Bobcat 741 - Page 355

ENGINE SPECIFICATIONS, 743 (Kubota) (Cont'd)
All dimensions are given in inches. Respective metric dimensions are given in millimeters enclosed by parentheses.
Cylinders
1.0 . of . Cylin~er Liner (Std.) . . .. : .. . . .... . ... .. .. .. .. . .. ... . ... . .. . . . ... .. ... . ... 3.2283-3.2291 (82 , 0-82 ,019)
Oversized
Liner 1.0 . (After Rebonng .020 O/S) . ... .. . ............ .. . .... . . . ..... . 3.248-3.2489 (82,499-82,522)
Wear Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 0.0059 (0,15)
Piston Rings
Ring Gap (Top and 2nd Ring) .... . . . ........ . .. .. ... .... . .. . .... .. ..... ... . . ...... 0.0118-0.0177 (O,30-3,45~
limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0492 (1 ,25
Ring Gap (Oil Ring) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0098- .0157 (0,25-0,40
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0492 (1,25)
Side
Clearance of Ring Groove
Top Ring .... . ....... . .... ... . .... ... . ..... . ... .. .. ..... . .. .... . .. ....... ............ ...... .. 0 clearance
Second Ring . .. .. . .. .. ....... . ......... ... ..... . . .... . . . ........... ... . . ..... 0.0037-0.0047 (0,093-0,120)
Oil Ring .... ... .. . . ... ..... ... .. . .. . ....... . .............. . ....... .. .. . ...... 0.0008-0.0020 (0,020-0,052)
Pistons
1.0. of Piston Bosses ..... .. ..... . ... ... ... ............ . ... ... . .... . ..... .. .. . ... 0.9055-0.9060 (23-23,013~
Limit Perf!1itted '. ' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.9076 (23,053
0.0. of Piston Pin .. . . . .... . .... . .... .. ....... .. . . . .. .... .. .. . .... . .......... 0.9056-0.9059 (23,002-23, 011
Clearance Between Piston Pin and Bushing .... .... ...... .. .............. . . . ...... 0.0006-0.0015 (0,015-0,038
1.0. of connect Rod Busing (Small End, Fitted) ... .... . .. .... .. . .... .. ... ......... 0.9065-0. 9071 (23,025-23,04l
Service Replacement
Part .. ... . ....... . .................. . .. . . .. . .. ..... . . . . . .. 0.0006-0.0026 (0,015-0,07
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .0059 (0,15
Connecting Rod Alignment .. . .. .. .. ........... ...... .. .. ................ . .... ............... . 0.0008 (O,02~
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002 (0,05
Connecting Rod Big End 1.0 ... . . . . . ...... . .. .... ... ....... .. ... .. . . ... (W/O Bearing) 1.850-1.851 (47,0-47,02
Crankshaft
0.0. Main Bearing Jo.urnals ' . .......................... ............ . ...... . .. .... 2.0441-2.0449 (51,92-51,94)
1.0 . of Crankshaft Main Beanng (No.1) ... . .... .. ............ . .... ..... . . . ... .... 2. 0465-2 .0488 (51,98-52,039)
1.0 . of Crankshaft Main Bearing (No. 2) .......................................... 2.0465-2.0482 (51,98-52,025~
Clearance Between Crankshaft Journal and Bearing ....... . ........ .. ............ . .. 0.0013-0.0042 (0,03-0, 11
Limit Permitted '.' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0079 (0,2
0.0. of Conne~tlng Rod Jou~nals ....... . ..... ... . ..... ..... . . . . . .. . ....... .... 1.7307-1 .7313 (43,959-43,975l
1.0 . of Connecting Rod Beanngs ..... .. .. ............ .. .. ... ... .. .. ... ..... . .... 1.737-1.7343 (44,01-44,052
Clearance Between Connecting Rod Journal and Bearing .. .. ... .. . .......... . ...... 0.0014-0.0037 (0,035-0,093
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0079 (0,2
End Play of Crankshaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0059-0.08 (0 ,15-0,21)
Thrust
Plate Thickness:
Stand~rd ......... .. .. .. . .. .. . .. ... ..... . ..... .. ....... .. ... . ....... . .. .. . ....... 0.091-0.093 (2,31-2,36)
Oversize .. ......... .. .. . . ... . ... . . ...... ... . ... . ... . ... . .. .. ..... .. .. ... ..... . 0.0935-0.0955 (2,37-2,43)
0.101-0.103 2,57-2,62
0.096-0.098 ~2'44-2,49l
0.0985-0.1005 2,50-2,55
Crankshaft Journal U/S (Oia.) . ..... . .. ........... . .... . . . .. . ...... ... .. . .. .. ..... 2.0363-2.037 (51 ,72-51,74
2.0284-2.0291 (51,52-51,54)
Oil Pump
Oil Pressure @ rated RPM .. . .. . .. . ................. ..... . ....... ... . . .......... . . 42-56 PSI (290-386 kPa~
Limit Permitted .. ... . .. . ..... .. .. . .. ........ ....... . ........... ........ . ... ....... .. . .. . .. 36 PSI (248 kPa
Rotor Lobe Clearance ...... . . ..... . .... . . ....... . . . . . .. .. .. . ... ............. . ... . 0.0039-0.0063 (0,10-0,16
Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0079 (O ' 20~
Clearance Between Outer Rotor And Pump Body .. ... ..... .. .... .. .................. 0. 0043-0 .0075 (0,11-0,19
Limit
Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.0098 (0,25
Engine Oil
Specifications
Check oil level every 8 hours of operation. (Check oil every 4 hours on new engine during the first 50 hours of operation.)
Oil level must be between the add and full marks on the dipstick. Use a good quality detergent motor oil that meets the
correct
API service classification. (See Chart on Page 8C-7.)
Use oil of the correct SAE viscosity for expected temperature conditions.
Revised June 91
-8C-4-
741, 742, 743 & 7430S Bobcat Loader
Service
Manual