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Old 03-29-2012, 03:54 PM   #1
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Belt tension

I just finished changing all three belts on my 454. How much deflection should there be in each belt.

1998 36ft Country Coach Magna #5499
Gillig chassis with a Detroit series 40
2002 F250 CC 7.3 PSD
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Old 03-29-2012, 06:49 PM   #2
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Originally Posted by mike brez View Post
I just finished changing all three belts on my 454. How much deflection should there be in each belt.

Mike, amount of deflection is dependent somewhat on where you make the check. I would shoot for around half an inch or less on the longest section of belt. My previous 454's had a pretty long A/C belt, and I had to run it pretty tight to eliminate whipping action along its longest length when the A/C was operating. Your belts should be rechecked for tightness after a couple of thousand miles, as they tend to stretch some. I personally would rather have the belts a little tight.

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Old 03-29-2012, 07:27 PM   #3
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If the belts don't squeal they are tight enough. There are a couple of different methods to check tightness but as Dieselclacker says they are all dependent on the distance between the pulleys. My rough test is in the longest stretch, on each belt, can I twist the belt a full 1/2 turn by hand. My acid test is always. no squeal tight enough. Stall the steering against the right or left stop and check the power steering belt for squeal. Turn on all electrical components you can find, (A/C on with fan on hi, lights on and hi beam, etc.) and rev the engine up and down a couple of times to check the alternator belt. If the fan belt is loose it will squeal when you rev the engine with all the electrical stuff off.
Wayne, Diane, & Bentley (our 22 lb. alarm system)
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