Inspection Of Valve Spring - TOHATSU MFS25 Service Manual

Power Unit
Compress valve spring 4 by using compressor 6, remove
9.
cotter, and then, spring and valve.
Valves, springs and other related parts should
be arranged in the order they are removed.
Valve Spring Compressor 6 :
P/N. 3AC-99075-0

9) Inspection of Valve Spring

Measure valve spring free length a. Replace if the length is
1.
less than specified value.
Valve Spring Free Length a : Standard Value
35.0 mm ( 1.38 in )
Functional Limit :
33.5 mm ( 1.32 in )
Measure valve spring inclination b. Replace if the angle is
2.
over specified value.
Valve Spring Inclination Limit b :
2.0 mm ( 0.08 in )
5-32
6
a
b
8
4
9
25/30 2006