ENGINE TOP END
3-5-23
B
D
E
◆
Measure the free length of each valve spring with a
Vernier caliper and compare to specifi cation.
◆
Valve Spring Free Length: Standard: 1.726" (43.85
mm)Service Limit: 1.683" (42.75 mm)
Standard Service Limit
42.5 mm (1.6732")
41.4mm (1.6299")
Valve Guide / Valve Inspection
Valve Guide / Valve Inspection
◆
Valve-to-Guide Clearance Measurement:
If a small bore gauge is not available, inspect the valve
guide wear by measuring the valve to valve guide
clearance with the wobble method as indicated below.
◆
Insert a new valve
【
A
】
into the guide
【
B
】
and
set a dial gauge against the stem perpendicular to
it as close as possible to the cylinder head mating
surface.
◆
Move
【
C
】
the stem back and forth to measure
valve/valve guide clearance.
◆
Repeat the measurement in a direction at a right
angle to the fi rst.
If the reading exceeds the service limit, replace the
Cylinder head &
Camshaft Carrier
Combination.
NOTE
The reading is not actual valve/valve guide clearance
because the measuring point is above the guide.
Valve/Valve Guide Clearance (Wobble Method)
Standard Service Limit
Exhaust:
0.09 ~ 0.17 mm
(0.0035" ~ 0.0067")
0.34 mm
0.0133"
Inlet:
0.03 ~ 0.11 mm
(0.0012" ~ 0.0043")
0.28 mm
0.0110"
◆
Check valve face for runout, pitting, and burnt spots.
To check for bent valve stems, mount valve in a drill
or use “V” blocks and a dial indicator.
◆
Check the end of the valve stem for fl aring, pitting,
wear or damage.
◆
Inspect split keeper groove for wear or fl aring in the
keeper seat area.
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