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78/83/90 Series Horizontal Shaft Engines
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6. Install the balance shaft by:
6a. Pre-lube the balance shaft with clean 10W-30
motor oil
6b. Rotate the crankshaft until the timing mark on
the larger gear points to the 7:30 position.
6c. Insert the balance shaft while aligning the tim-
ing marks. See Figure 10.21.
7. Install the valve tappets.
8. Install the cam shaft by:
8a. Pre-lube the cam shaft with clean 10W-30
motor oil
8b. Rotate the crank shaft until the timing mark
points to the tappets.
8c. Insert the cam shaft while aligning the timing
marks.
See Figure 10.22.
9. Place a new gasket on the crankcase cover, let the
alignment dowels hold it in place.
10. Using a seal protector, slide the crankcase cover on
to the crank shaft.
11. Gently rock the crank case cover while rotating the
crankshaft until it seats fully against the cylinder
block.
12. Install the crank case 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.
13. Install the cylinder head by following the steps described in Chapter 9: Cylinder head.
14. Install the muffler by following the steps described in Chapter 8: Exhaust.
15. Install the fuel tank by following the steps described in Chapter 4: Fuel systems and Governor.
16. Install the carburetor by following the steps described in Chapter 3: Air Intake and Filters.
17. Install the flywheel and module by following the steps described in Chapter 7: Ignition system.
18. Install the blower housing and starter by following the steps described in Chapter 6: Starter and Charging Sys-
tems.
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.
Figure 10.21
Timing marks
Figure 10.22
Timing marks
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