NHTSA ID Number: 10200217
Manufacturer Communication Number: FSB 257 003
TSB/Document Date: 2021-08-09
Summary
Crankcase Ventilation Tube Heater. For customer operating vehicles in extreme cold temperatures, Mack Trucks
has developed a device that will prevent the crankcase ventilation (CCV) tube from building up ice and freezing over which could lead to engine damage.
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TSB/Document ID: FSB 257 003
Replacement Service Bulletin Number:
MFR Communication Date: 2015-10-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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Mack Trucks, Inc.
Greensboro, NC USA
Field Service Bulletin
Trucks
Date
Group
No.
Release
Page
10.2015
257
003
01
1(24)
Crankcase Ventilation Tube Heater
Installation
MP7, MP8, MP10
FSB 257-003, Crankcase Ventilation Tube Heater
Installation
(October 2015)
For customer operating vehicles in extreme cold temperatures, Mack Trucks has developed a
device that will prevent the crankcase ventilation (CCV) tube from building up ice and freezing
over which could lead to engine damage. The kit (part number 22578454) is available from
the PDC and consists of two components:
•
•
Heater Cable 12 volt
Vent Heater Jumper
Procedure
You must read and understand the precautions and guidelines in Service Information,
Function Group 2, Engine Safety Practices 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 cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components
PV729-FSB257-003_M
USA53229
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
MP7 Engines
1 Remove the secondary fuel filter and discard the filter.
W2106368
A. Filter Wrench
Page
2(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
2 Remove the bracket bolt at the bottom of the CCV pipe.
W2106365
3 Loosen the hose clamp at the top of the CCV pipe.
W2106369
Page
3(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
4 Remove the CCV pipe.
W2106370
5 Measure and mark the CCV pipe for drilling. Install the grommet on the heating element.
The end of the heating element should extend 25.4 mm (1 in) below the end of the pipe.
W2106371
Mark the pipe at the grommet area
A. 25.4 mm (1 in)
B. 267 mm (10.5 in)
1. Heating Element
2. Grommet
Page
4(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
6 Center punch the CCV pipe.
W2106372
7 Drill a 6 mm (0.25 in) pilot hole.
W2106373
Page
5(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
8 Drill a 16 mm (0.625 in) hole. De-burr the hole.
W2106374
Page
6(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
9 Install the CCV heater element in the pipe. Secure the heating element to the pipe. The
radius of the heater element cable must not be less than 25 mm (0.98 in).
CAUTION
Do not bend the heater cable excessively. Damage to the cable may result.
Note: The end of the heating element should extend 25.4 mm (1 in) below the end of the
pipe.
W2106375
1. Heating Element
2. Grommet
W2106447
X must be greater than 25 mm (0.98 in)
Page
7(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
10 Install the CCV pipe. Tighten the bracket bolt at the bottom of the CCV pipe to 24 ±4 Nm
(18 ±3 ft-lb) and tighten the hose clamp to 4 ±0.6 Nm (35 ±5 in-lb).
11 Install a new secondary fuel filter.
W2106448
Page
8(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
MP8 Engines with Molded Rubber CCV Pipe
1 Measure and mark the CCV pipe for cutting. The end of the heating element should extend
25.4 mm (1 in) below the end of the pipe.
W2106453
Mark the pipe at the grommet area
A. 25.4 mm (1 in)
B. 267 mm (10.5 in)
1. Heating Element
Page
9(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
2 Cut a 16 mm (0.6 in) horizontal slice in the pipe.
W2106454
A. 16 mm (0.6 in)
Page
10(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
3 Install the CCV heater element in the pipe. Secure the heating element to the pipe. The
radius of the heater element cable must not be less than 25 mm (0.98 in).
CAUTION
Do not bend the heater cable excessively. Damage to the cable may result.
Note: The end of the heating element should extend 25.4 mm (1 in) below the end of the
pipe.
W2106455
A. 25.4 mm (1 in)
1. Heating Element
2. Cable Tie
Page
11(24)
Mack Trucks, Inc.
Field Service Bulletin
Date
10.2015
Group
No.
Release
257
003
01
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