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Gotta replace Water Pump; clean the Throttle Body too?

This is a discussion on Gotta replace Water Pump; clean the Throttle Body too? within the General Help forums, part of the LSx Technical Help Section category; Hello, Just got the news that my coolant leak is coming from the water pump on my 2001 Z28. The ...

  1. #1
    Member Thewilldog's Avatar
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    Gotta replace Water Pump; clean the Throttle Body too?

    Hello,

    Just got the news that my coolant leak is coming from the water pump on my 2001 Z28. The car has 177K miles, so it's probably a fair time for replacement. The shop quoted me a repair cost of $575. I think I can do it myself for less although I've not attempted the repair previously.

    I found this thread that contains a detailed write up of how to replace the pump:
    Water pump install

    I see that I've gotta remove the throttle body to get at the pump. I suppose that I may as well clean it while I have it removed. There are an number of threads that delve into sprays used to clean the TB, such as:
    Throttle body cleaner

    However, I don't see any corresponding guides on how exactly I'm supposed to clean the part. Is it similar to cleaning brake calipers where you just spray down all the surfaces inside and out with cleaner and let it drip dry and/or wipe away excess with a paper towel? Or is there more to it than that? I ask because I've never worked with the thottle body before.
    Last edited by Thewilldog; 01-17-2013 at 07:12 AM.

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    Smiles for 9.5 Years cammed goat's Avatar
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    I spray throttlebody cleaner on a clean rag then clean the throttlebody with the blade open to get all the carbon/gunk out.

    As for the water pump, I think there are members who have replaced theirs without removing the tb. They just moved the radiator out of the way. I could be wrong.

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    Spaz is My Mentor SMWS6TA's Avatar
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    In regards to the tb, if you are going to soak it down remove the trottle position & IAC sensors. Those chemicals can effect the sensors. Now when you pull it off and get a look at the back side you'll see what needs to be cleaned, it will be covered in oil residue. I used some Q-tips to get the outlet that directs air into the valve cover. Carb cleaner is what I use.



    Water pump - Removing the TB just makes it easier to work on the water pump.

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    Senior Member raynor139's Avatar
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    Replacing the water pump is easy. One of the first engine related things I ever did to my car.
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    Member Thewilldog's Avatar
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    The internet is telling me that either one of these pumps will fit the car:

    ACDelco 252-846 Water Pump
    Bosch 99175 Water Pump

    and that I should get this gasket along with it:

    Fel-Pro 35635 Water Pump Gasket

    Can anyone who has replaced the pump using one of the above confirm that everything worked out?

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    Member robs98mysticZ's Avatar
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    i got an acdelco when i replaced mine works great and about the gaskets go to dealership for the metal gaskets there cheap and can be reused if wanted you will need two gaskets they are metal and rubber great pieces
    ive used gm gaskets with everything and seems there better and will last longer imo

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    Smiles for 9.5 Years cammed goat's Avatar
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    When I replaced the water pump on an 02 Suburban, the pump came with the metal/aluminum gaskets. Better than cork.

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    Both jobs are very easy. 525.00 is way out of line. You can do both with a few basic hand tools and a few hours of time.
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    Member Thewilldog's Avatar
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    Quote Originally Posted by robs98mysticZ View Post
    i got an acdelco when i replaced mine works great and about the gaskets go to dealership for the metal gaskets there cheap and can be reused if wanted you will need two gaskets they are metal and rubber great pieces
    ive used gm gaskets with everything and seems there better and will last longer imo
    I don't understand this response. Why would I need two gaskets? Is this the right one?


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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by Thewilldog View Post
    Quote Originally Posted by robs98mysticZ View Post
    i got an acdelco when i replaced mine works great and about the gaskets go to dealership for the metal gaskets there cheap and can be reused if wanted you will need two gaskets they are metal and rubber great pieces
    ive used gm gaskets with everything and seems there better and will last longer imo
    I don't understand this response. Why would I need two gaskets? Is this the right one?

    One for each side of the pump.
    1998 Trans Am WS6 - Phantom
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    Junior Member psycho_puppies's Avatar
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    water pump.jpgpump gaskets.jpg
    Thse are picts of the gaskets and where you attach the h20 pump to the motor. You don't need to take the TB off. I did the job in about 2 hours but I was being slow.

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    Member robs98mysticZ's Avatar
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    it takes longer to drain the coolant than anything, you need a flat head for the intake couplers, then a 10mm for the 6 bolts and pliers for the hoses, and a 15 or 16mm for your belt tensioner... you will also need to swap your tstat housing onto your new waterpump, when you put the new waterpump on put 3 bolts in partway to hold the gasket on one side, get the bolts started then slip the new gasket in on the other side using the bolts to make sure everything is lined up.

    - - - Updated - - -

    make sure you clean/scrape any old gasket residue off the front of the block as well

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    Member Thewilldog's Avatar
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    Quote Originally Posted by robs98mysticZ View Post
    it takes longer to drain the coolant than anything, you need a flat head for the intake couplers, then a 10mm for the 6 bolts and pliers for the hoses, and a 15 or 16mm for your belt tensioner... you will also need to swap your tstat housing onto your new waterpump, when you put the new waterpump on put 3 bolts in partway to hold the gasket on one side, get the bolts started then slip the new gasket in on the other side using the bolts to make sure everything is lined up.

    - - - Updated - - -

    make sure you clean/scrape any old gasket residue off the front of the block as well
    Curious, what did you do with the old coolant, kill weeds?

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    LSwut tep98ws6's Avatar
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    Put it in a well sealed container and bring it to Autozone or O'Rielly's ... they'll take it off your hands for free. Don't dump it, a lot of coolant is toxic to animals and that just makes for a bad day.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Quote Originally Posted by tep98ws6 View Post
    Put it in a well sealed container and bring it to Autozone or O'Rielly's ... they'll take it off your hands for free. Don't dump it, a lot of coolant is toxic to animals and that just makes for a bad day.
    This....I didn't know I had a coolant leak, one morning I found my neighbors cat its guts out next to my truck. As I pulled out of the drive way I saw the puddle and made the connection. Cat lived but doesn't come over to my house any more, so win, win....

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    Member Thewilldog's Avatar
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    Quote Originally Posted by robs98mysticZ View Post
    it takes longer to drain the coolant than anything, you need a flat head for the intake couplers, then a 10mm for the 6 bolts and pliers for the hoses, and a 15 or 16mm for your belt tensioner... you will also need to swap your tstat housing onto your new waterpump, when you put the new waterpump on put 3 bolts in partway to hold the gasket on one side, get the bolts started then slip the new gasket in on the other side using the bolts to make sure everything is lined up.

    - - - Updated - - -

    make sure you clean/scrape any old gasket residue off the front of the block as well
    Success! Took most of the afternoon, but I was able to swap the water pump with a new one as well as clean out the throttle body with some carb & choke cleaner. I also replaced the thermostat and housing.



    I actually had to remove two of the belt pulleys; the tension pulley and the pulley directly in front of the bottom right hand screw holding the pump in place. It was blocking my socket wrench. You were right, it did take a while to drain the coolant.

    Just got back from a test drive and didn't find any leaks and didn't over heat, so I think I'm good to go.

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    Member robs98mysticZ's Avatar
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    sorry i didnt respond when i did mine i had fresh coolant from my cam swap...if only the pump went prior to the swap lol....i drained mine into a CLEAN container and filtered it prior to reusing it. glad all went well for you!

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    Member Thewilldog's Avatar
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    Quote Originally Posted by robs98mysticZ View Post
    sorry i didnt respond when i did mine i had fresh coolant from my cam swap...if only the pump went prior to the swap lol....i drained mine into a CLEAN container and filtered it prior to reusing it. glad all went well for you!
    Only caveat, I didn't think the pump would come with the corresponding gaskets (it did) and I didn't realize they were sold in pairs (they are) so I now have two sets of gaskets I don't need and will probably never use. Oh well, good learning experience.

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    Smiles for 9.5 Years cammed goat's Avatar
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    When I changed the water pump on an 02 Suburban a few years ago, I had fun.

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