Exhaust risers do it yourself??

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

  1. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    tdshafer. was that boat in NewYork? I know its salt water but not like it is down here in south florida. I lived in Longisland and worked in freeport and its amazing how much worse the corrosion is here than there. Even Mercruiser didn't believe us until I would send them the parts back and actually they came a few years ago to see for themselves.
     
  2. tobnpr

    tobnpr New Member

    Nov 12, 2006
    New Port Richey, Florida
    1988 300 DA
    tw 350's w/ Alphas
    Unless the parts they quoted you are titanium, you can save a lot more than 20% by DIY'ing.

    http://marineengineparts.com/shopsite_sc/store/html/page350.html

    Manifolds, risers and gaskets are in the $600 range per engine- for either Barr or Osco.
    I've had no issue with either brand, used them both, and as far as I'm concerned there's no justification for getting bent over to have these be "OEM" with a Mercruiser label on them.

    Do you mind providing the detail of their parts estimate- I'd like to know how they get to $4000?
     
  3. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    tobnpr. the exhaust you are telling him aren't the correct exhaust for his boat. those are all for the older motors. His has the dry joint which are allot more expensive. The price MM quoted him are probably list price from mercrury.
     
  4. jeffk

    jeffk New Member

    273
    Apr 28, 2009
    Sarasota, Florida
    2006 300 Sundancer
    5.0L Mercruiser w/Bravo III
    Labor, Labor, Labor.............The deception of the work involved. I was intimidated at first by the cost, till I did it myself, peice of cake, just time and effort,
     
  5. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    yup you can save $1000
     
  6. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    okay, I got the all parts priced at around 3600 and labor at $400
    4
    BALL-CHECK @ $1.00
    $4.00

    4
    CONNECTOR @ $20.06
    $80.24
    2
    FITTING @ $26.82
    $53.64

    2
    FITTING @ $26.82
    $53.64


    4
    ELBOW EXHAUST @ $289.43
    $1,157.72

    4
    MANIFOLD EXHAUST @ $343.34
    $1,373.36

    2
    KIT 3" RISER @ $461.08
    $922.16
     
  7. flarepoman

    flarepoman Banned

    390
    Jul 18, 2008
    More idiots here to
    boatless
    boatless
    Here is a picture of mine done with GLM aluminum ones powder coated for about $695.per side W all gaskets plugs.
     
    Last edited: Mar 2, 2010
  8. tobnpr

    tobnpr New Member

    Nov 12, 2006
    New Port Richey, Florida
    1988 300 DA
    tw 350's w/ Alphas
    "Dry joint"?
    Can you explain?
     
  9. 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
    I didn't think the aluminum manifolds held up well in saltwater - how long have you had them? Do you flush after each use?
     
  10. tobnpr

    tobnpr New Member

    Nov 12, 2006
    New Port Richey, Florida
    1988 300 DA
    tw 350's w/ Alphas
    Aluminum holds up fine in saltwater...they build hulls outta the stuff.
     
  11. 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
    Yeah - I've thought about that and it didn't make sense - but I've heard the manifolds were a different story for some reason. dunno...
     
  12. tobnpr

    tobnpr New Member

    Nov 12, 2006
    New Port Richey, Florida
    1988 300 DA
    tw 350's w/ Alphas
    You may be right...

    I was wondering about the heat issue, and whether aluminum can take it. I guess so, or they wouldn't make them (presumably).

    I've see the SS ones, but never aluminum.

    At that kind of cost- double "standard type" manifolds and risers- I'd sure be looking at alternatives if there are any.
     
  13. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    All the 8.1 mercruiser pre 2004 had aluminum exhaust manifolds and I loved them. Why? Because almost everyone rotted out and dumped water back into the exhaust ports and filled the motor with water. It gave me LOADS of work. After that they came out with the cast iron manifolds to replace the aluminum onesand they been using them since. I don't think I have any around now but if I do I'll take a pic of it.
     
  14. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    Oh and dry joint. I'll be at mercury school all next week. I'll try to take a pic of the exhaust and of a gasket and you will see a difference. With the new exhaust systems you cannot have a riser gasket leak and water drop into the exhaust ports. You will understand when you see the pictures. Actually the dry joint is now the old system and the have the catylist motors ( yes catalitic converters like a car). You think you exhaust is heavy now! Just wait. And you think you exhaust is expensive. You should see the prices! good lord.
     
  15. Hampton

    Hampton Air Defense Dept TECHNICAL Contributor

    Nov 26, 2006
    Panama City, Fl
    2008 44 Sedan Bridge
    Cummins QSC-500's
    Straight Drives
    Can you say dissimilar metals, at high temp, in a salt bath...
     
  16. trit21

    trit21 New Member

    Dec 16, 2007
    Live, Orlando: Boat, Ft. Pierce
    See signature
    See signature
    I know right. You would think that the Mercury engineers would think about that. They have been making engines in salt water for some time now right? Just shows you it is all about saving money at the beginning, don't worry about the millions it cost in repair they saved money initially. Just stupid.
     
  17. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    Removed the manifolds and risers today. not difficult at all.

    one of the Port engines water ports on the riser was clogged down to a 16th of inch hole ,,makes sense as engine was running a little warm,, the rest looks rusty and in need of replacement, I am glad I did not extend for another year

    I need to get a few more parts, I.e the manifold gasket ,,and and elbow, but should be finished tomorrow.


    FLFLATRATE... I looked up the torque specs and they indicate 20ft lbs for the manifold, is this correct?

    WATER HEATER

    Also I removed the water heater,, what sa PITA!!, will put the new one in before I button up the port engine manifold as this give me more room.

    The engine water inputs for the water heater were completely clogged and corroded , causing my leak. so i will cap these off going forward...
     
  18. 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
    Panchita, are you replacing mannys too or just risers/elbows? You have any photos of the manifold passages? I'm curious what they look like after 3 (was it 4??) seasons of Floriday usage. Here's what my (likely original) manifold passages looked like when I pulled them a few months back. I'm guessing they're original b/c the left and right side of the flange of each manifold port features different thicknesses, which necessitates bolts that are two different lengths. The new design has each side of the flange the same thickness. Keep in mind this is a 20 year old boat with full factory FWC, used always in fresh-brackish water...

    [​IMG]

    [​IMG]
     
  19. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    I will take some photos. your boat must have a heat exchanger as I can see the antifreeze.. keep in mind my boat runs sea water through it so it corrodes faster,, and particulate matter builds up and clogs things up..
     
  20. 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
    Yes, these engines are fresh water cooled (FWC). The passages were in good condition considering their age - what necessitated replacement was the deterioration of the mating surface at the top of the manifold. The gasket was failing on one manifold b/c of poor contact and the others were likely soon to follow. This turned out to be a nightmare of a job - imagine what the bolts looked like after 20 years!! It's a miracle only 4 broke and one needed the head cut off (it rounded).
     

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