Squareness And Free Length Of Valve Spring - Measure; Tappet - Inspect; Push Rod Runout - Measure; Nozzle Gland Stud Bolt And Bridge Guide - Inspect And Replace - Mitsubishi S12A2 Service Manual

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.
Nominal Standard value
value
Free length 67.5 mm [2.66 in.]
A
A=1.5°
B
Squareness B=1.76 mm [0.069 in.]
Lf
Lf=67.5 mm [2.66 in.]
60.0 mm [2.36 in.]/259 to 286 N
Set length /
{26.41 to 29.16 kgf} [375.64 to 414.75
load
psi]

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.

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.
Item Standard value
Push rod runout 0.50 mm [0.020 in.] or less

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.
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
Limit value
66.2 mm
[2.61 in.]
At full
length
B= 2.3 mm
[0.09 in.]
Squareness and Free Length of Spring - Measure
-
Flaw, local wear
Remarks
TIR
Nozzle ground
stud
Nozzle Gland Stud Bolt and Bridge Guide -
Spring squareness
Free length
Flaw, local wear
Good Bad
Tappet Sliding Face to Cam - Inspect
V-block
1/2 1/2
Surface plate
Push rod Runout - Measure
Approx.84 mm
[3.31 in.]
Install
Bad
Push rod
Bridge guide
37 mm
(48 mm
[1.89 in.]) [1.46 in.]
6-9