br1anstorm
NAXJA Forum User
- Location
- United Kingdom
Can I check the pump-rotation without having to remove it?
My 93 XJ - which I've owned since new - has done 100k miles. For years, even in extremely hot conditions, the temp stayed rock solid just beow 210. More recently it has started to overheat (gauge gets up to the next mark above the 12 o'clock/210 figure) during high speed/high load/hot weather/highway driving. Slowing down brings the temp back to normal. Electric fan cuts in OK with a/c or when temp rises, but in hot conditions now clearly struggles to cool hard-working engine.
System has been flushed, hoses are OK (bottom one still has spring in it), and new t/stat was put in. But it still seemed to run hot, notably when heavily loaded. I suspected the fan clutch (I tried standard test: fan seemed to spin rather too freely by hand when engine was switched off while hot). So I've replaced the fan clutch.
Haven't yet been able to re-test the system under serious heat and load, but temp still seems to be creeping up above 210 in normal driving more than it used to. So now I suspect the water pump. It was replaced by a non-Jeep garage about 18 months ago because the original one was making an unhealthy noise (bearings?). I didn't see the new pump before it was fitted. Now, after browsing the forums, I'm wondering whether the garage fitted the wrong pump - one which is not reverse rotation?
Two questions: first, would the wrong pump (ie with the impeller blades the wrong way round) produce the symptoms I've noticed? In other words, would it still push or pull the water around just enough to keep the engine temp roughly normal in easy driving, but not pump enough volume to cope when things get hot? Or would the wrong pump be totally ineffective in circulating the water even in normal driving?
Second question: is it possible to tell from the outside whether the replacement pump fitted to my Jeep is the correct (reverse rotation) one or not? Or is removing the pump in order to look for an "R" on the impeller blades the only possible way to check? I just don't relish the task of having to drain down the system, and unbolt and remove various bits in order to get the pump off - just so i can look at the blades....
br1anstorm
My 93 XJ - which I've owned since new - has done 100k miles. For years, even in extremely hot conditions, the temp stayed rock solid just beow 210. More recently it has started to overheat (gauge gets up to the next mark above the 12 o'clock/210 figure) during high speed/high load/hot weather/highway driving. Slowing down brings the temp back to normal. Electric fan cuts in OK with a/c or when temp rises, but in hot conditions now clearly struggles to cool hard-working engine.
System has been flushed, hoses are OK (bottom one still has spring in it), and new t/stat was put in. But it still seemed to run hot, notably when heavily loaded. I suspected the fan clutch (I tried standard test: fan seemed to spin rather too freely by hand when engine was switched off while hot). So I've replaced the fan clutch.
Haven't yet been able to re-test the system under serious heat and load, but temp still seems to be creeping up above 210 in normal driving more than it used to. So now I suspect the water pump. It was replaced by a non-Jeep garage about 18 months ago because the original one was making an unhealthy noise (bearings?). I didn't see the new pump before it was fitted. Now, after browsing the forums, I'm wondering whether the garage fitted the wrong pump - one which is not reverse rotation?
Two questions: first, would the wrong pump (ie with the impeller blades the wrong way round) produce the symptoms I've noticed? In other words, would it still push or pull the water around just enough to keep the engine temp roughly normal in easy driving, but not pump enough volume to cope when things get hot? Or would the wrong pump be totally ineffective in circulating the water even in normal driving?
Second question: is it possible to tell from the outside whether the replacement pump fitted to my Jeep is the correct (reverse rotation) one or not? Or is removing the pump in order to look for an "R" on the impeller blades the only possible way to check? I just don't relish the task of having to drain down the system, and unbolt and remove various bits in order to get the pump off - just so i can look at the blades....
br1anstorm