Fan Noise?
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Fan Noise?
I searched and didnt really find what I was looking for so if this thread already exists just point me there and I'll move on along.
Have an 02 F250 just recently removed big tires and wheels which is probably the reason I have never heard this before or maybe it just started. Tuesday while driving home pulling a travel trailer about 6K lbs and 97 degrees outside I kept hearing what sounded like a fan coming on. Didnt really seem to be RPM related as I would be holding a pretty consistent 70mph. The noise would be there for a little while and cut off. It sounded more like a fan coming on and off rather something to do with the turbo but I cant be certain. Any ideas what this might be that Im hearing.
Have an 02 F250 just recently removed big tires and wheels which is probably the reason I have never heard this before or maybe it just started. Tuesday while driving home pulling a travel trailer about 6K lbs and 97 degrees outside I kept hearing what sounded like a fan coming on. Didnt really seem to be RPM related as I would be holding a pretty consistent 70mph. The noise would be there for a little while and cut off. It sounded more like a fan coming on and off rather something to do with the turbo but I cant be certain. Any ideas what this might be that Im hearing.
Senior User
Joined: Dec 2008
Posts: 237
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From: Melbourne, Florida
Seriously, runnin 70 with a 6k trailor at 97 degrees will definitely engage your fan clutch and you quite possibly didnt notice this with tire noise, and the fan noise is independant of your 6637, which I understand has an additional noise all it's own.
Cargo Master
Joined: Jan 2001
Posts: 2,726
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From: Slatington, PA
The fan will cycle on and off as needed and usually does while towing, especially if you've got the a/c going at the same time. It sounds like a kind of roaring, right? These things move a lot of air and make some noise.
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Yup, thats normal. Just the fan doing what it does. Don't be afraid to ask about any other noises. These trucks make plenty of them
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Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Fan Clutch Test ...Maximum Speed Requirement...
1) Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille. This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.
2) Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved.
3) Place the climate control function selector switch in the MAX A/C position and the blower motor switch in the HI position.
4) Adjust the strobe to 3,600 rpm for 7.3L diesel engines and adjust the engine speed until the strobe light flash and the water pump pulley mark are synchronized.
5) NOTE: The temperature of the air hitting the fan clutch should be above 96°C (205°F) for maximum fan speed.
6) If the fan blade speed is less than 2,850 rpm on 7.3L engines, install a new fan clutch.
Here's the complete version...
...This help? found this out of my Service Manual ...Fan Clutch Test
Spin the fan blade (8600) by hand. A light resistance should be felt. If there is no resistance or very high resistance, the minimum and maximum fan speeds must be checked as follows:
Fan Clutch Test—Minimum Speed Requirement
Use a suitable marker to mark the water pump pulley (8509), one of the fan blade retaining bolts and the crankshaft pulley (6312).
Connect a tachometer to the engine.
Install a throttle adjusting tool.
Connect the Digital Photoelectric Tachometer.
WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.
Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved.
Operate the strobe light at 4,320 rpm for 5.4L and 6.8L engines and 3600 rpm for 7.3L diesel engines, and aim it at the water pump pulley. Adjust the engine speed until the light flash and the water pump pulley mark are synchronized.
Aim the strobe light at the fan blade bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
The fan blade speed must not be greater than 1,900 rpm on 5.4L engines and 2,000 rpm on 6.8L and 7.3L engines.
Turn the engine off.
If the fan blade speed was greater than 1,900 rpm (on 5.4L) (on diesel engines and 6.8L, 2,000 rpm), install a new fan clutch (8A616).
Fan Clutch Test—Maximum Speed Requirement
Perform Steps 1 through 5 of the Fan Clutch Test—Minimum Speed Requirement.
NOTE: The temperature of the air hitting the fan clutch should be above 96°C (205°F) for maximum fan speed.
Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille (8200). This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.
Place the climate control function selector switch in the MAX A/C position and the blower motor switch in the HI position.
Adjust the strobe to 4,320 rpm for 5.4L and 6.8L engines and 3,600 rpm for 7.3L diesel engines.
WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.
Start the engine and adjust the engine speed until the strobe light flash and the water pump pulley mark are synchronized.
Aim the strobe light at the fan blade retaining bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
If the fan blade speed is less than 3,600 rpm on 5.4L engines and 3,500 rpm on 6.8L engines, 2,850 rpm on 7.3L engines, install a new fan clutch.
Spin the fan blade (8600) by hand. A light resistance should be felt. If there is no resistance or very high resistance, the minimum and maximum fan speeds must be checked as follows:
Fan Clutch Test—Minimum Speed Requirement
Use a suitable marker to mark the water pump pulley (8509), one of the fan blade retaining bolts and the crankshaft pulley (6312).
Connect a tachometer to the engine.
Install a throttle adjusting tool.
Connect the Digital Photoelectric Tachometer.
WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.
Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved.
Operate the strobe light at 4,320 rpm for 5.4L and 6.8L engines and 3600 rpm for 7.3L diesel engines, and aim it at the water pump pulley. Adjust the engine speed until the light flash and the water pump pulley mark are synchronized.
Aim the strobe light at the fan blade bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
The fan blade speed must not be greater than 1,900 rpm on 5.4L engines and 2,000 rpm on 6.8L and 7.3L engines.
Turn the engine off.
If the fan blade speed was greater than 1,900 rpm (on 5.4L) (on diesel engines and 6.8L, 2,000 rpm), install a new fan clutch (8A616).
Fan Clutch Test—Maximum Speed Requirement
Perform Steps 1 through 5 of the Fan Clutch Test—Minimum Speed Requirement.
NOTE: The temperature of the air hitting the fan clutch should be above 96°C (205°F) for maximum fan speed.
Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille (8200). This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.
Place the climate control function selector switch in the MAX A/C position and the blower motor switch in the HI position.
Adjust the strobe to 4,320 rpm for 5.4L and 6.8L engines and 3,600 rpm for 7.3L diesel engines.
WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.
Start the engine and adjust the engine speed until the strobe light flash and the water pump pulley mark are synchronized.
Aim the strobe light at the fan blade retaining bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
If the fan blade speed is less than 3,600 rpm on 5.4L engines and 3,500 rpm on 6.8L engines, 2,850 rpm on 7.3L engines, install a new fan clutch.
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jpm2591
1999 - 2003 7.3L Power Stroke Diesel
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Oct 21, 2005 02:25 PM
