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TRACTOR--MODELNUMBER917.272220
KOHLERENGINE-MODELNUMBERCV491,TYPENUMBER27501
CYLINDER HEADNALVE/BREATHER CRANKCASE
KEY PART KEY PART
NO. NO, DESCRIPTION NO. NO. DESCRIPTION
1 25o351-01-S Lifter, valve (2) 1 12-032-03-S Seal, crankshaft
2 12-755-94-S Kit, cylindernead (includes 2 12-522-49 Block, cylinder (Use Short
4,6-17, Gaskets 12 041 01- Block)
S (Qty. 2), 12 041 02-S, 3 12-445-02-S Strap, lifting
12 041 03-S, & 12 041 08-S) 4 M-839025-S Screw, hex. flange
M8x1.25x25
3 12-411-03-S Rod, push 2) 5 12-380-17-S Dowel, locating (4)
4 12_041-10-S Gasket, cylinder head 6 f2-755-49-S Kit, camshaft (Includes
5 12-017-0f-S Valve, intake (Std.)
12-017-02-S Valve, intake (.25) 7&8
6 12-016-01-S Valve, exhaust Std. 7 12-089-31-S Spring, actuating
12-016-02-S Valve, exhaust (.25) 8 12-422-08-S "Shim, camshaft (A.R.) blue
7 X-75-23-S Ping, allen hd. pipe 1/8" 12-422-09-S Shim, camshaft (A.R.) red
8 12-318-36-S Cylinder Head 12-422-10-S Shim, camshaft (A.R,)
9 25-186-01-S Arm, rocker (2)
10 12-599-03-S 12-422.11-S S II°w
ye
him, camshaft (A,R.)
Pivot, rocker arm (2)
11 M-540034-S Screw, hax. flange M6xl.Ox34 g.reon
12 12-089-34-S _ 12-422-12-S ::,him, camshaft (A.R.) gray
bring, valve 2) 12-422-13-S Shim, camshaft (A.R.) black
12-422.07-S Shim, camshaft (A.R.) white
13 12-173-01-S Cap, valve spring (2)
14 12-755-03-S Kit, retainer (2) 9 12-144-28-S Shaft, balance
15 12-468-O5-S Washer, plain 13/32" 10 12-874-07-S piston w/Ring Set Std.)
16 12-112-13_S Spacer, head bolt exhaust (Includes 11-12)
port 12-874-11-S Piston w/Ring Set (.08 ram)
17 f2-086-15-S Screw, hex, flange 12-874-08-S piston w/Ring Set (.25 ram)
MtOxf,5x81 5) 12-874-09-S Piston w/Ring Set (.50 mm)
18 ¢X-426-9-S Clamp, hose 2) 11 12-018-02-S Retainer, piston pin (2)
19 12-326-03oS Hose, breather 12 12-108-07-S Ring Set (Std.)
20 M-645020-S Screw, hex. flange 12-108-08-S Ring Set (.25)
M6xl.0x20 (5) 12-108-09-S Ring Set (.50)
21 12-096-07-S Cover, valve w/nipple 13 12-G67-11-S Connecting Rod (Std.)
22 M-545010-S Screw, hex. flange 12-067-06-S Connecting Rod (.25
M5xO.8xl0 14 12-380°01-S Pin, governor regulating
23 12-018-01-S Retainer, breather reed 15 12-043-05-S Gear, governor
24 12o402-02-S Reed, breather 16 M-631005-S Washer, plain 6ram
17 12-144-02-S Shaft, governor gear
18 52-139-09-S Plug, cup
19 12-755-64-S Kit, gov. cross shaft w/clip
(Includes 23)
20 X-25-102-S Washer, plain 1/4"
21 12-032-01-S Seal, governor cross shaft
22 M-631015-S Washer, plain 6mm
23 12-154-05-S Clip, hitch pin
NOTE: All component dimensions given in U.S.
inches 1 inch = 25.4 mm
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