Toro 500 EFI Service Manual page 72

Checking Tooth Contact

NOTE: After correcting backlash of the secondary
driven bevel gear, it is necessary to check tooth con-
tact.
1. Remove the secondary driven output shaft assembly
from the left-side crankcase half.
2. Clean the secondary driven bevel gear teeth of old oil
and grease residue.
3. Apply a thin, even coat of a machinist-layout dye to
several teeth of the gear.
4. Install the secondary driven output shaft assembly.
5. Rotate the secondary driven bevel gear several revo-
lutions in both directions.
6. Examine the tooth contact pattern in the dye and
compare the pattern to the illustrations.
70
Correcting Tooth Contact

NOTE: If tooth contact pattern is comparable to the
correct pattern illustration, no correction is neces-
sary.
If tooth contact pattern is comparable to an incorrect
pattern, correct tooth contact according to the follow-
ing chart.
Tooth Contact
Contacts at Top
Contacts at Root

NOTE: To correct tooth contact, steps 1 and 2 (with
NOTE) of "Correcting Backlash" must be followed
and the above "Tooth Contact/Shim Correction" chart
must be consulted.
After correcting tooth contact, backlash must again be
checked and corrected (if necessary). Continue the cor-
recting backlash/correcting tooth contact procedures
until they are both within tolerance values.
CRANKSHAFT ASSEMBLY

NOTE: The crankshaft and connecting rod is a non-
serviceable assembly. If any component is out of
specification, the assembly must be replaced.
Measuring Connecting Rod
(Small End Inside Diameter)
ATV-0103
1. Insert a snap gauge into the upper connecting rod
small end bore; then remove the gauge and measure
it with micrometer.
ATV-0105
2. Maximum diameter must not exceed specifications.
Measuring Connecting Rod
(Small End Deflection)
1. Place the crankshaft on a set of V-blocks and mount
a dial indicator and base on the surface plate. Posi-
tion the indicator contact point against the center of
the connecting rod small end journal.
2. Zero the indicator and push the small end of the con-
necting rod away from the dial indicator.
ATV-0104
3. Maximum deflection must not exceed specifications.
Shim Correction
Decrease Shim Thickness
Increase Shim Thickness
CAUTION
CC290D