Timing idler gear
Use a magnetic base dial gauge to check for correct tooth ba-
cklash between idler, engine gear and timing gear.
This backlash should not exceed 0.10 mm; otherwise the idler
gear should be replaced by another one having the same thi-
ckness as the tooth located on the different pitch diameter, so that
a correct tooth backlash may be established.
Identification among gears is provided with marks of different
colours (either RED or YELLOW or GREEN) as illustrated in figure
11.
To each colour corresponds a well-defined tooth thickness value.
tooth thickness on the pitch diameter
ref. code 007.1177.0 RED colour
= 3.829
− 0.044
− 0.088
ref. code 007.1178.0 YELLOW colour
= 3.829
− 0.053
− 0.009
ref. code 007.1179.0 GREEN colour
= 3.829
− 0.026
− 0.018
Fig. 13 - Timing gear.
Fig. 11 - Timing idler gear.
A - Identification mark
Fig. 12 - Gear toothing.
B - Gear tooth thickness
engine
cylinder block
B - Cranshaft driving gear
C - Timing driving gear
A - Idler gear
11
1
25
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