Yanmar 4TNV98-ZNMS, 4TNV98T-ZNMS, 4TNV98-ZNTBL, 4TNV98T-ZNTBL Parts Manual
Yanmar
4TNV98-ZNMS
4TNV98T-ZNMS
4TNV98-ZNTBL
4TNV98T-ZNTBL
Engines
(P/N’s 192809, 192808,
242474, 241451, 196108,
196340)
Form No.
917304
Revision C
07/09
Mustang 2066/76/86, 2700V
and Gehl 56/6640E, V270
Skid-Steer Loaders
Gehl CTL65/75 and
Mustang MTL316/320
Compact
Track
Loaders
ENGINE PARTS MANUAL
Introduction
This manual covers the Yanmar 4TNV98-ZNMS (and Turbocharged version) and 4 TNV98-ZNTBL (and
Turbocharged version) engines with the following part numbers:
Part Number 192809: Mustang 2066 (naturally-aspirated)
Part Number 192808: Mustang 2076 and 2086 (turbocharged)
Part Number 242474: Mustang 2066 (naturally-aspirated)
Part Number 241451: Mustang 2076/2086/2700V and Gehl 5640E/6640E/V270 (turbocharged)
Part Number 196108: Gehl CTL65 and Mustang MTL316 (naturally-aspirated)
Part Number 196340: Gehl CTL75 and Mustang MTL320 (turbocharged)
When ordering service parts, specify the correct part number, full description, quantity required, and the en-
gine model number and serial number.
Items shown that do not have a part number are shown for reference purposes only and are not available for
purchase. Part numbers may change. Your Gehl or Mustang dealer will have the latest part number.
Gehl® Company and the Mustang® Manufacturing Co., Inc., reserve the r ight to make changes or improve-
ments in the design or construction of any part of the unit without incurring the obligation to install such
changes on any previously delivered units.
IMPORTANT
For maximum engine life, when shutting the engine down, allow the engine to idle, without load, for five min-
utes. This will allow engine compon ents that operate at high temperatures to cool slightly before the engine
itself is shut down.
GEHL is a registered trademark of the Gehl Company.
MUSTANG is a registered trademark of the Mustang Manufacturing Co., In c.
TABLE OF CONTENTS
DESCRIPTION PAGE
ENGINE SERVICE PARTS
Cylinder Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Gear Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Flywheel Housing and Oil Sump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Cylinder Head and Bonnet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Suction Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Exhaust Manifold and Silencer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Camshaft and Driving Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Crankshaft and Piston. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Lubrication Oil System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Cooling Water System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Fuel Injection Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Governor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Fuel Injection Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Fuel Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Starting Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Electric Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Tool and Gasket Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Turbine (Turbocharged) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Lubrication Oil Line (Turbocharged). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Generator (-ZNTBL engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Numerical Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
CYLINDER BLOCK
1 917304/CP0709 PRINTED IN USA
CYLINDER BLOCK
Ref. Part Quantity
No. No. Description 4TNV98
1 197827 BLOCK ASSY, CYLINDER (ZNMS AND ZNTBL) 1
197831 BLOCK ASSY, CYLINDER (T-ZNMS AND T-ZNTBL) 1
4 186486 PLUG 55 1
5 425-34722 PLUG 1
6 186491 BOLT, METAL CAP 10
9 186493 BUSH, CAMSHAFT 1
10 425-34783 SPRING PIN 6X12 2
11 425-36260 PLUG PT3/8,SCREW 1
12 425-36260 PLUG PT3/8,SCREW 1
13 425-36260 PLUG PT3/8,SCREW 1
14 188757 PLUG 30 8
24 186494 BEARING ASSY, THRUST 2
27 186485 BOLT, HEAD 18
28 186513 GASKET,CYLINDER HEAD 1
29 186635 MAIN BEARING SET 5
32 197591 MAIN BEARING US=0.25 5
35 197592 BEARING,THRUST .25OS 2
PRINTED IN USA 917304/CP0709 2
GEAR HOUSING
3 917304/CP0709 PRINTED IN USA
GEAR HOUSING
Ref. Part Quantity
No. No. Description 4TNV98
1 188573 PARALLEL PIN 8X16 4
3 186586 CASE, GEAR (ZNMS AND ZNTBL) 1
197697 HOUSING,GEARS (T-ZNMS AND T-ZNTBL) 1
4 186543 PUMP ASSY, LUB.OIL (ZNMS AND ZNTBL) 1
197614 PUMP ASSY, LUB.OIL (T-ZNMS AND T-ZNTBL) 1
15 138139 STUD BOLT 4
16 138100 O-RING P20 1
17 138101 O-RING P14 1
18 186607 O-RING 1A P-7.0 1
19 186612 PACKING, 3075 1
20 425-34733 BOLT M 8X 16 PLATED 1
21 425-34746 BOLT M 8X 20 PLATED 3
22 425-34747 BOLT M 8X 45 PLATED 3
23 138141 NUT 4
24 425-34740 COVER,FILLER 1
25 425-34745 O-RING 1A P-32.0 1
26 186487 COVER, F.I. PUMP 1
27 186466 BOLT M 8X 70 PLATED 1
28 425-34733 BOLT M 8X 16 PLATED 1
29 188742 BOLT M 8X 40 PLATED 5
30 137948 COVER, HO-P 1
31 138127 O-RING 1A G-85.0 1
32 138133 BOLT M10X 20 PLATED 2
33 197826 HOUSING ASSY,COVER,G 1
35 186664 SEAL, OIL 1
36 186489 COVER ASSY 1
37 186490 SPONGE 1
38 186466 BOLT M 8X 70 PLATED 6
39 425-34733 BOLT M 8X 16 PLATED 3
40 188742 BOLT M 8X 40 PLATED 5
41 197593 BEARING #6205 1
42 186507 BALL BEARING 2
43 137947 CAP, LUB.OIL SUPPLY 1
44 185643 ADAPTOR, OIL FILLER (ZNTBL AND T-ZNTBL) 1
45 137949 PIPE (ZNTBL AND T-ZNTBL) 1
46 185644 NUT, OIL FILLER (ZNTBL AND T-ZNTBL) 1
47 185645 O-RING 1A P-30.0 ZNTBL AND T-ZNTBL) 1
PRINTED IN USA 917304/CP0709 4
FLYWHEEL HOUSING AND OIL SUMP
5 917304/CP0709 PRINTED IN USA
FLYWHEEL HOUSING AND OIL SUMP
Ref. Part Quantity
No. No. Description 4TNV98
1 188573 PARALLEL PIN 8X16 2
2 197590 COVER ASSY,FLYWHEEL (ZNMS AND T-ZNMS) 1
186576 HOUSING, FLYWHEEL (ZNTBL AND T-ZNTBL) 1
4 425-34756 CAP, FLY WHEEL COVER 1
5 186622 BOLT M10X 35 PLATED 9
6 186623 BOLT M10X 70 PLATED 4
7 197620 SEAL, OIL 1
8 197753 PAN ASSY, LUB. OIL (ZNMS) 1
197470 SUMP ASSY, LUB.OIL (T-ZNMS) 1
425-36120 SUMP ASSY, OIL (ZNTBL) 1
197664 SUMP ASSY, OIL (T-ZNTBL) 1
9 425-36121 DRAIN PLUG M22 1
11 138113 SEAL WASHER 22S 1
12 425-34729 BOLT M 8X 12 PLATED 16
PRINTED IN USA 917304/CP0709 6
CYLINDER HEAD AND BONNET
ZNMS AND ZNTBL Engines
7 917304/CP0709 PRINTED IN USA
CYLINDER HEAD AND BONNET
Ref. Part Quantity
No. No. Description ZNMS/ZNTBL
1 186519 LIFTER, ENGINE (ZNMS) 2
186519 LIFTER, ENGINE (ZNTBL) 1
197733 LIFTER,ENGINE (ZNTBL) 1
2 425-34733 BOLT M 8X 16 PLATED 4
3 186406 SEAT A,VALVE BRIDGE 8
4 197622 HEAD ASSY, CYLINDER 1
8 186602 PLUG PT1/4,SCREW 1
9 425-36260 PLUG PT3/8,SCREW 4
10 425-34779 PLUG 40 1
11 186520 VALVE(INT 8
12 186521 VALVE(EXH 8
13 186522 VALV E SPRING 16
14 425-35188 RETAINER, SPRING 16
15 197472 SEAL, VALVE STEM(EXH 8
16 425-35191 SEAL, VALVE STEM(INT 8
17 186529 BRIDGE ASSY,VALVE 8
19 425-34791 NUT M8XP1.0 8
20 186411 SCREW,VALVE BRIDGE 8
21 186410 GUIDE,VALVE BRIDGE 8
22 425-35189 COTTER ASSY 16
24 186533 GUIDE, VALVE 16
25 186337 PROTECTOR, NOZZLE 4
26 425-34796 SEAT, NOZZLE 4
27 186534 RETAINER,F.I.VALVE 4
28 197603 FLANGE BOLT,RETAINER 4
29 425-34776 O-RING 1A P 12.0 4
30 186314 BOLT 8X80 2
31 186528 SUPPORT CMP 1
32 186523 SHAFT,ROCKER ARM 1
33 186524 SUPPORT A 3
34 186525 SUPPORT B 2
35 186401 WAVE WASHER 8
36 186530 ARM ASSY, ROCKER 4
38 188596 SCREW, VALVE 4
39 425-34791 NUT M8XP1.0 4
40 186531 ARM ASSY, ROCKER 4
42 188596 SCREW, VALVE 4
43 425-34791 NUT M8XP1.0 4
44 186535 PEDESTAL,RETAINER 4
45 186624 STUD M 8X 22 PLATED 2
46 188742 BOLT M 8X 40 PLATED 2
47 188746 BOLT M 8X 60 PLATED 4
48 188746 BOLT M 8X 60 PLATED 2
49 138140 NUT 2
50 425-34740 COVER,FILLER 1
51 197621 BONNET ASSY 1
52 197601 BAFFLE PLATE 1
53 197602 BAFFLE 1
54 186518 BAFFLE 1
55 186388 DIAPHRAGM,BREATHER 1
56 186389 CENTER PLATE 1
57 186390 PLATE,BREATHER 1
58 186391 SPRING, DIAPHRAGM 1
60 197698 GASKET, BONNET 1
61 186335 PLUG 1
62 197779 CLIP 2
63 186598 SCREW 5X10,TAPPING 6
64 186598 SCREW 5X10,TAPPING 6
65 186615 BOLT M 6X 12 PLATED 2
66 425-34775 KNOB 4
67 425-34776 O-RING 1A P 12.0 4
68 425-34745 O-RING 1A P-32.0 1
PRINTED IN USA 917304/CP0709 8
CYLINDER HEAD AND BONNET
T-ZNMS and T-ZNTBL
9 917304/CP0709 PRINTED IN USA
CYLINDER HEAD AND BONNET
Ref. Part Quantity
No. No. Description T-ZNMS/T-ZNTBL
1 186519 LIFTER, ENGI N E 1
2 197668 LIFTER, ENGI N E 1
3 425-34733 BOLT M 8X 16 PLATED 2
4 425-34746 BOLT M 8X 20 PLATED 2
5 186406 SEAT A,VALVE BRIDGE 8
6 197670 HEAD ASSY, CYLINDER 1
12 186602 PLUG PT1/4,SCREW 1
13 425-36260 PLUG PT3/8,SCREW 4
14 425-34779 PLUG 40 1
15 186520 VALVE(INT 8
16 186521 VALVE(EXH 8
17 186522 VALV E SPRING 16
18 425-35188 RETAINER, SPRING 16
19 197472 SEAL, VALVE STEM(EXH 8
20 425-35191 SEAL, VALVE STEM(INT 8
21 186529 BRIDGE ASSY,VALVE 8
23 425-34791 NUT M8XP1.0 8
24 186411 SCRWE,VALVE BRIDGE 8
25 186410 GUIDE,VALVE BRIDGE 8
26 425-35189 COTTER ASSY 16
28 186533 GUIDE, VALVE 16
29 186337 PROTECTOR, NOZZLE 4
30 425-34796 SEAT, NOZZLE 4
31 186534 RETAINER,F.I.VALVE 4
32 197603 FLANGE BOLT,RETAINER 4
33 425-34776 O-RING 1A P 12.0 4
34 186314 BOLT 8X80 2
35 186528 SUPPORT CMP 1
36 186523 SHAFT,ROCKER ARM 1
37 186524 SUPPORT A 3
38 186525 SUPPORT B 2
39 186401 WAVE WASHER 8
40 186530 ARM ASSY, ROCKER 4
42 188596 SCREW, VALVE 4
43 425-34791 NUT M8XP1.0 4
44 186531 ARM ASSY, ROCKER 4
46 188596 SCREW, VALVE 4
Parts Listing Continued On Next Page
PRINTED IN USA 917304/CP0709 10
CYLINDER HEAD AND BONNET
T-ZNMS and T-ZNTBL
11 917304/CP0709 PRINTED IN USA
CYLINDER HEAD AND BONNET
continued from previous page
Ref. Part Quantity
No. No. Description T-ZNMS/T-ZNTBL
47 425-34791 NUT M8XP1.0 4
48 186535 PEDESTAL,RETAINER 4
49 186624 STUD M 8X 22 PLATED 2
50 188742 BOLT M 8X 40 PLATED 2
51 188746 BOLT M 8X 60 PLATED 4
52 188746 BOLT M 8X 60 PLATED 2
53 138140 NUT 2
54 425-34740 COVER,FILLER 1
55 197669 BONNET ASSY 1
56 197601 BAFFLE PLATE 1
57 197602 BAFFLE 1
58 186518 BAFFLE 1
60 197698 GASKET, BONNET 1
61 197449 JOINT, BREATHER 1
62 197572 CLIP 2
63 186598 SCREW 5X10,TAPPING 6
64 186615 BOLT M 6X 12 PLATED 2
65 425-34775 KNOB 4
66 425-34776 O-RING 1A P 12.0 4
67 425-34745 O-RING 1A P-32.0 1
68 197665 PIPE, BREATHER 1
69 197666 HOSE CMP, BREATHER 1
71 188632 CLAMP 22 2
72 197666 HOSE CMP, BREATHER 1
74 188632 CLAMP 22 2
76 425-34772 RETAINER 1
77 197475 HOSE, RETURN (T-ZNMS) 1
197667 HOSE ASSY,BREAZER (T-ZNTBL, INCLUDES PIPE PROTECTOR) 1
197692 PROTECTOR, PIPE 19 1
78 197749 MISTSEPARATOR ASSY 1
79 197747 COVER,SEPARATOR 1
80 197748 MISTSEPARATOR 1
81 138479 WOOL, STEEL 3
82 197810 BOLT M 5X 10 PLATED 4
83 197789 CLAMP 22 2
84 197792 HOSE, 16 X 250 1
85 425-36260 PLUG PT3/8,SCREW 1
86 425-34729 BOLT M 8X 12 PLATED 2
87 188736 BOLT 8X 14 PLATED 2
PRINTED IN USA 917304/CP0709 12
SUCTION MANIFOLD
ZNMS AND ZNTBL Engines
13 917304/CP0709 PRINTED IN USA
SUCTION MANIFOLD
Ref. Part Quantity
No. No. Description ZNMS/ZNTBL
1 186538 PACKING(INT.MANIFOLD 1
2 197624 MANIFOLD CMP,INTAKE 1
3 MANIFOLD,INTAKE 1
4 425-34780 STUD M 6X 20 PLATED 2
5 425-34747 BOLT M 8X 45 PLATED 6
6 425-34800 BOLT M 8X 80 PLATED 4
7 197450 GASKET 1
8 425-36318 GASKET, (NON-ASB.) 1
9 197705 HEATER, AIR 1
10 197451 BEND 1
11 188742 BOLT M 8X 40 PLATED 2
12 186618 BOLT M 8X 90 PLATED 2
PRINTED IN USA 917304/CP0709 14
SUCTION MANIFOLD
T-ZNMS and T-ZNTBL Engines
15 917304/CP0709 PRINTED IN USA
SUCTION MANIFOLD
Ref. Part Quantity
No. No. Description T-ZNMS/T-ZNTBL
1 186538 PACKING(INT.MANIFOLD 1
2 197672 MANIFOLD CMP,INTAKE 1
3 197671 MANIFOLD,INTAKE 1
4 197677 REEDVALVE 1
5 197678 SPACER(EGR VALVE 1
6 197679 GASKET(EGR-V SPACER 1
7 188732 BOLT M 6X 20 PLATED 3
8 188732 BOLT M 6X 20 PLATED 2
9 425-34780 STUD M 6X 20 PLATED 2
10 425-34747 BOLT M 8X 45 PLATED 6
11 425-34800 BOLT M 8X 80 PLATED 4
12 197750 RUBBER HOSE 1
13 197483 JOINT B 1
14 197476 DUCT,SUCTION 1
15 425-36131 CLAMP 54 3
16 425-36133 CLAMP 70 1
17 197450 GASKET 1
18 425-36318 GASKET, (NON-ASB.) 1
19 197705 HEATER, AIR 1
20 197451 BEND 1
21 188742 BOLT M 8X 40 PLATED 2
22 186618 BOLT M 8X 90 PLATED 2
PRINTED IN USA 917304/CP0709 16
EXHAUST MANIFOLD AND SILENCER
ZNMS Engine
ZNTBL Engine
17 917304/CP0709 PRINTED IN USA
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