127-8260 right rear camshaft for CAT engine spare part

127-8260 right rear camshaft for CAT engine spare part Featured Image
  • 127-8260 right rear camshaft for CAT engine spare part

Short Description:

Right rear camshaft for Caterpillar 3516 / 3516B V-engine, operates valve and unit injector tappets, controls valve and injection timing for this bank, overhaul replacement for mining trucks and large generator sets.

Product Detail

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description

This camshaft is dedicated to the right rear cylinder bank of Caterpillar 3516 / 3516B V-engine. Cam lobes drive valve and unit injector tappets to control valve events and injection timing. It differs from 127-8261 left rear camshaft in cam profile and phase, they cannot be swapped, core timing component for mechanical injection 3516 heavy-duty engines.

It is built from carbon steel with high-frequency hardened cam surfaces for good fatigue and pitting resistance under continuous mining and power generation loads. Internal oil galleries feed journals and cam lobes steadily to reduce scoring and spalling at high temperature.

It fits Caterpillar 3516, 3516B engines, widely used on 793C,793D mining dump trucks, 994 large wheel loaders and generator sets. Four camshafts (LF/LR/RF/RR) have unique profiles. Confirm part number strictly before installation.

Part Number: 127-8260
Name: Right rear camshaft
Reman Interchange No.: 20R-4963
Applicable Models: Caterpillar 3516, 3516B engine; 793C,793D mining truck, 994D/994F loader, generator set
Height (in): 9.5
Length (in): 55.0
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 right rear cylinder bank

Product Advantages

1. Carbon steel base with hardened cam lobes, fatigue and impact resistant for continuous heavy-duty operation of 3516 series
2. Dedicated right-rear cam profile with OEM injection and valve lift setting for balanced combustion of right rear cylinders
3. Through internal oil gallery ensures smooth lubrication and controls wear under high load
4. Tight journal runout control maintains stable clearance with cam bearings and reduces timing drift

FAQ 

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

Q: Can 127-8260 interchange with 127-8261 left rear camshaft?
A: No. Left and right rear camshafts have different lift and timing profiles, interchange will lead to 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 stuck tappets.

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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