Special Bulletin
Revision _:

SP16-301
Date

Expiration

Release

Page

02.2016

02.2018

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This document supersedes previous revisions.

VARIABLE GEOMETRY TURBOCHARGER (SRA) - ACTUATOR REPLACEMENT

Prevost vehicles
DESCRIPTION
On the vehicles affected by this bulletin, replace the turbocharger actuator (SRA).

MODEL YEAR(S) AND VEHICLES INVOLVED
NOTICE TO SERVICE CENTERS
Verify vehicle eligibility by checking warranty bulletin status with SAP or via ONLINE WARRANTY
SYSTEM available on Service / Warranty tab of Prevost website.
Model
X3-45 Commuter
Model Year : 2012

VIN
From 2PCG33495CC735053 up to 2PCG33495CC735232 incl.

This bulletin does not necessarily apply to all the above-mentioned vehicles, some vehicles may have been modified
before delivery. The owners of the vehicles affected by this bulletin will be advised by a letter indicating the Vehicle
Identification Number (VIN) of each vehicle concerned.

MATERIAL NEEDED
Order kit “SP16-301” which consists in:
Part No.
85013731

Description
ACTUATOR, TURBOCHARGER – SERVICE KIT

Qty
1

NOTE
Material can be obtained through regular channels.

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Special Bulletin

SP16-301
Date

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Release

Page

02.2016

02.2018

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PROCEDURE

DANGER
Park vehicle safely, apply parking brake, stop engine. Prior to working on the vehicle, set the ignition
switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter
type vehicles, set the battery master switch (master cut-out) to the OFF position.

PREPARATION
1. Apply the parking brake and shift the
transmission to neutral. Shut off all electrical
loads. Turn the ignition key to the OFF
position.

2. Open the engine compartment door. Set the
rear start selector switch to the OFF position
(FIGURE 1).

FIGURE 1

3. Using pressure wash equipment, clean the turbocharger actuator while it is still mounted.
Note: Make sure all electrical connections and coolant pipes in the area of the turbocharger actuator are
securely fastened.

4. Use a coolant extractor (FIGURE 2) to drain the
coolant from the engine. An alternate method
is to drain the coolant into a suitable container
using the drain hose.

FIGURE 2

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Date

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02.2016

02.2018

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GAINING ACCESS TO THE AREA
5. In order to reach the turbocharger area, the
radiator coolant return pipe shown on FIGURE 3
along with the furthest flexible hose must be
removed.

FIGURE 3

6. Loosen the hose clamps (4 clamps) shown on
FIGURE 4.
7. Remove the two (2) U‐clamps shown on
FIGURE 4.
8. Take the pipe out and the flexible hose with it.

FIGURE 4

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Date

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Page

02.2016

02.2018

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REMOVAL
9. Disconnect the actuator assembly electrical
connector at the wiring harness (FIGURE 5).
Cut any tie straps as needed.

FIGURE 5

10. Disconnect the coolant lines from the actuator
(FIGURE 6).

Caution: Protect the insides of the actuator
assembly
and
the
exposed
parts
from
contamination when removed. Failure to do so can
result in component malfunction or failure.

FIGURE 6

1) Coolant Return Port
2) Coolant Inlet Port

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11. Remove the actuator from the turbocharger.
Remove and discard the gasket (FIGURE 7).

FIGURE 7

1) Alignment Pin
2) Actuator Housing
3) Gasket
4) Screw (4 Required)
5) Grease Applicator Tube

INSTALLATION
12. Using gloves, manually rotate the turbocharger
sector gear back and forth (counterclockwise
and clockwise) (FIGURE 8). It should be noted
that when the sector gear is at the end of
travel, or at an end stop, it can require
significant force to overcome friction then, start
its motion in the opposite direction. This is
normal and not cause for concern. Apply more
force to move the sector gear. Once in motion,
the sector gear movement should be smooth,
without binding or sticking until it reaches its
end of travel (end stop).

FIGURE 8

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02.2016

02.2018

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13. Rotate the sector gear fully counterclockwise
until contact is made with the end stop of the
variable geometry internal mechanism. 1/4 to
3/4 of the 3mm (0.118 inch) reference hole
should be visible at the edge of the sector gear
nearest the turbine housing (FIGURE 9).

FIGURE 9
ALIGNMENT HOLE INSPECTION, 3MM (0.118 INCH) HOLE

14. For turbochargers manufactured without the
small 3mm (0.118 inch) alignment hole, a
portion (half) of the 5mm (0.197 inch)
alignment hole should be exposed at the
compressor housing side of the sector gear
when the sector gear is fully rotated toward the
turbine housing (FIGURE 10).

FIGURE 10
ALIGNMENT HOLE INSPECTION, 5MM (0.197 INCH) HOLE

15. Rotate the sector gear fully clockwise. Make
sure that the alignment pin fits through the
sector gear into the alignment hole in the