Valves

Valve Movement

Measure the guide-to-stem clearance with a dial indicator while rocking the stem in the direction of normal thrust (wobble method).

Intake Valve Stem-to-Guide Clearance: Standard (New): 0.04-0.10 mm
(0.002-0.004 in) Service Limit:   0.16 mm (0.006 in)

Exhaust Valve Stem-to-Guide Clearance: Standard (New): 0.10-0.16 mm
(0.004-0.006 in) Service Limit:   0.22 mm (0.009 in)

•   If measurement exceeds the service limit, recheck using a new valve.
•   If measurement is now within the service limit, reassemble using a new valve.
•   If measurement still exceeds limit, recheck using alternate method below, then replace valve and guide, if necessary.

NOTE: An alternate method of checking guide to stem clearance is to subtract the O.D. of the valve stem, measured with a micrometer, from the I. D. of the valve guide, measured with an inside micrometer or ball gauge. Take. the measurements in three places along the valve stem and three places inside the valve guide. The difference between the largest guide measurement and the smallest stem measurement should not exceed the service limit.
Intake Valve Stem-to-Guide Clearance: Standard (New): 0.020-0.050 mm
(0.001-0.002 in) Service Limit:   0.080 mm (0.003 in)

Exhaust Valve Stem-to-Guide Clearance: Standard (New): 0.05-0.08 mm
(0.002-0.003 in) Service Limit:   0.11 mm (0.004 in)

Cylinder Head

Warpage

NOTE: If the camshaft bearing clearances (page 6-41) are not within specification, the head cannot be resurfaced.

If the camshaft bearing radial clearances are within specifications, check the head for warpage.

•   If warpage is less than 0.05 mm (0.002 in)
•   If warpage is between 0.05 mm (0.002 in) and
0.2 mm (0.008 in), resurface cylinder head.
•   Maximum resurface limit is 0.2 mm (0.008 in)
based on a height of 93 mm (3.66 in).

Measure along edges, and 3 ways across center.

Cylinder Head Height:
D15Z1, D16Z6 engine:
Standard (New): 92.95-93.05 mm
(3.6594-3.6634 in) Service Limit:   0.05 mm (0.002 in)
D15137,   D15138 engine:
Standard (New): 94.95-95.05 mm
(3.7382-3.7421 in) Service Limit:   0.05 mm (0.002 in)