Impeller fins orientation on a 2001

[joechrom]

So I kinda feel like a dumb a$$ here with this question, but I've put my impeller in backwards more than once and overheated. Only to pull it out of the lake, flip it back and make it work again. That being said my behind my house neighbor just happens to also have an 2001 (his is 89 and mine is 1988). The other day he was watching me change it and convinced me to put it in "his way". The dude is really smart and knows everything about everything and as stated above, I'm a dumb a$$, so I followed his advise and it overheated in 1.5 minutes. Got towed back, (by a beautiful nautique I might add) trailered up, flipped it around to my way. I have not dropped it in yet due to time. So let me post up and gather your thoughts. What's the correct convention.

I found this video on you tube and took a snap shot of it. Is this pic indicating the correct convention for a 1988 SN2001 w a Ford Windsor 351?


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[desertskier]

Your '88 is a reverse rotation engine (right hand). Your neighbors '89 is a standard rotation engine (left hand). But no matter which way the fins are installed they should correct themselves when the engine is running. Did you remove your raw water pump from the engine when you installed the impeller? It is easy to install the pump backwards which will result in no water flow and subsequent overheating.

[desertskier]

Here is a link to a thread that has a diagram of how the raw water pump should be installed. The diagram is about half way down the page.

[charlesml3]

Your '88 is a reverse rotation engine (right hand). Your neighbors '89 is a standard rotation engine (left hand). But no matter which way the fins are installed they should correct themselves when the engine is running. Did you remove your raw water pump from the engine when you installed the impeller? It is easy to install the pump backwards which will result in no water flow and subsequent overheating.

Agreed. It isn't about how the impeller is installed in the pump. It'll sort itself out. It's about how the pump is installed onto the engine. It's very easy to get it upside down.

-Charles

[joechrom]

Here is a link to a thread that has a diagram of how the raw water pump should be installed. The diagram is about half way down the page.

No link? And If you are saying maybe I have the pump upside down? Hmmm. How would I know that? I've been paying attention to the paint, I noticed on the top of the pump there was evidence of the paint coming thru the slot that allows adjustment which is on top. The bottom is just a bolt hole. But I would like to check the pump convention, let me know how to tell. Thanks.


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[joechrom]

Was it this link that you were trying to pass on to me?
http://www.correctcraftfan.com/forum...ller-direction
If so, I'll double check the location of the cam bolt. You are telling me my '88 is reverse rotation, so cam bolt facing outside. I'll double check but good news is that I never un did the hoses so I may have not messed this up.


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[joechrom]

Overheating update: took out the t stat and it ran cooler. I think that's the problem. I ordered up a new 160 deg one from skidim


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[gary s]

Normally 140's are used in those engines,Fuel injected uses the 160's

[joechrom]

Ski dim told me 143 was stock in the boat but "these engines like it at the 160", he said earthier will work. I've had the boat since 2002 and it has run at 160 the entire time so based on that and Vince's recommendation I choose the 160


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[joechrom]

Here goes.


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[joechrom]

Overheating update: when I replaced my T STAT I still over heat. But when I take it out I run cool b/t 140 - 160. Anybody know why that would be?


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[joechrom]

So the overheating Gremlin ended up being a lying temp gauge or sending unit. The IR heat gun caught in in the lie.


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[chefred112]

What was the fix? did you replace sending unit or gauge?....I'm running into something like this now...Lake past weekend the gauge shows right around 200 at speed, does go down when I slow down...so I thought it was impeller but pulled it and it looked good..then I looked at gauge and it's sitting at 200+.....

https://www.planetnautique.com/vb5/f...95-super-sport

[joechrom]

The fix was an infrared heat gun and shoot the engine. When then gauge says 200 plus and the engine block actual temp is 120 ish you know something is fail, either the sending unit or gauge. So I bought replacements for both. Last time I used. My boat it stayed cool for hours with the thermo stat in so it working correctly.

To prove out my cooling system I did the following.

1. drop my boat in the lake pop off the output hose from the raw water pump and filled the 5 gallon bucket and 15 seconds at 3000 RPM.
2. Now you know there's is water if it fills the bucket. I confirm no particles are in the exhaust risers (top of manifold) and make sure nothing was in and around the thermostat.
3. I removed my t stat and boiled it to confirm it opens as designed, I used a cooking thermometer to see at what temps it opened and closed.
4. To prove out the circulation pump (thru the engine). Removed the drain plug on the block for winterization while the engine is running and I confirmed that gassing it produces noticeably more flow out the hole.
5. For good measure I also replaced the raw water strainer o ring and the jar as my old one had a crack on it.
6. After fighting every hose and fitting and replacing the one suspect hose that had been dripping I figured that about everything you can do.

That's when I got the IR gun and now sure enough it's working fine. I still have yet to change out the sending unit and to try this nice NOS VDO 250 degree gauge I got off eBay but I will do so shortly. I have to say that between the advice I got from correct craft fan and more importantly Vince from SKIDIM I am no longer a dumbass. I know exactly how my boat cooling system function. And no you can't but the impeller itself in backwards as the fins will rip right around one way and be put in the direction your pump spins. You can however install the pump upside down, which I did not do, but I sure did read about it. For me it's easier to replace my impeller while the pump is attached to the hoses this way you never remove the pump.


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[joechrom]

nos 250 def installed.



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