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  • #127819

    Jonathan St.Mary
    Participant
    Vessel Name: REJOICE
    Engines: Cummins QSB380
    Location: Maine
    Country: USA

    I bought a (nearly exact) replacement to what had been there.  I was able to avoid major rework of the area around the exhaust, which almost any redesign would have required.  I’m sure it will fail eventually.  If it does, I may go to some exotic material . . .

    #18887

    Jonathan St.Mary
    Participant
    Vessel Name: REJOICE
    Engines: Cummins QSB380
    Location: Maine
    Country: USA

    Got the elbow off the QSB380 with a combination of PB Blaster, brute force, and ignorance. The elbow has several pinholes between the water jacket and the interior. The interior is sverely pitted at eh wet end, though the dry end seems fine.
    Attached are a few photos – the really dark one is an attempt to show the pinholes, using a bright backlight in the water jacket.

    Sorry about the formatting – I don’t know how to make word-wrap turn on.

    #17845

    Jonathan St.Mary
    Participant
    Vessel Name: REJOICE
    Engines: Cummins QSB380
    Location: Maine
    Country: USA

    I will continue trying to get things apart.  Worst case is I snap the bolt heads off.  If that happens, I’ll pull the elbow, then weld a nut in place on the stud, and keep trying.  I’ve run into this sort of thing repairing old steam locomotives – just not in such confined space.

    #17517

    Jonathan St.Mary
    Participant
    Vessel Name: REJOICE
    Engines: Cummins QSB380
    Location: Maine
    Country: USA

    I’m going to remove the hump hose, and see if I can clean things up enough with the elbow in place to see what the condition is.  There isn’t much room, but maybe with bright lights and mirrors . . .  Right now, the bolts fixing the elbow in place are holding tenaciously.  Penetrating oil will be applied occasionally over the next few weeks, as I find time to get to the boat.  If that doesn’t work, I’ll try heat on the assembly to try to avoid snapping off the bolt heads. 

    #17514

    Jonathan St.Mary
    Participant
    Vessel Name: REJOICE
    Engines: Cummins QSB380
    Location: Maine
    Country: USA

    Pretty much the whole engine is below the waterline.  In fact, the waterline is about the same level as the axis of the turbo.  The outlet from the turbo turns 90 degrees and points straight aft, at a slight down slope of about 6 inches per foot.  Right after the hump hose, another elbow connects the exhaust to the side of the muffler.  After whatever happens inside the muffler, the exhaust comes out of the top of the muffler, and up and over the last arch before exiting under the boat.  The waterline is about 13″ below the bottom of the arch.  Picture attached.  You can see the mixing elbow on the right edge, the muffler, and the final pipe coming out of the top of the muffler.

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