1. Please join your fellow forum members on our new Facebook Group. https://www.facebook.com/groups/247355990036949

Should I be concerned?

Discussion in 'Mechanic Recommendation Forum' started by Essayons, Oct 4, 2020.

  1. Essayons

    Essayons New Member

    Sep 30, 2020
    1990 220 CC
    MerCruiser 5.7
    Happy engine, happy boater:)

    I also changed the oil/filter, spark plugs, and spark plug wires. Easy without the manifolds in.

    for anyone wanting to attempt this, it’s straight forward if you have any mechanical aptitude. I would also recommend using a torque wrench to tightening the bolts, rather than feel. I torqued them to 25 ft-lbs, let the engine warm up and retorqued. I think if you overtorque the manifold bolts, you make risk leakage. That’s my opinion based on the bolt pattern used. The middle two ports will have no issue, but the end ports only have one bolt at each port. Over-torquing MAY cause uneven pressure on the gasket.

    great advice on keeping a log.
    OllieC and Greg Lions like this.
  2. Essayons

    Essayons New Member

    Sep 30, 2020
    1990 220 CC
    MerCruiser 5.7
    Just tieing off all the loose ends. These are pics of the manifold and risers I replaced. I’m not sure, but I think I could have gotten another 5-10 years out of the old ones ;)
  3. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    By the looks of those pictures, it’s a miracle that you avoided serious engine issues.
    Chris-380 likes this.
  4. Thornton69

    Thornton69 Active Member

    Sep 15, 2014
    Northern BC
    1981 245 SDC
    2020 Solar 420
    '97 5.7 Bravo 2
    '20 Merc 25 EFI Jet
    It looks like there are a couple large piece of the risers missing? If you didn't find them, they are likely sitting at the bottom of the Y pipe or in the transom/bellhousing assembly. If that is the case, it is possible you will have heating/performance issues at higher rpm's.
    scoflaw likes this.

Share This Page

Show Sidebar