M-Block 351M/400
Parts Reference
Emissions Control
Devices
Copyright © 2002-2003 Dave Resch
All rights reserved.
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This section lists Ford part numbers and ID codes for the
following
M-block (351M/400) emissions control devices:
-
Thermactor AIR (air injection reaction) pump, check valve,
and backfire diverter valve
-
EGR (exhaust gas recirculation) valve and EGR spacer plate
-
PCV (positive crankcase ventilation) valve
-
Air cleaner heat stove vacuum motor
-
Air cleaner temperature sensors
Some other emissions control and related devices, and engine
calibrations,
are listed in the
Carburetors and Fuel System Parts
and
Ignition System Parts
sections.
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Check out
this section
if you are not familiar with Ford part numbers and ID codes.
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Thermactor pump and check valve
The name “Thermactor” is Ford’s trademark brand name for the
emissions
control system known generically as AIR (air injection
reaction).
The function of the AIR system is to blow fresh air into the
exhaust
gas stream. There are two benefits of this system:
-
Fresh air blown into the exhaust gas, just downstream of the
exhaust ports, provides oxygen (O2) to promote further
combustion of
any remaining unburned hydrocarbons (HCs) in the exhaust
gas.
-
Catalytic converters require additional oxygen to convert
the
carbon monoxide (CO) and hydrocarbons in exhaust gases into
carbon dioxide (CO2) and water (H2O).
The Thermactor AIR system for M-block engines consists of the
following
components:
-
Thermactor pump — a simple vane-type air pump driven by a
belt on
the front of the engine
-
Thermactor backfire diverter valve — a vacuum-controlled
valve that diverts
air pump output to the atmosphere to prevent backfiring
under high manifold
vacuum (i.e., closed throttle) conditions
-
Check valve — a one-way valve downstream of the air pump and
diverter valve
that prevents exhaust backpressure from pushing hot exhaust
gases back up
into the AIR components
In addition to the Thermactor AIR components, two of the main
cast parts
of the engine have special provisions for the AIR system:
-
Intake manifold — a threaded port for the check valve and a
dedicated
AIR distribution passage in the front of the '75-up M-block
intake
manifold deliver fresh air from the Thermactor pump to AIR
passages
in the cylinder heads.
-
Cylinder heads — AIR passages in '73-up M-block and 351C 2V
cylinder heads,
including holes drilled into the intake side on each end of
the cylinder
head, a long passage drilled lengthwise through the cylinder
head (just
above the exhaust ports), and corresponding holes drilled
from the exhaust
ports into the long passage. These allow fresh air to be
injected directly
in the exhaust ports by the Thermactor AIR system.
The following table lists Thermactor AIR pump (smog pump) and
check
valve service part numbers for '77-up M-block truck engines.
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Description
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Part Number
|
Notes
|
Thermactor pump
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E1TZ-9A486-D
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OEM repl. All '77-'81 351M/400 truck, except '79 CA
emissions.
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Thermactor pump
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E7TZ-9A486-J
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OEM repl. '79 351M/400 truck w/ CA emissions, all '82
351M/400 truck.
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Thermactor check valve
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D7AZ-9A487-A
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OEM repl. All '77-up 351M/400.
(Motorcraft CX-103)
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Thermactor backfire diverter valve
The Thermactor backfire diverter valve was also referred to as
the
“AIR bypass valve” in some Ford technical literature. On some
vacuum
system diagrams, it is labeled “AIR BPV” or just “BPV.”
The following table lists Thermactor backfire diverter valve
service part
numbers for '77-up M-block truck engines. Both Ford and
Motorcraft part
numbers are listed, when available.
Note: Many of these part numbers are obsolete, however,
some
are still available from either regular Ford dealers or
obsolete parts
sources.
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Description
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Part Number
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Calib. ID
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Notes
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Thermactor diverter valve
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D4AZ-9B289-A
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D4AE-AA
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(obsolete)
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Thermactor diverter valve
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D4OZ-9B289-A
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D4OE-AA
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(obsolete)
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Thermactor diverter valve
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D4TZ-9B289-A
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D4TE-AA
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(obsolete)
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Thermactor diverter valve
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D4VY-9B289-A
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D4VE-AA
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(obsolete)
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Thermactor diverter valve
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D5AZ-9B289-C
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D5AE-CB
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(obsolete)
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Thermactor diverter valve
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D5DZ-9B289-A
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D5DE-AA
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(obsolete)
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Thermactor diverter valve
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D5TZ-9B289-B
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D5TE-AA
D5TE-AB
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(obsolete)
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Thermactor diverter valve
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D5UZ-9B289-A
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D5UE-AA
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(obsolete)
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Thermactor diverter valve
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D5ZZ-9B289-E
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D5ZE-EA
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(obsolete)
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Thermactor diverter valve
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D6TZ-9B289-A
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D6TE-AA
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(obsolete)
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Thermactor diverter valve
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D7TZ-9B289-B
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D7TE-BA
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(obsolete)
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Thermactor diverter valve
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D8TZ-9B289-A
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D8TE-AA
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(obsolete)
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Thermactor diverter valve
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E1TZ-9B289-C
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E1TE-CA
E1TE-GA
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Current service part.
(Motorcraft CX-560)
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Thermactor diverter valve
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E1ZZ-9B289-A
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D5ZE-FA
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(obsolete)
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Thermactor diverter valve
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E3TZ-9B289-G
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D8BE-BA
E1TE-DA
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Current service part.
(Motorcraft CX-938)
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Thermactor diverter valve
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E3TZ-9B289-F
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D8BE-DA
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Current service part.
(Motorcraft CX-221-B)
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Thermactor diverter valve
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E3TZ-9B289-E
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D8EE-AA
E1TE-EA
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Current service part.
(Motorcraft CX-222-A)
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EGR valve and spacer plate
The following table lists EGR valve and EGR spacer plate part
numbers
for '77-up M-block truck engines. Motorcraft part numbers are
listed,
when available.
Note: Many of these part numbers are obsolete, however,
some
are still available from either regular Ford dealers or
obsolete parts
sources.
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Description
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Part Number
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Notes
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EGR valve
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D8DE-9D475-C1A
D8DE-9D475-C2A
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'80-up 351M/400 truck.
(obsolete)
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EGR valve
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D8DZ-9D475-C
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'80-up 351M/400 truck.
(obsolete)
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EGR valve
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D8DZ-9D475-CA
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All '80-up 351M/400 truck.
(Motorcraft CX-301-A)
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EGR valve
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D8TE-9D475-A1A
D8TE-9D475-A2A
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'78 351M/400 truck, auto trans, CA emissions.
'79 351M/400 HD truck, 49-state.
(obsolete)
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EGR valve
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D8TE-9D475-AA
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'79 351M/400 HD truck, 49-state.
(obsolete)
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EGR valve
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D9TE-9D475-C1A
D9TE-9D475-C2A
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'78 351M/400 truck, auto trans, CA emissions.
'79 351M/400 HD truck, 49-state.
(obsolete)
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EGR valve
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D9TE-9D475-CA
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'79 351M/400 HD truck, 49-state.
(obsolete)
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EGR valve
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E0AE-9D475-C1A
E0AE-9D475-C2A
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'80 351M LD truck.
(obsolete)
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EGR valve
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E3UE-9D475-A1A
E3UE-9D475-A2A
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'78 351M/400 truck, auto trans, CA emissions.
(obsolete)
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EGR spacer plate
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D7TE-9A589-A
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All '77-'82 351M/400 truck.
(obsolete)
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PCV valve
The following table lists PCV valve part numbers for '77-up
M-block
truck engines. Both Ford service part and Motorcraft part
numbers
are listed.
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Description
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Part Number
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Notes
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PCV valve
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D7AZ-6A666-A
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All '77-'78 351M/400 truck.
(Motorcraft EV-93)
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PCV valve
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D9OZ-6A666-A
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All '79-up 351M/400 truck.
(Motorcraft EV-68-C)
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Air cleaner heat stove vacuum motor
On M-block engines, the air cleaner heat stove consists of a
sheet metal
shroud around the right (passenger side) exhaust manifold, and
flexible,
corrugated tubing from the shroud to the bottom of the intake
snorkel on
the air cleaner housing. When vacuum is applied to the heat
stove vacuum
motor, the motor moves a diverter flap inside the snorkel to
close off
the normal cold air intake and open up the heat stove warm air
intake.
The vacuum motor is controlled by a temperature sensing vacuum
switch
inside the air cleaner housing (the ACTS, described in the next
section).
The following table lists air cleaner heat stove vacuum motor
service
part numbers for '77-up M-block truck engines. Motorcraft part
numbers
are listed where available.
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Description
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Part Number
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ID Code
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Notes
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Vacuum motor
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D7AZ-9D612-C
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—
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'82 351M HD truck.
(Motorcraft CX-149)
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Vacuum motor
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D7TZ-9D612-B
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brown
|
'77-'81 all 351M/400 truck. '79 351M car w/ high-altitude.
'82 351M LD truck. '82 400, auto/manual trans,
CA/49-states.
(Motorcraft CX-120)
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Vacuum motor
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E2ZZ-9D612-A
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—
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'77-'79 some 351M/400 truck w/ CA emissions.
'79 351M car w/o high-altitude.
'82 400, auto trans, 49-states.
(Motorcraft CX-762)
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Vacuum motor
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D9FZ-9D612-A
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pink
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'82 400, auto/manual trans, CA/49-states.
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Air cleaner temperature sensors
There are three different air temperature vacuum switches that
Ford
used in air cleaner housings:
-
ACTS (air cleaner temperature sensor) #9E607
-
TVS (temperature vacuum switch) #9A995
-
CWM (cold weather modulator) #9E862
The ACTS (9E607) is a thermostatic vacuum switch with a metal
housing.
The TVS (9A995) and CWM (9E862) are thermostatic vacuum
switches with
plastic housings. Calibrated open/close temperatures for these
devices
are indicated with color coding on the housing.
The ACTS controls the air cleaner heat stove vacuum motor by
reacting
to the air temperature inside the air cleaner housing. When the
air
temperature drops below the calibrated opening temperature of
the
ACTS, the valve inside the ACTS opens, supplying manifold
vacuum to the air cleaner heat stove vacuum motor.
When the heat stove vacuum motor closes the diverter flap
inside the
intake snorkel, the engine draws intake air through the air
cleaner
heat stove system. When the engine has run a few minutes after a
cold
start, radiant heat from the exhaust manifold warms up the air
drawn
through the shroud, and the heat stove system supplies warm air
to
the engine.
When the temperature of the air inside the air cleaner housing
exceeds
the calibrated opening temperature of the ACTS, the valve
inside
the ACTS closes, cutting off the vacuum source (manifold
vacuum) and
bleeding the residual vacuum in the hose and the vacuum motor
diaphragm.
When vacuum is released from the vacuum motor diaphragm, an
internal
spring in the motor pushes it back to its rest position, which
returns
the intake snorkel diverter flap to its normal position for
cold air
intake.
The following table lists ACTS service part numbers specified
for
1977 to 1982 M-block truck engines. Motorcraft part numbers are
listed where available.
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Air Cleaner Temperature Sensor #9E607
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Ford Service P/N
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Motorcraft P/N
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Color Code
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Notes
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D0ZZ-9E607-B
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—
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blue
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All 351M/400.
105°F min. open
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D4FZ-9E607-B
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CX-1384
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green
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All 351M/400.
105°F min. open
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D4ZZ-9E607-A
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—
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yellow
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All 351M/400.
105°F min. open
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D7DZ-9E607-A
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CX-146
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—
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'82 351M/400.
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D7FZ-9E607-A
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CX-109
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brown
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All 351M/400.
75°F min. open
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D8TZ-9E607-A
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—
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white
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All 351M/400.
90°F min. open
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Color codes and specifications for 9A995, 9E607, and 9E862 air
temperature
vacuum switches are listed on
this page.
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