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  #51  
Old 03-15-2018, 08:18 PM
Rjones14 Rjones14 is offline
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Boat: 1985 S&S
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My hoses are 12” long at best. I’m assuming that means the previous owner put longer exhaust pipes on there?
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  #52  
Old 03-15-2018, 08:24 PM
waterlogged882 waterlogged882 is offline
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Boat: 93 190
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Yes...I agree.....

I have looked at this again and can see what you mean other than what I think I would have been looking for.

Your photographs are looking into the exhaust hose and down into the entry point of the muffler? That is just a very short piece of hose and not what I was expecting to see, however someone else may have re-engineered that system to be there like that. If you think I am blind...well??? maybe...but I was not seeing what I expected to be looking at.

Form other boats I have worked on (the previous photographs) you can see the difference.


Something is restricting or not providing cooling flow.... What kind of muffler is beyond the hoses? Straight pipe? OEM muffler? etc.?

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  #53  
Old 03-15-2018, 08:39 PM
Rjones14 Rjones14 is offline
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Boat: 1985 S&S
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The pictures are from the exhaust hose end, back into the riser.

There’s no muffler.

I agree, somewhere there’s blockage that’s allowing the engine to cool, but restricting flow to the risers causing them to heat up.
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  #54  
Old 03-15-2018, 08:45 PM
waterlogged882 waterlogged882 is offline
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Quote:
Originally Posted by Rjones14 View Post
The pictures are from the exhaust hose end, back into the riser.

There’s no muffler.

I agree, somewhere there’s blockage that’s allowing the engine to cool, but restricting flow to the risers causing them to heat up.
OK, either direction, I see what you are showing now. That was just unexpected.

So what goes from the end of the hose to the transom of the boat to the exhaust port openings?

Has that engine ever been in salt or brackish water?

What I would expect to see is the riser with an exhaust hose attached, then down in the bilge, a muffler (or some sort of exhaust pipe) then a short piece of hose tying the muffler to the transom exhaust port.

Your hoses are on the inside of the primary stringers due to your particular year configuration. MC moved them in the 82 year model.

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Last edited by waterlogged882; 03-15-2018 at 09:04 PM.
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  #55  
Old 03-15-2018, 09:05 PM
Rjones14 Rjones14 is offline
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I have what appears to be 3” exhaust pipe running from the transom back to the motor, making a 45 up to the riser, where the two are connected with a short piece of hose.
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  #56  
Old 03-15-2018, 09:15 PM
waterlogged882 waterlogged882 is offline
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Originally Posted by Rjones14 View Post
I have what appears to be 3” exhaust pipe running from the transom back to the motor, making a 45 up to the riser, where the two are connected with a short piece of hose.
Makes sense. Why I was asking was to further try and figure a point where there may lie an issue.

Salt can corrode and build up in the heads restricting circulating output flow too.

So let's work backward and see what is next. This is a pretty simple system. Some of the other posters here may be the winner.....
I would not put it back together without removing everything at this point to check for possible obstructions. You're too far into it not to rule out (or find) the issue.

Here is a photograph of the raw water pump and (bad) impeller. The impeller has to be good and also has to turn at the core. I have seen them break loose...look brand new and not be spinning at the core.

Also the last photograph is of the 85 OEM I worked on last week. That is what came out of the factory.

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  #57  
Old 03-17-2018, 09:02 AM
1100gregn 1100gregn is offline
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Boat: 1990 prostar 190
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my fuel starvation was exactly that some form of leak in fuel line drove me crazy until i figured it out replaced fuel line runs perfect
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  #58  
Old 03-17-2018, 05:03 PM
Rjones14 Rjones14 is offline
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Originally Posted by 1100gregn View Post
my fuel starvation was exactly that some form of leak in fuel line drove me crazy until i figured it out replaced fuel line runs perfect
Getting ready to replace mine, hoping that will fix my problem.
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  #59  
Old 03-17-2018, 05:06 PM
Rjones14 Rjones14 is offline
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Raw water pump....
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  #60  
Old 03-17-2018, 06:02 PM
waterlogged882 waterlogged882 is offline
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Winner winner chicken dinner. That one is shot. I have seen better and I have seen worse....there is your flow impedance.

Discount Inboard Marine - part number 0712 and buy a spare.

The raw water pump requires specific orientation upon reassembly. Looking on the impeller housing, the stamped word "Sherwood" goes to the engine block side.

Also you need riser gaskets - part number 0814 (specific orientation upon reassembly is required) quantity (2)

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