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johnnyv4449

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Posts: 37
Reply with quote  #1 
2009 Etec 250
E250DCXSEB


I was doing the pumps and shaft seals on my lower units. The port side pump was crusted with what looked like carbon or exhaust. 

I found a large piece of metal sitting in the lower unit. (pictures) Where did this break off of any ideas? Does anyone know of a diagram or video to take off the mid section of the lower half? It must be from the above the midsection? I put a camera up there and it looks as if it came off right above the mid section.   The third picture below shows that the right side is open and the left is closed. It also looked "rough" on the edges. You can actually see some deterioration on the left. I was trying to find a diagram or pics to better understand what the design of this is.

Judging from the looks of it, its been in there a long time. Being I alternate years on the pumps between the two engines, it was by chance that I found this. You would never know it by the way the engine runs, no issues. 

Any help would be great!

Johnny metal.jpg  pump.jpg20190524_122559.jpg


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1988 Wellcraft Coastal Rebuilt
Twin Etec 250's
Port E250DCXSEB
Stbd E250DCXSUG
PhilH12

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Reply with quote  #2 
First, you should call Barnacle Bill's and get a Service Manual for your engine.  A Parts Manual would also help with exploded drawings and P/N's for every nut and bolt on there.

That looks to me like a chunk of the Inner Lower Exhaust housing - based on the ribs, but that 3rd pic suggests that it could be the Upper one also.

Running with "no problems" may not continue for too long - blowing hot exhaust gas at the water pump and seals on there.

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
seahorse

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Reply with quote  #3 
What is the full throttle rpm on the motor when you have a normal load in the boat?  

Had there been overheat warnings ?

Has the exhaust back pressure fitting been inspected, cleaned or replaced recently?

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johnnyv4449

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Reply with quote  #4 
I haven't run it yet this year but on storing it in Jan there was no difference in the 2 engines. 5200 rpm if I remember. If your talking about the pisser on the back yes I inspect it. Usually I can tell if there s something stuck. Also I take them out to blow out the engine with fresh water. No overheating that I can recall. Sometimes a little finicky at idle but nothing major.

Do you think this is what i showed in the last picture. The right side? Do these corrode over time?

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1988 Wellcraft Coastal Rebuilt
Twin Etec 250's
Port E250DCXSEB
Stbd E250DCXSUG
PhilH12

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Posts: 3,503
Reply with quote  #5 
5,200 is way low for most anything except an I-3 motor.  Either over-propped or mounted too low, and Height is first to check.  Not sure how that all works with twins though - mostly want the AV plate above solid water and getting splashed on plane and trimmed, or you're dragging a sea anchor (LU's).

The exhaust back pressure fitting is a totally different animal.  The combined effects of that fitting being plugged and being over-propped will have you all carboned up inside, and replacing exhaust housings pretty regularly, not to mention wasting gas and oil, and slowly (or not so slow) destroying your engines.

Time for that Service Manual!

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
johnnyv4449

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Posts: 37
Reply with quote  #6 
yep time for that manual. Thanks for the info. I'm off on the RPM, should be 5600 if I remember correctly. I check when I run it but 5600 sounds right.

I'm almost scared to ask how big that job is to change out that manifold. Ill have to check and see which one it is that came apart. I guess after 500 hours and 10 years of use they just corrode like any other engine exhaust manifold in salt water.

Johnny





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1988 Wellcraft Coastal Rebuilt
Twin Etec 250's
Port E250DCXSEB
Stbd E250DCXSUG
steelhead

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Reply with quote  #7 

Over rich fuel mixture from leaking injector nozzles or too lean mix from plugged injectors will cause high exhaust temperatures which leads to burned out exhaust components.

Have the injectors tested and cleaned by one of the professional E-TEC injector service shops listed on the forum in threads.  Most of us do it every 5 years, critical running in salt water with salt exposure to the fuel.

Prop for 5800 normal load, then motor won't be lugging and overloaded which also burns out expensive exhaust components.

Too hot exhaust gases also burn out plastic and rubber shock absorbing prop hubs.  Hub slippage wastes HP and mpg.

johnnyv4449

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Posts: 37
Reply with quote  #8 

I took everything to my local etec shop and they knew instantly. That piece was from the 9 in exhaust extension. when I got home I looked and there was no extension in there. They said they replace them all the time. I bought a new extension and the seals and am going to install that.

Hopefully that it just corroded away. I,m going to have to go back and be religious to blowing out my engines every time I go out. I was a little lazy the past year or so [frown]


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1988 Wellcraft Coastal Rebuilt
Twin Etec 250's
Port E250DCXSEB
Stbd E250DCXSUG
seahorse

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Reply with quote  #9 
Remove and inspect your exhaust pressure sensor nipple also. Chances are it is also burned away if the motor has been overloaded or if running too lean.
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My sarcasm and my sincerity sound surprisingly similar !
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