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Eng Fuel Filters Man CR900

Discussion in 'Engines' started by CSkipR, Mar 18, 2012.

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  1. Capt Ralph

    Capt Ralph Senior Member

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    What original filters are you not using?
    Did you at least use new O rings and gaskets (oiled)?
  2. Nicol

    Nicol New Member

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    Am using fleegard filters and yes am using new O rings
  3. Capt J

    Capt J Senior Member

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    Check the crush washer on the secondary bleed screws. Did you lubricate the new gaskets with oil before installing the filter and are you sure the old gaskets came out?
  4. Capt Ralph

    Capt Ralph Senior Member

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    Interesting. Fleetguard is good stuff. Should not be an issue.
    If this is a new problem since your filter service, then there is a leak somewhere.

    I know I always have to wrestle with the secondarys to get the plastic caps back on. I remember cracking a cap getting one off. On SeaRays there is not much vertical room to even reach an arm to the far filter.

    If your E/R is like these, it could be easy to damage an O ring or crack a plastic cap. You may never see a fuel leak if your tanks are low.

    Also, look down into the valley between the heads. You may have to remove the cover and tilt up the computer. All those tubes and hoses and pumps are down there. Your looking for a fuel puddle.

    I worked on a leak in there once, never again.
  5. Nicol

    Nicol New Member

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    Yes I've done all of this no problem. Anyways I'll have another look again , perhaps one of them got stuck somewhere
  6. Nicol

    Nicol New Member

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    Sorry what
    Sorry, what do you mean by E/R?
    Tomorrow I'll have a look regarding the puddle and let you know what I find.
  7. Capt J

    Capt J Senior Member

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    I don't remember any plastic caps of any sort on MAN 900 secondaries. The Man Hummel primaries have the plastic bowl and yeah, they need a lot of torque to tighten. Also sometimes the water sensor will crack where it goes into the plastic bowl and allow air to get sucked up when the motor is running.

    Are both motors airlocking or just one? If it's both, are you sure the Fleetguard filters you got are the correct ones?
  8. Nicol

    Nicol New Member

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    Both are air locking. There's two liters on the engine. It's in a plastic canister. You need to unscrew the top to remove the filters. The make is Hangst. Could this be the problem?
  9. Capt J

    Capt J Senior Member

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    I was under the impression the MAN secondaries that are in the canister, that the canister was aluminum or metal, not plastic.
  10. Nicol

    Nicol New Member

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    Yeah the screw cap is plastic so I need to tighten them more
  11. Nicol

    Nicol New Member

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    Another thing, I've been getting air pressure after filter sensor alarm. The boat has two turbo on one engine as the sensor is on only one side of the turbo. Do you think the sensor is faulty?
  12. Capt Ralph

    Capt Ralph Senior Member

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    Item #1 is the black plastic cap.

    man filter.jpg
  13. Capt Ralph

    Capt Ralph Senior Member

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    If I remember, this sensor is mounted on the outside of the right turbo plumbing. sticking straight out.
    If on your port engine, it's a real pain in the ribs and hip when passing between the engines.
    Usually the connect and real small gauge wires get damages or loose.

    We made up a banjo fitting that turned the sensor 90 degrees. Saved my left hip.

    BTW; ER or E/R = Engine Room.

    If the connect and wires look good, swap the sensor between the engines and see where the problem goes or stays.
    DanFoss Sensors fail regularly and are expensive from MAN.
    Wish I could get a cross reference and buy them straight from DanFoss.
    Last edited: Oct 19, 2015
  14. K1W1

    K1W1 Senior Member

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    That should be possible if you had a new or known good one and worked out its values then found a matching one in the Danfoss range
  15. Nicol

    Nicol New Member

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    Yeah that's the one so what shall I do
  16. Capt Ralph

    Capt Ralph Senior Member

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    If your sure there are no other leaks, turn your tanks off, remove the tops again. Inspect for cracks around the hex pattern on the top and nicks in the O ring. If all looks good, grease up a fresh O ring and reassemble.
    Your not looking for tight, but ensure the cap is all the way on; lip of cap down to filter case body.
    Over torquing may cause a crack between the course threads to the lip of the cap.

    The O ring makes the seal, not the cap lip. When the cap lip is just down to the filter case, the O ring is in place.
  17. Nicol

    Nicol New Member

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    Ok thanks I will try it tomorrow and I will give you a feed back
  18. Capt Ralph

    Capt Ralph Senior Member

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    Finally had to look up Seychelles.
    Sounds like a beautiful place.
  19. Nicol

    Nicol New Member

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    Yeah it's a beautiful place and if you love fishing this is the place , you should come and visit
  20. Nicol

    Nicol New Member

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    Hi again do you know if a sensor needs to be programmed after installing it on the man cr900