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post #1 of (permalink) Old 09-10-2003, 09:41 PM Thread Starter
 
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I need help with an overheating problem

I put a 1.6, 16v motor in my Sami in August. It ran great until last month. I was 4 wheeling and it got close to the red zone, but not in it, and ever since then, it has become progressively worse.

After about 10 minutes of driving, it gets hot enough to put the needle in the red. I can hear the water boiling in the engine/radiator hoses and it pushes water and steam into the overflow bottle.

So far, I replaced the head gasket, radiator cap, thermostat, fan and clutch. I removed the water pump and the blades are turning when I spin the other side. I ran the engine with the cap off, and I can see the water pump is pushing water. It pushes it fast enough to pump out the open cap when I rev the motor. The fan is definately turning when the engine is running. I don't see any water in the oil, there is fresh oil in the engine.

I am totally at a loss. It was running fine for 2 months, then starting running hotter and hotter. [img]images/graemlins/confused.gif[/img]
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post #2 of (permalink) Old 09-10-2003, 10:03 PM
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Re: I need help with an overheating problem

Really sounds like a gummed up radiator or bad radiator. Is your fan clutch good? Do you know how to test a fan clutch? Do you have a 3 core radiator (causes you to overheat)?
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post #3 of (permalink) Old 09-10-2003, 10:41 PM Thread Starter
 
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Re: I need help with an overheating problem

But it was NOT overheating at all, then one day, starts to overheat. I flushed it and it seems to flow just fine.

I tried a new clutch and it does the same. I still have the stock sami radiator, but again, it did NOT overheat for months.

And oddly enough, it can sit and idel for 30 minutes and not get hot, but drive it, and it gets hot. That would lead me to belive it is not the fan.

Also, FYI, I ran without any thermostat at all for a couple days. Same exact results.
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post #4 of (permalink) Old 09-10-2003, 11:03 PM
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Re: I need help with an overheating problem

Hmph, thermostat stuck open?
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post #5 of (permalink) Old 09-10-2003, 11:06 PM
 
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Re: I need help with an overheating problem

I believe it's the radiator. Find someone with one of those temperature guns (don't know the technical name) and see what the temp is in different spots on the radiator. I bet you'll be surprised at what you see. Don't believe you're getting good flow in the radiator just because water shoots out the bottom when you put the water hose in the top.
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post #6 of (permalink) Old 09-10-2003, 11:15 PM
 
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Re: I need help with an overheating problem

It sounds like you may be running lean above an idle. what are you using to feed it gas? carb? EFI?
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post #7 of (permalink) Old 09-10-2003, 11:18 PM Thread Starter
 
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Re: I need help with an overheating problem

EFI. OK guys, I will set the timing and pull the rad tomorrow and give those a shot.
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post #8 of (permalink) Old 09-10-2003, 11:40 PM
 
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Re: I need help with an overheating problem

I second the thermostat. If the timing has jumped enough to run hot you could tell a difference in the way the engine runs.
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post #9 of (permalink) Old 09-11-2003, 05:30 AM
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Re: I need help with an overheating problem

Since you are pulling the radiator, it'd be a good idea to check the timing on the crank timing gear and cam timing gear. Also, set the timing [img]images/graemlins/laugh.gif[/img]
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post #10 of (permalink) Old 09-11-2003, 05:39 AM
 
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Re: I need help with an overheating problem

sill question but is the thermostat the right way up??. happened to me a while ago when i got the head redone by the mechanic.. caused endless probs like u mentioned.
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