exhaust manifold.
4. Install blower housing.
5. Install intake manifold with new gaskets.
5-5
SECTION 5: CYLINDER HEAD AND VALVES
Figure 5-18. Install Valve Covers

REASSEMBLE

a. Torque M5 screws to 2.8 Nm (25 in. lbs).
b. Torque M6 screws to 4.5 Nm (40 in. lbs).
a. Torque to 20 Nm (180 in. lbs.).
a. Torque screws to 19 Nm (14 ft. lbs.).
a. Torque screws to 4.5 Nm (40 in. lbs).
a. Torque screws to 19 Nm (14 ft. lbs.).
b. Assemble governor link to carburetor.
3
FINGER GUARD
1
2 ROTATING SCREE
3 INTAKE MANIFOLD
ASSEMBLY
4
4
7
8
VALVE COVER
Figure 5-19. General Assembly
6
8
7
5
2