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Old 11-15-2021, 10:42 AM   #1
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Lightbulb C7 water pump belt

Hello everyone, I am 69chevelle , my first new car !! , I recently purchased a 2007 Tiffin Phaeton with C-7 Cat. The little V- belt on the water pump is loose and needs adjustment. I slid under the unit yesterday and looks like it will be a tough job to get to the adjuster bolt and I assume there is also a bolt that hold the adjuster tight when you get the tension right ? Didnít remove doghouse up above yet because it looks like going down from the top might be even harder to reach and adjust. Past owner replaced serpentine belt a year ago and looks and feels good, and the water pump belt I need to adjust looks to be in good shape if I can adjust ? Advise from you experts , knuckle skinners , or beginners is appreciated. Thanks 69 Chevelle
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Old 11-15-2021, 01:44 PM   #2
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Quote:
Originally Posted by 69chevelle View Post
Hello everyone, I am 69chevelle , my first new car !! , I recently purchased a 2007 Tiffin Phaeton with C-7 Cat. The little V- belt on the water pump is loose and needs adjustment. I slid under the unit yesterday and looks like it will be a tough job to get to the adjuster bolt and I assume there is also a bolt that hold the adjuster tight when you get the tension right ? Didnít remove doghouse up above yet because it looks like going down from the top might be even harder to reach and adjust. Past owner replaced serpentine belt a year ago and looks and feels good, and the water pump belt I need to adjust looks to be in good shape if I can adjust ? Advise from you experts , knuckle skinners , or beginners is appreciated. Thanks 69 Chevelle

I have a 2006 Phaeton, I had changed the belts recently on my C7 @ 50k miles, I did it through the access panel where the air cleaner is. I had to remove the air cleaner and the pipe that goes to the intercooler. The serpentine belt has to come off first and moved out of the way, then there are two bolts that have to be loosened for that water pump idler pulley to move freely, not easy to access. Careful not to break those bolts off! Even after I replace my belt it seems to run loose with no problem. If I were you I would leave it as is and carry a spare belt.
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Old 11-15-2021, 01:55 PM   #3
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Suspect you will have a lot better accessibility from below.


There is both a pivot bolt and adjustment bolt. And a square hole to allow a ratchet to move the adjustment.


And, yes, that belt shouldn't be loose-- could cause overheating.


Correct-- very little clearance.
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Old 11-15-2021, 02:36 PM   #4
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My 03 Journey with A C7 was loose so under I went. The pivot bolt broke so the rear bumper radiator and inner cooler had to come off in order to get at the thing and drill and tap it. When I took the rad off the bottom was shot/rotted. The old girl wasn't overheating but the rad was sad. So new after market rad, clean and paint the inner cooler along with belt tensioner, idler pulley, water pump pulley, new AC compressor, rebuilt alternator. To include all rad hoses and clamps. So if your lucky enough to get the pivot bolt loose never seized is cheep.
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Old 11-15-2021, 03:31 PM   #5
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Yes, you could probably go from underneath but the bolts are a lot easier to access and loosen from the side. When I did mine I took off the serpentine tensioner also and the bolts are right there. Had to do a little back-and-forth action and was able to get them loose enough to adjust. A little more time consuming but far less than removing the radiator to get a broken bolt out.
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Old 11-15-2021, 03:37 PM   #6
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If those two bolts are tight, use a good penetrating oil rather than breaking them.


Be sure to protect the belt from the penetrating oil. Maybe encase the belt in aluminum foil??


No question, if the coach has been driven on salted roads it will be alot tougher to free them up.


If the belts are original, a good time to change both belts and the automatic tensioner for the serpentine belt.
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Old 11-15-2021, 04:11 PM   #7
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'69 Chevelle,
(nice cars by the way)
I've had the back section of my C-7 apart a time or two for some decent maintenance etc. Different coach builders build in different clearances and allowances for maintenance in all these coaches. What's easily done in some coaches, is a serious pain in the a$$ in other coaches. Soooo, with all that being said, from the zillion photos I've taken of the work I've done, I can only find one that gives you at least an idea of the arrangement you're up against.

Others have stated they've had issues with one or the other of those two bolts that retain the adjustment. Maybe I got lucky with mine. Both came out without issues. Anyway, here's what you're up against, if you haven't seen them already. Good luck.
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Old 11-15-2021, 06:14 PM   #8
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Tightening that water pump belt in my engine was a real PIA. I couldn't use the square hole due to it being blocked, so I had to use a come along attached to the tensioner and a fence post just so I could get the belt tight enough and still give me room to get to the to bolts.
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Old 11-15-2021, 08:15 PM   #9
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As stated bots can be difficult to loosen because of location and corrosion. I believe its the outside bolt goes through the front cover and is open on the block side. When I say open the end of the bolt I mean the end with the threads is open to the elements. So its critical to spray a thread rust buster on that end. If you aren't having problems with the belt right now, spray with a rust buster then use the coach then respray several times before trying to loosen. Its a real PIA and expensive if you break the bolt off.
Take your time with it. Safe Travels
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Old 11-20-2021, 12:45 PM   #10
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Red face Water pump belt C-7

Quote:
Originally Posted by FIRE UP View Post
'69 Chevelle,
(nice cars by the way)
I've had the back section of my C-7 apart a time or two for some decent maintenance etc. Different coach builders build in different clearances and allowances for maintenance in all these coaches. What's easily done in some coaches, is a serious pain in the a$$ in other coaches. Soooo, with all that being said, from the zillion photos I've taken of the work I've done, I can only find one that gives you at least an idea of the arrangement you're up against.

Others have stated they've had issues with one or the other of those two bolts that retain the adjustment. Maybe I got lucky with mine. Both came out without issues. Anyway, here's what you're up against, if you haven't seen them already. Good luck.
Scott
thanks Scott, I will take your advice, and look it over close . Maybe going in from the side is an option ?
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Old 12-02-2021, 01:31 PM   #11
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I have done this job twice and both times it requires two people... one from the top and one from the bottom. Remove the serpentine belt and tensioner. Then you need to loosen the two bolts on the water pump tensioner. I believe you need an extension on the socket to access the one that is close to the pulley. It's very tight. Remove belt, reinstall, add the extension and use that apply tension to the tensioner while the other person tightens the belt. After it's tightened, then torque the remaining bolt left. You really don't want to go overboard with the torque on these two bolts.
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