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Testing & Adjusting Injector Adjustment

This technical document provides instructions for adjusting injectors on an SAA6D170 - HPI engine. The adjustment process involves several steps: 1) Setting the engine to top dead center for the cylinder being adjusted, 2) Tightening the adjustment screw in several steps, 3) Securing the screw and tightening the locknut, 4) Repeating for each cylinder based on firing order, 5) Checking lift with a dial gauge and readjusting if needed. The goal is to ensure the plunger remains sealed during combustion without mechanical crush.

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498 views10 pages

Testing & Adjusting Injector Adjustment

This technical document provides instructions for adjusting injectors on an SAA6D170 - HPI engine. The adjustment process involves several steps: 1) Setting the engine to top dead center for the cylinder being adjusted, 2) Tightening the adjustment screw in several steps, 3) Securing the screw and tightening the locknut, 4) Repeating for each cylinder based on firing order, 5) Checking lift with a dial gauge and readjusting if needed. The goal is to ensure the plunger remains sealed during combustion without mechanical crush.

Uploaded by

ROnggosutedJO
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Technical Presentation Kit

SAA6D170 -HPI

Engines

Testing & Adjusting


Injector Adjustment

KT9000101
Feb 2001

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Mechanical Crush

SAA6D170 - HPI
TPK
02/01
Page 4-2
4-2

The goal of Injector


adjustment is to ensure that
the plunger remains sealed in
the nozzle during combustion.

As all of the timing fuel


spills from the chamber,
the plungers will make
mechanical contact. The
downward travel of the
injector train will continue
creating a mechanical
crush condition on the
lower plunger.
KT9000101 - Testing & Adjusting

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Injector Adjustment

SAA6D170 - HPI
TPK
02/01
Page 4-3
4-3

Adjustment of the injector can be carried out at the same


time as Valve Adjustment.
1) Crank the crankshaft with barring device, align 1.6 TOP on
damper with pointer, and set No. 1 cylinder to compression
top dead center. Watch the movement of the rocker arm to
check that the No. 1 cylinder is in the compression stroke.
(If the rocker arm has a play of only
the amount of the valve clearance,
the cylinder is in the compression
stroke.) The cylinder set to
compression top dead center and
the cylinder where the injector is
adjusted are different, so check the
table below when carrying out the
work.

KT9000101 - Testing & Adjusting

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SAA6D170 - HPI
TPK
02/01
Page 4-4
4-4

Injector Adjustment
Timing Marks

Barring tool

KT9000101 - Testing & Adjusting

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Injector Adjustment

SAA6D170 - HPI
TPK
02/01
Page 4-5
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2) Tighten by hand adjustment screw of injector to be


adjusted.
Check that the ball of the push rod is fitted securely in the
socket at the tip of the rocker arm for each injector and
push rod.
3) Repeat the tightening and loosening of the adjustment
screw, then tighten finally.
Adjustment screw:
1st step : 29.4 34.3 Nm {3.0 3.5 kgm}
2nd step: Loosen completely
3rd step : 29.4 34.3 Nm {3.0 3.5 kgm}
4th step : Loosen completely
5th step : 29.4 34.3 Nm {3.0 3.5 kgm}
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Injector Adjustment

SAA6D170 - HPI
TPK
02/01
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4) Secure adjustment screw and tighten lock-nut.


Locknut: 205.8 245 Nm {21 25 kgm}

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5) Crank the crankshaft 120 each time in the normal


direction and repeat Steps (1) (4) to adjust each injector
according to the firing order.
6) After adjusting all the injectors, repeat Step (1) to set the
No. 1 cylinder to compression top dead center. The
cylinder set to compression top dead center and the
cylinder where the injector is to be inspected are different,
so check the table below when carrying out the adjustment.

KT9000101 - Testing & Adjusting

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Injector Adjustment

SAA6D170 - HPI
TPK
02/01
Page 4-8
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7) Set dial gauge to the head of the plunger of the injector to


be checked. Use a dial gauge with a stroke of at least
30 mm.

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SAA6D170 - HPI
TPK
02/01
Page 4-9
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Injector Adjustment

8) Crank the crankshaft and


measure lift C of of the dial
gauge is the maximum.

Maximum lift c: 20.00


mm
If the measurement is not

within the standard


value, adjust the injector
again.
9) Repeat Steps (6) (8) to check the injectors of each
cylinder.

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Komatsu Asia & Pacific Training Centre

KT9000101 - Testing & Adjusting

SAA6D170 - HPI
TPK
02/01
Page 4-10
4-10

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