Yo, next up is;
yo,
M-Block 351M/400 by Bubba (Dave R) at earthlink.net via web.archive.org
http://web.archive.org/web/20050405150658/home.earthlink.net/~bubbaf250/index.html
==
In his
M-Block 351M/400 Parts Reference Section, Dave has sub-sections for;
The following sections list Ford OEM part numbers, service part numbers, and ID codes for most common M-block engine components. Motorcraft OEM replacement part numbers are listed when available.
Cast Iron Parts
Includes blocks, heads, crankshafts, and intake and exhaust manifolds.
Internal Engine Parts
Includes connecting rods, pistons, camshafts, valve train, etc.
Accessory and External Parts
Includes engine accessories (water pump, fuel pump, harmonic dampers), oil pans, valve covers, engine mounts, clutch parts, etc.
Emissions Control Devices
Includes Thermactor pumps, diverter valves, EGR valves, PCV valves, air cleaner temperature sensors, etc.
Carburetors and Fuel System Parts
Includes fuel pumps, carburetors, and carburetor parts such as automatic choke parts, throttle positioners, power valves, hot-idle compensators, carb-to-manifold spacers, bowl vent valves and vent solenoids, etc.
Ignition System Parts
Includes distributors and distributor parts, ignition control modules, coils and ballast resistors, etc.
==
Here is the Emission Section; for posterity in case web.archive dumps his info/site
Emissions Control Devices
Copyright © 2002-2003 Dave Resch
All rights reserved.
--------------------------------------------------------------------------------
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.
Check out this section if you are not familiar with Ford part numbers and ID codes.
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.
Description
Part Number
Notes
Thermactor pump
E1TZ-9A486-D
OEM repl. All '77-'81 351M/400 truck, except '79 CA emissions.
Thermactor pump
E7TZ-9A486-J
OEM repl. '79 351M/400 truck w/ CA emissions, all '82 351M/400 truck.
Thermactor check valve
D7AZ-9A487-A
OEM repl. All '77-up 351M/400.
(Motorcraft CX-103)
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.
Description
Part Number
Calib. ID
Notes
Thermactor diverter valve
D4AZ-9B289-A
D4AE-AA
(obsolete)
Thermactor diverter valve
D4OZ-9B289-A
D4OE-AA
(obsolete)
Thermactor diverter valve
D4TZ-9B289-A
D4TE-AA
(obsolete)
Thermactor diverter valve
D4VY-9B289-A
D4VE-AA
(obsolete)
Thermactor diverter valve
D5AZ-9B289-C
D5AE-CB
(obsolete)
Thermactor diverter valve
D5DZ-9B289-A
D5DE-AA
(obsolete)
Thermactor diverter valve
D5TZ-9B289-B
D5TE-AA
D5TE-AB
(obsolete)
Thermactor diverter valve
D5UZ-9B289-A
D5UE-AA
(obsolete)
Thermactor diverter valve
D5ZZ-9B289-E
D5ZE-EA
(obsolete)
Thermactor diverter valve
D6TZ-9B289-A
D6TE-AA
(obsolete)
Thermactor diverter valve
D7TZ-9B289-B
D7TE-BA
(obsolete)
Thermactor diverter valve
D8TZ-9B289-A
D8TE-AA
(obsolete)
Thermactor diverter valve
E1TZ-9B289-C
E1TE-CA
E1TE-GA
Current service part.
(Motorcraft CX-560)
Thermactor diverter valve
E1ZZ-9B289-A
D5ZE-FA
(obsolete)
Thermactor diverter valve
E3TZ-9B289-G
D8BE-BA
E1TE-DA
Current service part.
(Motorcraft CX-938)
Thermactor diverter valve
E3TZ-9B289-F
D8BE-DA
Current service part.
(Motorcraft CX-221-B)
Thermactor diverter valve
E3TZ-9B289-E
D8EE-AA
E1TE-EA
Current service part.
(Motorcraft CX-222-A)
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.
Description
Part Number
Notes
EGR valve
D8DE-9D475-C1A
D8DE-9D475-C2A
'80-up 351M/400 truck.
(obsolete)
EGR valve
D8DZ-9D475-C
'80-up 351M/400 truck.
(obsolete)
EGR valve
D8DZ-9D475-CA
All '80-up 351M/400 truck.
(Motorcraft CX-301-A)
EGR valve
D8TE-9D475-A1A
D8TE-9D475-A2A
'78 351M/400 truck, auto trans, CA emissions. '79 351M/400 HD truck, 49-state.
(obsolete)
EGR valve
D8TE-9D475-AA
'79 351M/400 HD truck, 49-state.
(obsolete)
EGR valve
D9TE-9D475-C1A
D9TE-9D475-C2A
'78 351M/400 truck, auto trans, CA emissions. '79 351M/400 HD truck, 49-state.
(obsolete)
EGR valve
D9TE-9D475-CA
'79 351M/400 HD truck, 49-state.
(obsolete)
EGR valve
E0AE-9D475-C1A
E0AE-9D475-C2A
'80 351M LD truck.
(obsolete)
EGR valve
E3UE-9D475-A1A
E3UE-9D475-A2A
'78 351M/400 truck, auto trans, CA emissions.
(obsolete)
EGR spacer plate
D7TE-9A589-A
All '77-'82 351M/400 truck.
(obsolete)
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.
Description
Part Number
Notes
PCV valve
D7AZ-6A666-A
All '77-'78 351M/400 truck.
(Motorcraft EV-93)
PCV valve
D9OZ-6A666-A
All '79-up 351M/400 truck.
(Motorcraft EV-68-C)
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.
Description
Part Number
ID Code
Notes
Vacuum motor
D7AZ-9D612-C
—
'82 351M HD truck.
(Motorcraft CX-149)
Vacuum motor
D7TZ-9D612-B
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)
Vacuum motor
E2ZZ-9D612-A
—
'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)
Vacuum motor
D9FZ-9D612-A
pink
'82 400, auto/manual trans, CA/49-states.
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.
Air Cleaner Temperature Sensor #9E607
Ford Service P/N
Motorcraft P/N
Color Code
Notes
D0ZZ-9E607-B
—
blue
All 351M/400.
105°F min. open
D4FZ-9E607-B
CX-1384
green
All 351M/400.
105°F min. open
D4ZZ-9E607-A
—
yellow
All 351M/400.
105°F min. open
D7DZ-9E607-A
CX-146
—
'82 351M/400.
D7FZ-9E607-A
CX-109
brown
All 351M/400.
75°F min. open
D8TZ-9E607-A
—
white
All 351M/400.
90°F min. open
Color codes and specifications for 9A995, 9E607, and 9E862 air temperature vacuum switches are listed on this page.
http://web.archive.org/web/20041112125629/home.earthlink.net/~bubbaf250/2150carb/carb13.html
Air Temperature Sensor
Specifications
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From the early 1970s to the late 1980s, there were three different air temperature vacuum switches that Ford used in air cleaner housings:
ACTS (air cleaner temperature sensor) #9E607 — thermostatic vacuum bleed device with a metal housing, normally open, stops bleed (i.e., transmits vacuum) when air temperature drops below a calibrated point.
TVS (temperature vacuum switch) #9A995 — thermostatic vacuum switch with a plastic housing, either normally open or normally closed, opens to pass vacuum through when air temperature rises above a calibrated point.
CWM (cold weather modulator) #9E862 — thermostatic vacuum switch with a plastic housing, either normally open or normally closed, opens to pass vacuum through when air temperature rises above a calibrated point.
Calibrated open/close temperatures for these devices are indicated with color coding on the housing.
The following tables list color codes and calibration temperatures for current OEM replacement ACTS, TVS, and CWM devices.
Air Cleaner Temperature Sensor #9E607
Color Code
Calibration
brown
open (bleed) at 75°F minimum
pink, black
open (bleed) at 90°F minimum
clear (no dot)
open (bleed) at 90°F minimum
blue, yellow, green
open (bleed) at 105°F minimum
Temperature Vacuum Switch #9A995
Color Code
Calibration
white
closes at 50°F, opens at 76°F
brown
closes at 15°F, opens at 30°F
purple
closes at 40°F, opens at 55°F
red
opens at 50°F, closes at 60°F
(normally closed)
Cold Weather Modulator #9E862
Color Code
Calibration
black
closes at 20°F, opens at 35°F
blue
closes at 40°F, opens at 55°F
green
closes at 50°F, opens at 76°F
yellow
opens at 50°F, closes at 65°F
(normally closed)