Cat 257B3 Series 3 Crankshaft Specifications 

Cat 257B3 Series 3 Crankshaft Specifications 

Cat 257B3 Series 3 Crankshaft Specifications 

Standard Main Crankshaft Journal Diameter 77.955 - 77.970 MM 
Standard Rod Journal Diameter 57.955 - 57.970 MM 
Oil Clearance Between Main Crankshaft Journal and Main Bearing 0.050-0.110 MM
Oil Clearance Between Rod Crankshaft Journal and Rod Bearing 0.030-0.090 MM
Deflection or Bend , Assembly Standard, 0.02 MM
Deflection or Bend , Repair Limit, 0.05 MM 
Center to Center Distance Between Main Journal and Rod Journal, Assembly Standard, 60.00 MM 
Center to Center Distance Between Main Journal and Rod Journal, Tolerance, plus or minus 0.04 MM
Parallelism Between Main Journal and Rod Journal, Tolerance, less than 0.01 MM 
Circularity of Main Journal, Tolerance, less than 0.01 MM 
Circularity of Rod Journal, Tolerance, less than 0.01 MM 
Taper of Main Journal, Tolerance, less than 0.01 MM 
Taper of Rod Journal, Tolerance, less than 0.01 MM 
Filet Radius of Main Journal, Assembly Standard, 3.00 MM plus or minus 0.20 MM 
End Play of Crankshaft, Assembly Standard 0.100 - 0.264 MM   
(6) Flywheel To Crankshaft Bolts Size M12 x 1.25 
(2) Flywheel To Crankshaft Dowel Pins 
(1) Front Crankshaft Pulley Bolt Size M30 x 1.50 

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Cat 257B3 Series 3 Multi Terrain Loader Engine Parts 

Note: These newer Cat C3.4 DIT Series 2 engines and Cat C3.4 DIT Series 3 engines can have different pistons, compression ratios, different crankshafts, and different internal parts than the older 3044 and C3.4 engine. Please provide your serial number to determine the correct parts for your engine.

Heavy Equipment Restoration Parts LLC
4730 118th Ave
Fennville Michigan 49408 USA
Phone: 269 673 1638
Fax: 269 673 7226

email: EngineParts@HeavyEquipmentRestorationParts.com
alternate email: EngineParts2@gmail.com

Website: www.HeavyEquipmentRestorationParts.com