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Old 08-21-2017, 10:36 PM   #1
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Ford F53 chassis

I have a 2015 ford f53 chassis and when I hit 70-75 mph the motor squeals until I slow down. Is this a typical characteristic of a V10 ford ?
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Old 08-21-2017, 10:51 PM   #2
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Sounds like your motorhome has a common sense alarm installed.
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Old 08-21-2017, 10:54 PM   #3
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We'll probably need some more specifics to help. A given speed can be achieved in different gears and different RPMs so drawing the conclusion that the "motor" has some problem seems to be unlikely.

I believe all of the modern F53 have a speed limiter of 75mph. More to the point, why are you traveling so fast in the first place? Tire ratings are likely being exceeded, you're wasting fuel and it's unsafe.

The easiest solution seems to be to slow down.
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Old 08-22-2017, 05:30 AM   #4
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Quote:
I hit 70-75 mph
If its rpm related, the water-pump and radiator fan draw a lot of power off the serpentine bent at high rpms, its possible the belt could be doing the squealing.

I have an older F53 where I had a constant squealing, after a couple years of replacing every part in the system, I tried a different style belt, a Continental POLY-V/. This has grooves cut in crossways on the belt. Part # 4081102.

NOTE - This is a 110 inch belt. You will need to verify your belt length, Some say its a 100 some say its a 110.

http://www.2001mirada.com/chirp-chirp-chirp-the-sequel/

..
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Old 08-22-2017, 06:51 AM   #5
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Originally Posted by JFXG View Post
Sounds like your motorhome has a common sense alarm installed.
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Old 08-22-2017, 07:21 AM   #6
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I believe all of the modern F53 have a speed limiter of 75mph. More to the point, why are you traveling so fast in the first place? Tire ratings are likely being exceeded, you're wasting fuel and it's unsafe. .

I've had my '16 F53 to 85mph so that doesn't seem true.
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Old 08-22-2017, 07:33 AM   #7
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Quote:
I've had my '16 F53 to 85mph so that doesn't seem true.
Was this on a straight and level?

I've hit this speed on very, very rare occasion, i.e., descending a long straight hill with no oncoming traffic, when I'm near the bottom, rather than apply brakes, I've allowed the MH to build up speed. No power was applied, so can't tell if a limiter would kick in to prevent power from the engine.

I've never tried to get up to this speed on a straight and level. I usually hang around 60-65.

I don't think a tire rated at 75mph all the sudden turns into a death trap at 76 mph. However, Like I used to tell my students in flight training: "Once you move your operation outside the certified envelope, you've just become a test pilot."

How much safety margin is built into the tires and the rest of the structure. What were the conditions that established that margin.
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Old 08-22-2017, 07:37 AM   #8
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my 07 F53 has a limiter at 75
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Old 08-22-2017, 07:50 AM   #9
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I have a speed limiter in the right seat.
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Old 08-22-2017, 07:53 AM   #10
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I have a speed limiter in the right seat.


Lol!! Me too!!
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Old 08-22-2017, 08:19 AM   #11
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The speed limiter isn't really a speed limiter but an electronic RPM limiter. 3000 RPM when the transmission is in the top gear which is right around 75 MPH. It can vary between chassis models and production years based on transmission final ratio, differential ratio and wheel size. The limit can be change by reprogramming the engine management processor.

Back to the OP's original question. I don't think what ever is causing the noise in engine RPM related. You'll hit the same RPM count in lower gears. Next time it occurs try shifting into neutral for a few seconds, which will remove any torque from the drive train, and listen for a change. Have you notice the sound during hard acceleration? Maybe wind related? What ever it is it is not typical.
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Old 08-22-2017, 08:26 AM   #12
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Sounds like your motorhome has a common sense alarm installed.
I agree with #2 and #3


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Old 08-22-2017, 09:46 AM   #13
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See the same governor effect at 75 mph.
Have spun a but faster on long downhill on I40 in AZ but slowed down quickly.
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Old 08-22-2017, 10:11 AM   #14
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New belts and tensioning pulleys and idler pullys sokved all nise 64000 miles on all
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