347-1131 Caterpillar engine camshaft for engine spare part

347-1131 Caterpillar engine camshaft for engine spare part Featured Image
  • 347-1131 Caterpillar engine camshaft for engine spare part

Short Description:

347-1131 Caterpillar engine camshaft, fits early C6.6 EI engine, controls intake and exhaust valve timing, widely used on 320D, 323D excavators and wheeled construction machinery.


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description

The 347-1131 is one-piece camshaft for early C6.6 EI engine. It drives roller lifters to regulate valve opening and closing events. This engine is fitted on earthmoving excavators with frequent start-stop and heavy load shocks. Lobe pitting, spalling or journal scoring leads to weak power, rough idle, high fuel consumption and smoke. Severe damage causes valve-to-piston contact and valve train failure. This camshaft is supplied without timing gear. Functional original gear can be reused. It and 347-1134 are both for C6.6 but for different calibrations, not interchangeable.

Part No.：347-1131
Name：Engine Camshaft (without gear)
Fit Models：CAT C6.6 EI (early version)
Equipment：320D, 323D excavator, wheel loader
Material：Forged alloy steel with induction hardened cam lobes
Matching Components：Roller lifters, cam bearings, timing gear, thrust washer

Product Advantages

• Supports smooth and stable engine operation.
• Maintains synchronization with timing components.
• Converts rotational motion into linear valve movement.

1. OEM cam profile for early C6.6 EI calibration, stable low-speed torque delivery
2. One-piece forging with uniform grain, good fatigue resistance under site cyclic shock
3. Consistent hardened layer protects lobes and journals against abrasive oil contamination
4. Sold separately without gear, reusable functional gear reduces overhaul expense

FAQ 

1. Can 347-1131 interchange with 347-1134?
Interchange is not recommended. They are for different C6.6 calibrations with different lift and timing.

2. Does it fit C6.4 engine?
No. C6.4 and C6.6 EI differ in cam lift, journal size and mounting spacing, non-interchangeable.

3. Can the camshaft stay in service with minor scattered pitting and no cracks?
Pitting propagates under excavator shock load, replacement is recommended.

4. What risk if I install new camshaft and reuse old lifters?
Mismatched contact surfaces accelerate lobe spalling during break-in and lead to early failure.

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