Community Forums

aidachry2003 · 09-24-2016, 08:08 AM

Has anyone replaced their AC belt on 2003 Monaco diplomat Cummins 330 engine rear radiator? If so how did you get the belt over the fan, I have tried can't seem to get belt over the fan. Thanks in advance for all your help

Skip426 · 09-24-2016, 11:04 AM

There have been a couple of posts about this and the problem may be that the adjuster for the belt tension wasn't properly installed , resulting in too short a belt , when a belt that will go over the fan is used the compressor won't adjust to get the belt tight.
I'll try and track the post down, in the mean time could you post a picture of your belt adjuster.

Stretch · 09-24-2016, 12:41 PM

May need to take fan off of the pulley first.

nodine · 09-25-2016, 05:14 AM

Quote:

Originally Posted by aidachry2003

Has anyone replaced their AC belt on 2003 Monaco diplomat Cummins 330 engine rear radiator? If so how did you get the belt over the fan, I have tried can't seem to get belt over the fan. Thanks in advance for all your help

Oops, I just saw you are referring to the AC compressor belt. Our coach only has one large belt that turns everything. If you have the two belt configuration then your only choice may be to remove the fan from the pulley.

If the belt is to short to reach the tip of the fan blades and contacts the center fan shaft then Skip may be correct in his assessment. We have changed the belt on our 2006 Diplomat with the ISL and were able to get the belt over the fan. The trick is to do one fan blade tip at a time until the belt is all the way over the fan. Make sure you have the belt off all of the pulleys and the only interference is the fan center shaft and pulley. It is a difficult job and there is almost no room to work. We did not attempt to remove and replace the belt from inside the coach and did the job completely from below. We did not even remove the engine covers. If you have large arms this may be a problem for you.

It also helps to purchase a long handle swivel head 1/2 drive ratchet like the one in this link. We were able to take the tension off the idler pulley and move that long handle under the air intake tube keeping the tension off the idler while we worked. Makes the job considerably easier. Hope you can do the same thing.

1/2 in. Drive Professional Flex Head Long Handle Ratchet

Good luck,

Bob

Skip426 · 09-25-2016, 10:37 PM

Here's a diagram and picture of the correct compressor , adjuster mount , I can't find the post that listed the slightly longer belt number.

RobRoy · 09-26-2016, 07:49 AM

Quote:

Originally Posted by nodine

Oops, I just saw you are referring to the AC compressor belt. Our coach only has one large belt that turns everything. If you have the two belt configuration then your only choice may be to remove the fan from the pulley.

If the belt is to short to reach the tip of the fan blades and contacts the center fan shaft then Skip may be correct in his assessment. We have changed the belt on our 2006 Diplomat with the ISL and were able to get the belt over the fan. The trick is to do one fan blade tip at a time until the belt is all the way over the fan. Make sure you have the belt off all of the pulleys and the only interference is the fan center shaft and pulley. It is a difficult job and there is almost no room to work. We did not attempt to remove and replace the belt from inside the coach and did the job completely from below. We did not even remove the engine covers. If you have large arms this may be a problem for you.

It also helps to purchase a long handle swivel head 1/2 drive ratchet like the one in this link. We were able to take the tension off the idler pulley and move that long handle under the air intake tube keeping the tension off the idler while we worked. Makes the job considerably easier. Hope you can do the same thing.

1/2 in. Drive Professional Flex Head Long Handle Ratchet

Good luck,

Bob

Although his does not apply to my coach, I would agree with your assessment on how to do this after looking at his pic.

We would run across this clusterstook setup in automotive service now and then....fun fun.

I would also be very careful when tightening that belt without a belt gage and that type of adjustment setup.

With that set up it's very easy to over tighten and destroy any pulley bearings involved such as his A/C compressor bearings and the likes.

If his setup is like pictured in this thread and is a V-belt, a good rule of thumb to tightening the belt without a gage is with the belt placed between your fore finger and you thumb you should be able to rotate the belt 90% using your fore finger and thumb using firm pressure ...however a belt gage is the proper way.

67fisher · 09-27-2016, 01:51 PM

If the new belt is the correct one it WILL go over the fan blade tips. Tight, but it will go. you do not have to remove the serpentine belt.

aidachry2003 · 09-28-2016, 02:47 PM

Thanks all for your input will take picture when I recover from minor surgery

Skip426 · 09-28-2016, 05:40 PM

Quote:

Originally Posted by aidachry2003

Thanks all for your input will take picture when I recover from minor surgery

Take your time , we'll be here when your fully recovered.

I will keep looking for the correct belt number.

slemnah · 09-28-2016, 06:42 PM

Are you sure that the belt goes over the fan? It may only run from the crank pulley directly to the a/c compressor. The picture that someone posted shows this.
Steve
05 Panther

slemnah · 09-28-2016, 06:45 PM

Quote:

Originally Posted by Skip426

Here's a diagram and picture of the correct compressor , adjuster mount , I can't find the post that listed the slightly longer belt number.

I am sorry, not the picture but the diagram shows at the belt just goes to the compressor. The picture shows it going over the fan and onto the fan pulley. That belt should be more than long enough to go over the fan. This is why I have a side radiator!

Steve
05 Panther

Skip426 · 09-28-2016, 11:18 PM

Quote:

Originally Posted by slemnah

Are you sure that the belt goes over the fan? It may only run from the crank pulley directly to the a/c compressor. The picture that someone posted shows this.
Steve
05 Panther

Here's the same belt set up , on a side radiator coach, serpentine belt , drives the " fan mount idler " then a V belt runs up to the A/C compressor.

Skip426 · 09-29-2016, 12:27 AM

Finally found the post, search engine didn't like my spelling.

would only accept A/C and not air conditioner.

In post 11 on this link, Hoolian gives the correct belt length as 42.5", after the adjuster is properly installed.

http://www.irv2.com/forums/f123/a-c-...sb-213479.html