ENGINE, FUEL AND CONTROL, RELEASE OF NEW DESIGN SHAFT
SEAL FOR CECO MODEL MFP 263 and MFP 264 FUEL PUMP
This CEB transmits Chandler Evans Setvice Bulletin 73-l dated December 212. 1995 for incorporation as
directed by Allison.
1. PLANNING INFORMATION:
A. Effectivity:
This bulletin a,ffects Chandler Evans (CECO) Fuel Pumps Models MFP-263 (P/N
113300-OlAl). MFP-264-1 (PIN 11331WlAl) and MFP-264-2 (P/N 11332&01A1) installed
on all Allison Model 250 Series engines.
B. Reason:
To provide for modification of CECO Fuel Pump Models MFP-263. MFP-264-1 and
MFP-264-2 tmoincorporate an improved design main drive shaft seal.
C. Descriotion:
This bulletin provides instructions to change the Allison fuel pump part numbers to the following
new part numbers for the Chandler Evans fuel pumps:
CECO PUMP
MODEL NO. OLD PART NO.
MFP-26:3 23057338 11330&OlAl
MFF-2641 23057339 11331C-O1A1
MFP-264-2 23057340 113320-01 Al
D. Atxxoval:
Technical aspects are FAA approved.
E. Comoliance:
Compliance Code 4: To be complied with the next time the affected module or component is at
an authorized repair/overhaul facility and is disassembled for any reason.
CUSTOMER SUPPORT
ALLISON ENGINE COMPANY
July 31, 1996 25&C18 Series CEB 289
250X20 Series CEB 1343
25O-C28 Series CEB 73-2059
250-C30 Series CEB 73-3077
250-C20R Series CEB 7-035
250-817 Series TP CEB 1296
250-B17F Series TP CEB 73-2018
Page 1 of 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Allison Engine Company
COMMERCIAL ENGINE BULLETIN
THIS PAGE IS INTENTIONALLY LEFT BLANK
July 31, 1996 250-Cl8 Series CEB 289
250X20 Series CEB 1343
25C-C28 Series CEB 73-2059
25W30 Series CEB 73-3077
250-C20R Series CEB 73-4035
250-617 Series TP CEB 1296
250-B17F Series TP CEB 73-2018
Page 2 of 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Control Systems Divislon
Coltec Industries
July 12/96
SERVICE BULLETIN 73-l
CHANDLER EVANS MODEL MFP-263 FlJE:L PUMP
(ALLISON MODEL 250 SERIES I and II___ENGINES)
AND
CHANDLEREVANS- AND MFP-264-2 FUEL PUMPS
(ALLISON MODEL 250 SERIES Ill AND IV ENGINES)
Introduction ofan Improved D&Q~ Drive Sraft Seal
A. Effec_livi@::
Applicable to Chandler Evans models MFP-263 (Part Number 113300.Ol Al), MFP-264-l
(Part Number 113310-OlAl), and MFP-264-2 (Part Numbe’ 113320.OlAl) main fuel
pumps, as, used on the Allison model 250 series I through l’i/ engines
E. Reason:
To install an improved design main drive shaft seal.
C. Descriotio!>:
The work required by this serwce bulletin consists of the removal of a retaining ring and the
main drive shaft, shaft seal, packing and spring located behind it. An improved design shaft
seal together with a new spring, retaining ring and packing are then reassembled with the
drive shaft into the pump.
D. ComolianE:
Compliance should be effected at the earliest maintenance opportunity or upon discovery
of leakage from the drive shaft seal area.
E. Aoproval:
The technical aspects of this bulletin have been approved by the FAA per Allison DER
F. Manoower:
All work, with the exception of pump removal and installation, is to be performed by
Chandler Evans authorized personnel or a Chandler Evans authorized overhaul depot at no
cost to the customer. Approximately 1.0 man-hour is required to replace the shaft seal.
July 31, 1996 250X18 Series CEB 289
25O-CZO Series CEB 1343
25&C28 Series CEB 73-2059
25&X30 Series CEB 73-3077
25&C20R Series CEB 73-4035
250-917 Series TP CEB 1296
250-B17F Series TP CEB 73-2018
Page3ofll
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Con:rol Systems Division
Colrec Industries
Julv 12/96
73-1 SERVICE BULLETIN
G. Material - Price and Availability:
1 Current Unit
Part Number Nomenclature Availability
List Price
,
*. I
SC113955-1 j 1 / Seal, Shaft
/
**
113956-l ! ’ / Spring
I
78172-026 j 1 I Packing, Preformed Immediately
available
M27426-3129D 1 Ring, Retaining Immediately
available
113268-1 1 Plate, Identification i Immediately
available
1
‘Materials provided at no cost
“Contact a Chandler Evans account manager for availability.
H. Toolino Price and AvailabilQ:
Tools required to accomplish this service bulletin will be provided by Chandler Evans
or its authorized overhaul depot.
I. Weiaht and Balance:
None.
J. Electrical Load Data:
Not changed.
K. Reference:
None.
L. Other PublicationS Affected:
Chandler Evans Control Systems Division Model MFP-263 Main Fuel Pump Component
Maintenance Manual 73-10-08, latest revrsron.
Chandler Evans Control Systems Division Model MFP-264-l & MFP-264-2 Main Fuel
Pump Component Maintenance Manual 73-10-08, latest revision.
July 31, 1996 250X18 Series CEB 289
25&C20 Series CEB 1343
250X28 Series CEB 73-2059
250X30 Series CEB 73-3077
25O-C20R Series CEB 73-4035
250-B17 Series TP CEB 1296
250-B17F Series TP CEB 7%2018
Page4ofll
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Control Systems Dlvis!on
Collec Industries
July 12/96
SERVICE BULLETIN 734
2. Accornolishment Instructions
m Refer to the appropriate Component Maintenance Mangal 73-10-08 (MFP-263 or MFP-
264.i/MFP-264.2), latest revision, when pertorming the procedures in this bulletin.
FOLLOW ALL CAUTIONS AND WARNINGS IDENTIFIED IN CMM 73-10-08,
LATEST REVISION, TO MAXIMIZE SAFETY AND HEALTH.
A. Disassembly of main drive shaft and shaft seal. (Refer to F,gure I, disassembly will be the
same for MFP-264.l/MFP-264-2, only the housing will be different from the one illustrated).
(1) .Supi>ort the pump on a solid surface with the end of the drive shaft (20) facing up.
(2) Place removal tool STD68028 over the main drive shaft (20) and onto the e%posed
back of the shaft seal (10).
CAUTION: DO NOT EXERT EXCESSIVE FORCE ON THE SHAFT SEAL (10) OR
DRIVE SHAFT (20). USE ONLY ENOUGH FORCE TO SEPARATE THE
SHAFT SEAL FROM THE RETAINING RING (5) TO PERMIT ITS
REMOVAL.
(3) Use the removal tool STD68028 to depress the shaft seal (lo), separating it from the
retailiing ring (5).
(4) Using a dental pick or similar tool, pry the retaining ring (5) from its groove in the
housing (35). Exercise care to not damage the housin#g surfaces. Remove and dis-
card the ring.
(5) Place the tips of two flat bladed screwdrivers behind the packing groove on the main
drive shaft (20) and pry it together with the shaft seal (10) from the bore in the main
housing (35). Use care not to damage the surfaces of the housing or the drive shaft
during this operation. Discard the shaft seal.
(6) Remove and discard the loading spring (25).
(7) Remove and discard the preformed packing (15)
B. Assembly of main drive shaft and new shaft seal. (Refer to Figure 1, assembly will be the
same for MFP-264-l/MFP-264-2, only the housing will be different from the one illustrated).
(1) Install a new preformed packing (15) into the packing groove in the housing (35),
Apply a thin film of white petrolatum to the packiq.
July 31, 1996 269
1343
7~2059
73-3077
73-4035
1296
73-2018
Page5of11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Control Systems Division
COkC l”d”*lrle*
July 1 Z/96
SERVICE BULLETIN
(2) Check to ensure that the loading spring seat (30) is aligned over the driver gear (40).
lf necessary, center the seat over the driver gear with its flange against the gear.
Place a new spring (25) over the seat.
(3) Install the drive shaft (20) by inserting the smaller spiine through the loading spring
(25) and seat (30). Carefully engage the spline of the shaft with that in the mating
driver gear (40).
GA’JTION: DO NOT EXERT EXCESSIVE FORCE ON THE SHAFT SEAL (10) OR
DRIVE SHAFT (20). USE ONLY ENOUGH FORCE TO INSTALL THE LEAD-
ING EDGE OF THE SHAFT SEAL PAST THE PREFORMED PACKING (15).
Install the shaft seal (10) over the drive shaft (20) and into the drive shaft bore of the
main housing (35), making sure that the carbon sealing surface is toward the pump
interior. Press the shaft seal into the bore until its leading edge has passed the pre-
formed packing (15).
Place the guide of the retaining ring installation tool, STD67949 (MFP-263) or
STD67969 (MFP-264-1, -2), over the drive shaft (20) and center it in the drive shaft
bore of the main housing (35). Carefully place a new retaining ring (5) over the drive
shaft and into the installation guide.
Place the plunger of the retaining ring and shaft seal installation tool over the drive
shaft (20) and onto retaining ring (5).
CAUTION: DO NOT EXERT EXCESSIVE FORCE ON THE SHAFT SEAL (10) OR
DRIVE SHAFT (20). USE ONLY ENOUGH FORCE TO INSTALL THE
RETAINING RING (5) INTO THE ASSOCIATED GROOVE IN THE MAIN
HOUSING (35).
(7) Use the plunger to press the retaining ring (5) into the drive shaft bore of the main
housing (35). Press the ring into the bore until it snaps into place in the groove in the
housing bore.
(8) Remove the plunger and guide of the retaining ring installation tool,
July31, 1996 25a-Cl 6 Series CEB 289
25o-C20 Series CEB 1343
25&CZ6 Series CEB 73-2059
25o-C30 Series CEB 73-3077
25oC2OR Series CEB 73-IO35
25o-B17 Series TP CEB 1296
25o-Bl7F Series TP CEB 73-2016
Page6ofll
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Conirol Systems Division
Coltec Industries
July 12/96
SERVICE BULLETIN 73-l
m Item slumbers in the remaining paragraphs refer to figure 2 of this bulletin
C. Reidentify as follows:
(I) Remove the two screws (5) and identification plate (1 O), Discard the old identification
plate.
(2) Using a marking method such as metal stamping, fill out a new identification plate (10)
with information as indicated in the table below.
I
OLD NEW
LzIzzzzz
PIN 1 13300.~01 AI 113300.02Al I
I
1 63005 SOCN ~ 23057338
~ 1 23065132
MFP-264-i 113310.OiAl I 113310.02Ai
6300: SOCN 23057339 I 23065133 I
L
MFF’.264.2 P/N
63005 SOCN
All other identification plate information remains unchanged. If necessary, other ser-
vrce bulletin identification information shall be transferrl?d to the new identification
plate prior to installation, using a marking method such as hand scribing, vibro-etch-
ing, or metal stamping.
(3) Attacli the new identification plate (10) with two screws (5)
D. Compliance? with this service bulletin can be optionally recorded on the Component Record
Card.
July 31, 1996 CEB 289
CEB 1343
CEB 73-2059
CEB 7>3077
CEB 73-4035
TP CEB 1296
TP CEB 73-2018
Page 7 of 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
ConIrol Systems Division
CcdkC lnduslr,es
July 12/96 63
734 SERVICE BULLETIN
5 Retaining Ring M2742.Z.3129D
10 Shaft Seal SC1 13245.1 (Old P/N)
SC1 13955-l (New P/N)
15 Preformed Packing 78172-026
20 Main Drive Shaft 113243-l
25 Spring 113497-l (Old P/N)
113956-i (New P/N)
30 Spring Seat 113466-l
35 Pump Housing 113246-l (MFP-263) or
113253-l (MFP-264-11-2)
40 Driver Gear 113242-l
m: THIS FIGURE ILLUSTRATES MFP-263
HOUSING (35) ONLY, MFP-264-l AND
MFP-264-Z HOUSINGS WILL BE DIFFERENT.
MFP-263 Main Drive Shaft Assembly
Figure 1
July 31, 1996 25O-Cl8 Series CEB 289
250X20 Series CEB 1343
250X28 Series CEB 73-2059
25O-C30 Series CEB 73-3077
25C-C2OR Series CEB 73-4035
25&Bl7 Series TP CEB 1296
25C-Bl7F Series TP CEB 7%2016
Page 8 of 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Control Systems Diviz,ion
Coltec Industries
July 12/96
SERVICE BULLETIN 734
LEGEND
5 Screw MS51861-1C
10 Identification Plate 1 13268-l
Identification Plate Location (MFP-263;1
Figure 2
July 31, 1996 250416 Series CEB 289
250420 Series CEB 1343
25%-CZ3 Series CEB 73-2059
250430 Series CEB 73-3077
25O-C2OR Series CEB 734035
250-B17 Series TP CEB 1296
25C-Bl7F Series TP CEB 73-2018
Page 9 of 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
Confrol Systems Division
Coke Industries
July 12/96 @
73-l SERVICE BULLETIN
THIS PAGE INTENTIONALLY LEFT BLANK
July 31, 1996 250X113 Series CEB 289
25O-CZO Series CEB 1343
250X28 Series CEB 73-2059
25O-C30 Series CEB 73-3077
25O-C2OR Series CEB 73-4035
250-Bl7 Series TP CEB 1296
250-Bl7F Series TP CEB 73-2018
Page 1OOf 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
Chandler Evans
July 12/96
SERVICE BULLETIN 73-l
3, Material Infor\%-
The basis for the following information is per the pump assembly.
Reference:Chandler Evans Control Systems Division Model MFF-263 Main Fuel Pump Com-
ponent Maintenance Manual 73-10-08, latest revNon and Chandler Evans Con-
tirol Systems Division Model MFP-264-l & MFP-264-2 Main Fuel Pump
Component Maintenance Manual 73-10-08, latest revision.
July 31, 1996 25C-Cl8 Series
25C-C20 Series
250X28 Series
250X30 Series
25O-C2OR Series
250-I317 Series
25C-Bl7F Series
Page 11 of 11
Rolls-Royce Proprietary Data – Uncontrolled Printed Copy
