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crank no start after head gasket. 2008 3.O Mercruiser.

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  • crank no start after head gasket. 2008 3.O Mercruiser.

    I pulled motor to install head gasket. I'm at stopping point as I have crank no start.
    152 PSI on all cylinders
    Tested with light tester:
    I voltage to purple wire at coil. Voltage to grey wire from coil
    Both wires from Coil to distributor have voltage.

    I have Chiltons book for Mercruiser up to 2001. It describes testing coil by probing each contact for open and shorts.
    I have extra coil from buddies 3.0 installed. Both coils tested the same value.

    I don't have spark on main wire from coil to distributor. I was using a Timing light to verify spark.

    Does any one have an updated wire diagram for 2008 3.0?
    I have a circuit breaker, No extra start solenoid.
    Compression test 152 psi each cylinder .

    Prior history:
    I did remove the TKS in for 2002 common standard choke style Carb.
    I rand 12v switched to the carb.
    I ran this way for 2018 season.

    Head gasket change as I was having water in oil New gasket with head checked.
    I could not find signs of cracked blocked. ( I sealed cooling system added 5psi and pressured the system for 15 min. No air leak)

  • #2
    There should be 12V on purple wire with key ON, and it sounds like there is.

    Remove the gray Tachometer wire from the negative side of the coil until the motor is running again

    Get a spark tester and install between coil wire and distributor. Crank the motor over and see if your getting spark

    Check to see if your getting fuel in the throat of carb when throttle is pumped
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

    Comment


    • #3
      Take your plugs out, all but #1 cylinder. Hook up your timing light to number 1 and crank er . See if your timing is where it belongs. Then check wire order again. Easy to get them out of order.
      17 Foot '90 Bluewater
      Alpha 1 3.0 Merc - repowered in 2016
      now - 4.3L Vortec - Alpha 1 GenII
      Honda BF100L kicker
      Engine custom - Transom 0D65328 - Drive 0D648864
      If you ain't fishin, then yer working too much.

      Comment


      • #4
        Originally posted by Rick Stephens View Post
        Take your plugs out, all but #1 cylinder. Hook up your timing light to number 1 and crank er . See if your timing is where it belongs. Then check wire order again. Easy to get them out of order.
        And the timing light will fire how? (He has no spark!)

        Chris.......
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        The world takes on a whole new perspective when viewed from 100’ below.
        1972 Bertram ‘Bahia Mar’ 20
        2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
        (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


        Comment


        • #5
          I burnt through a couple coils after installing a pertronix electronic ignition in a real short time frame because I didn’t have it wired right...not saying that’s what’s going on here but no spark from the main wire from the coil to the distributor sounds familiar to me. I’d put a new coil on there and test for spark. I know they say don’t throw parts at a problem but coils aren’t too expensive and if it’s not the problem you will have a backup.

          Comment


          • #6
            Originally posted by jeepxjmike View Post
            Tested with light tester:
            I voltage to purple wire at coil. Voltage to grey wire from coil
            Both wires from Coil to distributor have voltage.
            you have a wiring issue

            the grey wire is the tach, not needed to start the motor - so disconnect it. if you have voltage at the grey wire, you have an issue. the black wire from the dizzy simply pulses ground to the negative side of the coil. to verify the coil, etc. simply have battery voltage to the coil + and take a wire from ground to the coil - and pulse it. you should have spark

            Originally posted by jeepxjmike View Post
            I have Chiltons book for Mercruiser up to 2001. It describes testing coil by probing each contact for open and shorts.
            I have extra coil from buddies 3.0 installed. Both coils tested the same value.
            I suggest you throw away the knee pad and get the factory manual.

            there is also a TB ignition troubleshooting guide in the stickies.
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

            Comment


            • #7
              Originally posted by achris View Post

              And the timing light will fire how? (He has no spark!)

              Chris.......
              Missed that little gem...
              17 Foot '90 Bluewater
              Alpha 1 3.0 Merc - repowered in 2016
              now - 4.3L Vortec - Alpha 1 GenII
              Honda BF100L kicker
              Engine custom - Transom 0D65328 - Drive 0D648864
              If you ain't fishin, then yer working too much.

              Comment


              • #8
                Originally posted by Scott Danforth View Post
                ...
                there is also a TB ignition troubleshooting guide in the stickies.
                It's not Thunderbolt, it's a 3 litre with EST....

                Chris...
                xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                The world takes on a whole new perspective when viewed from 100’ below.
                1972 Bertram ‘Bahia Mar’ 20
                2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                Comment


                • #9
                  I have the manual i seloc 92 00 not as up to date as I need. but helps with basic things

                  where in the stickes might i find the wire diagram for 2008?
                  With the light tester i have voltage on the grey wire.

                  Comment


                  • #10
                    Did you remove the TKS carb before the head gasket replacement?
                    If so, was the motor running OK after the TKS carb was replaced?

                    What caused the head gasket replacement?

                    Test lights are OK, but you need a voltmeter
                    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                    07 Seadoo GTX
                    Merc Adults Only VP Adults Only
                    G-Dad always said "First Liar doesn't stand a chance"

                    Comment


                    • #11
                      The boat did run after tks carb removal. Buddy gave me a parts motor.
                      Water in oil for head gasket. Not sure if it ever ran well. This thing as been a pain since a bought it. Bought it off 74 year old lady who never really used. it. Come to find water in oil.
                      Not sure if it ever ran well. 3.0 always struggles. It really a dog. I have had small outboards with more ***.

                      Comment


                      • #12
                        Originally posted by StinkinRenken85 View Post
                        I burnt through a couple coils after installing a pertronix electronic ignition in a real short time frame because I didn’t have it wired right...not saying that’s what’s going on here but no spark from the main wire from the coil to the distributor sounds familiar to me. I’d put a new coil on there and test for spark. I know they say don’t throw parts at a problem but coils aren’t too expensive and if it’s not the problem you will have a backup.
                        It has to be type wiring issue. It might be bad second coil. (Maybe, but they measured about the same resistance. )
                        Maybe bad ground to coil? I cant see it as it's bolt to block. I might try a jumper from battery ground to base of coil.

                        Comment


                        • #13
                          Since it ran before head gasket replacement I'm assuming its not motor related

                          Here is wiring for EST ignition
                          Check for 12V (not test light) on purple wire.
                          Then check for spark as mentioned above, or at coil to a ground

                          Click image for larger version

Name:	3.0 wiring.jpg
Views:	1
Size:	76.9 KB
ID:	10700784
                          94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                          95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                          07 Seadoo GTX
                          Merc Adults Only VP Adults Only
                          G-Dad always said "First Liar doesn't stand a chance"

                          Comment


                          • #14
                            Originally posted by AllDodge View Post
                            Since it ran before head gasket replacement I'm assuming its not motor related

                            Here is wiring for EST ignition
                            Check for 12V (not test light) on purple wire.
                            Then check for spark as mentioned above, or at coil to a ground

                            [ATTACH=JSON]{"data-align":"none","data-size":"full","data-attachmentid":10700784**[/ATTACH]
                            I have. 12.39 volts on purple wire on coil. 12.39 volts on red and brown wires going to distributor. White black wire to distributor 12.39 volts .

                            My style wire harness has a Relay instead of solenoid
                            The relay has yellow / red , Red, black and yellow / brown.
                            Last edited by jeepxjmike; January 29th, 2019, 06:45 PM.

                            Comment


                            • #15
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                              Other then Purple, I'm not finding those colors on the distributor

                              Is the rotor turning and the cap clean?

                              What is this

                              Click image for larger version

Name:	dist.jpg
Views:	1
Size:	64.6 KB
ID:	10700862
                              94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                              95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                              07 Seadoo GTX
                              Merc Adults Only VP Adults Only
                              G-Dad always said "First Liar doesn't stand a chance"

                              Comment

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