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Thread: Donaldson Air Filter Restriction Indicator

  1. 18th April 2015, 07:06 PM #1
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    flagg
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    Donaldson Air Filter Restriction Indicator

    Hi All,

    How many kPa is the standard air filter restriction indicator? I blow mine with brand new filters, and then I realised that ages ago I replaced it after a ham-fisted removal of the filter housing broke it.. The one I have triggers at 20inches / 4.98 kPa .. today I was wondering if my filters are fine and it is just that I didn't replace the broken one with the correct rating!

    Cheers
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
    Brutus: 1969 109 ExMil 2a FFT (loved and lost)
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  2. 28th May 2015, 06:42 PM #2
    Ancient Mariner
    Ancient Mariner is offline Wizard
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    Just seen your pic of bleed valve reminded me I didn't reply about your restriction indicator .My indicator trips within a couple of Ks with a Donaldson type precleaner but never trips with the ram type scoop Have a look Defender Onheit page 5 this section post 56

    Noel
    Last edited by Ancient Mariner; 28th May 2015 at 06:48 PM. Reason: more stuff
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  3. 28th May 2015, 10:27 PM #3
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    flagg
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    Thanks Noel,

    So Steve trips his 25" with 15 psi.. no wonder I'm tripping my 20" at 20psi!

    Does anyone know the maximum allowable restriction for a 4bd1-T? Donaldson have a 30" indicator..
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
    Brutus: 1969 109 ExMil 2a FFT (loved and lost)
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