2104881 | Genuine Paccar® Camshaft Gear MX-13 For DAF XF106

1. Timing Valve Operation with Piston Movement

Ensures intake and exhaust valves open and close at the correct time in the 4-stroke cycle.
Keeps the engine in perfect timing, allowing efficient combustion.

2. Transfers Rotational Motion

Transfers motion from the crankshaft to the camshaft using gears (or via timing chain/belt).
In most 4-stroke engines, the camshaft gear rotates once for every two rotations of the crankshaft.

3. Maintains Engine Performance and Efficiency

Proper valve timing enables:
Better fuel combustion
Increased power output
Lower emissions
Improved fuel economy

4. Prevents Engine Damage

Keeps pistons and valves from colliding (in interference engines).
If the camshaft gear slips or fails, it can cause serious engine damage due to incorrect timing.

1. Engine Misfires or Runs Rough

Timing is off, so valves open/close at the wrong time
Causes uneven power delivery or shaking during idle
May trigger a check engine light

2. Engine Won’t Start or Hard Starting

If the camshaft gear is severely damaged or slipped, the camshaft won’t rotate in sync with the crankshaft
The engine may crank but not fire

3. Loss of Power or Poor Acceleration

Incorrect valve timing reduces combustion efficiency
Leads to sluggish response, poor fuel economy, or lack of torque

4. Tapping or Knocking Noises

Worn gear teeth can lead to improper valve movement
You may hear metallic ticking from the valve train or timing area

5. Excessive Smoke from Exhaust

Mistimed valve operation may cause incomplete combustion
May result in black, blue, or white smoke, depending on what’s being burned (fuel, oil, or coolant)

6. Timing-Related Trouble Codes (DTCs)

Modern engines may detect issues via cam/crank position sensors
Possible codes:
P0016 (Cam/Crank Correlation)
P0340 (Camshaft Position Sensor Circuit Fault)
Others related to valve timing

7. Visible Damage (if inspected)

Worn or chipped gear teeth
Gear backlash (looseness)
Damage may occur alongside a failed camshaft, cam sensor, or timing components

8. Valve or Piston Damage (in severe cases)

In interference engines, a failed camshaft gear can cause valves and pistons to collide, leading to catastrophic engine damage