Removing The Injection Valve; Installing The Injection Valve - Stihl MS 500i Service Manual

WARNING
The fuel hose (3) and fuel return hose may be damaged
during removal. Fuel may escape.
Install a new fuel hose and fuel return hose.
A replacement injection module (12 and 8) comes with a
new fuel hose and new fuel return hose.
Push the fuel hose onto elbow connector of injection
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module (12 and 8) as far as stop, @ 20.5.
Push the fuel return hose onto elbow connector of
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injection module (12 and 8) as far as stop, @ 20.7.
Install the airflow shroud (4), @ 25.5.
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Test the fuel system for leaks and correct operation,
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@ 4.
Calibrate the saw, @ 4.
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The controller is optimally adjusted to suit the mechanical
and mechatronic components.

25.10 Removing the Injection Valve

The injection valve (8) can be removed without removing
the injection body (12).
Preparations, @ 3.1.
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Remove the airflow shroud (4), @ 25.2.
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Remove cable lug of sensor's red wire, @ 22.3.
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Remove the contact strip (11), @ 25.6.
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If necessary: Remove the injection module (12 and
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8), @ 25.8.
The injection valve (8) may be damaged during removal if
screw (9) and the cable lug's screw on the injection valve
are not removed.
Take out the screw (9) and cable lug's screw on the
injection valve before removing the injection valve (8).
If the injection module (12 and 8) has been removed:
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Use a 5 mm pin punch to carefully push the injection
valve (8) out of the injection body (12).
If the injection module (12 and 8) has not been
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removed: Pull out the injection valve (8).
7
8
The sleeve (7) may remain on the injection valve (8) or get
stuck in the injection body (12) during removal.
MS 500i
12
7
The sleeve (7) or the injection valve (8) may be damaged
if the sleeve (7) is stuck in the injection body (12) and an
injection valve (8) with a new sleeve (7) is installed.
If the sleeve (7) is stuck in the injection body:(12): apply
hook 5910 890 2800 to recess (arrow) in injection body
(12) and pull out the sleeve.
If the sleeve (7) is still on the injection valve (8): Remove
the sleeve (7).
If the O-rings on the injection valve are damaged: Install
new O-rings on injection valve (8).
If the injection valve (8) is damaged: Install a new injection
valve (8).
Install a new sleeve (7).
Engine running behavior can be detrimentally affected If
the sleeve (7) is missing and the injection valve (8) is
installed without the sleeve.
Install a new sleeve (7).

25.11 Installing the Injection Valve

7
8
The sleeve (7) may remain on the injection valve (8) or get
stuck in the injection body (12) during removal.
Engine running behavior can be detrimentally affected If
the sleeve (7) is missing and the injection valve (8) is
installed without the sleeve.
Install a new sleeve (7).
The sleeve (7) or the injection valve (8) may be damaged
if the sleeve (7) is stuck in the injection body (12) and an
injection valve (8) with a new sleeve (7) is installed.
If the sleeve (7) is stuck in the injection body:(12): apply
hook 5910 890 2800 to recess (arrow) in injection body
(12) and pull out the sleeve.
If the sleeve (7) is still on the injection valve (8): Remove
the sleeve (7).
If the O-rings on the injection valve are damaged: Install
new O-rings on injection valve (8).
12
7
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