MTD P90 series Shop Manual page 58

P90 Series Vertical Shaft Engines
2. Check the oil level.
NOTE: Top off the oil as needed with an SAE 10W-
30 oil with an SM API rating or better
3. Start the engine.
4. Let the engine run until the oil reaches operating
tempurature 176° - 212° (80° - 100°C).
5. With the engine at 3,300 RPM, the oil pressure
should reading be a minimum of 5 psi (0.3 bar).
See Figure 5.6.
NOTE: A reading below what is specified could be
the result of:
• Clogged oil screen
• Failed oil pump
• The oil pump gear failed
• The pressure relief valve is stuck open.
• Worn PTO bearing
• Worn rod bearing
• Engine is filled with the wrong oil.
NOTE: The pressure relief valve is not accessible. If it fails, the sump cover must be replaced.
• The ring gear on the balance shaft or the crankshaft (very rare).
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Figure 5.6