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CAC hose solution
Special thanks needs to go to Bill F and Karl L. because this problem has apparently been resolved and awaits a sign off at Prevost, plus an updated CAT base. Both guys kept the topic in the forefront.
Bill Jensen who is retiring at the end of this month, and who is going to be sorely missed relayed the following information.
It is a little confusing and I think I have the numbers correct, but within a short period of time (maybe a couple of weeks) all branches and the parts guys will be up to speed on this hose isse.
First, all hoses specified are going to have the 500 degree rating, including the cold side. So any future hose replacements are going to eliminate any concerns about the hose temperature ratings. That is a huge improvement and is great news.The only thing we all have to be aware of is all hoses are going to be BLUE. That’s right, Volvo has 500 degree hoses and they are blue so once this change goes into effect the color will no longer be used to determine the acceptability of the hose for the application. The part numbers are now going to have the temperature rating so if in doubt check with Prevost parts and they can verify the temperature rating.
It could be confusing to those of you who have had recent hose replacements and got blue hoses. The only key to acceptability is to review your paper work or look for the part number on the hose. Here is information I got from Bill regarding part numbers, but please verify the accuracy with the parts guys if you feel the need to change hoses.
Volvo 70396486, 7039865, and Prevost 531471 are all 500 degree rated hoses. If you have blue hoses on the hot side, if they have any of these numbers you have 500 degree rated hoses. If you have 531469 you have a 350 degree rated hose.
If there is any doubt in your mind regarding the hose rating I would urge you to order replacement 500 degree hoses and just keep them with you in your spare parts bin if you don’t want to change hoses at this time.
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8 Replies
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Jon,
You stole my thunder…. Bill called and left a message for me this afternoon with essentially the same information. Cudos really should go to you to raising this issue in the first place. I didn’t post anything as I sent an Email to the Director of North American Service Randy Castillo whom I spoke to a couple of times and requested that we get some type of email or memo that we can post here so we get everything right and all the correct part numbers etc and then a member could bring that in when a CAC repair was needed to eliminate any potential issues. I am a little suspect of the 531471 being a 500 degree hose as I have one of those that was failing at the seam on the hot side.
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As mentioned in the post, verify the temperature rating of the hoses. The numbers above were provided by Bill Jensen but I may have misinterpreted what he said.
It is my understanding when service centers are briefed on this all the correct numbers will be made available.
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Well done Karl & Bill and for persisting until you achieved the desired result. Now if you can just get Mr Jensen to sign off on the cheapo CAC and Crapco mirrors before he retires you’ll have PC friends for life. :))
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Don’t I wish. It burns my butt that I have to put my second CAC in this bus.
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That’s a secondary issue, and you are not the only one who has had the bad CAC replaced with another CAC of the same manufacturer. I doubt if there is any solution to that.
That problem is a good example of why it is important to not ever leave the coach for service and expect it to be done correctly. There is no substitute for remaining with a coach while it is serviced and watching everything going on, making notes, asking questions, etc.
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We “second” that. While you may think babysitting your coach while in service bay is a waste of time, it’s better to be present as Jon said to make sure work done is correct
The second thing we do is to rectify the amount that will be charged on the bill before leaving a Prevost service center.
Nothing is more frustrating than having to make a phone call two weeks later when the “bill” shows for incorrect billing, after pulling the spouse from the ceiling, who’s yelling we can’t keep spending money like this!! So for peace and harmony in the bus on the road after a service visit, we make sure we know what will be on the invoice when it arrives. -
As a follow up to this thread and the information provided above, color of hoses is not indicative of their rating when supplied by Prevost.
The manufacturer has provided the following information regarding Prevost part number 531467:
The hose is constructed of silicone rubber with m-Aramid fiber reinforcement.
The temperature rating of the hose is:
+220 Centigrade (for continuous application)
+260 Centigrade is allowed for short excursions, cumulatively adding to no more than 10% of the parts service lifetime.
The continuous operating temperature translates to 428 degrees F, with short excursions being 500 F.
I have no means at this time to measure the percentage of time the turbo air discharge exceeds 428 degrees so if anyone has an EGR engine and Silverleaf or a reader we would appreciate some data to reflect what percentage of an hour has turbo air discharge temps exceed 428.
If as an owner if you want total peace of mind there is no reason why you cannot use the red/orange colored hoses available on line or at truck parts houses for the hot side of the charge air system. Just make sure the hose is long enough to be double clamped.
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This is the CAC hose from Prevost Jon is talking about. Jeff seems to be replacing a lot of these, they fail near the clamp as shown.
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