Outer Limits 4x4 Board

Does anyone know what would be causing the coolant to be pushed out of the resevoir? It is not overfilled. Happens mainly when there is more load on the engine.

You're probably not going to want to hear this:

1. Your radiator cap isn't holding pressure

or

2. You've got a blown head gasket or cracked head....

That's what i was afraid of...but if the gasket was blown, would it not have white smoke coming out of the exhaust?

Depends on the severity of the damage (if any)...

Go and buy a new cap first up... If it doesn't fix it... go see a mechanic, as the worse it gets, the more it will cost

Check your exhaust pipe on a cold day and see if it's still blowing condensation once the engine is warm. Also rip all the spark plugs out and see if any are extra clean or have a green tinge to them (assuming your coolant is green!)

Another way to check is to stick an exhaust gas analyser probe into the coolant overflow and see if it registers anything (but I'm guessing you won't have one of them lying around in your shed!?)

Also you could get the coolant system pressure tested (as well as the cap) and see if it holds pressure.

Or u can get some one to start it up when cold while your at the end of the exhaust pipe, put ur hand in front of it when it starts up, if it feels "wet" it's a possibility it's a blown head.

MudRoza wrote:Or u can get some one to start it up when cold while your at the end of the exhaust pipe, put ur hand in front of it when it starts up, if it feels "wet" it's a possibility it's a blown head.

If this is true, then head on my feroza is blown for at least one year and 80.000km. I know my radiator cap isn't holding presure and had to fill with half of liter of water to reservoir each 20.000km. My roza has 284.000km and machine was newer open.

Also, another way to see if your head gaskets goone. pour a bit of water on/around your head when its not too hot. If you see bubbles, or puffs of smoke as I did , she's cactus

Yeah it did work for me when i had my bomb, wet start up every morning till it carked itself. it was a head gasket that gone bad. overnite, when the motor's not running, water slowly pours into the cylinder, in the morning, start it up and where do it go? out the exhaust, the motor cause "earthquake" for a few minutes, after a while it's smooth.. yeah i've learnt a lot from that bomb and i hope not to pass it onto the roza as it's the best car i've ever got since sliced bread.

RockyF70 wrote:Also, another way to see if your head gaskets goone. pour a bit of water on/around your head when its not too hot. If you see bubbles, or puffs of smoke as I did , she's cactus

It's rare to have a head gasket let go and vent out to the atmosphere. Usually it's internal and between the cylinder / water gallery (which it would likely be in this case due to the radiator pressurising.)

well it happened to me too, at the very end when it wouldn't kick in.. had water shooting out between the head and block, under the manifold.

MudRoza wrote:well it happened to me mate

MudRoza wrote:it was a head gasket that gone bad. overnite, when the motor's not running, water slowly pours into the cylinder,

Ummm... you might want to read what I wrote again!?

Murcod wrote:It's rare to have a head gasket let go and vent out to the atmosphere. Usually it's internal and between the cylinder / water gallery (which it would likely be in this case due to the radiator pressurising.)

murcod wrote:

MudRoza wrote:well it happened to me mate

MudRoza wrote:it was a head gasket that gone bad. overnite, when the motor's not running, water slowly pours into the cylinder,

Ummm... you might want to read what I wrote again!?

Murcod wrote:It's rare to have a head gasket let go and vent out to the atmosphere. Usually it's internal and between the cylinder / water gallery (which it would likely be in this case due to the radiator pressurising.)

Soo, head gasket from my roza is gone bad. But roza still works fine(after 10sec eartquake in the morning).

What should i do?
Fix it or waiting that it will uses half of liter of water in les km that now. Now it consumes hakf of liter on 20.000 km.

thanks for the info. will try new cap tomorrow and see how she fairs. the current cap is obviously old. Radiator has 130,000 miles on it, i am guessing and the rubber is cracked on the seals of the rad. cap. UNfortunately, local and chain part houses, here in the U.S., do not offer an oem replacement cap. anybody have any suggestions for one? GO generic or off a toyota?

An aftermarket cap should be OK.

Nebivedu it's up to you. Are you sure it's definitely the gasket as half a litre in 20000km isn't much coolant to be losing. There are additives you can put into the radiator that are supposed to fix up such leaks- could be worth a try for such a small leak? Is your radiator getting pressurised and overflowing, or is your oil a milky colour at all?

murcod wrote:An aftermarket cap should be OK.

Nebivedu it's up to you. Are you sure it's definitely the gasket as half a litre in 20000km isn't much coolant to be losing. There are additives you can put into the radiator that are supposed to fix up such leaks- could be worth a try for such a small leak? Is your radiator getting pressurised and overflowing, or is your oil a milky colour at all?

There is no water in oil or oil in the water. i change oil on every 7500km and oil is clean. Only earthquake in the morning and water leak from exaust when machine is cold. The cap on radiator is bad and there is no preasure in the radiator.

I will try to change a radiator cap today.

a blown HG would normaly blow small bubbles through the cooling system too, which you would see looking into the radiator when the rad cap is off and engine running.

i'ld go with murcod's 1st point of the rad cap.

Kickingback99 wrote:thanks for the info. will try new cap tomorrow and see how she fairs. the current cap is obviously old. Radiator has 130,000 miles on it, i am guessing and the rubber is cracked on the seals of the rad. cap. UNfortunately, local and chain part houses, here in the U.S., do not offer an oem replacement cap. anybody have any suggestions for one? GO generic or off a toyota?

You can get em here at Gas stations. I got a new one for mine just cause the old one looked yukky

I had same problem.... bought an aftermarket radiator cap and problem solved.


But then I discovered my water pump is leaking

ok, have replaced radiator cap. still pushing coolant to overflow reservoir. Has anybody changed replaced their head gasket themselves, and if so, how difficult was it. Its on a 1990 US ROCKY, which is fuel injected. It's not my daily driver, and I'm up to trying, just want to get an idea of what has to be actually done. Have looked in factory manual, but want someone's valuable experience to go with the what the factory says.

I have to clean carbon build up out of the intake anyway, so why not.

I've done one twice on a Daihatsu CB70 ( 3 cylinder 993cc twin cam EFI turbo).

There's a fair bit of stuff that will need to be stripped off to get the head off and you'll have to make sure you get the timing belt aligned correctly when finished.

I'd advise to get new head bolts, a timing belt and the gasket all in your hands before starting. The head bolts stretch once torqued up so it's advisable to get new ones.

You should take it to a mechanic and get the coolant system pressure tested first to make sure it's definitely the problem. They will pressurise the coolant system with the engine off and that should result in coolant getting forced into one of the cylinders if the gasket is gone.

Have you checked the spark plugs at all?

Make sure you get the head machined while it's off too. That involves stripping everything off it and them making sure the mating surface is perfectly flat and square. Shouldn't cost much (last one I had done was around AUS $75.)

Thanks for the input. As for head bolts...is that something you have to get from daihatsu or what?

You should be alright reusing your own providing they haven't been reused multiple times. Ideally new ones are the go. My guess would be that they would be a Daihatsu only part?

Checked spark plugs today. They all look the same and that being normal. Noticed in my overflow that there was quite a bit of what looked like just plain dirt. Had flushed and changed coolant 5000 miles ago. Had same substance in reservoir at that time. If there was something clogging system, would this cause the problem?