overheating problem

[etrance]

I have a 92 240sx convertilble. The car has around 110,000 on it, so I have it change the timing chain (400+dollars in original parts). Well, the problem is that since that moment the motor has been working under pressure at a level that not even the nismo thermostat which opens at 62oC would work. I,ve replaced the water pump,replaced the radiator with a two line. With the money I wasted trying to fix this problem I could have bought a new motor. I,ve taken the car to five mechanics and nobody can find the problem. This engine used to run at a temperature in wich you could stop the car just after racing pop the jud and take the radiator cap of with the engine running and you could just see the coolant run with out preassure. This are the symptoms, with a thermostat the original 75oC or nismo 62oC the car will stay at normal temperature but when you run it the temperature goes to the top :angryfire . The car can only be used now with out the thermostat and is working at a temperature which builts pressure. I say That the problem has to do with the timing chain but every mechanic saids the timing is right. I need an expert opinion on how to win this battle :starwars: :help :help :help :help

[etrance]

I have a 92 240sx convertilble. The car has around 110,000 on it, so I have it change the timing chain (400+dollars in original parts). Well, the problem is that since that moment the motor has been working under pressure at a level that not even the nismo thermostat which opens at 62oC would work. I,ve replaced the water pump,replaced the radiator with a two line. With the money I wasted trying to fix this problem I could have bought a new motor. I,ve taken the car to five mechanics and nobody can find the problem. This engine used to run at a temperature in wich you could stop the car just after racing pop the jud and take the radiator cap of with the engine running and you could just see the coolant run with out preassure. This are the symptoms, with a thermostat the original 75oC or nismo 62oC the car will stay at normal temperature but when you run it the temperature goes to the top :angryfire . The car can only be used now with out the thermostat and is working at a temperature which builts pressure. I say That the problem has to do with the timing chain but every mechanic saids the timing is right. I need an expert opinion on how to win this battle :starwars: :help :help :help :help

If it wasn't for the overheating problem I would at least have install the nitrox system, what's the fun of owning a 240sx if you can,t puch it to it,s limits.:ylsuper

[groundhogday1976]

Maybe the Nismo thermostat was defective. If it doesn't overheat with no thermostat, the first thing I'd try is putting a different thermostat in.

[etrance]

thank,s for the info but the problem is I allready tried two original thermostat and the same thing happend. And I tested all three thermostat the two originalls which opened at a 75oC and the nismo which opens at a 62oC. they all seem to be working ok.

[ka240se]

you could be overheating from having a warped head.... no matter how much stuff you replace (waterpump, radiator, ect...) you will still keep overheating. you might wanna take your head up to a machine shop and get it tested..

[etrance]

I already fix the head once to make sure and the same overheating problem continues. Somebody!! could It be possible that when the upper timing chain was installed one of the camshaft was of by a teeth and still let the car run but without the thermostat? Like it is right now!!

[U12 2NR]

What does your cooling system have to do with your timing chain? You shouldn't be in the habit of opening your radiator cap after driving the car, you've never gotten a gush of hot *** coolant to the face and i'm sure you don't want it. It's supposed to have the pressure, if you didn't have pressure before then you had a problem before which was fixed during the timing chain replacement, such as a loose hose.

[Dattebayo]

e-trance, how the hell could you ever fix your head by your self? Without screwing something up? You sound like a fu**ing idiot. Look, just run it with out the t-stat or get a restrictor plate. Otherwise take the damn car to nissan.

You've got people falling all over you trying to help but it's useless cause you have no idea whats going on. (timing chain?!?) We should confiscate your 240 just on principal.

[etrance]

First, I never said I fix the head by my self, everything was fix by a mechanic. Second, If you are such a genius stop talking so much bullsh!!t and answer me this. How is that fixing a problem in the engine makes it imposible for it to cooldown with a thermostat. You seem to be a little more confuse than me. Remenber that i just gave you an idea because for you to see the hole picture you'll have to be me. If you truly want to help think more before posting your ideas. And remenber moronnnnnn the reson I mention the timing chain is because if you don't set the timing right the engine may overheat!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[etrance]

First, I never said I fix the head by my self, everything was fix by a mechanic. Second, If you are such a genius stop talking so much bullsh!!t and answer me this. How is that fixing a problem in the engine makes it imposible for it to cooldown with a thermostat. You seem to be a little more confuse than me. Remenber that i just gave you an idea because for you to see the hole picture you'll have to be me. If you truly want to help think more before posting your ideas. And remenber moronnnnnn the reson I mention the timing chain is because if you don't set the timing right the engine may overheat!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

And that overheating might be the reason for which the thermostat has to be removed.

[Dattebayo]

Look. The odds that a mechanic misplaced the timing chain on your cam sprokets is remote. There is alot of reasons why a car could overheat, but your timing chain being off by one link is not going to cause severe engine overheating. You might have a head gasket leak between your coolant lines and the cylinders between the head and the block, but otherwise you have damaged the head somehow. If you let your head overheat over the top of your heat gauge from before, you might have warped the head and your valves are causing too much friction.

[etrance]

Any Idea on how to find out if that is the problem? And the cheapest way to solve it!!

[ka240se]

like i said dood, you gotta take it to the machine shop and have it tested.....

[Asleep Altima]

ok, if the head is warped, he wouldnt be just overheating; hed be losing coolant. since that isnt the case, it cant be a warped head. anything headgasket, water galleys, or head, would lose water or there would be water in the oil or vice versa, this is not the case here. how old is the cap you are using now? and this is a stupid sounding question but ive seen it happen on maximas and ill not let it happen to me again... when was the last time you changed your oil? my cousins 91 max overheated ALL OF THE TIME. he changed the radiator, water pump, thermostat and all hoses... still, overheated. changed the oil, ran fine. what happened was the filter was clogged and causing strain on the oil pump... that made the spring close off on the bypass and now he had limited unfiltered oil flow. replaced the filter, the bypass spring reopened, engine quit overheating. also, what is your coolant mixture like? not enough water to coolant ratio will make it run hot as well... water is the catalyst in this system, there has to be enough of it to work. ALSO, if the timing is coming out correctly, how can the chain be a tooth off? it would be way too obvious.

[ka240se]

i disagree, i had a warped head and didnt loose any coolant but would almost instantly heat up to 260

[D-UNIT]

I run pure coolant. So my block doesn't rust out and no gunky stuff forms. My temp needle never ever moves from that white dot in the middle. Except when my cold azz , 29 degree a/c is on. Then it goes down just a little.

[D-UNIT]

Also if you can open the cap with the engine hot and old faithful doesn't come out of the radiator , then your system is not making the pressure needed to offset heat.

[etrance]

I am loosing coolant but the reason is that the engine is working to hot. How do I know this? Becuase I've seen it. Right know the cars can last about 2 to 3 straigh hours in a hot day. And you can find that the water is at the reservior tank. I know that is suppose to be the other way around but remenber this car aint working right. And the cap was tested for pressure the radiator was tested for air leaks the water pump is fine the car is suppose to be fine. The problem is that no body seems to find the problemmmm. Any other ideas??????? besides buying a new engine!!

[Asleep Altima]

what about water in your oil and vice versa? are you SURE there isnt any in either? d-unit, you need to get some water in that coolant. youre not protecting against hot or cold without water in it. like i said before, coolant needs water to work, its the catalyst.ka24se, a warped head will lose coolant. plain and simple. warped means that the surface of the head is tweaked, and not sealing against the head gasket and/or block like it should be. you will lose coolant that way.

[ka240se]

he man, you need to go back to sleep, cause a warped head can be one of two things, one. the head is warped causing you to loose coolant. two. the walve itself is warped and is causing the overheating.... why do i say this??? I HAVE BEEN THROUGH IT A FEW TIMES BEFORE! thank you and have a nice day

[Asleep Altima]

you talking to me? all you did was repeat what i said if you are... ive been through it too, ive probably fixed more than youve experienced. the point is, youre just saying what ive already said. if you werent talking to me, forget about everything i just wrote.

[Dattebayo]

Pull off your mitts boys and duke it out YEAH. HAHA everyone is right. So like we're saying, etrance, your head is warped, and you should really get a new or used head (and take the advantage of the situation, maybe get some cams in the new one). You have to take it to the machine shop first, though.

[Asleep Altima]

haha, im not gonna fight with this guy on the internet, lol. its a simple disagreement, thats all. but i think dude has a warped head. this could be interpreted a couple ways...

[U12 2NR]

The fact that he can run the car without a thermostat and not overheat tells me that the head is not warped. Even without the thermostat, eventually a warped head would cause over heating. No one knows the condition of this engine, are the coolant channels all mucked up with rust?

If one of you think the head is warped, that's a very good solution. However, don't be so eagar to tell someone to go and replace the head. A simple compression test will give further insight to the problem. If two adjacent cylinders' compression are low, then certainly a warped head would seem to be the problem. THEN you would think about removing the head.

[Asleep Altima]

he loses coolant though. that changes the prognosis... if it was my car, id do a CLT along with a compression test. he should also check his coolant while the car is running to see if hes got any bubbles.

[etrance]

I left the car with an old nissan mecanic and he told me that the timing was right. The problem now is that the engine is building up some pressure, what I meen is that when you open the radiator cap in the morning to check the coolant level, that is without turning on the engine, the pressure spits out some water. Whell the mecanic said that the head might have a crack somewhere, so I ask what is the cheapest outcome. I,m going to try a block sealer on monday and see what becomes of my car.

If any of you got any better Ideas please be wellcome.This problem is making me lose money and time. I need for this car to be reliable. At least for 6 months.(I work a full plus I study full)I really need to fix this problem.

[etrance]

ORIGINAL POST:<<This are the symptoms, with a thermostat the original 75oC or nismo 62oC the car will stay at normal temperature but when you run it the temperature goes to the top . The car can only be used now with out the thermostat and is working at a temperature which builts pressure.>>

Is it me only or did he not explain that correctly..??

what's the point of what you are saying?

[etrance]

The head is coming out this weekend. I'll let you know if all of you were right.

[D-UNIT]

did you change the cap first??