New Basic Engine Components Are Used in C175-16 Engines {1202, 1205} Caterpillar


New Basic Engine Components Are Used in C175-16 Engines {1202, 1205}

Usage:

C175-16 M6A
Engine
C175-16 (S/N: M6A1-UP)

Description Of Change: The following new components have been changed to increase the durability of the engine:

Crankshaft



Illustration 1g02942880
Crankshaft

  • The diameter of the pin journal was reduced by 8 mm.

  • The straight length of the pin journal was increased by 4 mm but the overall length of the crankshaft was not increased.

  • The oil hole pattern was optimized to reduce cavitation.

  • The dowels on the front and rear of the crankshaft were removed. For better serviceability, the dowels are now pressed into the rear crankshaft gear, the flywheel, and the damper.
Connecting Rod


Illustration 2g02943082
Section view of the connecting rod

  • The connecting rod bore diameter was decreased by 7 mm (3.5 mm from each side). As a result, the thickness of the mating section for the connecting rod and the cap was increased. The thickness increases the rod stiffness and reduces bending under a load.

  • A honed pattern was designed into the bearing bore instead of the previously shot-peened surface.

  • The angle of the oil passage was changed from entering the bore at 15 degrees past top center to 40 degrees. The relocation of the oil passage moves the hole further from the loading zone.

  • The oil hole for the rod eye bushing was relocated.
Bearing


Illustration 3g02943085
Bearing

  • The wall thickness was increased by 0.5 mm, which allows higher and more consistent contact pressure between the outer bearing diameter and the rod bore.

  • The oil hole is now slotted and offset 40 degrees past the top center of the rod.

  • Install the 376-6457 Connecting Rod Bearing in any of the new connecting rods for the odd-numbered cylinders.

  • Install the 376-6458 Connecting Rod Bearing in any of the new connecting rods for the even-numbered cylinders.

Note: Do not mix the bearing halves between the different part numbers.

Crankshaft Vibration Damper

  • The new damper is an oil fed damper which was needed to accommodate the dynamic changes of the crankshaft.

Adaptable To: The changes are effective with the following serial numbers:

  • M6A00109
The new components are not individually compatible with engines that were built prior to the effective engines. However, an engine can be updated with all the parts.

All the related parts are listed in Table 1

Table 1
Qty  New Part  Original Part 
146-3173 Dowel
(Damper) 
1S-2199 Dowel 
286-5311 Dowel
(Flywheel) 
 
345-8567 Dowel Pin
(Rear crankshaft gear) 
 
356-7064 Crankshaft  317-8521 Crankshaft 
357-6282 Bushing  229-9809 Bushing 
394-9595 Damper Gp  317-1640 Damper Gp 
366-5649 Spacer  269-0588 Spacer 
370-6546 Flywheel As  334-8988 Flywheel As 
417-7902 Connecting Rod  316-0062 Connecting Rod 
417-7903 Connecting Rod  316-0063 Connecting Rod 
378-5615 Crankshaft Gear  254-2075 Crankshaft Gear 
376-6457 Connecting Rod Bearing  322-3031 Connecting Rod Bearing 
376-6458 Connecting Rod Bearing  322-3030 Connecting Rod Bearing 
421-3978 Stub Shaft As  361-8834 Stub Shaft 
12  388-1521 Bolt  276-8999 Bolt 

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