Bobcat 741 - Page 361

ENGINE SPECIFICATIONS
All dimensions are given in inches. Respective metric dimensions are given in millimeters enclosed by parentheses.
General
Compression PSI @ 250 RPM ......... .... ..... ................. .. . .. . ................ . . 150 PSI (1034 kPa)
Difference between Cylinders ....... . ........ . . . .............................. .. ..... ... ....... . Within 10%
Ignition
Timing (BTOC-with Vacuum Line Off) ............................................. 5° @ 700-750 RPM
Cylinder Head
Flatness of Head ........... ..... ... . . . ............................................... . . 0.002 (0,05) or less
Flatness
of Manifold Mounting Surface Service Limit ....... . ..... . .......... . ...................... 0.012 (0,3)
Oversize Valve Seat Hole
Intake 0.012 (0,3) O.S
.............................. . ........ . ... . ........ . .. .. 1.547-1.548 (39,300-39,325)
0.024 (0,6) O.S
......................................................... 1.559-1.560 (39,600-39,625)
Exhaust 0.012 (0,3) O.S . ......... .. . . ...... ... ...... ... . . .. ........ . . ... .. .... 1.350-1.351 (34,300-34,325)
0.
24 (0,6) O.S. . ... . ......................... ......... ... ............. 1.362-1.363 (34,600-34,625)
Camshaft cap to Camshaft Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.002-0.004 (0,05-0,9)
Service Limit .................................................................. ........... .. 0.006 (0,15)
Valve Guide Hole Oversize (Both Intake & Exhaust)
0.002 (0,05) O.S .......... . . . ......... ... .. .......... .. . ...... . ........ . .... . 0.5138-0.5145 (13,05-13,068)
0.010
(0,25) O.S . ....................... . .... . ..... .... .. .. ....... ... ....... . 0.5216-0.5224 (13,25-13,268)
0.020 (0,50) O.S ............ . ........... .. . .. ......... ... . . ......... . .. ...... 0.5315-0 .5322 (13,50-13,518)
Valve Seat
Contact Width ............................................................ 0.035-0.051 (0,9-1,3)
Valve Seat Angle ................................................. . ................................... 45°
Cylinder Block
Flatness of Cylinder Block ............... ... .... . ...... ...... . . .. . ... .. ........ .......... 0.002 (0,05) or less
Cylinder
Bore .................................................. . . .. . . ... . .................. 3.0276 (76,90)
Wear Limit
......... ............ .... .. . .. .. ... . ......... . ... ..... ... ........ .. ... ... ....... 0.008" (0,20)
Service Limit (Maximum Oversize) .............. .. ...... .. .. ... ..... . .......... ........ ....... +0.047 (+1,2)
Cylindrical Within Bore .............................................................. .. . 0.0004 (0,01) or less
Cylinder
to Piston Clearance ...................................................... 0.0008-0.0016 (0,02-0,04)
Piston
Piston 0.0 . @ Skirt .... ... ..... . ...... . . .. . .. ..... .. ... . .................................... 3.0276 (76,90)
Piston Pin Hole 1.0 .. .. . . .. ... ... .. .... . .... .... ............ . ......... . ........................ 0.748 (19,0)
Piston O.S .. .... . .... .......... ..... ... . ... ... ............. 0.010 (0,25); 0.020 (0,50); 0.030 (0,75); 0.039 (1,0)
Piston
Ring to Groove Clearance
Compression NO.1 ........... . ............ .. ..... .. ............................. 0.0011-0.0027 (0,3-0,07)
Service Limit .. .. . .... ... . ................................................................. 0.006 (0,15)
Compression
NO.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0008-0.0024 (0,02-0,06)
Service Limit ....................... ................. ...................................... 0.006 (0,15)
Compression Ring
Gap ................ . .... .. ................................... 0.0098-0.0177 (0,25-0,45)
Service Limit
......... ..... .. .. .... .. ....... ... ....... . ... . ..................... . ........... 0.039 (1,0)
Oil
Ring Gap .......................................................... .. ........... 0.0008-0 .028 (0,2-0,7)
Service Limit
.. .. .............. .......... ..... .... . ........ ....... .. . ....... .. . .. ........... 0.039 (1,0)
Piston
Ring O.S ............................................ 0.010 (0,25); 0.020 (0,50); 0.030 (0,75); 0.039 (1,0)
Piston Pin
Piston Pin 0.0 .... . ............ .. ....................... .. .................................... 0.748 (19,)
Piston to Piston Pin Clearance .. . . .............. . ... .... . ..... . .......... . ..... 0.00004-0.0005 (0,001-0,013)
Service Limit .... . .............. .. .. . ..... ... ............... ... ... . ...... .. .... . .. . .... .. .. 0. 0011 (0,03)
Interference
to Connecting Rod:
Press Fit Load (Normal Temp.) . . .. ............. .............. .... .. ... ........ 1101-3304Ibs. (500-1500 kg)
Revised Sept. 90
-80-3-
741, 742, 743 & 7430S Bobcat Loader
Service
Manual