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 am mechanically inclined and am wondering if it is worth it to replace all riser , exhaust manifolds etc as a do it yourself?

    Has anyone attempted this as a DIY?
     
  2. wakeup 19

    wakeup 19 Member

    595
    Nov 14, 2008
    (Medford)Boston Harbor to Cape Ann to Cape Cod and
    1992 300 Sundancer, Quicksilver ding w/ 6hp merc 4 stroke, anchorlift windlass, extended swim platfo
    t/ 350 merc's (carburated) alpha drives gen II
    It is an easy job! I would not pay anyone to do it if you have the tools. If not invest in them, should be an 2 hour job tops per engine. Make sure you clean gasket seats well and you should be all set. 8 bolts or so per side for the riser/manifold less the shifter assembly etc. Go for it!:smt038
     
  3. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    yea,, marine max quotes $5400.00 all in for the two engines!!
    Crazy,,
     
  4. HUMPH

    HUMPH Well-Known Member

    Nov 4, 2009
    SF BAY AREA
    2003 410DA,
    2004 C14 Caribe
    CAT 3126TA's 350HP/
    50HP Honda
    Do some research into the correct gaskets to use. Maybe one of the Technical Advisors can chime in there. After my engine survey, my mechanic told me what to use but I don't remember...
     
  5. LmannyR

    LmannyR New Member

    328
    Aug 16, 2008
    West Palm Beach, FL
    220 Sundancer 1989
    5.7 Mercruiser w/Alpha 1
    Absolutely a DIY job. Just be prepared to lift some HEAVY metal up and out of the engine bay. Lay down some protective coverings on the surfaces so you don't scratch up the gel. Good luck and let us know how it goes.
     
  6. jeffk

    jeffk New Member

    273
    Apr 28, 2009
    Sarasota, Florida
    2006 300 Sundancer
    5.0L Mercruiser w/Bravo III
    Definately worth doing yourself if mechanically inclined!!!
     
  7. Nehalennia

    Nehalennia Well-Known Member

    Aug 22, 2007
    Marysville, WA
    2001 310DA twin 350 MAGs, Westerbeke 4.5KW
    Twin 350 MAG V-drives
    Shooting from the hip the cost of parts alone are probably in the $4500-4800 range for 2 engines. An 8 hour day to install will make up the difference.
     
  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
    It's just nuts and bolts - IF the bolts come out. With a newer boat you should have no problems. I encountered 4 severely rusted in bolts and one with a rounded head. Keep in mind these were likely 20 seasons in place.

    You have risers, elbows and manifolds - if you go all OEM parts, the total parts bill should be ~$1800-$2000.
     
    Last edited: Feb 23, 2010
  9. HUMPH

    HUMPH Well-Known Member

    Nov 4, 2009
    SF BAY AREA
    2003 410DA,
    2004 C14 Caribe
    CAT 3126TA's 350HP/
    50HP Honda
    For 2 new engines maybe but not for 2 manifolds is it? :huh:
     
  10. Quint4

    Quint4 Well-Known Member TECHNICAL Contributor

    Oct 6, 2006
    S.W. Ohio
    330 Sport Bridge
    5.7 MPI 350 Merc Bluewaters
    I've done it. Not hard. You need a torque wrench to properly refasten bolts. A trick I've read about is to replace a few of the manifold bolts with "headless" bolts during removal and install. They align the bolt holes and hold the heavy manifold in place as well as the gasket.
     
  11. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    4.3's in a 280 da is a tight fit and will be a pain in the butt. first start with unscrewing your back seat, then unhook your hatch pistons and tie your engine hatch straight up. this will give you more working room. The flatrate on doing both engines from mercruiser is 7.4 hours. If MM miami is more in labor Talk to Bruce LaPorta he is the service manager there. I know him very very well.
     
  12. flflatrate

    flflatrate New Member

    305
    May 21, 2009
    pompano florida
    2003 240 sundeck
    5.o MPI
    quint4 was talking about the headless bolt which is an awsome idea, but it won't work for you since your engines are so close together and the bolts you would need would be to long. that trick works great for the big block engines (7.4) since the bolts holding a 7.4 manifold on are only about 1 1/2 long. Small block and V6 are a few inches long ( around 4-5)
     
  13. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    Thanks..

    Bruce quoted the job,,, just under 1000 for labor,, 4000 parts, 350 tax.

    Yes it is a tight fit and the reason I do not like to work on the boat,, as it takes a small very flexible person to do this with relative ease,,,

    I suppose I can save 1-20% on parts and will probably take me two days of work,, so what is my time worth etc,,,
     
  14. Leafy Isle

    Leafy Isle New Member

    82
    Mar 28, 2008
    Victoria BC
    1982 355T
    Twin 454's
    No matter what brand you replace the manifolds with... use the oem Merc gaskets. I have had lots of problems with the cheaper ones, but never with the merc's. Are your engines fresh water cooled?
     
  15. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    my boat is salt water cooled, so this will be the third set in almost 7 years,, preventative maint,,
     
  16. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    for two engines
     
  17. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    flflatrate:

    Have you ever replaced the Water heater on the 280?
     
  18. Nehalennia

    Nehalennia Well-Known Member

    Aug 22, 2007
    Marysville, WA
    2001 310DA twin 350 MAGs, Westerbeke 4.5KW
    Twin 350 MAG V-drives
    Uh no. I was quoted $2100 for a set of manifolds and risers, gasket kits etc, for my 5.7L. This was for the newer style dry fit ones.

    If you find 2 new engines for <$5k buy them.
     
  19. Panchita

    Panchita New Member

    48
    Jan 24, 2009
    MIAMI
    2005 340 DA
    Blue hull
    Garmin 740s with Radar
    8.1 Merc V-Drives
    clarification , the price is for risers, elbows , labor etc for two engines,,
     
  20. wakeup 19

    wakeup 19 Member

    595
    Nov 14, 2008
    (Medford)Boston Harbor to Cape Ann to Cape Cod and
    1992 300 Sundancer, Quicksilver ding w/ 6hp merc 4 stroke, anchorlift windlass, extended swim platfo
    t/ 350 merc's (carburated) alpha drives gen II


    7B Complete V-6 Exhaust kit (4" Elbow)

    [​IMG]
    Fits mercruiser V-6 models Inc gasketsCast iorn ConstructionREF # 58222

    USES BELLOWS IM512 CLICK TO VIEW
    [SIZE=+1]Order Part Number: [/SIZE]MV64SET[SIZE=+1]
    [/SIZE]Your discounted price: $464.95 plus S&H
    [SIZE=+1](800) 349-2628 ... (504) 888-2798 ... Fax (504) 888-2881[/SIZE] Here are some aftermarket parts, I believe they are GLM or osco. I put them on my new engines 4 years ago with no issues. I can't see Merc parts being that much more? Do I have the correct parts listed for your engine? If you are changing them every 3 years I would not hesitate to use them. Merc gaskets are a good idea. They make a 3 and 4". Any comments? I use these guys all the time for most parts and have never had a problem. But then again I don't take my car to the dealer for the expensive parts either. :huh:
     

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