Has a water pump leak
#1
Has a water pump leak
1996 LS400 230K miles
The leak was observed behind the crank shaft pulley, close to the sink hole.
The water pump and timing belt were replaced 20K miles, two and a half years ago., using the aisin part kit from that reputable ebay seller.
https://www.clublexus.com/forums/ls4...-progress.html
The leak is small. Need to add coolant to the overflow bottle once a month. (about one inch). There is more leak when the weather is colder.
Do I have to do water pump replacement again? Nooooooooooooo
The leak was observed behind the crank shaft pulley, close to the sink hole.
The water pump and timing belt were replaced 20K miles, two and a half years ago., using the aisin part kit from that reputable ebay seller.
https://www.clublexus.com/forums/ls4...-progress.html
The leak is small. Need to add coolant to the overflow bottle once a month. (about one inch). There is more leak when the weather is colder.
Do I have to do water pump replacement again? Nooooooooooooo
Last edited by dashan; 03-01-14 at 12:25 AM.
#4
make sure the upper radiator hose is properly sealed at the thermostat housing, it work loose and you'll see about this much coolant loss. The way it drips down makes it seem like a water pump issue.
#5
Leak at 20K miles made me wonder the quality of the ebay Aisin water pump. The ebay seller had been in the business selling Japanese auto parts for a long time and had very good reviews.
Last edited by dashan; 03-01-14 at 08:28 AM.
#6
I went back and looked at your photos, and I think/guess your little o-ring may be the culprit. I also used aisin on 2 of our jobs without trouble, and used NAPA on the others with no issues. I just worried about that o-ring on all of ours, but it held up.. anyway good luck..
#7
I went back and looked at your photos, and I think/guess your little o-ring may be the culprit. I also used aisin on 2 of our jobs without trouble, and used NAPA on the others with no issues. I just worried about that o-ring on all of ours, but it held up.. anyway good luck..
I have a question: How can I positively identify where the problem is when I tear the engine apart again? Gasket, O-ring, or the water pump itself? I am wondering whether I will need to buy a new water pump.
Is it possible to drive the car (say a 1K mile one way trip) while I closely monitor the leak?
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#8
I can think of many more likely sources than a relatively new water pump.
coolant migrates down following gravity, and there are a lot of places coolant travels higher up around the front of the engine that could be the leak source besides the water pump!
it's like for every 100 LS400's I see with a steering rack wet with power steering fluid, you know how many are actually the rack itself leaking? - maybe 1 or zero!
coolant migrates down following gravity, and there are a lot of places coolant travels higher up around the front of the engine that could be the leak source besides the water pump!
it's like for every 100 LS400's I see with a steering rack wet with power steering fluid, you know how many are actually the rack itself leaking? - maybe 1 or zero!
#9
you are going to have to take off all timing covers and dry everything off good and drive around the neighborhood with covers off to find the leak - you may even need to remove the fan from the fan pulley bracket to make sure it doesn't blow away your evidence!
#10
I can think of many more likely sources than a relatively new water pump.
coolant migrates down following gravity, and there are a lot of places coolant travels higher up around the front of the engine that could be the leak source besides the water pump!
it's like for every 100 LS400's I see with a steering rack wet with power steering fluid, you know how many are actually the rack itself leaking? - maybe 1 or zero!
coolant migrates down following gravity, and there are a lot of places coolant travels higher up around the front of the engine that could be the leak source besides the water pump!
it's like for every 100 LS400's I see with a steering rack wet with power steering fluid, you know how many are actually the rack itself leaking? - maybe 1 or zero!
#14