Bobcat 741 - Page 340

ENGINE SPECIFICATIONS
All dimensions are given in inches. Respective metric dimensions are given in millimeters enclosed by parentheses.
Displacemnt ...... . .............. . ...... .. ... ....... . .. .. . . . ......... ........ ...... .. . 101 cu.in (1650 cm
3
)
Bore ......... ... .... . .... .......... .. . ........ .. .. . .. .................... . .... .. .. ....... 3.937 (100 mm)
Stroke .... . .... . ........ .. ........ ............ . ... .. ... ... ... .......... ... ...... ..... .... 4.134 (105 mm)
Firing Order . . ... .... .. .... ......................... .. .. .... ........... . . ... . ..... . .. ......... . . . ... 2 - 1
Oil capacity W/Filter .... ...... ........... .. .. ..... . . . .. .......... .. ....... ... .. ......... 1 gallon (3 ,79 liters)
Compression Pressure . .
... .. . . .... .. ..... .. .. ... . .. ...... . ...... .. . ..... . ........... . 42~55 PSI (29-31)
NOTE: The
cylinders must be within 35 PSI (241 kPa) of each other.
Fuel System
Pressure of Fuel Lift Pump ... .. . ... ..................... ... . ............. ........... 4-5 PSI (0,28-0,35 bar)
Make of
Fuel Injection Pump ........................................................................ Bosch
Make of
Fuel Injection Nozzle .............................. . . ... .......... . ... ..... . . . Bosch DLLA 149 s 774
Release Pressure of
Injection Nozzle (New) . .. ..... .. . . . ......... . ........... . .. . 2604-2720 PSI (18~188 bar)
(Used)
............... . . . ... .. ... . ............. 2532-2648 (175-183 bar)
Injection Timing
(Start of Injection) ............................. . .................... 25° B.T.D.C. capillary tube
Distance from
Injection Pump Mounting Flange to Camshaft Base Circle
(Including
gasket and shims) ..... ......... . . ................................ . 3.2519-3.2559 (82, 6-82,7 mm)
Governor, Front Cover and Throttle
Distance from Governor Bearing Cup to Engine Block .... .................... ... ... 3 . 37~3.374 (85,6-85,7 mm)
End Play in Throttle Shaft ...................... . .. ...... . ............................ 008-0.43 (0,2-1,1 mm)
Engine High Idle Speed (295~3000 RPM) ...... . ... ...... . ........................ 2800 RPM (Under full load)
Engine Low Idle Speed .............. ....... . ...... ......................... .. ... .... .. . ... 105~1150 RPM
Cylinder Head and Valves
1.0. of Valve Guides ........................................................... .3149-.3156 (8,~8,015 mm)
1.0. of Bore for Exhaust Valve Seat ... . . ................... .. . ........................... 1.576 (40,~O,025)
1.0. of Bore for Intake Valve Seat .... ..... ....... .......... ......... ........ ....... 1.791-1.792 (45,5-45,525)
Valve Seat Width, Inlet .. .............................. ... ...... .. ....... .... .. . ......... 059-.0826 (1,5-2,1)
Valve Seat Width, Exhaust. .. .. .. ............... ... . . .............. ..... .......... .... ... 059-.0826 (1,5-2,1)
Valve Seat Angle, Exhaust and Intake ....... . ... . ......................... .. ............................ 45°
Valve Stem Diameter, Intake ....................................................... 3128-.3134 (7,945-7,960)
Valve Stem Diameter, Exhaust ........... . ...... .. . .. ...... . ......................... 3118-3.126 (7,92-7,94)
Maximum Distance
Valves may be Recessed into Head ................................ . .. . ..... . . 232 (5,9 mm)
MaximumClearance, Cold, Intake and Exhaust ............ . .............. .. ................... .006 (0,15 mm)
Minimum Free Length of Valve Springs ................ .................. .. . . ... ................ 2.32 (59 mm)
Length of Head Bolts ........... . .. . . . . . ............................. ... ......... 7 . 4~7.42 (188-188,5 mm)
Cylinder, Piston and Connecting Rod
Cylinder Bore (Standard) . .. . .. .. . .... . ............................... ... 3.937-3.9378 (1oo,~100,022 mm)
Maximum Wear Limit ................ ... ... ... .... ............. .......... . ... .. ............... 012 (0,3 mm)
Piston Diameter (Standard) ............ . ...................... . .......... ...... 3.9354-3.9358 (99,96-99,969)
Piston Diameter (1st oversize)
.. . ..... .. .... ... .. ..... ........... .... . .. 3.9551-3.9554 (100,461-100,469 mm)
Piston Diameter (2nd oversize) .. ... . .. .... ... . .... .................... . . 3.9748-3.9752 (1oo,96~1oo,969 mm)
Wrist Pin Bore . . . .. .... .. ... . . ....... . . . ....................... .... .. ....... 1.3781-1.3783 (35,004-35,010)
Wrist Pin Diameter .......................................... ... ..... ... .... 1.3777-1.3780 (354,994-35,000)
Piston Ring
Side Clearance, Top Compresstion Ring .............. ... .. .. ........ .0041-.0057 (0,105-0,145 mm)
Revised Sept. 90
-SA-3-
741, 742, 743 & 7430S Bobcat Loader
Service Manual