Valve, Valve Guide

VALVE, VALVE GUIDE





1. Measure the valve head margin thickness. Replace the valve if necessary

Margin thickness
IN:
1.0 mm (0.039 in) min. (B6)
1.350 mm (0.053 in) min. (BP)
EX:
1.0 mm (0.039 in) min. (B6)
1.475 mm (0.058 in) min. (BP)





2. Measure the valve length. Replace the valve if necessary.

Length








3. Measure the valve stem diameter of each valve in X and Y directions at the three points (A, B, and C) shown. Replace the valve if necessary.

Diameter
IN
Standard: 5.970-5.985 mm (0.2351-0.2356 in)
Minimum: 5.920 mm (0.2331 in)
EX
Standard: 5.965-5.980 mm (0.2349-0.2354 in)
Minimum: 5.915 mm (0.2329 in)





4. Measure the inner diameter of each valve guide in X and Y directions at the three points (A, B, and C) shown. Replace the valve guide if necessary.

Inner diameter:
6.01-6.03 mm (0.2367-0.2374 in)
6.02-6.04 mm (0.2371-0.2377 in) (Service parts)

5. Calculate the valve stem-to-valve guide clearance. Subtract the outer diameter of the valve stem from the inner diameter of the corresponding valve guide.





Clearance
IN:
0.025-0.060 mm (0.0010-0.0023 in)
0.035-0.070 mm (0.0014-0.0027 in) (Service parts)
EX:
0.030-0.065 mm (0.0012-0.0025 in)
0.040-0.075 mm (0.0016-0.0029 in) (Service parts)

Maximum: 0.20 mm (0.008 in)

6. If the clearance exceeds the specification, replace the valve and/or valve guide.
7. Measure the protrusion height (dimension (A)) of each valve guide without valve spring seat, low. Replace the valve guide if necessary.

Height:
16.8-17.4 mm (0.662-0.685 in) (B6)
18.3-18.9 mm (0.721-0.744 in) (BP)

Replacement of valve guide





Note
^ Although the shapes of the intake and exhaust valve guides are different, use the exhaust valve guide on both sides as a replacement.

Removal





Using the SST, remove the valve guide from the combustion chamber side.

Installation





1. Assemble the SSTs so that depth L is as specified.

Depth L:
16.8-17.4 mm (0.662-0.685 in) (B6)
18.3-18.9 mm (0.721-0.744 in) (BP)

2. Tighten the nut.
3. Fit the clip onto the valve guide.





4. Using the SST, tap the valve guide in from the side opposite the combustion chamber until the SST contacts the cylinder head.
5. Verify that the valve guide protrusion height is within the specification.