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.The
free length or squareness exceeds the specified limit,
replace a valve spring with a new one.
Squareness and Free Length of Spring - Measure
1.12 Tappet - Inspect
Inspect the tappet sliding face to cam for even wear.If the
surface is defective, replace the tappet with a new one.
Tappet Sliding Face to Cam - Inspect
1.13 Push rod Runout - Measure
Measure the runout of push rod at TIR.If the runout exceeds
the standard, replace the push rod with a new one.
Push rod Runout - Measure
1.14 Nozzle Gland Stud Bolt and Bridge Guide - Inspect and Replace
Inspect the nozzle gland stud bolt for bending or damage at
threaded portion.
Inspect the bridge guide for uneven wear and damage on the
sliding surface.
1.14.1 Nozzle Gland Stud - Install
Tighten the nozzle gland stud bolt until it comes to the bot-
tom end.
1.14.2 Bridge Guide - Install
Press-in the bridge guide to the specified dimension.
Nozzle Gland Stud Bolt and Bridge Guide -
Install
Nominal
value
Standard value
Limit value
Free length 67.5 mm [2.66 in.]
66.2 mm
[2.61 in.]
Squareness
A=1.5°
B=1.76 mm [0.069 in.]
Lf=67.5 mm [2.66 in.]
At full
length
B= 2.3 mm
[0.09 in.]
Set length /
load
60.0 mm [2.36 in.]/259 to 286 N
{26.41 to 29.16 kgf} [375.64 to 414.75
psi]
-
A
B
Lf
Spring squareness
Free length
Good
Bad
Bad
Flaw, local wear
Flaw, local wear
Item Standard value Remarks
Push rod runout 0.50 mm [0.020 in.] or less TIR
1/21/2
Push rod
Surface plate
V-block　
(48 mm
[1.89 in.])
Approx.84 mm
[3.31 in.]
37 mm
[1.46 in.]
Bridge guide
Nozzle ground
stud
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