Checking The Valve; Checking The Valve Guide - SELVA MARINE Wahoo 15 Service Manual

POWR

Checking the valve

1. Check the valve face. Replace the valve
if pitted or worn.
2. Measure the valve margin thickness a.
Replace the valve if out of specification.
Valve margin thickness a:
Intake:
0.8–1.2 mm (0.0315–0.0472 in)
Exhaust:
1.0–1.4 mm (0.0394–0.0551 in)
3. Measure the valve stem diameter b.
Replace the valve if out of specification.
Valve stem diameter b:
Intake:
5.475–5.490 mm
(0.2156–0.2161 in)
Exhaust:
5.460–5.475 mm
(0.2150–0.2156 in)
4. Measure the valve stem runout. Replace
the valve if above specification.
5-39
Power unit
5
Valve stem runout limit:
0.01 mm (0.0004 in)

Checking the valve guide

NOTE:
Before checking a valve guide, make sure
that the valve stem diameter is within specifi-
cation.
1. Measure the valve guide inside diameter
a.
Valve guide inside diameter a:
Intake and exhaust:
5.500–5.512 mm
(0.2165–0.2170 in)
2. Calculate the valve-stem-to-valve-guide
clearance as follows. Replace the valve
guide if out of specification.
5
6AG3J11