TOHATSU MFS 2 Service Manual

5-30
Power Unit
4st 2/2.5/3.5 2007
33) Inspection of Valve Guide
1. Measure valve guide inner diameter b. Replace cylinder
block if it is over specified value.
Valve Guide Inner Diameter b : Standard value
Intake and Exhaust Sides : 5.51 mm (0.2169 in)
Functional Limit :
Intake Side (IT) : 5.55 mm (0.02185 in)
Exhaust Side (E) : 5.57 mm (0.02193 in)
b
2. Obtain clearance between valve guide and valve stem by
calculating as described below. Replace cylinder head
and/or valve if the clearance is over specified value.
Clearance between Valve Guide and Valve Stem =
Valve Guide Inner Diameter b - Valve Stem Outer Diameter a :
Intake
Side (IT) : 0.018 - 0.045 mm (0.00071 - 0.00177 in)
Exhaust Side (E) : 0.025 - 0.052 mm (0.00098 - 0.00205 in)
Functional Limit
Intake Side (IT) : 0.070 mm (0.00276 in)
Exhaust Side (E) : 0.080 mm (0.00315 in)
a
Before inspecting valve guide, check that valve
stem outer diameter is within specified range.
3. Measure valve stem runout. Replace if it is over specified
value.
Valve Stem Runout Limit :
Intake Side (IT) : 0.05 mm (0.0020 in)
Exhaust Side (E) : 0.03 mm (0.0012 in)
32) Inspection of Valve
1. Check valve for dent and wear on the face. Replace if
necessary.
2. Measure valve stem outer diameter a. Replace if it is less
than specified value.
a
Valve Stem Outer Diameter a : Standard value
Intake Side (IT) : 5.47 mm (0.2154 in)
Exhaust Side (E) : 5.46 mm (0.2150 in)
Functional Limit :
Intake Side (IT) : 5.45 mm (0.2146 in)
Exhaust Side (E) : 5.44 mm (0.2142 in)
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TOHATSU MFS 2 Specifications

General

Brand	TOHATSU
Model	MFS 2
Category	Engine
Language	English