About the Massey Ferguson MF135

Massey Ferguson developed a wide range of agricultural vehicles and have a large share in the market across the world especially in Europe. The next big selling model was the MF135, widely popular because of its reliability and power compared with other tractors at the time. This was the first model in the MF 100 series. The Massey Ferguson 135 is a popular tractor. In fact it is one of the most popular tractors for vintage and classic enthusiasts.

Massey Ferguson MF135 and MF148 Tractor factory workshop and repair manual

### Valve Adjustment on Massey Ferguson MF135 M148 Tractor

#### Tools Needed:
1. **Socket set** (including 10mm and 12mm sockets)
2. **Torque wrench**
3. **Feeler gauges**
4. **Wrench set** (including 13mm and 17mm wrenches)
5. **Screwdriver set**
6. **Pliers**
7. **Shop rags**
8. **Engine oil** (for lubrication if necessary)

#### Replacement Parts:
- **Gasket set** (if replacing the valve cover gasket)
- **Valve adjustment shims** (if shims are required)

#### Safety Precautions:
1. **Ensure the tractor is parked on a level surface** and the engine is off.
2. **Engage the parking brake** to prevent movement.
3. **Disconnect the battery** to avoid electrical hazards.
4. **Allow the engine to cool down** before starting work.
5. **Wear safety glasses** to protect your eyes.

### Step-by-Step Procedure:

1. **Preparation:**
- Gather all tools and parts.
- Place the tractor in neutral and engage the parking brake.

2. **Remove the Valve Cover:**
- Remove any accessories that obstruct access to the valve cover.
- Use the appropriate socket to remove the bolts securing the valve cover.
- Carefully lift the cover off, ensuring the gasket remains intact or noting if it needs replacement.

3. **Check Engine Position:**
- Rotate the engine to Top Dead Center (TDC) on the compression stroke for the cylinder you are adjusting.
- You can do this by turning the crankshaft using a socket on the crankshaft pulley bolt.

4. **Check Valve Clearances:**
- Use feeler gauges to measure the clearance between the rocker arm and the valve stem.
- Check the specifications in the manual for the correct clearance for both intake and exhaust valves.

5. **Adjust Valves:**
- If the clearance is outside the specified range, you will need to adjust it.
- Loosen the lock nut on the rocker arm using a wrench.
- Turn the adjusting screw with a screwdriver or wrench to achieve the correct clearance using feeler gauges.
- Once the desired clearance is achieved, hold the adjusting screw in place and tighten the lock nut carefully.

6. **Repeat for All Valves:**
- Move to the next cylinder by rotating the crankshaft to TDC for each one in turn.
- Continue adjusting until all valves are set to the correct clearance.

7. **Reinstall the Valve Cover:**
- Check the valve cover gasket for wear; replace it if necessary.
- Position the valve cover back on and tighten the bolts to the manufacturer’s specifications using a torque wrench.
- Ensure even tightening in a crisscross pattern to prevent warping.

8. **Reconnect Battery and Test:**
- Reconnect the battery.
- Start the engine and listen for any unusual noises.
- Let it idle for a few minutes and ensure smooth operation.

### Common Pitfalls to Avoid:
- **Not rotating to TDC**: Adjusting valves at the wrong position can lead to incorrect settings.
- **Forgetting to check all valves**: Ensure all valves are adjusted before replacing the cover.
- **Over-tightening the valve cover**: This can lead to a warped cover or damage to the gasket.
- **Neglecting to replace worn parts**: Always check for wear on gaskets or shims and replace as necessary to avoid leaks or incorrect adjustments.

By following these steps and precautions, you can successfully adjust the valves on a Massey Ferguson MF135 M148 tractor.
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