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  1. Join Date
    Apr 2009
    Posts
    8
    #1
    Guys need help w/ my 4M40 Engine on Pajero '05, still overheating after checking hoses, overhauling radiator, passing bubble pressure test, replacing radiator cap. Over heating on high revs only and water from radiator transferring to the reservoir. hope someone could share a light on this. and any recommmendation for a reliable motorshop aside from casa.

    Thank you!

  2. Join Date
    Apr 2009
    Posts
    540
    #2
    how about yung water pump sir?

  3. Join Date
    Apr 2009
    Posts
    8
    #3
    Water pump is working sir eh.

  4. Join Date
    Feb 2008
    Posts
    39
    #4
    how bout the fan?

  5. Join Date
    Sep 2007
    Posts
    8,451
    #5
    is it really overheating? nangyari na sa kin kasi one time, akala ko overheat. napabili ako ng wala sa oras ng 1 gallon ng distilled water. pagbukas ko ng radiator, puno naman tubig ko. yun pala, aux fan ng aircon ang problema.

    please check the rotation ng water pump kung maganda pa. at yun play niya, dapat wala yun. btw, anong tubig gamit mo sa radiator mo, distilled ba, pre mixed coolant, o tap water lang?

  6. Join Date
    Apr 2009
    Posts
    8
    #6
    Fans are working sabay sa aircon as well, Water pump has no leak eh, im not sure about the rotation, i use tap water, does it make a difference?

  7. Join Date
    Sep 2007
    Posts
    8,451
    #7
    it DOES make a difference sir, a very big difference. having distilled water on the cooling system reduces, if not eliminates rusting of the whole cooling system

  8. Join Date
    Jun 2009
    Posts
    288
    #8
    nagbabawas po ba ng tubig?

  9. Join Date
    Apr 2004
    Posts
    1,100
    #9
    i can only think of either a clogged/broken thermostat, rotating but weak fans, or more seriously, a warped head. oh, if its a/t maybe old dirty a/t fluid causing the engine to work harder than usual.

    i hope it's not a warped head. how's your coolant and oil look? slimy? coolant smells like oil and oil smells like rust? mahirap daw i-shave ang head ng 4m40 pag nag warp... may ceramic inserts daw kasi.

  10. Join Date
    Apr 2009
    Posts
    8
    #10
    thanks for the replies, im kinda ruling out everything and ryt now all the external issues seems to be ok, it's leading me to have the head opened. any reliable(by experience) Motorshop round QC?? thinking of having it repaired in the CASA seems a horrible expenditure.

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4M40 Overheating problems Pajero '05