Loud Screeching both engine sounds and no water out of exhaust

Mark Searay said:
yeah I’m hoping just external block or debris which will dislodge. was out on boat two weeks ago.
Opened and closed all seacocks today just to keep them from freezing up. They were pretty good, nothing too tight.
All pulleys and belts turning. The crankshaft pulley got really hot really quick. So powered it down. I did one motor at a time so I am sure it’s happening on both.
I just find it weird both at same time so can only put it down to a blockage as stated.

is there any electronics that run the pumps or all mechanical off belt?
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It's a good possibility your transmission cooler's are plugged solid from muddy water. you can try back flushing them with a hose
 
Pop the outlet hose off the back of the water pump and see if any water is flowing out when you start the motor you can move up the line from there until you find the blockage
 
+1 on checking that everything on the serpentine belt loop is turning. A year ago I had a similar issue and it was my alternator. It had locked up and the resistance slowed the belt enough not to pump water. It was squealing as the belt was slipping.

-Kevin
 
I had the same exact thing happen to one of my engines last summer.
Belt was squealing bad, no water out the exhaust, belt was tight.
On my 350, it has a bracket that holds the water distribution housing, and it bolts to the block with one of the alternators brackets.
Both bolts broke off out of the blue.
It was just loose enough to not turn the seawater pump.
 
I experienced something similar on port side engine. Turned out pulley bracket broke..
 
Dry impellers would only squeal for a short time if at all before the vanes melted off, creating silence and no water out the exhaust.

Hot crank pulley means friction somewhere. Hard to believe that both of anything would bind up on separate engines at the same time though.

As mentioned remove belts, turn anything that supposed to turn and look at your impellers and incoming water flow.
 
Mark Searay said:
I don’t have any tools with me at moment but I still find it hard to think on both engines belt is slipping at same time.
Will check next out.
i think I’ll call it a day/weekend.

I sincerely Appreciate everyone’s help and I will let you know results when restart in a weeks time.
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One lesson I've learned is to not get too hung up about the (un)likelihood of a simultaneous failure. Or to put it another way, it is what it is. Instead, keep your focus on one engine and troubleshoot that one engine down to the source of the problem. That diagnostic result may transfer to the other engine, or it could be a completely different problem yielding the exact same set of symptoms.

The natural tendency is to assume a common problem, and in most cases that is a good assumption, but sometimes shit just happens.
 
water pump on one, alternator on other or even the idler pulley doesn't have to be same thing on both motors.
 
bobeast said:
One lesson I've learned is to not get too hung up about the (un)likelihood of a simultaneous failure. Or to put it another way, it is what it is. Instead, keep your focus on one engine and troubleshoot that one engine down to the source of the problem. That diagnostic result may transfer to the other engine, or it could be a completely different problem yielding the exact same set of symptoms.

The natural tendency is to assume a common problem, and in most cases that is a good assumption, but sometimes shit just happens.
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Thats exactly what my mate said - thanks for reply
 
OMG - this community is awesome! THANK YOU ALL for feedback and comments.

I removed the hose to the strainer and put compressor down hose back to the intake and was clear however scared to start the engines so employed a mechanic in case I do more damage restarting engines.

Had mechanic go on boat and guess what, half of you correct.
He found both alternators frozen and one pulley stuffed.
I said to him what are the chances of BOTH going at the exact same time???
He said one in a million and has happened. Lucky I was docked at marina.
I bought a boat with two engines in case one fails - to have TWO fail exact same time with exact same prob WTF!

I am dreading the quote - hopefully not too much.
He said because they were frozen essentially, it was causing the belt to make the squealing sound.
I just cant believe it.

I have had the boat for 3 months.
He said the pumps were done recently, which I confirmed, less than 12mths ago.
He said the leaking pumps corroded the alternators hence the failures.
I still cant believe exact same prob at exact same time.
Thanks everyone again and hope this post helps someone else
 
Mark Searay said:
OMG - this community is awesome! THANK YOU ALL for feedback and comments.

I removed the hose to the strainer and put compressor down hose back to the intake and was clear however scared to start the engines so employed a mechanic in case I do more damage restarting engines.

Had mechanic go on boat and guess what, half of you correct.
He found both alternators frozen and one pulley stuffed.
I said to him what are the chances of BOTH going at the exact same time???
He said one in a million and has happened. Lucky I was docked at marina.
I bought a boat with two engines in case one fails - to have TWO fail exact same time with exact same prob WTF!

I am dreading the quote - hopefully not too much.
He said because they were frozen essentially, it was causing the belt to make the squealing sound.
I just cant believe it.

I have had the boat for 3 months.
He said the pumps were done recently, which I confirmed, less than 12mths ago.
He said the leaking pumps corroded the alternators hence the failures.
I still cant believe exact same prob at exact same time.
Thanks everyone again and hope this post helps someone else
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So glad you got it figured out. Keep us posted as to the outcome. I'm starting a bragging-rights pool. I say the final bill will come in at $1363.43. any takers?
 
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I once had both water pumps blow within an hour of each other. The guy that did them installed the pulleys wrong and they lasted 3 months before the bearings failed ..at pretty much the same time. So it happens.

side note: replaced both pumps with preinstalled pulley versions from the factory. I did them myself after some reading and vid watching (most info found here). I had zero mechanical experience before owning a boat and now do all of my maintenance aside from anything major like a tranny rebuild or head replacement etc. it’s not hard to learn and will end up saving you 1000’s upon 1000’s of $$$. Replacing two alternators should be a 30min job and the cost of the alternators. Good luck! Happy boating!
 
M Prod said:
I once had both water pumps blow within an hour of each other. The guy that did them installed the pulleys wrong and they lasted 3 months before the bearings failed ..at pretty much the same time. So it happens.

side note: replaced both pumps with preinstalled pulley versions from the factory. I did them myself after some reading and vid watching (most info found here). I had zero mechanical experience before owning a boat and now do all of my maintenance aside from anything major like a tranny rebuild or head replacement etc. it’s not hard to learn and will end up saving you 1000’s upon 1000’s of $$$. Replacing two alternators should be a 30min job and the cost of the alternators. Good luck! Happy boating!
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Nice boat , like the extended cover too - as I am new to this, I would rather pay a little more and get a pro onto it until I feel more comfortable.
I have done some of the electrics myself (eg replacing switches etc) on the DC breaker board because LED gone out.
 
Mark Searay said:
.
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So I had a seal on one of my raw water pumps go out and on my boat (probably as well as on yours) the serpentine belts are aligned athwart-ships. Sea water was blowing across both belts, alternators and all pulleys. needless to say, I replaced all rotating parts.

On another note, I once had my boat hauled out for a couple of weeks, my batteries were very low but I was able to get the engine started. The load on the alternator was so great that the alternator failed and seized. The alternator held the belt still while the crankshaft spun, making a huge squealing sound for a moment or two, just before it burned through the belt.
 
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