Mitsubishi S6R Series User Manual

6-9
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
1.11 Squareness and Free Length of Valve Spring - Measure
Measure the squareness and free length of valve spring. If
the free length or squareness exceeds the limit, replace the
valve spring with a new one.
Squareness and Free Length of Spring - Measure
Spring squareness
Free length
Item Standard value Limit value
Single valve spring
P/N:
37504-10400
Free length 73 mm [2.87 in.] 71 mm [2.80 in.]
Squareness
A=1.5° or less
B=1.9 mm [0.075 in.] or less
Lf=73 mm [2.87 in.]
At full length
B=2.2 mm [0.087 in.]
Set length / load
66.0 mm [2.598 in.] / 289 to 319 N {29.45 to 32.55
kgf} [64.97 to 71.71 lbf]
-
Double valve spring
Inner spring
P/N:
37504-10600
Free length 90.6 mm [3.567 in.] 88.12 mm [3.4693 in.]
Squareness
A=2.0°or less
B=3.2 mm [0.126 in.] or less
Lf=90.6 mm [3.567 in.]
At full length
B=3.7 mm [0.146 in.]
Set length / load
56.0 mm / 137 to 152 N {14 to 15.5 kgf} [30.80 to
34.17 lbf]
-
Outer spring
P/N:
37504-20500
Free length 96.57 mm [3.8020 in.] 93.92 mm [3.6976 in.]
Squareness
A=2.5°or less
B=4.2 mm [0.165 in.] or less
Lf=96.57 mm [3.8020 in.]
At full length
B=4.2 mm [0.165 in.]
Set length / load
62.0 mm / 496 to 549 N {50.6 to 56.0 kgf} [111.51
to 123.42 lbf]
-
A
B
Lf
A
B
Lf
A
B
Lf

Mitsubishi S6R Series Specifications

General

Brand	Mitsubishi
Model	S6R Series
Category	Engine
Language	English