1989 454 (7.4) no water

[tomschauer]

If you have the intake and outlet hose correct, the seacock is open and you goosed it for several seconds it should be good to go.
I have the same engines. I see you are in texas with warm water. could there be growth over the inlet?
Maybe disconnect the inlet at the pump and blow back through the line to the through hull to make sure it is clear?

[tomschauer]

Another thing to check is when you pulled the old impeller were all the fins there? If not they are most likely lodged somewhere restricting the flow.
You would need to back flush the system to get the old pieces out of there.

[buster53]

Ok, the OP already said when he pulled the old impeller, it was fulled intact, almost looked new. He also said he has good water flow from the water intake hose, so there is no blockage there or at the intake strainer.

[Viper]

There's been some questions posed that need to be answered so we can narrow things down, otherwise we're just taking shots in the dark.

[CptBacardi]

Hey Viper, I haven’t had a chance to work on it again yet, but yes it’s a V drive (I don’t know about Walter?) and yes it’s a hollow swim platform discharge.

[ColRon]

Viper, on an 89 3867 Santego, he should have remote mounted Walter V-drives, located under the salon floor. I have the same model, while I have crusaders, I believe he has Merc's.

CptBacardi, Like Viper suggested, follow your raw water pump out line to the oil cooler and from there to the engine. disconnect the hose from the engine, start and see if you have flow. If not, then disconnect at the inlet to the oil cooler and check again. If you have flow to the oil cooler, but not after, the oil cooler is plugged. If no, flow at the oil cooler inlet, then the problem is with your raw water pump.

[Viper]

Thanks Ron.

Keep in mind that the water flows through the Walter v-drive first. You should also know that just because water is present at the pump, doesn't mean there is no restriction, so you need to test as mentioned previously. As mentioned, you also want to ensure the flow through the platform isn't throwing you off such that you're chasing a cooling issue you may not even have.

Again, if everything else checks out, I'd be curious to know what measures you took when you dismantled the pump. Did you mark the hoses and pump ports to ensure they got reinstalled the right way? If not, it's very simple to hook them up wrong especially in your case since it's likely you have a counter-rotating engine. If all you did when reassembling was look at how the hoses on the other engine pump were hooked up, then chances are they're hooked up wrong as the "OUT" port on the pump changes depending on engine rotation. It's a very common mistake. If the pumps on both engines are mounted exactly the same and the housing is in the same orientation, and the intake hose is connected to the same pump port on both engines, that's likely your problem as I suspect you have a counter rotating engine. It's easy enough to tell by cranking the engines and observing rotation. Water gushing out of a disconnected hose on the engine as mentioned above would also be telltale that the pump is hooked up properly.

Let us know what you find with these steps but looking at the position of the hoses on the pump will give you a quick idea of where you need to go next.

[CptBacardi]

Thanks for all the help. What I can tell you is that this is the port engine (Merc) and the inlet hose is installed on the bottom port of the impeller housing, just like when I took it off. I just removed the hose and cut it fresh, about 2” removed. Reinstalled. Still no water coming out the exhaust.

[CptBacardi]

Source of the post Viper, on an 89 3867 Santego, he should have remote mounted Walter V-drives, located under the salon floor. I have the same model, while I have crusaders, I believe he has Merc's.

CptBacardi, Like Viper suggested, follow your raw water pump out line to the oil cooler and from there to the engine. disconnect the hose from the engine, start and see if you have flow. If not, then disconnect at the inlet to the oil cooler and check again. If you have flow to the oil cooler, but not after, the oil cooler is plugged. If no, flow at the oil cooler inlet, then the problem is with your raw water pump.

Trying to locate the oil cooler, where is that? It’s difficult for me to get any visual under the engine. The outlet hose from the impeller goes under the engine and I’m unable to determine where it goes. If I need to instead pull the “T-start hose” to check flow... we’ll, I don’t know what that is ☺️

[bud37]

Try a mirror, those magnifying ones work great for looking an spots your head doesn't fit....