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1990 yj jeep water pump

4K views 7 replies 6 participants last post by  Nubby55 
#1 ·
Anyone have any tips on changing out water pump on 1990 yj jeep wrangler?
 
#3 ·
If yours has serpentine belt it requires a reverse rotation water pump
Also put in a new thermostat 195* with burp hole and do not get a fail safe
Stat
 
#4 ·
This is very important and don't trust the part guys. I asked for a reverse rotation pump and they didn't know what I was talking about. They brought one out and I pulled it out of the box and found the "R" for reverse stamped on the impeller. The parts guy looked at me and said "I learn something new everyday"
Scary from a parts manager!
 
#5 ·
Make sure of the rotation. Do you have v-belts, or serpentine?



Use a hose to flush out the block and head while the pump and thermostat is out.




Use the gasket with gasket sealer. Not RTV.

 
#6 ·
Ya know DREDnot, the breadth and depth of your knowledge of YJs is amazing. So when a relative newb asks a question like this, it is not meant as disrespectful. But why not use RTV? I have not heard this before. I am sure you have logical reasons. I have used RTV for years on thermostats. But if there is a better alternative...
 
#7 ·
RTV is one of those things that can be used for a lot of things, but its not really the best at most of them. It gets used by the factory because its cheap and easy to automate application and can be made, stored and dispensed in bulk. It works good in certain thin applications where the surfaces and wide, flat, and close tolerance. Like sealing a transfer case or transmission. Or, in certain thick applications with large gaps and uneven clamping forces. And for smearing on cracks and holes for emergencies.

Where it really doesn't belong are places that see heat and pressure. Like the cooling system.
The hard gasket can take the pressure and the permatex seals into the pores of the metal and gasket. It cures hard and tight with the heat. Where as RTV gets softer with heat and the pressure forces past its bond.

Another thing about RTV is surface prep and application. Different surfaces require different preps and primers and application times and bead sizes. Its not one size fits all.

You know how when you have the RTV squeeze out when tightening and form that little bead? Well those can drop off inside where you don't want them floating around. They can clog up oil passages...








These were in my 2012 liberty transmission filter after the first change at 38K
 
#8 ·
Thanks DRED I have tried to tell people the same thing over the years and most don't want to here it because some body they know once said to use it on every thing when it first hit the automotive industry, you do have a great way of explaining things so people lesson to you, Bravo.
 
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