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REPAIR PARTS
GT 18 TWIN GARDEN TRACTOR-MODEL NUMBER 917.255910
ENGINE_-MODEL HUMBER 422437, TYPE NUMBER 0721-01
CYLINDER, CRANKSHAFT AND ENGINE BASE GROUP
KEY PART DESCRIPTION KEY PART DESCRIPTION
NO, NO. NO NO,
I 394900
2 391086
3 212461
4 212462
5 270984
8 270983
7 393243
8 393153
9 27803
10 93394
11 270882
tl 271145
11 271148
12 93113
13 93111
t4 91084
15 394430
16 394535
17 291675
18 93847
19 394955
I9 394956
19 394957
19 394958
20 394959
20 394960
20 394961
20 394962
21 394023
22 260924
23 299691
23 391286
24 394306
25 223053
26 92909
27 390420
28 65906
29 26828
30 221596
31 292260
32 93630
33 261368
34 212337
Cylinder Assembly 35 271316
Seal- Oil 36 296004
Head- Cylinder No. t 37 394348
Head- Cylinder No. 2 38 89838
*Gasket ..Cylinder Head No 1 39 220883
*Gasket - Cylinder Head No, 2 40 394539
Breather Assembly NoD1
Breather Auembly No, 2 41 90576
*Gasket ..Valve Cover 42 231174
Screw., Scm 43 280180
°Gasket ,.CrankcaseCover t/64" Thick 44 394014
"Gasket _Crankcar_ Cover °008" Thick 45 68838
°Gasket - CrankcaseCover ,089" Thick 46 392782
Screw ,,Cylinder Head (2., t5/16" long) 47 93783
Screw- Cylinder Head (1 !5/16" long) 48 223055
Rug,, Oil Drain 49 394391
Crankshaft 50 270981
Cover Assembly- Crankcase 51 222700
Seal. Oi! 52 93053
Screw- CrankcaseCover Mtg, Sam 53 93851
Piston Assembly •Standard (Inc, 54 394396
Key No_s,20 & 22) 55 66538
PistonA_embly ...010" O.So 56 93448
PistonAssembly- ,020" O,,S, 57 222698
PistonAssembly - °030" O,So 58 220863
Ring Set- Piston, Standard 59 222773
Ring Set., Piston- ,010" O.S, 60 261363
Ring Set, Piston- ,020" O,S. 61 393606
Ring Set- Piston- °030" O,& 62 393741
63 231218
Dipstick and Tube Assembly (inc. 54 210940
Key No's 44, 45 & 46) 65 261463
Lock- Piston Pin 66 261559
Pin Assembly ..Piston -Standard 67 391115
(Inc. Key NOD22) 68 230318
Pin Assembly. Piston..,005"O.S 69 92791
Rod Assembly- Connecting 70 93722
Dipper- Connecting Rod 71 261528
Screw. Connecting Rod 72 92268
Valve Exhaust 73 261623
Spring, Intake Valve 74 261560
Spring ,.Exhaust Valve
Retainer • Intake Valve
Rotocoil ,,Exhaust
Retainer ..Exhaust Valve Rotocoil
Tappet ,,Valve
Gear. Cam
Foam Seal. Governor Shaft
Pipe. Fuel {Inc. Key No. 52)
Gear. Governor
Wrench - Spark Plug
Washer..Gov. Crank (inside)
Plug. Spark (Resistor) (2 ,.3/8 high- 60
mm)
Nut- Hex 8- 32
Terminal
Grommet _insulator
Cap and Dipstick ,_Oil Filler
Sealo Filler Tube
Tube° Oil Filler
Screw ,,Hex Hd_
Trough - Dipper
Base. Engine
"Gasket, Engine Base
Baffle. Air
Clamp° Fuel Pipe
Retainer. E-Ring
Crank • Governor
Elbow- Spark Plug
Plug. Hex Socket
Key- Flywheel
Washer
Washer - Thrust
Gear° Timin_
SeatAssay,and Retainer
Bearing,, Ball (P.T.O. side)
+Guide. Exhaust Valve
+Seat- Exhaust Valve (Standard)
+Seat _.Intake VaNe (Standard)
Lower Bushing- Gov_
Wire ,,Ground
Connector _Fuel Pipe
Washer. Lock Shakeproof
Terminai ,,Spade
Valve,, Intake
Washer
+ Bearing- Cyiinder
Upper Bushing -Governor
*inc,, in Gasket Set - 394501
+Special Too{s required to install