Toro 500 EFI Service Manual page 90

9. Loosely install the five cylinder head nuts.
10. Using a crisscross pattern, tighten the four cap screws
(from step 8) initially to 20 ft-lb; then in 10 ft-lb incre-
ments, tighten to a final torque of 40 ft-lb.
11. Tighten the 8 mm nuts from step 9 to 18 ft-lb and the 6
mm nuts to 8 ft-lb; then tighten the two cylinder-to-
crankcase nuts (from step 4) securely.
12. With the timing inspection plug removed and the chain
held tight, rotate the crankshaft until the piston is at top-
dead-center.
13. Install the rear cam chain tensioner guide into the cylin-
der head. Install the pivot cap screw and washer.

NOTE: At this point, oil the camshaft journals, cam
lobes, and the three seating surfaces on the cylinder.
14. With the alignment pin installed in the camshaft, loosely
place the cam sprocket (with the recessed side facing the
cam shaft lobes) onto the camshaft. At this point, do not
"seat" the sprocket onto the shaft.
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15. With the cam lobes directed down (toward the pis-
ton), maneuver the camshaft/sprocket assembly
through the chain and towards its seating position;
then loop the chain over the sprocket.

NOTE: Note the position of the alignment marks on
the end of the camshaft. They must be parallel with
the valve cover mating surface. If rotating the cam-
shaft and sprocket is necessary for alignment, do not
allow the crankshaft to rotate and be sure the cam
lobes end up in the down position.
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16. Seat the cam sprocket onto the camshaft making sure
the alignment pin in the camshaft aligns with the
smallest hole in the sprocket; then place the cam-
shaft/sprocket assembly onto the cylinder ensuring
the following.
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A. Piston still at top-dead-center.
B. Camshaft lobes directed down (toward the pis-
ton).
C. Camshaft alignment marks parallel to the valve
cover mating surface.
D. Recessed side of the sprocket directed toward the
cam lobes.
E. Camshaft alignment pin and sprocket alignment
hole (smallest) are aligned.
If any of the above factors are not as stated, go back to
step 12 and carefully proceed.
17. Place the tab-washer onto the sprocket making sure it
covers the pin in the alignment hole.
732-307B
CAUTION
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CF013A