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  1. #1

    Default 1987 5.7L 350XL Fuel Injected

    Have twin 1997 Crusader 5.7L 350XL fuel injected engines with 708 hours on them, port engine runs fine with no issues but the starboard engine will not run as it has bad compression on cylinders 3 and 5 nor will these two cylinders hold compression. Both engines power twin V-drives, engines are set in boat with flywheel/output facing forward to the bow. The boat is a 1997 Cruisers 3075 Rogue Yacht, looking for advice as to what I should do with the starboard engine, what rotation would it be and if 708 hours is excessive enough to go ahead and pull both engines for rebuild before this years boating season starts.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
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    7,418

    Default Re: 1987 5.7L 350XL Fuel Injected

    Welcome to ME.com!!

    A leakdown test will give you insight to the cause of the compression leak. Being adjacent cylinders have issues, could be head gasket....

    As far as rotation, the Serial Number Plate is your best source of those details....as long as the engines are original.

    700 hours should be ~ 35% of the life of the bottom end, assuming decent maintenance has been done.....the top end typically sees 1000 hours before needing to be reworked.

  3. #3
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    5,104

    Default Re: 1987 5.7L 350XL Fuel Injected

    If Raw water cooled the engine blocks are at the end of their life span for time, not running hours....If they are FWC, Like MakoMark says, do a leakdown test.

    I would do a Leakdown on both engines, then you will know their true health.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  4. #4
    Join Date
    Nov 2012
    Location
    South of Boston
    Posts
    86

    Default Re: 1987 5.7L 350XL Fuel Injected

    As far as rotation I thought that by 1997 GM had done away with reverse rotation.

  5. #5
    Join Date
    Sep 2008
    Location
    Maryland - USA
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    Default Re: 1987 5.7L 350XL Fuel Injected

    I think the introduction of Gen VI was the end of GM's standard production reverse rotation offeings....that said, there's always some inventory that needs to be consumed before the 'new' products actually make it to the end user....so, I wouldn't be surprised to see a few RH Gen V bigblocks in the 1998 serial number span.....

  6. #6

    Default Re: 1987 5.7L 350XL Fuel Injected

    Leak down test shows leakage in top and bottom of Stbd engine, pulling it for a complete rebuild shortly. Also checked Port engine with same amount of hours and the results were questionalble as to re-build or not. Now pulling both engines to keep them both at same intervals is best decision, both engines pulled and rebuilt in 10 days doesnt seem too long.

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