• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Mercruiser Riser elbow gasket question

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Mercruiser Riser elbow gasket question

    I am replacing the manifolds and risers/elbows on my 1984 Mercruiser 228 and can't figure out which gaskets to use between the manifolds and riser.

    They sell 3 different. (4 hole, 2 hole and no holes/blocked)

    Mine is full raw water cooled so i assumed I need the one with 4 open slots. The one with 2 open slots seems to be the most common.

    Please help

    Thanks


  • #2
    Re: Mercruiser Riser elbow gasket question

    Have a look at this Merc Service bulletin, it explains which gaskets to use.
    Don S.

    sigpic

    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

    Comment



    • #3
      Re: Mercruiser Riser elbow gasket question

      Originally posted by othelloears View Post
      I am replacing the manifolds and risers/elbows on my 1984 Mercruiser 228 and can't figure out which gaskets to use between the manifolds and riser.

      They sell 3 different. (4 hole, 2 hole and no holes/blocked)

      Mine is full raw water cooled so i assumed I need the one with 4 open slots. The one with 2 open slots seems to be the most common.

      Please help

      Thanks
      The correct ones for my 7.4 w/ raw water cooling are the 2 slot ones w/ 2 small holes. Slots go on side to side with the 2 little holes facing fore and aft.

      The 4 slot ones are used when riser blocks are used between manifold and riser elbow. They are to go between the riser block and riser elbow, with the 2 slot ones between the riser block and manifold.

      The no holes ones are used when you have fresh water cooling (and should be used with the S/S block off plates for strength) and go between the risers and manifolds to isolate the raw water from the engine coolant.
      '92 Chaparral 2550 SX Sport
      454 BBC Mercruiser Bravo 1
      Tow with '04 F150 Larriat SuperCab 4x4 5.4 Triton
      US Coast Guard Aux.

      Comment



      • #4
        Re: Mercruiser Riser elbow gasket question

        You guys are great thanks

        I have to lok at the boat but in think I need the restrictor 2 slot because I have the connection frm the riser to the termostat.

        Do the slots go fore and aft or the big slots?

        Comment



        • #5
          Re: Mercruiser Riser elbow gasket question

          Originally posted by othelloears View Post
          You guys are great thanks

          I have to lok at the boat but in think I need the restrictor 2 slot because I have the connection frm the riser to the termostat.

          Do the slots go fore and aft or the big slots?
          The correct ones for my 7.4 w/ raw water cooling are the 2 slot ones w/ 2 small holes. Slots go on side to side with the 2 little holes facing fore and aft.

          '92 Chaparral 2550 SX Sport
          454 BBC Mercruiser Bravo 1
          Tow with '04 F150 Larriat SuperCab 4x4 5.4 Triton
          US Coast Guard Aux.

          Comment

          Working...
          X