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Old 03-24-2022, 05:16 PM   #221
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There have been many many folks here that have added the additional pully without any problems. There's a lot of give to the tensioner pulley, so there's no reason to change the belt length.

The belt has a long distance between the pulleys, and the new pulley will shorten that, and take out the "flutter" that's making the vibration. It'll probably take you longer to get your tools out than install the pulley.
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Old 03-24-2022, 08:38 PM   #222
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Here is the question I have. Hopefully not derail this post. If you were to add an additional pulley where the threaded bolt hole is to your right if your facing the engine, would the existing factory installed belt be to tight of a fit and go a tad larger or use existing factory spec belt?
I found that it does not deflect the belt enough to affect the belt size. The pulley just leans on the belt, keeping it stable.
.
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Old 03-25-2022, 10:07 AM   #223
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I found that it does not deflect the belt enough to affect the belt size. The pulley just leans on the belt, keeping it stable.
.
X2

When you install the 2nd pulley, you barely need to push the belt down to slide the pulley on. Takes a little more than pinky finger effort to push.
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Old 04-12-2022, 07:46 PM   #224
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Ever since it was new, the RV would have a fast rattle in the engine compartment when accelerating between 1800-2400 RPM, mostly 2nd gear, 30-45MPH. Sometimes it would happen for a second or two, other times for several seconds. Seems since it has got colder it doesn't happen as often. It wouldn't happen throughout the entire RPM distance, but it would almost always be there, usually ~2100RPM. Let go of the throttle or when it shifts and the rattle goes away. After 12k miles I finally decided to start trying to figure out what it was. Engine runs fine, no power loss, no mis-fires. Its not bad gas as I've gone through plenty of tanks. I stuck a gopro off the radiator and captured the below.

https://youtu.be/Oa6cr2dFkPE

You can hear the rattle start at :15 and then watch the belt vibrate erratically until you don't even see it for a few seconds. Rattle slows down and belt goes back to normal.

What is the cause of this? Bad belt? Bad tensioner? Pulley out of alignment? Something else? I'd think worst case is premature belt failure, right?

thanks-
I had this problem on my 2017 E450. Ford use to have a idler pulley on the top of the engine. In their great wisdom they removed it, I believe in the early 1970s. The engine still has the threaded bolt hole for the pulley. Add an idler pulley to the engine and the noise will be gone. It is an easy install No special tools, and nothing to remove.You will need to get the idler pulley bolt from Ford. That is the only place I could find it. The bolt comes in a two pack, and cost me about $10 approx. 2 years ago. You can get the idler pulley from any parts store. Advance Auto Parts had it for about $20 with a lifetime warranty. Autozone did not have the lifetime warranty. You will be asking for an idler pulley, and bolt as if you are replacing the one that is on it all ready. But you will be adding an additional idler pulley to the top of your engine.
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Old 04-16-2022, 02:53 AM   #225
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Getting ready to add the pully this weekend before our VA to Mt Rushmore trip in a few weeks. Hope this gets rid of that annoying sound.
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Old 04-16-2022, 06:44 AM   #226
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Getting ready to add the pully this weekend before our VA to Mt Rushmore trip in a few weeks. Hope this gets rid of that annoying sound.
We'd all like to hear if it worked for you. I bet it does.
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Old 04-17-2022, 03:15 PM   #227
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Easiest fix I’ve ever done on a vehicle. No more belt sound at 2000-2500 rpm’s and it’s so nice
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