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1989 454 (7.4) no water
- CptBacardi
- Deck Hand
- Posts: 93
- Joined: June 11th, 2017, 5:02 pm
- Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
- Location: Texas
- Has thanked: 3 times
Re: 1989 454 (7.4) no water
- CptBacardi
- Deck Hand
- Posts: 93
- Joined: June 11th, 2017, 5:02 pm
- Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
- Location: Texas
- Has thanked: 3 times
Re: 1989 454 (7.4) no water
- bud37
- Admiral
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Re: 1989 454 (7.4) no water
Those little pumps pull hard and even a minute air leak will short circuit the pump on the suction side....check your hose connection , if it is old cut some off and reconnect to be sure....if the new impeller has been run without pumping water for even a short while then it will need replacing.
I have had that little suction air leak before and that is just how it appears.
- CptBacardi
- Deck Hand
- Posts: 93
- Joined: June 11th, 2017, 5:02 pm
- Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
- Location: Texas
- Has thanked: 3 times
Re: 1989 454 (7.4) no water
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- CYO Supporter
- Posts: 5799
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
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Re: 1989 454 (7.4) no water
Is this raw water or fresh water (engine coolant) cooled? A clogged oil cooler will restrict flow, so will a clogged heat exchanger if applicable.
Do you have sea strainers and are they clear? I assume the seacock is open? Do you have Walter V-drives separate from the engines?
Was she pumping fine before the impeller change?
- CptBacardi
- Deck Hand
- Posts: 93
- Joined: June 11th, 2017, 5:02 pm
- Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
- Location: Texas
- Has thanked: 3 times
Re: 1989 454 (7.4) no water
- km1125
- Admiral
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Re: 1989 454 (7.4) no water
CptBacardi wrote:Source of the post It’s a plastic housing and it appeared ok. It’s raw water to the inlet side, and that hose was flowing water just fine. No coolant exchanger or anything. Just raw water. There is a part on the engine that looks like a water pump on a car, does it not do anything?
As I noted in post #2...
There is a separate pump that circulates water around the engine, but that has nothing to do with the raw water coming in or going out.
If you really ran that impeller up to 4000 rpm while dry you should probably replace it again... or at the VERY least pull it out and check it out. Even with a little soap in there that just works for the first few hundred rpm. If I had to take the hoses off to get to the impeller I try and fill them as much as possible before I reconnect them. If water's not available, I just use some PG antifreeze because it's pretty slippery too.
- CptBacardi
- Deck Hand
- Posts: 93
- Joined: June 11th, 2017, 5:02 pm
- Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
- Location: Texas
- Has thanked: 3 times
Re: 1989 454 (7.4) no water
- bud37
- Admiral
- Posts: 4676
- Joined: April 23rd, 2015, 10:22 pm
- Has thanked: 547 times
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Re: 1989 454 (7.4) no water
I used to clean the casting flash from around where the washers were seated.
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- CYO Supporter
- Posts: 5799
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 431 times
- Been thanked: 1586 times
Re: 1989 454 (7.4) no water
If everything checks out, I'll take this in a different direction; are you sure she isn't pumping water out the exhaust? Does your particular build run the exhaust discharge through a hollow swim platform?
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