Quicksilver maniforld welding

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by northern, Oct 2, 2018.

  1. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    I have one bolt tab that broke off the heat exchanger where it connects to the engine. Has anyone ever had this welded back on. The piece that broke off is solid and not burn by exhaust gas but the break is covered in carbon from the exhaust. Break is 1/2" long and piece is 3/8" thick.
    Does any one know what material the heat exchanger is made of. It is cast and could be aluminum or pot white metal.
     
  2. Espos4

    Espos4 Active Member

    560
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    I’m not sure what it’s made of but,
    Does a magnet stick to it?
    That could confirm or rule our aluminum.

    Another option is to briefly hit it with a grinder and see what color the sparks are.
     
  3. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Not magnetic, it is not corroded and is shiny.
     
  4. Espos4

    Espos4 Active Member

    560
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Could be aluminum or stainless steel
     
  5. Handsome Transom

    Handsome Transom Active Member GOLD Sponsor

    246
    Jan 26, 2018
    Penetanguishene Ontario Canada
    1989 SeaRay Sundancer 268 454 Bravo
    454 Mercruiser bravo drive
    I bet a prop and sķeg repair person could fix it if you bring it to him .
     
    Last edited: Oct 2, 2018
  6. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Good point it looks like the material my the stern drives were made of on my OMC 1982 boat.
     
  7. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    Take it to a welding whop that has TIG capability and let them determine the base metal.

    It would be just like Mercruiser to make the housing out of aluminum then chuck it full of brass tubes them expect it to last until the warranty expired. My guess is that the heat exchanger housing is cast bronze.
     
  8. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    Northern...you have 7.4s, right? I've never heard of aluminum manifolds in 7.4s. They tried that experiment in the 8.1s when they first came. Must be aftermarket parts? There was a company who made stainless exhaust components for 7.4s. A friend tried them and had nothing but problems. VERY expensive and futile experiment.
     
  9. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    Ron,

    I think he has an ear broken off of a heat exchanger.............
     
  10. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Heat exchanger is on the KW quicksilver generator. the 7.4 heat exchanges I replaced from mr cool.
     
  11. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Is he talking about his Quicksilver generator?
     
  12. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Damn, I hesitated.

    Anyhow, my bet is cast iron. I'm sure you would know if it was bronze?
     
    Last edited: Oct 3, 2018
  13. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    Whoops....sorry. I messed that one up. Was thinking manifolds.

    Heat exchangers are copper, aren't they? I'd bet a radiator shop that does marine heat exchangers can repair that easily.
     
  14. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    The manifold is integral with the heat exchanger. It is all one piece cast. The material is not bronze the tubes in it are probably bronze. The material is non iron base it is a white metal. It looks like the same material the legs on stern drives are. If any one has welded legs it might be the same process. I had an old leg once that the mechanic used epoxy based material and it worked. The repair was for a hole so no strain on the area.
     
  15. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Update
    Took heat exchange to reputable machine shop. They welded the bolt tab back on and machined the surface. Looks good. Cost $450 CDN or $340US.
    Material is aluminum and was easy to weld
     
  16. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    More update
    Took the heat exchanger to my favorite rad shop with pictures of what it looked like when I took it out and also a detail drawing from the service manual of the generator. They were skeptical of what they could do. They had to hand make all the gaskets. Got it back a couple of days ago looks good. Cost was $380 CDN or $280 US. In the spring we will find out how it works. Sure beats getting a new generator. Only corrosion was the end cap. I had replaced that in 2009. Got part from ASAP. They no longer have the part.
     

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