Positive Crankcase Ventilation Valve - MTD P90 series Shop Manual

Positive crankcase ventilation valve

Figure 5.7
Figure 5.8
Wire mesh
Figure 5.9
PCV cover
Fiber disc
Spring
Gasket
Spring
Fiber disc
The PCV valve is located under the flywheel and allows
the crankcase pressure to escape. The function and test
procedures for the PCV is covered in Chapter 2: Basic
Troubleshooting.
To service the PCV:
1. Remove the flywheel by following the steps described
in the Chapter 7: Ignition System.
2. Remove the five screws that hold the PCV chamber
cover to the engine block using a 10mm wrench.
See Figure 5.7.
3. The cover and gasket can be separated from the
chamber. See Figure 5.8.
NOTE: The dimple in the cover helps locate the fiber disc
over the port that leads into the crankcase.
4. Inspect the disc for any signs of dirt, damage or leak-
ing.
5. Inspect the folded wire mesh in the chamber.
See Figure 5.9.
Lubrication
53