Precision Airmotive SIL RS-82 Service Information Letter

Service Information
Letter - Fuel Systems

SUBJECT: Cleaning of Contaminated Fuel Injection Systems

PURPOSE:

To provide additional information regarding inspecting and cleaning fuel injection
systems that may have been exposed to possible contamination.
A) EFFECTIVITY: This service Information Letter is applicable to RSA fuel injection
B) DESCRIPTION: Precision Airmotive LLC has learned of situations where the fuel injection
C)

PROCEDURE:

1) SERVO: The fuel injection servo shall be completely disassembled, including all
subassemblies that have contact with fuel, inspected, cleaned and damaged parts, if any,
replaced. In doing so, ensure as follows:
a. When cleaning the main body of the servo ensure that ALL fuel passageways,
b. The diaphragms must be gently flexed where the rubber meets the metal washer
c. The mixture control lever assembly and idle lever assembly can also house
d. The servo seat must be removed to inspect the passages underneath.
e. Carefully inspect 90° fittings and internal passages where two passages meet.
f. Any part with questionable wear or any evidence of damage must be replaced.
After inspecting and cleaning, the servo shall be reassembled and calibrated per the
applicable service manual (See 15-895) using the calibration limits (not service limits).
systems.
system has been contaminated with foreign objects, including from
contaminated fuel and during maintenance/installation. Contamination can
have adverse affects on the performance of the engine, including the
servo, and must be eliminated. This SIL provides instructions for
inspecting and cleaning systems with suspected contamination.
The following are guidelines for inspecting and cleaning fuel injection
systems when it is suspected that the system may have been exposed to
possible contamination.
including the UN-metered passageways, are cleaned, flushed, and unobstructed.
ALL fuel plugs and fittings must be removed to allow inspection of each
passageway.
to look for hidden contamination. Also, carefully check the diaphragms for
damage caused by contaminates. If there is any question about the condition of
the diaphragm, it should be replaced.
hidden contaminates because of the number and type of parts that are
assembled. Carefully inspect each part after complete disassembly.
This is an area where contaminates can be trapped.
SIL RS-82
SMALL RECIPROCATING ENGINES
All RSA
Issued 12/12/06
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