Changing the valve guides

Changing the valve guides

1. Using puller tool no. 1.821.176.000 (A.3.0641), remove the worn valve guides.

• Check that the outside diameter of the valve guides and their seats on the head are within the specified limits and that their assembly interference is correct.

1. Insert the new valve guides using tool no. 1.821.254.000.

• Bore the valve guide inside-diameter to calibrate the holes to the specified diameter.

Checking the valve springs

• Check that the "free" length of the valve springs is within the specified limits.

NOTE: The rest surfaces must be parallel with each other and perpendicular to the axis of the spring with a maximum error of 2°.

1. Using a torque meter, check that the characteristic data of the springs are within the specified limits.