I noticed on my c7 cat motor that the gauge that shows whether the air is being restricted to the motor was up high in the glass and a mechanic suggested that I change the filter. The old one looks very clean but I changed it anyway. Problem solved right? Nope. The next time I went for a trip I checked the gauge and its right back up where it was before. Its about 3/4 of the way up the glass. Is this the correct place for the gauge to be or do I have another restriction somewhere.Is this normal for the gauge to be so high in the glass?Thank you Bob

No, I don't think so. Mine is normally at 15? You did reset it after the change right?

yes I reset the gauge. Maybe I should check the hose that delivers air. Could be a mouse built a nest? I don't know. I am just checking with others on here to see if their air restriction gauge runs high in the glass or does it stay low.On the hills my motor seems to not have much power. But this is my first diesel pusher and it is a little motor. It just seems to bog down on hills fairly quick.Thanks for your replyBob

Bob,The AIR FILTER MINDER GAUGE reads total restriction in the engine's air intake system, so indeed that means from side of coach opening, the (often too long) flexible hose to the air filter, hose/piping from air filter to turbo.I would start by verifying that the flexible hose from side of coach to air cleaner is as short and straight as possible. I have inspected coaches where the chassis maker supplied hose that allows some flexibility in where the air intake is mounted is NOT shortened and routed straight. Cutting out 2' of flexible hose is a pretty easy and inexpensive "fix".Some coach makers cut too small a hole in the side of the coach. That would be next on my check list.After that, if you still have excessive restriction, see if you have room for a larger air filter housing with the same outlet location and size.

bobpam54 wrote:I noticed on my c7 cat motor that the gauge that shows whether the air is being restricted to the motor was up high in the glass and a mechanic suggested that I change the filter. The old one looks very clean but I changed it anyway. Problem solved right? Nope. The next time I went for a trip I checked the gauge and its right back up where it was before. Its about 3/4 of the way up the glass. Is this the correct place for the gauge to be or do I have another restriction somewhere.Is this normal for the gauge to be so high in the glass?Thank you BobBob, I was in the same predicament as you a while ago. I too looked at my restriction gauge and it was about in the middle, if not a tad higher. Well, I figured no one had changed it prior to us owning the coach so, time for a change-out of the air cleaner. Well, like yours, ours looked like it was put in the day before. So, off to the air cleaner store. I put a new one in and, took the big beast for a little drive. I got back, backed her into her cave and, got out and took a look at the gauge. Well, again like yours, it was right back where it was prior to the change-out to the new one. Hmmmmmmm. So, I did what Brett suggested and looked for possible issues in the intake system. NONE! All of my hoses, routing and components to that intake side are about as efficient as they can be, without removing all of it and just having an opening in the side of the air cleaner can. I've reset that restriction gauge several times and, it always comes back to the same spot. The engine runs good, get's me in the neighborhood of about 7-8 mpg, has fair to good power pulling a 5300 lb. toad. So, if there is a problem, at least with mine, I have no idea where it would be. Scott

Could be a bad gauge or collapsing hose with higher boost.

air intake for c7 cat | Good Sam Community

wolfe10
Explorer
Dec 03, 2014
Bob,

The AIR FILTER MINDER GAUGE reads total restriction in the engine's air intake system, so indeed that means from side of coach opening, the (often too long) flexible hose to the air filter, hose/piping from air filter to turbo.

I would start by verifying that the flexible hose from side of coach to air cleaner is as short and straight as possible. I have inspected coaches where the chassis maker supplied hose that allows some flexibility in where the air intake is mounted is NOT shortened and routed straight. Cutting out 2' of flexible hose is a pretty easy and inexpensive "fix".

Some coach makers cut too small a hole in the side of the coach. That would be next on my check list.

After that, if you still have excessive restriction, see if you have room for a larger air filter housing with the same outlet location and size.
bobpam54
Explorer
Dec 03, 2014
yes I reset the gauge. Maybe I should check the hose that delivers air. Could be a mouse built a nest? I don't know.
I am just checking with others on here to see if their air restriction gauge runs high in the glass or does it stay low.
On the hills my motor seems to not have much power. But this is my first diesel pusher and it is a little motor. It just seems to bog down on hills fairly quick.
Thanks for your reply
Bob
Valkyriebush
Explorer II
Dec 03, 2014
No, I don't think so. Mine is normally at 15? You did reset it after the change right?

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