TOHATSU MFS 8B Service Manual page 131

12. Compress valve spring
valve spring compressor
remove spring and valve
· Valves, springs and other related parts
should be arranged in the order they are
removed.
· Use attachment with inner diameter of
23.5mm.
· If valve spring compressor is not used, put
cylinder head on the folded rag to prevent
valves from being damaged.
13. Remove stem seal .
1. Measure valve spring free length
less than specified value.
Valve Spring Free Length
38.3 mm (1.51 in)
Functional Limit :
38.6 mm (1.45 in)
1. Check valve for dent and wear on the face. Replace if
necessary.
2. Measure valve stem outer diameter
than specified value.
Valve Stem Outer Diameter
Intake Side
Exhaust Side : 5.46 mm (0.2150 in)
Functional Limit :
Intake Side
Exhaust Side : 5.44 mm (0.2142 in)
Before inspecting valve guide, check that valve
stem outer diameter is within specified limit.
1. Measure valve guide inner diameter
head if the inner diameter is over specified value.
Valve Guide Inner Diameter
Intake/Exhaust Side : 5.51 mm (0.2169 in)
Functional Limit :
Intake Side
Exhaust Side : 5.57 mm (0.2193 in)
4st 8/9.8 2016
using a commercially available
, remove cotters , and then,
.
. Replace if the length is
: Standard Value
. Replace if it is less
: Standard Value
: 5.48 mm (0.2157 in)
: 5.46 mm (0.2150 in)
. Replace cylinder
: Standard Value
: 5.55 mm (0.2185 in)
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