Rickie B Posted April 20, 2017 Report Share Posted April 20, 2017 i will be replacing my water pump on my 85 720,what is the difficulty level ? and is there anything i need to know to simplify the job,don't want no big surprises.Thanks :confused: Quote Link to comment
Lockleaf Posted April 20, 2017 Report Share Posted April 20, 2017 Not terribly difficult to do. One or two of the bolts will not come out of the pump assembly. They stay in the assembly and will come with the new one. Its worth it in my opinion to remove the radiator to gain the extra space. If you don't have an ac condenser then you can undo and redo the fan bolts very easily by going through the front of the truck. 1 Quote Link to comment
Draker Posted April 20, 2017 Report Share Posted April 20, 2017 Remove the fan shroud, remove fan, remove fan belt, remove pump, clean up sealing surface with razor or scraper. Install new pump! Lockleaf is right though.. removing radiator would give much more space but does add to the job. Quote Link to comment
datzenmike Posted April 20, 2017 Report Share Posted April 20, 2017 Disconnect battery. Take the rad out. Take the fan off now. It has to be swapped anyway. Loosen alternator belt adjustment to get the fan belt off. There are 12mm and 10mm bolts to loosen and remove. (yes at least one 12mm long bolt comes out with the pump) Have a good quality gasket ready. You do NOT need RTV sealer on it. It only squeezes from between the mating surfaces when tightened and ends up in the cooling system and eventually in the rad or heater, plugging it. This is what the gasket is for! Chevy owners don't know what gaskets are for. Replace everything and top up rad. Belt tension is correct when you can push on the belt with your thumb very firmly between the pulleys and the belt moves about one belt width, If any coolant is left over, put it in the coolant recovery bottle. Next time the rad cools down it will siphon in and self fill. That's what it does. Warm engine check for leaks. Always run a quality anti freeze/coolant mix. Quote Link to comment
Rickie B Posted April 20, 2017 Author Report Share Posted April 20, 2017 Thanks guys,appreciate all your help,does not sound to tough at all,just a little time consuming Quote Link to comment
richamor Posted April 23, 2017 Report Share Posted April 23, 2017 I'd take the opportunity to replace the t'stat, rad hoses, and heater hoses as well. Use new clamps. Do a system flush and you should be cool for a long time. And datzenmike makes a good point. Always run a proper mix of quality anti freeze and distilled water. I generally run the 50/50 mix at NAPA and have never had a problem with it. Quote Link to comment
captain720 Posted April 24, 2017 Report Share Posted April 24, 2017 Definitely a good time for a rad flush. Quote Link to comment
Rickie B Posted April 24, 2017 Author Report Share Posted April 24, 2017 Thanks guys for all the good advice,the water pump install went perfect, not one set back.As for the condition of the cooling system it is in perfect condition,it was all replaced when the motor was rebuilt about 20K miles ago.Looks like when they replaced the water pump at the motor rebuild, they used RTV or some kind of red gasket sealer,this actually deteriorated the gasket and started leaking.I replaced it withe a new Napa water pump and gasket and NO gasket sealer and used Napa 50/50 coolant ,test drove and all is good.Thanks again for all your help and advice it made the job so much easier. Quote Link to comment
captain720 Posted April 25, 2017 Report Share Posted April 25, 2017 Great, that is weird. Everything went smoothly for a Ratsun member? :rofl: Quote Link to comment
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