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Exhaust Backfiring Question

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  • Exhaust Backfiring Question

    I bought a Johnson 175hp maybe early to mid 90's. It won't start, 90psi all cylinders. Sprayed starter fluid in the carbs after cleaning. It wouldn't start, just loud backfire from the prop. I turned the flywheel by hand and when the 1 and 2 piston was all the way up the flywheel tdc was significantly past the pointer (about 2-3 inches past) so could I have a sheared key

  • #2
    That would be the first thing to check.--And what does it show with only # 1 at TDC ??-----------Model # is ??

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    • #3
      didn't check the model number but the flywheel has markings for #1 and #2...Both were same same 2-3 inches past the marks when pistons came all the way up feeling with a philips screwdriver

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      • #4
        Check the flywheel key.

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        • #5
          The fly key was gone so today I installed a new correct key, down torqued 110psi, checked tdc again, all was lined up. Sprayed a little starter fluid and she's still loud backfiring from the prop area. The plug wires and coil wires are next to each plug so am I still missing something. model # 175tl79r

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          • #6
            bump

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            • #7
              Sign up today
              Answered in detail another forum..... wrong torque! Must be torqued (V6) to 145 foot pounds.
              Our Questions Require Answers... If You Refuse To Answer Our Questions... How Can We Answer Yours?

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