Forum Discussion

lj2654's avatar
lj2654
Explorer
May 04, 2018

Diesel Pusher Air Filter change

I was wondering how to really know when to change an air filter on a CAT engine.

I have the vacuum gauge that is supposed to give you the info but how reliable are they?

The filter for my engine is a large canister that has to be changed out but its more awkward to do than hard.

I can remove the lower hose and visibly see it but that doesn't tell me anything!
Class A
  • wolfe10's avatar
    wolfe10
    Explorer
    May 04, 2018
    Air filters are replaced for TWO reasons:

    1. Restriction, as indicated by air filter minder reading.

    2. Age. Made of paper and resin, they deteriorate. Three years is a reasonable "safe life".

    And, the air filter minder needs to be tested annually. Pull off the rubber hose that goes from intake to filter minder and suck on it. The filter minder should peg at max restriction and hold that reading until you push the release button. Truly a 1 minute operation.

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