Exhaust risers do it yourself??

Discussion in 'Sport Boats' started by Panchita, Feb 23, 2010.

  1. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    I feel your pain!
     
  2. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    Not sure of exact torque spec off top of my head but I would use perfect seal on the orange rubber seal of the gaskets when installing.
     
  3. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    where do I get perfect seal?
     
  4. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    west marine, BOW maybe or any mercury dealer ( marinemax should have it Marty or Fernando in parts). you can use it on all fittings. when you torque bolts mounting the riser and extention do it in a cris cross pattern I don't use a torque wrench I cris cross tightening them and you will feel them start to get real tight then stop. Thats the point when the rubber seal on the water passages are compressed and its now tight against the center exhaust passage.
     
  5. springer3

    springer3 New Member

    173
    Feb 9, 2009
    Atlanta GA
    1996 215 EC
    4.3 liter Mercuriser LX
    It is true that many experienced mechanics forego using a torque wrench with good results. However, it is not recommended practice. Who wants fasteners to loosen down the road because they were under-torqued? Worse, who wants to deal with broken fasteners or damaged parts from over-torque? The margin between the two is thinner than you might think, and we are well-advised to follow the factory instructions for installing fasteners.
     
  6. flarepoman

    flarepoman Banned

    390
    Jul 18, 2008
    More idiots here to
    boatless
    boatless
    Here is a finished picture of the GLM Aluminum ones I installed 2 years ago. They were about $695.00 Per side
     
    Last edited: Mar 2, 2010
  7. tobnpr

    tobnpr New Member

    Nov 12, 2006
    New Port Richey, Florida
    1988 300 DA
    tw 350's w/ Alphas
    Wow- not much left of the mating surface on the lower section of that manifold...are those Mercruiser? I'd read somewhere that the OEM manifolds were worse with respect to those skinny little sections than some aftermarket ones. It just seems crazy that they'd design something like that where a few sixteenths of an inch is what separates the closed from the open side...

    I have a 6.0 Crusader where the elbows are also part of the FWC system. I don't understand why other manufacturers don't do the same.
     
  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
    Those were Mercruiser. The new ones are much beefier - these are very old and I guess over time, those walls get pretty thin.
     
  9. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    I don't know if you guys know but they are stop making the 8.1 now and they came out with the 8.2. Heres a pic of it with the latest and greatest catalist exhaust. son all motors bieng sold will have this sort of set up. I just delivered one to Suzie Ormond that has that system on it. Her motor was a 350 MPI. Still working on the dry joint picture. [​IMG]
     
  10. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    I'm at merc school this week and heres a picture of the dry joint exhaust on a motor without an extension. do you see the humps on the elbow? thats where the water flows thru. I'll try to find a gasket and take a pic of it tomorrow

    [​IMG]
     
  11. Quint4

    Quint4 Well-Known Member TECHNICAL Contributor

    Oct 6, 2006
    S.W. Ohio
    330 Sport Bridge
    5.7 MPI 350 Merc Bluewaters
  12. Nehalennia

    Nehalennia Well-Known Member

    Aug 22, 2007
    Marysville, WA
    2001 310DA twin 350 MAGs, Westerbeke 4.5KW
    Twin 350 MAG V-drives
  13. Quint4

    Quint4 Well-Known Member TECHNICAL Contributor

    Oct 6, 2006
    S.W. Ohio
    330 Sport Bridge
    5.7 MPI 350 Merc Bluewaters
    Good catch Todd....my bad.
     
  14. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    Re: Exhaust risers do it yourself?? UPDATE

    Almost finished with the job. Did it myself and it was pretty easy.
    No problems with rusty bolts, everything came off very easy and in fact the elbows, and manifolds could probably of lasted another season. I showed them to marine max and they were surprised they looked so good and asked if i flushed after every use and in fact I did 95% of the time, probably missed one or two but never let the boat sit long without flushing between uses. overall i got 3.5 years on them and they May have lasted 4 to 5 years , but I was being cautious..

    Hardest part was removing the Darn water heater,, it was leaking and basically had corroded at the connection for the hot seawater connection coming from the engine. If you run your boat in salt water and the heater uses hot engine water to exchange heat into your heater I recommend you remove this and cap off the outlets from the engine,, then just rely upon the electric element to heat water.

    The salt water just clogs the system up.
    I ordered a replacement and it is at the marina, so tomorrow I go and install the heater then finish my job.:smt038

    Anyone wanting to save money on the risers and manifolds ,, this is an easy job but you need to take your time and make sure to use,good parts.
     
  15. 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
    Congrats and GOOD JOB! Much more money to spend on gasoline now!
     
  16. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    All is working perfectly .. now I am going to change the raw water impellors....
     
  17. tcason

    tcason Member

    330
    Apr 21, 2008
    Maryland
    240 Sundeck
    5.0L 260 HP
    What brand manifolds and risers did you use?
     
  18. beachcombersc

    beachcombersc New Member

    576
    May 7, 2007
    Charleston S.C.
    1999 3870
    3116TA
    Whats your cost of parts so far?
     
  19. tdappleman

    tdappleman Active Member

    Dec 17, 2007
    Kill Devil Hills, NC
    1996 270 Sundancer
    New twin 4.3's - 235hp each with Alpha 1 Gen 2 Drives
    Good job!
     
  20. flarepoman

    flarepoman Banned

    390
    Jul 18, 2008
    More idiots here to
    boatless
    boatless
    I did it 2 years ago with aluminum GLM kits,about $1250.00 for both sides. Install new mounting bots.
    here is a picture
     
    Last edited: May 27, 2010

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