Quote:
Originally Posted by TomH
First off, what engine do you have. I only ask because there's certain vintages of PCM engines where the pump can be installed backwards, and it won't pump (not sure if this may have happened after you reassembled after clearing your blockage).
On to your questions:
1. It's never a bad idea to swap in a new impeller. I like tossing in a new one in the spring, but if you do use the same one, it's a good idea to pull it from the pump during the winter, otherwise the vanes can take a pretty good set.
2. Fake-a-lakes won't always have enough pressure (before leaking out the plunger) to push through a raw water pump that's not drawing. Generally, they'll need the pump to prime up and help draw the water. Rather than a fake-a-lake, I prefer to plumb a valve and tee into the intake - then I can do a direct hose connection to the intake, and not worry about the plunger falling off.
3. From your description of where your blockage was (after the raw water pump), it doesn't sound like your pump was necessarily running dry, but rather not able to push any water into the engine. That being said, running an impeller dry for any period of time tends to kill them.
4. It could have a good set to it from being unused for a few months and be contributing. Again, I'd just swap it out to knock it off the list. Also possible that the impeller hub separated from the rubber and it's just spinning the hub.
5. See #2, plumbing in a flush line on the intake is easy and much more reliable than a fake-a-lake.
To Koolaid's comment about the impeller being installed wrong - that's not possible. While you can install it with the vanes initially in the wrong direction, as soon as the pump spins it will flip the vanes over to the correct orientation.
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1. I agree I just hate the cost and was trying to be a cheap a$$. like you I think the vanes setting like that all winter didnt help the situation much
2. I feel the same way about the fake a lake and how the raw water pump works . Im going to plumb a valve and T into the intake just like you said I hate the uncertainty of the FAL. Although I have been using one for years .lol
3. I feel like it wasn't completely dry when I pulled it there was a small amount of water it but it wasn't like steaming or really hot so I think it might have been flowing a really small about of water . I also agree that blockage in the oil cooler killed the whole dang pump and its ability to suck and circulate
4. Im swapping it out today after work . I did turn the pulley while I had the impeller pump out and the could see the impeller moving inside but maybe I couldnt turn it fast enough to slip the hub either way its going by by