3
50 Workshop Manual, TSD3450E, Issue 1
2800
How to set the backlash for the camshaft gear Operation 3-11
If the cylinder head or the camshaft is removed, the backlash between the camshaft gear (A1) and the
adjustable idler gear (A2) must be checked and, if necessary, adjusted. The backlash between the camshaft
gear and the adjustable idler gear, and also between the adjustable idler gear (A2) and the main idler gear
(A3), must be 0,25 +/- 0,08 mm (0.010 +/- 0.003 in).
Note: This procedure must be performed before the rocker lever and shaft assemblies are fitted.
1 Remove the main idler gear (A3). Hold the camshaft gear stationary and use a dial test indicator (DTI),
mounted on the gear case, to check the backlash of the adjustable idler gear.
2 Fit the main idler gear (A3), hold the main idler gear stationary and measure the backlash on the adjustable
idler gear.
3 To adjust the backlash, remove the three bolts and thrust plate which retain the adjustable idler gear (A2)
and remove the gear. Loosen the five nuts (B3) and the bolt (B1) which retain the stub axle (B2) and move the
stub axle by the relevant amount. Tighten the nuts and bolt to a torque of 47 +/- 9 Nm (35 +/- 7 lbf ft).
4 Fit the idler gear. Retain with the thrust plate and three bolts. Check again the backlash between the
adjustable idler gear and the camshaft gear, and also between the adjustable idler gear (A2) and the main idler
gear (A3), as given in steps 1 and 2. Repeat the procedure if necessary until the correct backlash settings have
been obtained.
5 When the correct backlash settings have been obtained, remove the adjustable idler gear and proceed as
follows: Remove one of the nuts which retains the idler axle, apply a small amount of Loctite 542 to the threads
of the stud, fit the nut and tighten to a torque of 47 +/- 9 Nm (35 +/- 7 lbf ft). Repeat this procedure for the other
four nuts and the bolt; work on one nut or bolt at a time so that the position of the stub axle is not affected.
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