2023 FORD F650/750 check engine

GENERAL INFORMATION
WARNING: Making modifications
to various parts, components and
systems of the vehicle, such as brake and
steering systems, can adversely affect
the quality, reliability and operation of
your vehicle and could result in property
damage, personal injury or death. Such
modifications must be avoided.
WARNING: Failure to properly
perform maintenance and servicing
procedures could result in vehicle
damage, personal injury or death.
WARNING: Take care when
performing any maintenance, system
check or service on your vehicle. Some
of the materials may also be hazardous
if used, serviced or handled improperly
and could result in property damage,
personal injury or death.
If the owner or operator of the vehicle is a
skilled technician and intends on
performing the vehicle maintenance and
service, he is strongly urged to purchase a
service manual.
Always use care when performing vehicle
maintenance, repairs or system checks.
Improper or incomplete service could result
in your vehicle not working properly which
may result in personal injury or damage to
your vehicle or equipment. It is the
operator’s responsibility to see that your
vehicle receives proper care and
maintenance. If you have any questions
about performing service, have the service
done by a qualified technician.
To help you service your vehicle, we
provide scheduled maintenance
information which makes tracking routine
service easy. See Scheduled
Maintenance (page 319).If your vehicle requires professional service,
an authorized dealer can provide the
necessary parts and service. Check your
warranty information to find out which
parts and services are covered.
Use only recommended fuels, lubricants,
fluids and service parts conforming to
specifications. Motorcraft® parts are
designed and built to provide the best
performance in your vehicle.
Servicing Guidelines
WARNING: The use of inferior parts
can adversely affect the quality and
reliability of your vehicle and could result
in property damage, personal injury or
death.
When servicing your vehicle:
• Always wear safety glasses for eye
protection.
• Always set the parking brake or chock
the wheels.
• Always use support stands, not a jack,
when working under a raised vehicle.
• Always turn off the ignition unless a
procedure requires the engine to be
running.
• Always avoid contact with hot metal
parts. Allow the components to cool
before working with, or around, them.
• Always operate the engine in a
well-ventilated area.
• Do not wear loose-fitting clothing,
hanging jewelry, watches or rings.
• Do not smoke.
• Do not work on the brakes or the clutch
unless you take the proper precautions
to avoid inhaling friction material dust.
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Maintenance

UNDER HOOD OVERVIEW - 6.7L DIESEL
E313700E313700
Engine compartment fuse box. See Fuses (page 200). A
Windshield washer fluid reservoir. See Washer Fluid Check (page 249). B
Automatic transmission fluid dipstick. See Automatic Transmission Fluid
Check (page 242). C
Secondary Cooling System Reservoir. See Engine Coolant Check (page 233). D
Engine coolant reservoir. See Engine Coolant Check (page 233). E
Secondary fuel filter. See Draining the Fuel Filter Water Trap (page 232). F
Engine oil separator. See Changing the Engine Oil and Oil Filter (page 226). G
Engine oil filler cap. See Engine Oil Check (page 224). H
Brake fluid reservoir. See Brake Fluid Check (page 244). I
Power steering fluid reservoir. See Power Steering Fluid Check (page 245). J
Air brake compressor. See Brake System Inspection (page 255). K
Engine oil dipstick. See Engine Oil Dipstick (page 224). L
Air cleaner assembly. See Changing the Engine Oil and Oil Filter (page 226). M
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Maintenance

UNDER HOOD OVERVIEW - 7.3L
E330964E330964
Engine compartment fuse box. See Fuses (page 200). A
Engine oil dipstick. See Engine Oil Dipstick (page 224). B
Windshield washer fluid reservoir. See Washer Fluid Check (page 249). C
Automatic transmission fluid dipstick. See Automatic Transmission Fluid
Check (page 242). D
Engine coolant reservoir. See Engine Coolant Check (page 238). E
Engine oil filler cap. See Engine Oil Check (page 225). F
Brake fluid reservoir. See Brake Fluid Check (page 244). G
Power steering fluid reservoir. See Power Steering Fluid Check (page 245). H
Air cleaner assembly. See Changing the Engine Air Filter (page 230). I
223
Maintenance

ENGINE OIL DIPSTICK - 6.7L
DIESEL
E249448
Minimum. A
Nominal. B
Maximum. C
ENGINE OIL DIPSTICK - 7.3L
E250320E250320
Minimum. A
Nominal. B
Maximum. C
ENGINE OIL CHECK - 6.7L
DIESEL
To check the engine oil level consistently
and accurately, do the following:1. Make sure the parking brake is on. Make
sure the transmission is in park (P) or
neutral (N).
2. Run engine until it reaches normal
operating temperature.
3. Make sure that your vehicle is on level
ground.
4. Switch the engine off and wait 15
minutes for the oil to drain into the oil
pan. Checking the engine oil level too
soon after you switch the engine off
may result in an inaccurate reading.
5. Open the hood. See Opening and
Closing the Hood (page 220).
6. Remove the dipstick and wipe it with
a clean, lint-free cloth. See Under
Hood Overview (page 222).
7. Replace the dipstick and remove it
again to check the oil level. See
Engine Oil Dipstick (page 224).
8. Make sure that the oil level is between
the maximum and minimum marks. If
the oil level is at the minimum mark,
add oil immediately. See Engine Oil
Capacity and Specification (page
292).
9. If the oil level is correct, replace the
dipstick and make sure it is fully seated.
Note:Do not remove the dipstick when the
engine is running.
Note: If the oil level is between the
maximum and minimum marks, the oil level
is acceptable. Do not add oil.
Note:The oil consumption of new engines
reaches its normal level after approximately
3,000 mi (5,000 km).
Adding Engine Oil
WARNING: Do not remove the filler
cap when the engine is running.
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Maintenance

Do not use supplemental engine oil
additives because they are unnecessary
and could lead to engine damage that may
not be covered by the vehicle Warranty.
To top up the engine oil level do the
following:
1. Clean the area surrounding the engine
oil filler cap before you remove it.
2. Remove the engine oil filler cap. See
Under Hood Overview (page 222).
Turn it counterclockwise and remove
it.
3. Add engine oil of the proper viscosity
and grade that meets Ford
specifications. See Engine Oil
Capacity and Specification (page
292). You may have to use a funnel to
pour the engine oil into the opening.
4. Recheck the oil level.
5. If the oil level is correct, replace the
dipstick and make sure it is fully seated.
6. Replace the engine oil filler cap. Turn
it clockwise until you feel a strong
resistance.
Note: Do not add oil further than the
maximum mark. Oil levels above the
maximum mark may cause engine damage.
Note:Make sure you install the oil filler cap
correctly.
Note:Soak up any spillage with an
absorbent cloth immediately.
Engine lubrication for severe
service operation
The following conditions define severe
operation for which engine operation with
SAE 5W-40 oil which meets Ford
specification, WSS-M2C171-F1, is
recommended. Oil and oil filter change
intervals will be determined by the
Intelligent Oil Life Monitor™ as noted
previously.
ENGINE OIL CHECK - 7.3L
1. Make sure that your vehicle is on level
ground.
2. Check the oil level before starting the
engine, or switch the engine off after
warm up and wait 10 minutes for the
oil to drain into the oil pan.
3. Remove the dipstick and wipe it with
a clean, lint-free cloth.
4. Reinstall the dipstick and make sure it
is fully seated.
5. Remove the dipstick again to check the
oil level.
Note: If the oil level is between the
maximum and minimum marks, the oil level
is acceptable. Do not add oil.
6. If the oil level is at the minimum mark,
immediately add oil.
7. Reinstall the dipstick. Make sure it is
fully seated.
Note:The oil consumption of new engines
reaches its normal level after approximately
3,000 mi (5,000 km).
Adding Engine Oil
WARNING: Do not add engine oil
when the engine is hot. Failure to follow
this instruction could result in personal
injury.
WARNING: Do not remove the filler
cap when the engine is running.
Do not use supplemental engine oil
additives because they are unnecessary
and could lead to engine damage that the
vehicle warranty may not cover.
1. Clean the area surrounding the engine
oil filler cap before you remove it.
2. Remove the engine oil filler cap.
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Maintenance

3. Add engine oil that meets our
specifications. See Capacities and
Specifications (page 288).
4. Reinstall the engine oil filler cap. Turn
it clockwise until you feel a strong
resistance.
Note: Do not add oil further than the
maximum mark. Oil levels above the
maximum mark may cause engine damage.
Note:Immediately soak up any oil spillage
with an absorbent cloth.
Engine Oil Pressure Warning Lamp
WARNING: If it illuminates when
you are driving do not continue your
journey, even if the oil level is correct.
Have your vehicle checked.
It illuminates when you switch
the ignition on.
If it illuminates when the engine
is running this indicates a malfunction.
Stop your vehicle as soon as it is safe to
do so and switch the engine off. Check the
engine oil level. If the oil level is sufficient,
this indicates a system malfunction. Have
your vehicle checked as soon as possible.
CHANGING THE ENGINE OIL
AND OIL FILTER
WARNING: Do not add engine oil
when the engine is hot. Failure to follow
this instruction could result in personal
injury.If your vehicle has a diesel engine, an
Intelligent Oil Life Monitor™ calculates the
proper oil change service interval. When
the information display indicates: OIL
CHANGE REQUIRED, change the engine
oil and oil filter. See Information
Displays (page 70).
The engine oil filter protects your engine
by filtering harmful, abrasive or sludge
particles and particles significantly smaller
than most available will-fit filters. See
Motorcraft Parts (page 290).
1. Unscrew the oil filter and oil pan drain
plug and wait for the oil to drain.
2. Replace the filter.
3. Reinstall the oil pan drain plug.
4. Refill the engine with new oil. See
Engine Oil Capacity and
Specification (page 295).
5. For diesel engines, you need to reset
the Intelligent Oil Life Monitor™. See
Information Displays (page 70).
Engine Lubrication for Severe
Service Operation
The following conditions define severe
operation:
• Frequent or extended idling such as
over 10 minutes per hour of normal
driving.
• Low-speed operation or stationary use.
• If the vehicle is operated in sustained,
ambient temperatures below -9°F
(-23°C) or above 100°F (38°C).
• Frequent low-speed operation, or
consistent heavy traffic less than
25 mph (40 km/h).
• Operating in severe dust conditions.
• Operating the vehicle off road.
• Towing a trailer over 1,000 mi
(1,600 km).
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Maintenance

CHANGING THE ENGINE AIR
FILTER - 6.7L DIESEL
Air Filter Restriction Gauge
WARNING: To reduce the risk of
vehicle damage and personal burn
injuries, do not start your engine with the
air cleaner removed and do not remove
it while the engine is running.
Note:Operating your vehicle in heavy
snowfall or extreme rain conditions may
allow excessive amounts of snow or water
into the air intake system. This could plug
or soak the air filter and cause the engine to
lose power or shut down.
E163372
The restriction gauge, on the upper housing
of the air filter assembly, measures the
vacuum inside the air filter. The more the
air filter is dirty or clogged, the higher the
vacuum reading.
Check the air filter restriction gauge
whenever you open the hood to perform
general engine maintenance or at least
every 7,500 mi (12,000 km). If you operate
your vehicle in extremely dusty conditions,
check and reset the gauge at least every
500 mi (800 km), or two weeks, whichevercomes first. Change the air filter when the
restriction gauge reads near the change
filter line and the gauge is yellow. If you
allow the restriction gauge to reach
maximum restriction, you can affect your
engine performance and fuel economy.
Note:Do not blow out the air filter element
with compressed air since the compressed
air could damage the filter paper.
Note:Do not rely on filter appearance
alone. A filter which appears to be dirty may
have several thousand miles (kilometers)
of life remaining.
E163373
After installation of the new filter element,
reset the gauge by pressing the reset
button on top of the gauge.
We recommend the following actions after
operating the vehicle up to 200 mi
(320 km) in heavy snowfall or extreme
rain:
• Snow: At the earliest opportunity, open
the hood and clear all the snow and ice
from the air filter housing inlet. Do NOT
remove the foam filter and reset the
air filter restriction gauge.
• Extreme rain: The air filter dries after
about 15–30 minutes at highway
speeds. At the earliest opportunity,
open the hood and reset the air filter
restriction gauge.
228
Maintenance

3. Rotate the drain counterclockwise until
the O-ring is visible. Allow the diesel
fuel conditioner module to drain for
approximately 25 seconds or until
clean fuel is observed. Rotate the drain
clockwise to tighten it. If no liquid
drains, there may be a clog in the drain.
Have the conditioner module serviced
by an authorized dealer.
4. Make sure that you fully tighten the
drain valve and then remove the
container from under your vehicle.
5. Restart the engine. If the Water in Fuel
Drain Filter message and light
continues to illuminate, have the fuel
system checked and repaired.
ENGINE COOLANT CHECK -
6.7L DIESEL
WARNING: Do not remove the
coolant reservoir cap when the cooling
system is hot. Wait 10 minutes for the
cooling system to cool down. Cover the
coolant reservoir cap with a thick cloth
to prevent the possibility of scalding and
slowly remove the cap. Failure to follow
this instruction could result in personal
injury.
WARNING: Do not put coolant in
the windshield washer reservoir. If
sprayed on the windshield, coolant could
make it difficult to see through the
windshield.
WARNING: To reduce the risk of
personal injury, make sure the engine is
cool before unscrewing the coolant
pressure relief cap. The cooling system
is under pressure. Steam and hot liquid
can come out forcefully when you loosen
the cap slightly.
WARNING: Do not add coolant
further than the MAX mark.
When the engine is cold, check the
concentration and level of the coolant at
the intervals listed in the scheduled
maintenance information. See Scheduled
Maintenance (page 319).
Note:Make sure that the coolant level is
between the MIN and MAX marks on the
coolant reservoir.
Note: Coolant expands when it is hot. The
level may extend beyond the MAX mark.
Maintain coolant concentration within
48% to 50%, which equates to a freeze
point between -30°F (-34°C) and -34°F
(-37°C). Coolant concentration should be
checked using a refractometer. We do not
recommend the use of hydrometers or
coolant test strips for measuring coolant
concentration.
Adding Coolant
WARNING: Do not add engine
coolant when the engine is hot. Failure
to follow this instruction could result in
personal injury.
WARNING: Do not remove the
coolant reservoir cap when the cooling
system is hot. Wait 10 minutes for the
cooling system to cool down. Cover the
coolant reservoir cap with a thick cloth
to prevent the possibility of scalding and
slowly remove the cap. Failure to follow
this instruction could result in personal
injury.
Note: Automotive fluids are not
interchangeable. Do not use coolant or
windshield washer fluid outside of its
specified function and vehicle location.
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Maintenance