Generac Power Systems GTH1000, Service Manual

Page: 66 / 74

13-4
SECTION 13: ENGINE ASSEMBLY
Figure 13-12. Torque Flywheel Nut
ADJUST IGNITION COIL AIR GAP
1. Rotate flywheel until magnet is under coil laminations.
2. Place 0.20-.30mm (.008"-.012") thickness, non-magnetic gauge
between magnet and coil laminations, Figure 13-13.
Figure 13-13. Adjust Coil Air Gap
3. Loosen mounting screw so magnet will pull coil down against
thickness gauge.
a. Torque screws to 4.75 Nm (40 in. lbs.).
4. Rotate flywheel to remove thickness gauge.
5. Repeat Steps 1 through 4 for second coil.
INSTALL CYLINDER HEADS
1. Install cylinder head with new gasket.
2. Lubricate threads of head bolts with one drop of oil.
a. Torque head bolts in sequence shown (Figure 13-14) to 29.9 Nm
(22 ft. lbs.).
3. Insert push rods into recess in tappets.
A-B-C-D-E-F
CYLINDER HEAD TORQUE SEQUENCE:






Figure 13-14. Cylinder Head Torque
INSTALL ROCKER ARMS
1. Lubricate rocker arms and ball studs with clean engine oil.
2. Assemble ball studs, rocker arms, jam nuts and guide plates (with
tabs facing up) to cylinder head, Figure 13-15.
a. Make sure that the push rods are in the proper location on the
tappets and the rocker arms.
STUD
ROCKER ARM
NUT
GUIDE PLATE
(WITH TABS FACING UP)
Figure 13-15. Install Rocker Arms