4D56 Overheating

[NightRock]

Any suggestion to solve this problem, Im not sure if the piston was been oversize before.. Cylinder head was changed and top ovehauled also done, Probem is During High Rev * speed of 120km/hr temperature increasing, Im thinking of adding additional Fan but where to put it,

It also overheat during trapik if the AC is on but up to 50% gauge reading, I have done routine radiator cleaning.


Suggestion Please.!!!!!

[afrasay]

before nag change ng head nag overheat ba ito? re-adjust valve tappets.

[Djerms]

I'm thinking of adding an additional fan too. 4d56 din po. Hope to hear suggestions where to put it and shops that can do this.

Nightrock,
Try to remember kung nag-ooverheat siya before the overhaul. Medyo hindi yata typical na mag-overheat at high speeds. Yung sa traffic pwede pa. I experience this all the time. Well, not exactly overheating but rising temp talaga.

[jackaroo]

NightRock

Have you changed the water pump and thermostat? Old pump may not have enough water flowing. If no thermo, water can flow too fast with insufficient time to cool in radiator.

Also check the clutch fan- may be too soft due to old silicon oil, just replace silicon oil inside clutch fan.

[vinj]

I'd go with what Jackaroo mentioned... check the thermostat and the water pump.

A stuck-up thermostat will usually slow down coolant flow so when the engine is revving/moving, the heat builds up.

One symptom of busted water pump is that you lose water when the engine is running.

Kung medyo luma na pareho at di pa napapalitan, maybe it's time to do so na rin as it's not that expensive for those parts.

[NightRock]

Originally posted by jackaroo
NightRock

Have you changed the water pump and thermostat? Old pump may not have enough water flowing. If no thermo, water can flow too fast with insufficient time to cool in radiator.

Also check the clutch fan- may be too soft due to old silicon oil, just replace silicon oil inside clutch fan.

Mukhang eto palang ang hindi ko pa na Try... it was over heating even before overhauling.... I have also notice na mababaang oil pressure..


But there is no sign na sira na ang water pump. well medyo nag babawas nga ng tubig pag tumataas ang temp during up to 50% gauge reading .. is it possible that water pump can be paritally chocked?? that can cause low supply of water during running

[rlp1099]

NightRock,

radiator cleaning- was this done with LavRamon sabay coolant /water mix replenish????

Para lang may checklist and process of elimination:

1. insufficient coolant in system
2. drivebelt defective or not adjusted properly
3. radiator core blocked or grill dirty or restricted
4. thermostat faulty
5. fan not functioning properly
6. rad cap not maintaining proper pressure
7. ignition timing incorrect
8. defective water pump
9. improper grade engine oil
10. inacurate tem gauge

NOTE: troubleshooting list covers 4g54, v6, 4d56, 4mf40

HAYNES 0-21 sec 27

[NightRock]

rlp1099
I dont exactly know what is this LavRamon process as I have done ratiator overhauling medyo maramni nga dirt na nakuha , I have tried water/coolant mixture too.

Radiator cap pinalitan ko na din, Dati fully synthetic sya mas ok nga medyo hindi umiinit pag nasa trapik, Yung temp gauge Ok naman nag zero check ako while running inalis ko yung connection.. nag zero naman. thermostat nalang at water pump ang hindi ko pa na papa check.

Thanks

[Dieseler]

Nightrock,

When is the last time the Water Pump was replaced?

[NightRock]

Originally posted by Dieseler
Nightrock,

When is the last time the Water Pump was replaced?

No Idea but for sure more than a year na.. How long normally does it takes to replace the water pump?

[vinj]

Have you checked out the thermostat already? Another item also is that there may be air pcokets in the cooling system...

[NightRock]

I haven't checked the thermostat yet can it be rapaired or need to re place it??

[frt]

Thermo is replaced if broken.

Also check your clutch fan. it might be spinning but the silicon is not sticky anymore.

Also look for water leaks around the engine and water hoses.

IS the water in the reservoir gone after driving the whole day?

[Dieseler]

Originally posted by NightRock
No Idea but for sure more than a year na.. How long normally does it takes to replace the water pump?

Usually every 60,000 km. Some prefer a longer interval, though.
I had my changed around 65,000, kasama sa timing belt.

[momoyster]

i also experienced that before when driving our '89 pajero at high speed. bagong overhaul ang radiator but the temp would keep on rising as the speed went beyond 100kph. at 120 kph-3000 rpm (sagad na talaga yung makina), the gauge would already be pointing beyond the halfway mark, 3/4 to be exact. slowing down to 100 kph would bring it back to the half point. stuck-up yung thermostat, lime deposits caused thermostat failure

[NightRock]

Originally posted by momoyster
i also experienced that before when driving our '89 pajero at high speed. bagong overhaul ang radiator but the temp would keep on rising as the speed went beyond 100kph. at 120 kph-3000 rpm (sagad na talaga yung makina), the gauge would already be pointing beyond the halfway mark, 3/4 to be exact. slowing down to 100 kph would bring it back to the half point. stuck-up yung thermostat, lime deposits caused thermostat failure

This sounds good to me.. I'll try to changed thermostat ASAP... and see if there's changed... doest it mean talagang tumaatas ang engine temp or its just a gauge reading???

Any idea howmuch thermostat will cost me?? and how long it will take to replace it?? it is much complicated parts to be replace?

[Djerms]

Nightrock,
Mura lang ang replacement part. Basta test it first before installing it in your engine para sure and para isang labor cost lang.

How to test:
Parang nagluluto ka ng hardboiled egg.
1. Put it in a pan with water
2. Boil the water (kumukulokumukulo)
3. Check mo kung umurong ang spring sa thermostat, making way for the water to pass through.

The idea behind this is to let water circulate into your engine once it is warmed up.

HTH, goodluck!

[vinj]

Yup, mura lang yung thermostat. What some do is they just remove it but i would advise against that as it doesnt keep your engine on the optimal operating temp.

[NightRock]

Originally posted by vinj
Yup, mura lang yung thermostat. What some do is they just remove it but i would advise against that as it doesnt keep your engine on the optimal operating temp.

Pardon my ignorance but I haven't seen car engine thermostat.. and where it is located... I have seen a lot of industrial thermostat but bot for the car...

anyone have a picture of it

[NightRock]

Ok think this site answer my Questions about thermostat....

http://auto.howstuffworks.com/cooling-system8.htm