97 ST coolant leak when running - Defender Source
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  #1  
Old May 20th, 2015, 06:34 PM
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Nate
1997/Defender 90 ST
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97 ST coolant leak when running

Folks,

My 97 just started leaking coolant while running. It appears to becoming from the housing where the fans belt attaches. Is this common. Any way to check? Thanks
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  #2  
Old May 20th, 2015, 06:40 PM
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Jason England
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Quote:
Originally Posted by nflory View Post
Folks, My 97 just started leaking coolant while running. It appears to becoming from the housing where the fans belt attaches. Is this common. Any way to check? Thanks
Water pump probably.
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  #3  
Old May 20th, 2015, 10:53 PM
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Nate
1997/Defender 90 ST
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I loosened the radiator cap and plugged the overflow to see if I was getting blowback through the system (head gasket). Doesn't appear to be. Looks like the leak is coming off the top of the inflow on the pump from the radiator. The hoses look a little tough. Not sure what my next move should be.

How hard is it to change out the water pump? Any idea on total labor?

Thanks again

Nate
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  #4  
Old May 20th, 2015, 10:54 PM
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Dan Kemper
1997 D90 SW #278
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Easy job for DIY. Download the rave, orders the parts. Get a new thermostat as well. New gasket and new new pump.
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  #5  
Old May 20th, 2015, 11:01 PM
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Nate
1997/Defender 90 ST
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Thanks Roverdoc. Anything else I should look for before ordering the pump, thermostat and gasket? If I take off the belt the water pump pulley should have some play in it if shot correct? Any guidance is greatly appreciated. Thank you.
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  #6  
Old May 20th, 2015, 11:22 PM
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Dan Kemper
1997 D90 SW #278
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Well. Depending on service history, may be a good time to replace the viscous clutch that attaches to the pump and the fan. I like to think of the clutch, pump, gaskets, thermostat all in one job since you are there. If removing the fan, purchase the correct wrench. I have a park tool bicycle spanner wrench that works perfect.
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Old May 21st, 2015, 12:39 AM
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Chris Davis
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There is a weep hole under the pulley on the face of the pump that is designed to leak when pump is shot. If it was me, I'd remove the radiator to change the pump and do the step belt, have the radiator flushed (unless recently done). Not sure if I'd change the t-stat or clutch unless there was issue-- but if money is no object, then sure.
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Old May 21st, 2015, 01:00 AM
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Dan Kemper
1997 D90 SW #278
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Slippery slope. I would say if you have the radiator out then you may as well pull the motor and do a galvanized chassis as well.

Joking aside. I am currently deep into a refresh and the more I take apart the more I want to do. Ship fitters syndrome.
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