Tentioning alt/fan belt on 2.5NA Diesel - Defender Source
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  #1  
Old June 5th, 2013, 09:17 PM
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Tentioning alt/fan belt on 2.5NA Diesel

Taking the old belt off and getting the new belt on seems very straight forward, however my Haynes Manual advises to test and set the tension on the belt. It didn't have further instructions on that as far as I could tell (though perhaps buried in another section).

How do I do this, and is a special tool required?

TIA.
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  #2  
Old June 5th, 2013, 09:22 PM
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No, just tighten like any other V-belt. They like to be on the tight side as the alternator has very little wrap.
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Old June 5th, 2013, 09:27 PM
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Quote:
Originally Posted by Red90 View Post
No, just tighten like any other V-belt. They like to be on the tight side as the alternator has very little wrap.
Ok. So one I have the alt pivot bolt loose and new belt in place, just rotate the alt back as far as I can an crank down that bolt to lock it in place?

Appreciate it!
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Old June 5th, 2013, 09:33 PM
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Quote:
Originally Posted by josh-man View Post

Ok. So one I have the alt pivot bolt loose and new belt in place, just rotate the alt back as far as I can an crank down that bolt to lock it in place?

Appreciate it!
No! There is a deflection spec. Not sure what it is. Tight but not as tight as you can.
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Old June 5th, 2013, 09:38 PM
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Originally Posted by evilfij View Post

No! There is a deflection spec. Not sure what it is. Tight but not as tight as you can.
Is this gonna be a trial and error thing for me then? I've never replaced a belt so bear with me on my likely obvious questions.
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Old June 5th, 2013, 11:10 PM
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Is this gonna be a trial and error thing for me then? I've never replaced a belt so bear with me on my likely obvious questions.
No problem I just wanted to make sure you did not mess it up. Over tight kills the bearings.
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Old June 5th, 2013, 11:25 PM
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Originally Posted by evilfij View Post

No problem I just wanted to make sure you did not mess it up. Over tight kills the bearings.
Thx man. Now how to figure out what is too loose vs too tight?!!
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Old June 5th, 2013, 11:31 PM
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Quote:
Originally Posted by josh-man View Post

Thx man. Now how to figure out what is too loose vs too tight?!!
Don't stress to much, get it all back together with a loose alt bolt pull alternator to where you get about a half an inch of play on the belt then tighten down.
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Old June 5th, 2013, 11:31 PM
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In the NAS repair manual there is a spec which shows how much deflection (ie how much the belt moves on the long part). Not sure on your truck.
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Old June 6th, 2013, 03:52 AM
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Too loose is easy. If the charge light is on, too loose. If the belt squeals, too loose.

Too tight? Need to know the deflection speck.

Mike.

Quote:
Originally Posted by josh-man View Post
Thx man. Now how to figure out what is too loose vs too tight?!!
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Old June 6th, 2013, 09:28 AM
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Originally Posted by Brewie212 View Post
Don't stress to much, get it all back together with a loose alt bolt pull alternator to where you get about a half an inch of play on the belt then tighten down.
Thanks Brian. Appreciate it.
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  #12  
Old June 6th, 2013, 10:07 AM
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you should be able to twist the belt 1/4 turn at the longest run .... i takes time but you get the feel of it
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Old June 6th, 2013, 10:27 AM
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OK, seem to be narrowing it down to figuring out how to NOT overtighten!
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Old June 6th, 2013, 10:50 AM
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Quote:
Originally Posted by josh-man View Post
Taking the old belt off and getting the new belt on seems very straight forward, however my Haynes Manual advises to test and set the tension on the belt.
Download the genuine workshop manual. It says...

Quote:
Tighten the clamp bolt and with thumb pressure, check the belt tension between the fan
and alternator pulleys which should be 7 to 9 mm (3/16 to 1/4 in) at the mid-point.
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Old June 6th, 2013, 11:15 AM
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Quote:
Originally Posted by Red90 View Post
Download the genuine workshop manual. It says...
Thanks, Red. Comes back to my original question of how to perform that test- is it just a "by feel" test?

REALLY appreciate the assist with this.
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  #16  
Old June 6th, 2013, 11:22 AM
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Yes, just by feel. "thumb pressure".
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  #17  
Old June 6th, 2013, 01:13 PM
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cool. I think EVEN I can handle that LOL. Appreciate it!
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