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RE
PAIR PARTS
SEARS
18 TWIN HYDRO GARDEN TRACTOR--MODEL NO.
9
17.257070
ONAN ENGINE--MODEL
NO. B48M-GA018/3475A
CYLINDER BLOCK GROUP
KEY
PART
DESCRIPTION
KEY
PART
DESCRIPTION
NO.
NO.
NO.
NO.
1
110-2590
Cylinder Block Assembly
21
123-1175
Reed
2
517-0048
*Plug
22
123·1173
Baffle
3
800-0051
*Cap
Screw (3/8 · 16 x 1 · 1/4")
23
123-1174
Spring
4
104-0776
*Shim
(.005" Thick)
24
110-1879
Valve Cover
5
CRANKSHAFT BEAR ING, REAR
25
110-2274
Valve Cover
101-0450
*Standard
26
11
0-1921
Gasket
101-0450-02
.002'
'
Undersize
27
VALVE TAPPET
101-0450-10
.010"
Undersize
115-0006
*Standard
1 01-0450-20
.020" Undersize
115-0006-01
.00 1" Oversize
10
1-0450·30
.030" Undersize
115-0006-02 .002" Oversize
6
104-0575
*Thrust
Washer
115-0006-05
.005"
Oversize
7
101-0415
*Gasket
28
110-1808
Intake Valve
8
101-0439
*Bearing
Plate, Rear
29
110.1809
Exhaust Valve
9
101-0405
*Camshaft
Bearing
30
800-0010
Cap Screw (1/4 · 20 x 3/4
11
)
10
509-0041
*Seal
31
11
0-0539
Valve
Spring
11
516-0072
*Drive Pin
32
110-0639
Valve Spring Lock
12
120-0735
*Tube
33
520-0820
Stud
13
VALVESEATINSERT,EXHAUST
34
800.0046
Cap Screw (3/8 · 16 x
1/2"
)
11 (}.1824
*Standard
35
526-0066
Flat
Washer, Copper
(25/64"
I.D. x
110-1824-02
.002"
Oversize
9/16" O.D.
x 1/16"
Thick)
110-1824-05
.005" Oversize
36
110-2287
Head Gasket
110-1824-10 .010" Oversize
37
CYLINDER HEAD
110-1824-25 .025
11
Oversize
110-2564
Right
Side
14
VALVE SEAT INSERT,
I
NTAKE
110-2563
Left Side
110-0197
*Standard
38
110-0904
Roto-Cap
·
ExhaustValves
"
110-0197-02
.002'' Oversize
39
526-0018
Flat
Washer (17/64
I.
D. x 5/8
110-0197-05 .005" Oversize
O.D. x 1/16"
Thick)
110-0197-10 .010" Oversize
40
526-0122
Flat Washer
11/32" I.D. x
23/32"
110-0197-25 .025"
Oversize
O.D.
x 10 Ga.)
15
CRANKSHAFT BEARING, FRONT
41
CAP
SCREW· SPECIAL
101-0432
*Standard
800-0540
5/16 · 18
X
1 ·
5/8"
1
01-0432-02
.002"
Undersize
800-0541
5/16-18x2"
101-0432-10
.010"
Undersize
42
526·0063
Flat Washer, Copper 17/64"
I. D.
x
101-0432-20 .020" Undersize
7/16"
O.D. x 1/32" Thick)
1
01-0432-30 .030" Undersize
43
110-0893
Retainers · Intake Valves
16
110.1807
*Valve
Guide
160-1213
Ignition Tune-up Kit
17
110-0068
*Gasket
168-0140
Carbon Removal Gasket Kit
18
149-1299
*Vacuum
Tube
168-0141
Engine Gasket Kit
19
850-0050
*
Lockwasher (3/8")
20
516-0141
*Alignment
Pin
*Parts Included in
Cylinder
Block Assembly
.
33-
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