MTD P90 series Shop Manual page 106

P90 Series Vertical Shaft Engines
5. Install the balance shaft by:
5a. Pre-lube the balance shaft with clean 10W-30
motor oil
5b. Rotate the crankshaft until the timing mark on
the larger gear points to the 7:30 position.
5c. Insert the balance shaft, aligning the timing
marks. See Figure 10.22.
NOTE: The timing marks were marked with red
paint for the picture.
6. Install the valve tappets.
7. Install the cam shaft by:
7a. Pre-lube the cam shaft with clean 10W-30
motor oil
7b. Rotate the crank shaft until the timing mark
points to the tappets.
7c. Insert the cam shaft, aligning the timing
marks. See Figure 10.23.
8. Place a new gasket on the crankcase cover, let the
alignment dowels hold it in place.
9. Using a seal protector, slide the crankcase cover on
to the crank shaft.
10. Gently rock the crank case cover while rotating the
crankshaft until it seats fully against the cylinder
block.
11. Install the crankcase cover bolts and tighten to a
torque of 80 - 106 in-lbs (9 - 12 Nm).
NOTE: Use a star torque pattern to tighten the
cover bolts.
12. Install the cylinder head by following the steps described in Chapter 9: Cylinder head.
13. Install the muffler by following the steps described in Chapter 8: Exhaust.
14. Install the carburetor by following the steps described in Chapter 3: Air Intake and Filters.
15. Install the dipstick and tube.
16. Install the flywheel and module by following the steps described in Chapter 7: Ignition system.
17. Install the starter by following the steps described in Chapter 6: Starter and Charging Systems.
18. Install the blower/air filter housing by following the procedures described in Chapter 3: Air Intake and Filters.
19. Install the engine on the application by following the steps described in the application's service manual.
20. Install the spark plug by following the steps described in Chapter 7: Ignition system.
21. Fill the engine with oil and fuel by following the steps described in Chapter 1: Introduction.
22. Test run the engine in a safe area and make any carburetor and governor adjustments needed.
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Timing marks
Figure 10.22
Timing marks
Figure 10.23