127-8261 left rear camshaft for CAT engine spare part

127-8261 left rear camshaft for CAT engine spare part Featured Image
  • 127-8261 left rear camshaft for CAT engine spare part

Short Description:

Left rear camshaft for Caterpillar 3516 / 3516B V-engine, drives valve and unit injector tappets, controls valve and injection timing, overhaul replacement for mining trucks and generator sets.

Product Detail

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description

This camshaft is dedicated to the left rear bank of Caterpillar 3516 / 3516B V-engine. Cam lobes actuate valve and unit injector tappets to control valve operation and injection timing. The V-engine uses separate front and rear camshafts with unique profiles, they cannot be swapped, serving as core timing component for mechanical injection heavy-duty engines.

It is manufactured from carbon steel with hardened cam contact surface for good impact and pitting resistance under continuous mining and power generation loads. Internal oil gallery connects to main oil passage to feed lubrication to journals and cam lobes and reduce scoring and spalling.

It fits Caterpillar 3516, 3516B engine, widely used on 793C, 793D mining dump trucks and large generator sets. The left rear camshaft has unique profile, not interchangeable with left front, right front or right rear camshaft. Verify part number and engine serial number before installation.

Part Number: 127-8261
Name: Left rear camshaft
Applicable Models: Caterpillar 3516, 3516B engine; 793C, 793D mining truck, large generator set
Height (in): 9.5
Length (in): 51.0
Material: Carbon steel, hardened cam surface
Type: New part, drive gear not included
Function: Drive valve and injector tappets, control valve and injection timing for left rear cylinder bank

Product Advantages

1. Carbon steel base with hardened cam lobes, impact and wear resistant for long continuous heavy-duty operation of 3516 series
2. Dedicated left-rear cam profile with OEM injection and valve lift setting for balanced cylinder combustion
3. Internal oil passage provides steady lubrication and reduces scoring risk under prolonged high load
4. Precise journal tolerance maintains stable clearance with camshaft bearings, reliable timing after overhaul

FAQ 

Q: What faults are caused by pitting and spalling on cam lobes?
A: Reduced injection lift, delayed injection timing, power loss, rough idle and black smoke, multi-cylinder misfire in severe cases.

Q: Can 127-8261 be swapped with left front camshaft?
A: No. Front and rear camshafts have different lift and timing profiles, interchange will lead to total injection and valve timing failure.

Q: What happens if oil passage is blocked?
A: Cam journals and lobes lose lubrication and score rapidly, leading to premature camshaft failure and tappet damage.

Q: What risk if only replacing camshaft without changing bearings?
A: Worn out-of-round bearings create abnormal clearance and score the new camshaft journals quickly.

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