108-6278 camshaft for CAT engine spare part

108-6278 camshaft for CAT engine spare part Featured Image
  • 108-6278 camshaft for CAT engine spare part
  • 108-6278 camshaft for CAT engine spare part
  • 108-6278 camshaft for CAT engine spare part

Short Description:

Camshaft with 86-tooth timing gear for Caterpillar 3412 engine, drives valve train, controls intake and exhaust valve timing, overhaul replacement for D10R bulldozers and large generator sets.

Product Detail

Product Tags

description

This camshaft is a core valve-train assembly for high-power 3412 V diesel engines. It comes pre-assembled with an 86-tooth drive timing gear. Cam lobes actuate tappets and rocker arms to precisely control valve lift and timing, matching fuel delivery timing of mechanical fuel pumps. It is widely used in mining bulldozers, heavy construction machines and power generator sets.

It adopts forged steel base with induction hardened cam working surfaces, featuring uniform hardness and strong resistance to pitting and spalling for long-term heavy and shock 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 bare shaft versions. No separate timing gear selection and fitting is required during overhaul. It must be matched with correct camshaft bushings, tappets and pushrods to maintain concentricity and reduce premature wear.

Part Number: 108-6278
Name: Engine camshaft with timing gear
Applicable Models: Caterpillar 3412 engine, D10R bulldozer, 773 mining truck, generator set
Height (in): 10.5
Length (in): 54.8
Material: Forged steel, cam surface induction hardened
Gear Teeth: 86 teeth
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 3412 high-power heavy-duty applications
2. Pre-assembled 86-tooth timing gear with clear timing marks, reducing alignment error during installation
3. Precise cam lift and timing profile to maintain stable engine power and controllable fuel consumption
4. Supplied as complete assembly, saving separate gear sourcing and shortening overhaul downtime

FAQ 

Q: What faults will worn camshaft gear teeth cause?
A: Timing drift, incorrect valve sequence, power loss and higher fuel consumption. Severe case leads to valve-piston contact and major engine damage.

Q: Can 108-6278 interchange directly with 108-6277?
A: No. They have different gear and timing parameters for different 3412 engine versions, interchange causes valve timing failure.

Q: What risk if only replacing camshaft without changing bushings on 3412 overhaul?
A: Worn out-of-round old bushings create abnormal clearance with new journals, which may quickly score the camshaft and cause premature failure.

Q: What to do if camshaft rotates stiff after assembly?
A: Check bushing pressing position, oil hole alignment and gear backlash first. Do not force crank rotation, inspect each item step by step.

our warehouse

our warehouse

Pack and ship

Pack and ship


  • Previous:
  • Next:
    • Write your message here and send it to us

    Products categories