Logo
Click for Crusader parts and manuals!
Results 1 to 7 of 7
  1. #1

    Default OSCO manifolds / risers

    I have a 1983 229CI (3.8L) Crusader V6, fresh water cooled. A while back I replaced original exhaust manifolds and risers with center rise OSCO (I could not find any risers for the original Crusader manifolds). It is time to replace the risers again (9 years in salt water) and OSCO is out of business. I have a second pair of very serviceable OSCO risers but no gasket material for the manifold /riser joint. When I replaced them 9 years ago, it was simply a gasket (no SS block off plate) and it has worked well all this time. My question is what kind of gasket material should I use since there are no OSCO gasket available in the market?Thanks, Mike

  2. #2
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,595

    Default Re: OSCO manifolds / risers

    I'm thinking that you are looking for exhaust "elbows" not risers/spacers..... yes/no?

    (in a misnomer fashion, the industry has been referring to these as "risers" for some time now)




    A spacer/riser is actually the part that fits between the exhaust manifold and elbow as to gain elbow elevation, and/or provide coolant porting that an elbow may not offer.


    Here is a link to Boatman's I-Net Marine.
    If this is not the correct elbow, search their inventory.


    https://inetmarine.com/osccscr618manifold38lv6.aspx



    Once there, click on the elbow, and you will see their OSCCRR-2-G-FW block-off gasket


    .
    Last edited by RicardoMarine; 01-16-2020 at 07:48 AM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  3. #3

    Default Re: OSCO manifolds / risers

    Yes, elbows, not risers. Thanks for the link and I have requested about inventory. So far the problem has been that places that list them on their sites have no inventory so I may have to make my own. That’s why I was asking what kind of gasket material stock I should cut them from.

    Thanks, Mike

  4. #4
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,595

    Default Re: OSCO manifolds / risers

    You will not want the transfer ports to breach a good seal.
    If you were to make your own gaskets, and if unsure of the material type, I would put some effort into finding the SS plates, or make them if not available.
    The four holes can be drilled.
    The center exhaust chamber port may require the use of a plasma cutter.

    .
    Last edited by RicardoMarine; 01-16-2020 at 09:03 AM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  5. #5
    Join Date
    Apr 2013
    Location
    Lower Columbia River
    Posts
    148

    Default Re: OSCO manifolds / risers

    I have some extra gaskets that came with the Barr exhaust components I bought a couple years ago. The gaskets are made from Interface Solutions N-8094 material - if you Google the bold text you can get the specs.

  6. #6
    Join Date
    Oct 2009
    Location
    New Haven, CT, USA
    Posts
    650

    Default Re: OSCO manifolds / risers

    So will Barr be the only game in town? Who makes the Crusader branded versions? I just did four of those on my 8.1ís and only found out accidentally that Osco was no more.

    Bob

  7. #7
    Join Date
    Mar 2009
    Location
    Dresden, Maine, United States
    Posts
    362

    Default Re: OSCO manifolds / risers

    Michael, Where in Maine are you located? I have found Portland Yacht services to be very helpfull on things like this. Their head tech Ray is a wealth of information.

Similar Threads

  1. Osco Risers and Elbows
    By Wolfpack Rugby in forum Crusader Marine Engine Forum
    Replies: 7
    Last Post: 03-03-2016, 06:43 AM
  2. Replies: 3
    Last Post: 08-22-2012, 01:14 AM
  3. New OSCO "Dry Fit" Manifolds and risers
    By William Miller in forum Mercruiser Sterndrive Forum
    Replies: 2
    Last Post: 08-07-2012, 10:48 AM
  4. Osco manifolds and risers
    By donald_r in forum Chrysler Inboard and Sterndrive Forum
    Replies: 10
    Last Post: 09-04-2009, 01:10 PM
  5. Osco exhaust risers
    By captainmuskrat in forum Archive 2002-2006
    Replies: 1
    Last Post: 03-06-2006, 02:48 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •