Turning the valve seats

Turning the valve seats

• If necessary, turn the valve seats using suitable equipment.

• After machining, grind each valve in its seat as follows:

• coat the contact surfaces "A" and "B" of the valves and their seats with abrasive paste (SIPAL AREXONS Carbosilicium for valves);
• lubricate the valve stem with engine oil;
• fit the lower surface of the valve mushroom to the suction cup "C" of a pneumatic grinder;
• insert the valve in its guide and grind;
• after grinding, thoroughly clean the valve and the seat.

Checking the clearance between rockers and support shaft

1. Check that the inside diameter of the rockers is within the specified limits.

Inside diameter of rockers
16.010 ÷ 16.028 mm

1. Check that the diameter of the rocker shaft is within the specified limits.

Diameter of rocker support shaft
15.988 ÷ 16.000 mm

• Calculate the clearance between rockers and support shaft checking that it is within the specified limits.

Clearance between rockers and support shaft
0.010 ÷ 0.040 mm