Generac Power Systems GN190H, Service And Repair Manual

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7. Replace the spark plug. Use a Champion RC12YC (or
equivalent) spark plug.
a. Set spark plug gap to 0.030 inch (0.76mm).
b. Install new plug, tighten to 13 ft-lbs (156 in-lbs).
c. If torque wrench is not available, tighten plug with fin-
gers. Then, tighten NEW plug 1/2 turn further; or USED
plug 1/4 turn further.
8. Check that ignition wires are free of breaks and abrasions
and are properly routed.
9. Install the blower housing.
10. Run engine and adjust engine speed.
11
SECTION 1: GENERAL
1 Control Rod Assembly 1
2 Piston Pin 1
3 Piston Ring Set 1
4 Gear Cover Assembly 1
5 M8 x 52mm Head Bolt 5
6 Piston 1
7 Pin Retainer Ring 2
8 Crankshaft Assm. 1
9 Governor “R” Pin 1
10 Gov. Arm Thrust Washer 1
11 Crankcase Assembly. 1
11B Crankcase Assembly. 1
12 Governor Arm 1
13 Oil Seal 2
14 Governor Gear Assembly 1
15 Governor Gear C-Ring 1
16 Governor Spool 1
17 1/8” NPT Pipe Plug 1
18 Camshaft Assembly 1
19 Crankcase Gasket 1
20 Valve Stem Seal 1
21 Cylinder Head Gasket 1
22 Oil Pressure Relief Cover 1
23 Oil Pressure Spring 1
24 11/32” Ball 1
25 M5 Form Screw 1
26 M6-1.0 x 12mm Screw 4
27 Gov. Gear Thrust Washer 1
28 M8-1.25 x 35mm Screw 6
29 Spring Washer 1
30 Valve Spring Retainer 2
31 Valve Spring 2
32 Valve Spring Wear Washer 2
33 Geroter Set 1
34 “O” Ring 1
36 Cylinder Head Assembly 1
37 Exhaust Valve 1
38 Intake Valve 1
39 Push Rod 2
40 Tappet 2
41 Oil Pick-up Assembly 1
42 Rocker Cover Gasket 1
43 Pivot Ball Stud 2
44 GN-190/220 Rocker Arm 2
45 Rocker Arm Jam Nut 2
46 Push Rod Guide Plate 1
47 1/4” NPT Pipe Plug 2
48 Rocker Cover Assembly 1
49 Plastic Oil Fill Plug 1
ITEM DESCRIPTION QTY ITEM DESCRIPTION QTY
Figure 1.4 — Exploded View — Typical Horizontal Shaft Long Block