4M40 Overheating problems Pajero '05

[nastynats]

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!

[kulotz]

how about yung water pump sir?

[nastynats]

Water pump is working sir eh.

[xscape]

how bout the fan?

[testament11]

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?

[nastynats]

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?

[testament11]

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

[ramledi]

nagbabawas po ba ng tubig?

[voltscastillo]

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.

[nastynats]

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.

[testament11]

siguro kwento mo sa amin kaya ang buong story ng sasakyan mo. i mean, tell us how you use your ride...

[niwde11]

bago mo pabuksan ang head pacompression test mo muna.

[larshell]

How did you check if your water pump is working properly? Huwag mo muna pa bukasan head mo. Have you tried to go to keyser in west ave in QC. Try mo muna palitan thermostat and water pump. Baka may leak yun radiator mo sa ilalim. Most of the time head repair don't last long kahit sa casa pa.

[BulmastersCreed]

bro How's your overheating problem?
I had the same problem b4 with my Accord, now i got pajero also. Try mo baka related sa naging problem ko nuon.
baka sira na ung thermo switch yata ang tawag dun, ang purpose nun para magactivate ng aux fan. ichec mo kung umaandar yun aux fan bago mag overheat o uminit. kung yun nga replacement will do. 450 ang bili ko dun. yung sa accord ko dalawa yun switch kaya chec mo.
It might be the possible solution.

[mapl]

Patanggal mo na thermostat mo. :D

[miked]

boss nats! hindi naman kaya naipasa ang genes ng 4D56 sa 4M40? hehehehe...ganyan din 4D56 ko before. ambilis umakyat yung temp kapag >80 km/h at sa stop & go traffic. kala ko nga overheating na e puno pa pala radiator at reservoir.
eto pinapalitan ko:
1. cyl head gasket
2. valve seal kasi mausok na
3. grinding ng head
4. rad overhaul and change cap(gumagamit pa rin coolant not tap water)
5. change a/t fluid

tumataas pa rin temp pero hindi na kagaya dati na ambilis umakyat temp.