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Generation 1 Pajero NA - NG Models 1983 - 1991

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  #1  
Old 11-08-09
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Default Rough idling when hot

I've been playing in Landcruiser Mountain park last weekend and while that was heaps fun, it also highlighted a little issue. My Paj (a 89 V6) gets pretty hot when running in low gear for prolonged time, to a point where the water comes out of the system boiling hot (had a few leaks lately and haven't changed the water to coolant yet). When the engine gets that hot, it also starts idling rough, which gets dangerous as it tends to cut out. That's no fun going down a steep section and the brake booster looses vacuum and power steering is gone.
I'm planning to replace the water again with coolant, and while I'm at it probably take the radiator out and give it a good clean, and also have the injectors cleaned for better milage (hoping) and better idling. Will also be checking the extra fan on the front of the radiators.
Anybody else have any suggestions what I could also do to prevent it from overheating too much? Other than not use low gear? :-P
Or to have it idle smoother? The engine is a recon with some 60k on it, and generally runs very nice.
Cheers! Olger.
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  #2  
Old 11-08-09
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Wink All you can do is go through the basics

All you can do is go through the basics
-tune is right
-clutch/electric fans is working (clutch fan might not have any fluid/wax in it)
-thermostat is ok
-flush system
-change coolant use distilled water
-check hoses aren't crushing when getting hot
just a couple as i'm not to familiar with the V6.
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Old 11-08-09
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And the fan on the front or your radiator is for the A/C so i don't think that's a problem.
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Old 11-08-09
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Quote:
Originally Posted by Da_rooster1980 View Post
And the fan on the front or your radiator is for the A/C so i don't think that's a problem.
although it does reduce the cross section of ur radiator, as my aircon dont work im gonna get rid of the fan
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  #5  
Old 17-08-09
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OK, so far I've replaced my tapwater in the radiator with coolant, I know the thermostat is still good, as that's been replaced not long ago. It normally idles and runs good, though I stil need to get a proper tune up done.
Last weekend I ended up doing quite a bit of mountain driving around Mt Barney Nat Park, all on tarmac though, and noted that it was starting to heat up again. Nomally the temp needle sits well below half way, but due to relaxed driving up hill, hence low rpms, the engine was building more heat than the cooling system could disperse.
Considering the radiator fan is belt driven and rotates at engine speed, low engine speed while working hard means more heat buildup. So I'm thinking of replacing the stock fan with electric fans instead. The belt driven fan needs to be replaced soon anway due to cracks in the plastic. Added benefit is that I can turn the fan(s) off with a switch when doing a water crossing.
Does anybody have any experience doing this? Rather than have the fan(s) going at full speed all the time, I'd rather have them controlled and speed up as heat increases. In a dual fan setup, one fan could kick in delayed effectively saving the fan (or rather the bearings and elec.motor).
Cheers! Olger.
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Old 17-08-09
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why would u want the fan turning off during water crossings?
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  #7  
Old 17-08-09
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Basically to prevent the blades on the fan to hit water while rotating, possibly causing them to bend and hit the radiator. My current fan (belt driven) has cracks in it, possibly from hitting water while rotating. It's just something I could do with electric fans, but not with a belt driven fan.
Cooling isn't a problem when going through deep water :-D
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Old 17-08-09
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Quote:
Originally Posted by OlgieD View Post
Basically to prevent the blades on the fan to hit water while rotating, possibly causing them to bend and hit the radiator. My current fan (belt driven) has cracks in it, possibly from hitting water while rotating. It's just something I could do with electric fans, but not with a belt driven fan.
Cooling isn't a problem when going through deep water :-D
i hear a lot of people saying this, but the fan is mounted behind the radiator, how would it hit it?
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  #9  
Old 17-08-09
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Quote:
Originally Posted by bakerboy View Post
i hear a lot of people saying this, but the fan is mounted behind the radiator, how would it hit it?
The water slows the fan rapidly and the fan blades try to spin and bend, moving forward into the radiator.
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Old 18-08-09
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looks like that but can be worse.
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File Type: jpg radiator.jpg (75.1 KB, 36 views)
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