K11065398

Solution K11065398
Tuesday, December 5, 2017 9:10:10 PM CET
Solution
Title (customer effect)
Mack Chassis - Crankcase Venilation ( CCV ) Oil Leaks - US14 Emissions And Newer
Cause
Mack Trucks has received reports from the aftermarket regarding oil leaks at the CCV
housing inlet tube and at the split line between the upper and lower housings on chassis
builds between January 1, 2014 and January 26, 2016 with MP7, MP8,
and MP10 engines. It has been determined that the O-ring installed on the inlet tube is
the source of the leak and oil may leak down the back of the housing giving the
impression that the housing split line is also leaking.
Solution
Should there be a report of this nature on a chassis built after January 1, 2014, do not
disassemble the CCV. Remove the inlet tube assembly and carefully replace the O-ring
at the quick connect fitting with part 85148758 using an O-ring pick. Be careful to not
scratch the plastic quick connect housing with the O-ring pick during this procedure as
this may cause an oil leak. Return the parts through normal warranty procedures if
requested. If it is determined that there is a leak at the housing other than the inlet Oring, the complete assembly will need to be replaced as this is a non-serviceable part. Do
not attempt to tighten the split line screws on the housing or disassemble the assembly as
seals and repair parts are no longer available for this component as they were on the
older version of this component. NEW - If the quick connect fitting is cracked or
breaks on disassembly, replace the complete tube assembly. If the collar on the CCV
inlet is worn or broken at the locking lip, replace the complete CCV assembly.
This bulletin is temporary in nature and will be replaced with an updated publication
once a permanent correction has been created.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
Documentation , SNM , engine
Function Group
Function Group
21 engine
Customer effect
Main customer effect
fluid
Fluid problem
leak
Fluid implicated
oil
Fluid pressure
normal pressure
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
when driving , when stationary
always
Administration
Author
A241298
Last modified by
RU4469V
Creation date
18-01-2017 16:01
Date of last update
05-12-2017 17:12
Status
Published
NA_MACK_Vehicle_Range
NA_MACK_Vehicle_Ran
ge
Cabover , LR , LEU , MRU , Conventional , CHU , CXU , GU
Engine family
Engine family
Mack , MP7 , MP8 , MP10
Emission Standard
Emission Standard
US14 CNG , US16 , US15 , US14 GHG