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rod knock or exhaust leak how to tell

Discussion in 'The Powder Keg' started by sawnoffshotgun, Mar 2, 2010.

  1. sawnoffshotgun

    sawnoffshotgun Suspended

    I am looking at a truck that definently has a bad exhaust but im ok with that since itys just a mudder anyways. Im assuming its gonna have some kind of exhaust leak which sounds a lot like a bad engine bearing but I want to make sure that it is just a bad exhaust and not a bad engine. Does anybody know a good way to tell an exhaust leak apart from a bad bearing?

  2. DWFan

    DWFan G&G Evangelist

    Put the tip of a long screwdriver against the engine block and the handle to your ear while the motor is running. A bearing knock will be amplified, an exhaust leak won't.
  3. Mooseman684

    Mooseman684 G&G Newbie

    You can also use insulated Pliers and Pull each plug wire as it is running...Listen to the Knock...If it changes on One Cylinder or disappears , That is a Bad Bearing...A rod Knock will sound more like Metal hammering than an exhaust leak will and will usually be louder...The Stethoscope is also good to use...
  4. FortyXDM

    FortyXDM Super Moderator Staff Member

    Don't wear a hat or get your hair caught in the fan blade ! :D:D
  5. sawnoffshotgun

    sawnoffshotgun Suspended

    Thanks for the help guys.
  6. killsnapz

    killsnapz G&G Enthusiast

    A bad connecting rod will sound exactly like what it is decribed as a knocking sound. A cracked exaust manifold will sound more like a collapsed lifter and will make a loud ticking sound. If you have any type of rapping noise that you can hear better with a long screwdriver pressed agianst the block then you probally should assume you are going to be spending alot of money on the engine.

  7. samuel

    samuel G&G Newbie

    If it is dangerous,get your wife to check it out.If she gets her hair caught it may save money at the beauty shop. ,,,sam.
  8. 338RUM

    338RUM G&G Evangelist

    when listening to the block of an engine I prefer a wooden broom handle for pre stated reasons... an exhaust leak would be a tick sound (if leaking around the manifolds) and a bent push rod or bearing would leave a much louder knock...
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