Slow leak at the exhaust riser fitting

Discussion in 'General Maintenance/Repair Questions' started by Joel_CA, Jun 18, 2020.

  1. Joel_CA

    Joel_CA Member

    109
    Sep 15, 2013
    Norcal
    1998 Bowrider 210
    5.0 Mercuriser/ Alpha 1
    So I finally took my boat out of the garage to prep it for it's first dip of the season. After a couple of cranks, she fired right up and purred like a kitten. During my routine visual inspection, notice a small leak at the exhaust riser drain fitting. Just curious as to what the repair would be. Is this fitting threaded into the riser? If so, is removing the fitting and adding Teflon tape a viable repair? I'll eventually figure it out in the morning but just thought I'd get a head start with some info. Any advice would be greatly appreciated. 4K video included.




    Joel
     
    Last edited: Jun 18, 2020
  2. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Sure or thread sealant
     
  3. Joel_CA

    Joel_CA Member

    109
    Sep 15, 2013
    Norcal
    1998 Bowrider 210
    5.0 Mercuriser/ Alpha 1
    So I had planned on removing the drain elbow to reseal it with Teflon tape to find that it is made of plastic. I tried backing it out and it wouldn't give - so rather than risking breaking it and grounding the boat till i find a replacement part- I thought I'd order the replacement part ahead of time. Can anyone tell me if this part is the same for all V8's? I need to make sure the coolant hose will fit it.

    Joel
     
  4. 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
    If the fitting is plastic Teflon tape is probably not going to work well. On anti siphon fittings that are plastic going into brass fitting I used a lead based plumber sealant. Plastic has a different coefficient of expansion than steel so a seal at one temperature may open up and drip at another temperature. I am not a mechanic, perhaps others more qualified can comment why you can not use a metal fitting.
     
  5. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Merc uses metal elbows, order OEM
     
  6. Joel_CA

    Joel_CA Member

    109
    Sep 15, 2013
    Norcal
    1998 Bowrider 210
    5.0 Mercuriser/ Alpha 1
    Yep- ordered the OEM elbow and it was metal. Thanks!

    J
     

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