Generac Power Systems 004987-2 User Manual
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Section 7 — Exploded Views and Parts Lists
GT-990 Engine – Drawing No. 0G2963-G (Part 1)
ITEM PART
NO. QTY. DESCRIPTION
1
0C5729
1
ASSY, CRANKCASE WITH SLEEVE
2
0E9843A
1
SEAL, 38 I.D. CRANKSHAFT GREEN
3
0G0919
7
SCREW, HHFCS M6-1.0 X 12 G8.8
4
0C5372
1
ASSEMBLY,
BREATHER
5
0C3005
1
GASKET, BREATHER COVER
6
0E3372B
1
SEPARATOR, OIL BREATHER
7
0D8067A
1
ASSEMBLY, HEAD #1
8
071983
4
RETAINER, PISTON PIN 20
9
0G0693
1
ASSY,
ROCKER
COVER
W/BARB
10
0D4788
1
PLUG,STD PIPE 3/8” STEEL SQ HEAD
11
0G2752
2
PISTON, DISH TOP DIA 90 COATED
12
0G2565
2
RING SET, PISTON DIA 90
13
0E1466
2
PIN PISTON
14
0D4041
1
ASSEMBLY, CAMSHAFT & GEAR
15
043790A
1
BARBED ELBOW, 90 DEG. 3/8NPT X
3/8 VS
16
093064
1
ASSEMBLY, OIL FILL CAP
17
0C2977
1
GASKET, CRANK CASE
18
0C5943
1
SEAL, OIL PASSAGE
19
0E3791E
1
ASSY, GTH-990 DIRECT DRIVE
20
0E3223
2
ASSEMBLY, CONNECTING ROD GT-990
21
0D2157
2
SCREW SHC M6-1.0 X 50 G8.8
22
0E6098
1
SCREEN, OIL PICKUP
23
0D4123B
1
ASSY,OIL PUMP GTH W/O O-RING
24
0E8152
1
O-RING, 0.49 ID X 0.07 THICK
25
0C3011
2
COVER, OIL RELIEF
26
0C3009
2
SPRING, OIL RELIEF
27
0C3010
2
BALL, 1/2D OIL RELIEF
28
093873
2
WASHER, LOCK RIB M6
29
0F5458
1
SCREW, PLASTITE HI-LOW #10
30
0C5998
1
CLAMP, OIL TUBE
32
0F2664E
1
ASSEMBLY, DIPSTICK GTH-990
PORTABLE
ITEM PART
NO. QTY. DESCRIPTION
33
0D3745
1
TUBE, DIPSTICK
34
0C3027
1
O-RING, 3/8 X ½
35
0E9842A
1
SEAL, 42 I.D. CRANKSHAFT GREEN
36
0F8054
1
GEARCOVER / ADAPTOR GTH990/760
37
0C3006
10
SCREW, HHFC M10-1.5 X 55
38
080318
8
SCREW HHFC M6-1.0 X 25
39
0G1839
2
LIFT HOOK, GT990/760
40
0D2723D
1
COVER, ROCKER W/OIL FILL
“GENERAC” TEXT
41
0C2979
2
GASKET, VALVE COVER
42
086515
8
KEEPER, VALVE SPRING
43
0D2274
4
RETAINER, VALVE SPRING
44
0D3867
4
SPRING, VALVE
45
078672
2
SEAL, VALVE STEM D7
46
0C5371
4
WASHER, VALVE SPRING
47
072694
4
STUD, ROCKER ARM PIVOT
49
0D5313
4
ROCKER ARM
50
0D3998
4
NUT, HEX M8-1.0 GB YELLOW CHROM
51
0D6024
2
PLATE, PUSH ROD GUIDE
52
0C2976
12
SCREW HHFC M8-1.25 X 65
53
086516
2
VALVE, EXHAUST
54
0C2229
2
VALVE, INTAKE
55
083897
4
TAPPET, SOLID
56
0D8067B
1
ASSEMBLY, HEAD #2
57
0D9853D
4
PUSHROD 147
58
0C2978
2
GASKET, HEAD
60
0D6008
1
KIT GEAR COVER
61
0D4010
1
KIT GASKET
62
0D6007
1
KIT PISTON & RINGS
63
0D4012
1
KIT BREATHER ASSEMBLY
64
0D8675A
1
KIT HEAD ASSEMBLY CYLINDER 1
65
0D8675B
1
KIT HEAD ASSEMBLY CYLINDER 2
66
0D4015
1
KIT OIL RELIEF