Keep the lip free from foreign matter

(a) Using a 45° cutter, resurface the valve seat so that the valve seat width is more than the specification.

(b) Using 30° and 75° cutters, correct the valve seat so that the valve contacts the entire circumference of the seat. The contact should be in the center of the valve seat, and the valve seat width should be maintained within the specified range around the entire circumference of the seat. Valve Seat Width

Item

Specified Condition

Intake Side

1.0 to 1.4 mm (0.039 to 0.055 in.)

Exhaust Side

1.2 to 1.6 mm (0.047 to 0.063 in.)

(c) Handrub the valve and valve seat with an abrasive compound.

(d) Check the valve seating position.

5. INSPECT CAMSHAFT THRUST CLEARANCE

(a) Install the camshafts (See page EM-70).

(b) Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth. Standard thrust clearance

Item

Specified Condition

Intake

0.040 to 0.095 mm (0.0016 to 0.0037 in.)

Exhaust

0.080 to 0.135 mm (0.0032 to 0.0053 in.)

Maximum thrust clearance

Item

Specified Condition

Intake

0.110 mm (0.0043 in.)

Exhaust

0.150 mm (0.0059 in.)

If the thrust clearance is greater than the maximum, replace the cylinder head. If the thrust surface is damaged, replace the camshaft.

6. INSPECT CAMSHAFT OIL CLEARANCE

(a) Clean the bearing caps and camshaft journals.

(b) Place the camshafts on the cylinder head.

(c) Lay a strip of Plastigage across each of the camshaft journals.

(d) Install the bearing caps (See page EM-70). NOTICE:

Do not turn the camshaft.

(e) Remove the bearing caps (See page EM-53).

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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