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#568485 - 07/12/17 02:49 AM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
Joined: Oct 2014
Posts: 87
Boatbottom Offline
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Boatbottom  Offline
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Upstate NY
Hi All! As much as I would like the problem to be gone, it's not. Next on the list would be a problem on the suction side of the pump. The boat will have to come out of the water for this. My little economy car won't tow it so I'm waiting for a friend with a pick up. It will be a while before this happens.

Just for entertainment, I'll explain the the engine seems to be just fine, with no overheating at 1800 rpm. so....I've been cruising at at 1800rpm. At least I've been on the water.


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#568533 - 07/15/17 04:29 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
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WayWeGo Offline
Admiral
WayWeGo  Offline
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Joined: Aug 2005
Posts: 2,244
Oakton, VA

There are some things you can do on the suction side without pulling the boat out of the water. If you remove the hose going to the suction side of the pump, you can try blowing through it to see if there are any obstructions. If you are not able to blow hard enough to get bubbles to come out at the drive, you might be able to use a vacuum (with the hoses switched) or compressed air. This works well if there is a plastic bag or debris in the water passages.

Also, you can get in the water and inspect the outdrive to see if there is anything visible in the water intake area of the drive.



1975 Trojan F36 Convertible, Twin Chrysler 440's
2014 West Marine AL360 Inflatable, 1966 Mercury 6HP, 1992 Mercury 20HP
#568592 - 07/25/17 11:52 AM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
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Boatbottom Offline
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Upstate NY
The saga continues, pulled the outdrive and found shell pieces in the water passage. Cleaned that out along with the passage through the transom. Put it back in the water, idled the boat for 1 hour, in gear, and it was fine. Went for a ride went up on plane and seemed fine. As I was returning to the dock it overheated. So...I guess I wil continue the search.


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#568594 - 07/25/17 02:36 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
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tpenfield Offline
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tpenfield  Offline
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Cape Cod, MA
Were the shell pieces (barnacles, etc) in the lower unit portion of the outdrive, or were they caught in the inlet hose that attaches to the bell housing? The thing about salt water use is that things can grow in the lower unit passages and continually dislodge and get stuck in the inlet hose at the bell housing . . . so unless you got everything cleared up and all shell debris emptied from the outdrive before you put it back on, then more 'stuff' could be collecting up at the bell housing and reducing the flow.

If that all seems good, 'we' did not check the oil coolers (engine oil and power steering fluid coolers) that are after the sea water pump and before the thermostat housing, IIRC. Those inline coolers can get clogged with sea weed and marine life debris, and restrict the flow.

You will want to open up the hose on the inlet side of those coolers and see if you got a clump of 'stuff' or anything blocking the flow.

Final thing (if it gets that far) is to check the condition of the water passages in the exhaust manifolds and elbows. Those can get blocked up with rust scale, which reduces the overall flow of cooling water through the engine.

Last edited by tpenfield; 07/25/17 02:37 PM.

Regards, Ted

Formula 330SS

My Boat Web Sites
#568642 - 07/28/17 03:35 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
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WayWeGo Offline
Admiral
WayWeGo  Offline
Admiral

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Oakton, VA
If you think there might be shell pieces in the outdrive water passages where you cannot reach them, Barnacle Buster or Rydlime flushing will dissolve them and any marine growth. Not especially cheap, but it really dissolves them pretty quickly.

You can put the solution in a bucket under the drive and use a small bilge pump to put the solution in at the water inlet. The solution will go through the drive and end up in the bucket. You need to flush for a few hours.



1975 Trojan F36 Convertible, Twin Chrysler 440's
2014 West Marine AL360 Inflatable, 1966 Mercury 6HP, 1992 Mercury 20HP
#568686 - 08/04/17 11:52 AM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
Joined: Oct 2014
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Boatbottom Offline
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Boatbottom  Offline
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Joined: Oct 2014
Posts: 87
Upstate NY
Hi, sorry for the delay, but I'll fill you in.

After removing the shells, I discovered a problem with the water passage fitting that goes throug the transom. So that was replaced by a my local marina. I figured at this point, the problem had to be solved. NOPE!!! So on 8/1 the boat was hauled by the marina and the exhaust manifolds were pulled. They couldn't get any water to flow through the port side, and only a dribble through the starboard side. So....new exhaust maniflds, elbows and risers. As it turns out, Merc says the life expectancy of the manifolds in salt water is 10 years. The boat is 12 yars old. If I had known that I might have still bought the boat, but I would paid less. Or passed if we couldn't have come to terms. I was starting to hear noises from the circulating water pump,so that is being replaced also. I'm hoping to be back in the water on Monday or Tuesday and I have my fingers crossed that stuff will be OK

As always thanks for the input.


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#568687 - 08/04/17 01:24 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
Joined: Jun 2004
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Silverbullet Offline
Admiral
Silverbullet  Offline
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Posts: 8,793
Boise, ID
Bummer you had to go through all that. Sounds like you got some stuff figured out in he process.

Salt really does cause issues with manifolds and risers. It can also cause leakage into the cylinders with catastrophic results.

I hope you got it all solved.


James
2002 Cobalt 226 VP 8.1GIDP
2007 Chevy 2500HD Crew Cab Duramax
1988 Suburban 3/4 Ton
2000 Subaru Forester


#568688 - 08/04/17 04:29 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
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captkevin Offline
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captkevin  Offline
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Chicago, IL
At least it sounds like your problems are over & you should be go to go for another 12 years.


2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4
#568689 - 08/05/17 08:11 AM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
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tpenfield Offline
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tpenfield  Offline
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Cape Cod, MA
I assume that the marina initially did the 'Bravoitis' fix idn

It is interesting that they did not go any further or verify the cooling problem was solved. Lasting 12 years in salt water is good for a set of manifolds. The engine itself will be 'done' at about 20 years of salt water.

I've become a big fan of Full closed cooling systems for salt water boating, having done a tear-down of the engine on my prior boat, which was used 20 years in the salt.


Regards, Ted

Formula 330SS

My Boat Web Sites
#568943 - 08/24/17 04:01 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
Joined: Oct 2014
Posts: 87
Boatbottom Offline
Lieutenant Commander
Boatbottom  Offline
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Joined: Oct 2014
Posts: 87
Upstate NY
Hi everybody. Sorry for the delay in getting back. So....the manifolds did the trick. Since I am in fresh water, I am hoping for many trouble free years of boating. In the process it was discovered that the cooling system pressure sensor was bad, so that was replaced also. Regarding the "Bravoites" mentioned by tpenfield,yes it is fixed. I'm also smarter now, although who knows when I might actually buy another boat..

Moving down from the larger sea ray has presented some other adjustments in terms of storage space. The regrigerator is also way smaller, I might add a small refer, but having just paid for the boat repairs I might wait a while. On the brite side the weather guy says 5-days of good weather ahead and I have some boating time to make up!!!!!


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#568945 - 08/24/17 09:40 PM Re: Over heating 350 Merc MPI Bravo 2 [Re: Boatbottom]  
Joined: Oct 2003
Posts: 7,139
captkevin Offline
Admiral
captkevin  Offline
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Chicago, IL
Glad to hear your issues are repaired.


2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4
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