Bubbles in radiator even after top overhaul..gurus help!

[mikoyreales]

help naman mga guru.. 1st time ko naexperience tong top overhaul. my ride is a second hand '97 toyota hilux surf (conversion). eto mga pinagawa sa oto:

- cylinder head resurfaced + hydrotest
- changed CH gasket
- changed valve guides, valve covers
- overhauled radiator (metal sya hindi plastic type)

1 week inabot yung trabaho. pagkuha ko ng oto sa mekaniko, ang sabi ok na daw. paguwe ko sa bahay, ok sya but after the 3rd day pag start ko e may makapal, mabaho at masakit sa mata na white smoke sa emission. pinatay ko makina then after a few minutes inistart ko ulit at hindi na sya naulit.

ang malaking disturbance saken e nagappear na nman yung small bubbles sa radiator! binalik ko sa mech at sabi normal lng daw yun sa makina ko.

question:
1) normal lang ba talaga na may bubbles ung radiator?
2) normal lang din ba na ung upper radiator hose ay napakatigas at mainit na feeling ko sasabog na sya?

pasensya na mga gurus, newbie lang...i hope you can lend some help.
TIA

[mazingerZ]

When you say bubbles - talaga bang parang boiling? Kasi kung me air pockets pa sa radiator at sa engine block normal lang kung maliit at hindi frequent. Did you try checking your dipstick - did your oil level decrease? Does the oil consistency have a milky texture (meaning parang mocca white)?

I believe na di pa nabebreak-in uli ang tsikot mo, try observing for say at least 500 kms, drive it moderately lang muna, until such a time na fully seated na ang components - say cylinder head gasket, oil seals, valves, etc.

[mikoyreales]

tnx sa reply! marami at frequent bubbles as in... walang changes sa oil level and consistency.

kgabi after 10 minutes ng idling, napatigas ng upper radiator hose. kabado ako baka mamaya magtodo bulging at sumabog, abutin pa ako sa hi-way. pressure build-up ba ito?

[speed unlimited]

Kung alam mong luma na iyong hose palitan mo na dahil din sa katagalan at init naapektuhan rin iyang radiator hose kung iyan ang inaalala mo para iwas abala kung bumigay hose mo.

[mazingerZ]

I believe so. Try replacing your rad cap to higher psi rating, and observe for a while.

[mikoyreales]

mga sir, normal ba na matigas at mainit ung upper hose ng rad?

[jvnj]

Sir Mikoyreales,

Can you give inputs on what parameters indicates in your temp gauge? Hindi ho ba sya mataas? Hindi ho ba nagbabawas ng tubig sa radiator?

Most likely, my guess are as follows:

1. Defective/damage CH gasket (probable illustrations by Sir mazingerZ)
2. Clogged radiator
3. Defective Thermostat (dont know the exact name, but its a mechanical device/part that controls the flow of radiator liquid)

Presence of bubbles in a cooling system is not normal. Also, kung di naman luma yung hoses nyo, di dapat sya tumitigas pag umaandar (as illustrated na parang sasabog), it indicates a high pressure system (might be abnormally high) which is a sign of restriction or abnormally high temp, dapat normal lang ang tigas. Better have it checked with a competent technician.

Thanks

[ARB]

does the water jump out of the radiator opening when the engine is on? try mo pa re torque ang cylinder head.

[miked]

does the water jump out of the radiator opening when the engine is on? try mo pa re torque ang cylinder head.

try "burping" your cooling system several times. open rad cap and let engine run with vehicle on an incline. front higher than the rear.

mine have continuous stream of bubbles...sometimes frothing.

right after starting, there is a considerable pressure buildup with the water still cold

sa mga hoses, better buy the OEM as well as clamps OEM din. upper hose is at a higher pressure (because of the action of the pump as well as water expands when heated) than the lower hose (sometimes vacuum occurs in the lower hose due to very high speed of the water pump = hose collapsing = overheating at highway speeds)

try retorquing your head bolts (when cold if aluminum head, while still hot if cast iron head) to specs if they are the reusable ones. do not retorque if they are the torque-to-yield bolts. head bolts torque usually in the 110-125 Nm range (about 80% of their shearing strengths)

just my info on this.

another DIY for me this weekend. the head gasket.

[mikoyreales]

tnx miked for that reply..cguro itry ko na lang iparetorque ung cyl head bolts.

i'll update you guys na lang next time. salamat sa mga inputs!