SB-10045821-1548

S ervic e P rogram
Tr u c k s

M a c k Tr u c k s , I n c .
Greensboro, NC USA

Date

Group

No.

Release

Page

8.2012

258

795

01

1(10)

Aftertreatment Diesel Particulate Filter (DPF)
Inlet Pipe
GU
Cummins ISL

P I0 7 9 5 , A fte rtre a tme n t D ie s e l P a rti c u la te Fi lte r
(DP F) Inlet Pipe
August 2012
Certain Mack GU trucks with the Cummins ISL engine built from 8-25-2011 to 4-11-2012 may
exhibit an exhaust leak at the Aftertreatment Diesel Particulate Filter (DPF) inlet pipe. The
DPF inlet pipe flange has been modified to improve the sealing function of the DPF inlet pipe.
Trucks built between these dates should replace the DPF inlet pipe (21534291) with new inlet
pipe (21921104). New gaskets are installed on both ends of the new DPF inlet pipe.
Additionally, a new v-band clamp (21601828) is required to complete the installation.
N o t e : This bulletin does not apply to MACK Trucks Australia.

W2076382

DPF Inlet Pipe Pa rts

P V 7 2 9 - PI0795

Item #

QTY

P art N umb er

Des cription

1

1

21921104

Exhaust Pipe, DPF Inlet

2

1

21601828

V-Band Clamp, DPF Inlet Pipe to DPF

3

1

21601830

Gasket (DPF Inlet)

4

1

21095721

Gasket (Flex Pipe)

5

1

N/A

V-Band Clamp to Flex Pipe, Existing
USA55078

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

P roc edu re
You must read and understand the precautions and guidelines in Service Information,
group 20, "General Safety Practices, Engine" before performing this procedure. If you are
not properly trained and certified in this procedure, ask your supervisor for training before
you perform it.
1 Secure the vehicle for service by parking it on a flat level surface, applying the parking
brake, chocking the rear wheels, and placing the transmission in neutral or park.
2 Disconnect all battery cables from the negative (ground) battery terminals to prevent
personal injury from electrical shock and prevent damage to electrical components.
3 Remove fasteners securing the DPF heat shield assembly.

W2076383

4 Remove DPF heat shield assembly.

W2076384

Page
2(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

5 Remove fasteners from inlet pipe heat shield and remove heat shield.

W2076385

6 Loosen DPF inlet pipe clamp fastener and remove clamp.

W2076386

Page
3(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

7 Remove DPF inlet pipe to DPF flex pipe clamp v-band clamp.
N o t e : Inspect the existing DPF inlet pipe to DPF flex pipe v-band clamp for damage.
Replace the clamp if damage is present. If no damage is present, store the clamp for
reuse.

W2076387

8 Remove DPF inlet pipe to DPF v-band clamp and discard.
N o t e : Do not reuse the v-band clamp to the DPF inlet.

W2076388

Page
4(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

9 Remove the DPF inlet pipe with gaskets and discard.
N o t e : Do not reuse old Gaskets.

W2076389

10 Clean sealing surfaces on DPF inlet and exhaust pipe from engine.
11 Position new gasket (Item 3, part number 21601830) on DPF inlet and (item 4, part
number 21095721) on flex pipe as shown in figure below.

W2076390

Page
5(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

12 Position new clamp (item 2, part number 21601828) on the DPF inlet.
N o t e : Do not tighten clamps at this time.
13 Position existing v-band clamp (Item 5) on flex pipe.
N o t e : Reuse the existing flex pipe v-band clamp.
N o t e : Do not tighten clamps at this time.

W2076391

14 Position new DPF inlet pipe (part number 21921104) to DPF inlet and flex pipe.

W2076392

Page
6(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

15 Tighten DPF inlet pipe to DPF v-band clamp (Item 2) 13 +2/-0 Nm (10 +1/-0 ft-lb).
16 Tighten DPF inlet pipe to DPF flex pipe v-band clamp (Item 5) 8 +2/-0 Nm (6 +1/-0 ft-lb).

W2076393

17 Install DPF inlet pipe clamp and tighten fastener to 24 ± 4 Nm (18 ± 3 ft-lb).

W2076386

Page
7(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

18 Position inlet pipe heat shield and tighten fasteners to 24 ± 4 Nm (18 ± 3 ft-lb).

W2076385

19 Install DPF heat shield assembly.

W2076394

Page
8(10)

M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

20 Install fasteners securing the DPF heat shield assembly and tighten fasteners to 24 ± 4
Nm (18 ± 3 ft-lb).

W2076383

21 Reconnect all previously removed cable to the negative (ground) battery terminals.
22 Start engine and check for leaks.

N o t e : To signify that the campaign has been completed, using a permanent-type marker
(such as a Sharpie®) to write the campaign number (PI0795) and completion date in the
spaces provided on the Campaign Completion label located inside the cab as shown in the
illustration below. If a label is not already affixed inside the cab, apply a label (part No. TS897)
and supply the information as required. Campaign Completion labels are available in packs of
50 and can be ordered by faxing a completed BR313 to Pacesetters Business Services at
610-264-9465.

W8034103

Page
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M a c k Tr u c k s , I n c .
S e rv ic e P ro gra m

Date
8.2012

Group

No.

Release

258

795

01

R ei mbu rs ement
Thi s repai r is c ov ered by an aut hori z ed S erv i c e P rogram. R ei mburs ement i s
obt ain ed throu gh the n ormal c l ai m hand li ng proc es s .
C l a i m Ty p e ( u s e d o n l y w h e n u p l o a d i n g f r o m t h e D e a l e r B u s . S y s . )

B

Rec all Sta tus
Vehicle inspected, repair not required

1- Inspected OK

Vehicle repaired per instruction

2- Modified per
instruction

Labor Code
Primary Labor Code

2344M-ZZ-96
0.7 hrs.

Time to take charge and determine campaign status

101AA–0A–00
0.3 hrs.

Caus al P art

21534291

A ut hori z at io n N umbe r

PI0795

Ex piration Date

28 AUG 2013

N o t e : Take Charge Time is not included in the Labor Code for this operation. Take charge
may be eligible but can only be used once per repair visit. If vehicle is having other warranty
repairs performed, take charge should be charged to the warranty repair, otherwise take
charge can be charged to this service program.

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