Welcome Guest - Sign Up today
Welcome Guest - Sign Up today

Announcement

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.

Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

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 454 blown headgasket or cracked block?

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Mercruiser 454 blown headgasket or cracked block?

    I just purchased a 1995 Rinker with a 454 mercruiser. Original owner said engine worked fine but when he went to start it at home after sitting for 3 months it would not work and he noticed water in the oil and assumed it has a cracked block. The thing is the block was just replaced 2 years ago and has less than 20 hours on it. Also he said he has started it several times with no problems since the last time it was in the water. What is the easiest way to check for a cracked block or a blown head gasket?

  • #2
    Re: Mercruiser 454 blown headgasket or cracked block?

    depends on where the crack is or the break in the gaasket. if the plugs are not wet with water it usually will rule out a cyl area. after that its a matter of tear down and inspect. however I would dissconnect the manifolds from the seawater and pressure test the block/heads assy before removing anything. why was the block replaced last time? is this fresh water(closed) cooled or raw water cooled?
    no tech questions by PM, they wont get answered.
    you have to be trusted by the people that you lie to .

    Comment


    • #3
      Sign up today
      Re: Mercruiser 454 blown headgasket or cracked block?

      As with all marine engines, check the exhaust manifolds first! That way, if that's your problem, you may not have to check for a cracked block or blown head gasket.

      Comment

      Working...
      X