Bobcat 741 - Page 354

ENGINE SPECIFICATIONS, 743 (Kubota)
All dimensions are given in inches. Respective metric dimensions are given in millimeters enclosed by parentheses.
Fuel Injection Nozzles
Opening Pressure ..................... . ......... ..... _. . . . . . . . . . . . . . . . . . . 1990-2130 PSI (13721-14686 kPa)
Fuel
Tightness Nozzle Seat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dry Nozzle at 1848-1990 PSI (12742-13721 kPa)
Fuel Injection Pump
Fuel Tightness of Plunger . ... . .. ................. 8 sec.: initial pressure from 8532-7110 PSI (58828-49023 kPa)
Limit Permitted ..................................................... ...... ................ 4 seconds or less
Fuel
Tightness of Delivery Valve ....................... 10 sec.: initial pressure from 1422-71 PSI (9805-490 kPa)
Limit Permitted . . . ... .......... ..................... . .. . .. . ... . ........... . .......... . .. .. 5 seconds or less
Injection
Timing . .................................................. ........ ...... 25-26 degrees before TDC
High
Idle . .. ....... ..... . . .................. . ............... ... . . .... . .......... .. .... .. . 2860-3000 RPM
Low Idle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 700-1000 RPM
Cylinder Head
Cylinder Head Surface Distortion .............................................. . . ............ ... 0.002 (0,05)
Thickness of Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.057 (1,45)
Thickness of Gasket Shims ............ .. ... . ......................... .... ...... 0.0059 or 0.0079 (0,15 or 0,2)
Top Clearance (Piston to Head) ..................................................... 0.0276-0.0354 (0,7--0,9)
Head Bolt Torque
Flange Head Bolt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 65-68 ft.-Ibs. (88-92 Nm)
Bolt WlWasher ... . .. . .. .............. . ............................. .. ..... ...... 58--68 ft.-Ibs. (79-83 Nm)
Maximum
Allowable Milling ........... ... ....................................................... 0.004 (0,1)
Valves
Valve Seat Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0827 (2,1)
Valve Seat Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 45 degrees
0.0. of Valve Stems (Intake and Exhaust) .......... .. ..... . .......... .. . ......... 0.3134--0.3140 (7,960-7,975)
1.0. of Valve Guides (Intake and Exhaust) .. .... . ............ . ..... . . . ..... . ...... 0.3156-0.3161 (8,015-8,030)
Clearance Between Valve Stem And Guide .................... ... . ... .. .. ........ 0.0016 to 0.0028 (0,04--0,07)
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0039 (0,1)
Depth of Valve . . ................ . .............................. . .................. 0.0433--0.0512 (1,1-1,3)
Valve Clearance (Cold) (Intake and Exhaust) ......................... . .. . ........... 0.0071-0.0087 (O,18--Q,22)
Valve Springs
Free Length . . ..... .......... .. ..... ... .. .. ....... .... .. .. . ... .......... .... . ... 1.6417-1 . 6614 (41,7-42 ,2)
Fitting Length ....... ... .... ........... . ...... ........................ . ................. . .. . 1.3839 (35,15)
Load to Compressed to Fitted Length .................. . .. .. . .. . . .. .. . ........ . ............. 26.5 Ibs. (118 N)
Limit Permitted ..................................................... .. ................... . 22.5 Ibs. (100 N)
Rocker Arms
0.0. of rocker Arm Shaft . . ..... ... .. ........ . ....... ...... . ... ............... 0.5501-0.5506 (13,973-13,984)
1.0. of rocker Arm Bushings .......... ......... ....... .............. .... .. . .... 0.5513--0. 5529 (14,002-14,043)
Clearance Between Rocker Arm and Bushings ....... . . .... ... . . . ... ............ .... 0. 0004-0.0028 (0,01--0,07)
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0059 (0,15)
Camshaft
0.0. of Camshaft Bearing Journal .......... . . ... .. . ........................... 1.5722-1.5728 (39,934-39,950)
1.0. of Camshaft Bearing ....... ...... ... . . . ..................... ... ....... ..... 1. 5748-1.5758 (40,0-40,025)
Clearance Between Camshaft Journal and Bearing ... .. . .. . .. .... ... . . ......... . . . .. 0.002-0 . 0036 (0,50--0,091 )
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0. 0059 (0,15)
Alignment of Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0008 (0,02)
Cam Lobe Height (Intake and Exhaust) . ...... .... ...... . . ............ . .. . .... . . ..... . ......... 1.3134 (33,36)
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1.3114 (33,31)
Gear Clearance (Backlash) .. ....... .... . .. . . . .. ............................. ... 0.0016-0.0045 (0,041--0,114)
Limit Permitted ............. .. ... ................. . .. .. ................... .- . . . . . . . . . . . . . . . . . .. 0 . 0118 (0,3)
Revised June 91
-8C-3-
741,742,743 & 7430S Bobcat Loader
Service
Manual