242-0673 camshaft for CAT engine spare part

242-0673 camshaft for CAT engine spare part Featured Image
  • 242-0673 camshaft for CAT engine spare part

Short Description:

Camshaft with timing gear for Caterpillar C9 / C-9 engine, drives valve train, precisely controls intake and exhaust valve timing, overhaul replacement for 330D, 336D excavators.

Product Detail

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description

This camshaft is a core valve-train assembly for C9 electronic diesel engines. It comes pre-assembled with timing drive gear. Cam lobes actuate hydraulic tappets and rocker arms to control valve lift and timing, matching ECU fuel map. It is widely used on medium excavators, motor graders and earthmoving machinery.
It is forged steel with induction hardened cam surfaces for uniform hardness and good resistance to pitting and spalling under cyclic impact loads. Journals, cam profiles and gear mounting reference are machined strictly to OEM drawings with stable timing reference.
This is an integrated assembly with timing gear, different from 242-0674 which has different timing profile and cannot be interchanged. It should be matched with correct camshaft bushings, hydraulic tappets and pushrods to maintain concentricity and reduce premature wear.

Part Number: 242-0673
Name: Engine camshaft with timing gear
Applicable Models: Caterpillar C9, C-9 engine; 330D, 336D, 340DL excavator, 140M motor grader
Interchange Part No.: 10R-8728
Height (in): 10.5
Length (in): 37.5
Material: Forged steel, cam surface induction hardened
Type: New complete assembly
Function: Drive valve train and control valve timing

Product Advantages

1. Forged steel base with hardened cam lobes, wear and impact resistant for long-term earthmoving operation of C9 engine
2. Pre-assembled timing gear with clear timing marks, easy alignment and less calibration error
3. Cam lift and timing profile calibrated for C9 electronic control system, stable power and fewer fault codes
4. Supplied as complete assembly, saves separate gear sourcing and shortens excavator downtime

FAQ 

Q: What faults are caused by pitting and spalling on cam lobes?
A: Insufficient valve lift, poor air flow, power loss, higher fuel consumption and valve train noise, engine derate in severe cases.

Q: Can 242-0673 interchange directly with 242-0674?
A: No. They have different timing profiles for different C9 versions, interchange will lead to timing failure and emission trouble.

Q: C9 uses hydraulic tappets. Do I need repeated valve lash adjustment after camshaft replacement?
A: Hydraulic tappets compensate clearance automatically. Follow timing assembly and check valve noise after break-in.

Q: What risk if only replacing camshaft without changing bushings?
A: Worn out-of-round old bushings create abnormal clearance with new journals, which may score the camshaft quickly and cause premature failure.

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