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  1. R

    ignition help again!

    you guys have helped me many times before so I thought I might try again! I have a mercruiser 4.3 thunderbolt with no spark at the coil. I have changed the coil, plugs, cap, rotor etc. I think the only thing I haven't changed is the HT leads which I will do next, But I am getting no spark when I...
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    will any carb do

    I have to replace my carb on my 4.3l V6. As far as I can tell the one on at the moment is a 2bbl mercruiser. It only has 1 air screw for idle adustmet, it also has a bi-metal choke that I think expands when a current is passed through it. Am I right that it's a mercruiser 2bbl and will any carb...
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    fire from carb merc 2bbl 1992 4.3 V6

    Hi, some of you will have read my previous posts regarding my carb, in a previous post I told of hoe whilst cleaning the carb I managed to burn of the threads for the power valve and metering jets, I have glued these in now and rebuilt the carb. I was having problems before with idle turn over...
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    no spark 4.3l v6 1991, any ideas

    Hi, i have just changed my plugs, cap, rotor, and the bit inside the cap with the red and green stripy wires. I was getting a spark 2 days ago when I grounded a plug and turned the engine over (thunderbolt ignition). Then the ignition fuse blew (15 amp), traced the fault to the bi metal choke on...
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    is it possible to bench test an ignition sensor or module

    I have a thunderbolt ignition (merc 4.3 v6) with the later design module 5 pin connector module. I have tested the resistence on my coil on both circuits and am getting 1.2 and 10200 ohms so I know the coil is fine. I have no spark from the top of the coil if I ground a plug and turn the...
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    bent push rod problem

    if I have bent a push rod following water in the cylinder, does anyone know what the signs would be to show it is bent. Also can running the engine do further damage if it is bent?
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    could i have done any other damage

    Hi, whilst changing my mercruiser 4.3 v6 exhaust risers I didn't know about draining the water down first, anyway, the risers were pretty bad so I think the last time I started the boat with mufflers (about 6 weeks ago) I may have got some water in the cylinders. At that time I ran it for...
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    can anyone explain how a choke works

    -------------------------------------------------------------------------------- I am starting to understand how a choke on a mercarb works, as I see it when cold the spring bit holds the butterfly flap on the top of the carb closed under tension, as it warms up from the 12v going through it...
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    choke testing

    I am starting to understand how a choke on a mercarb works, as I see it when cold the spring bit holds the butterfly flap on the top of the carb closed under tension, as it warms up from the 12v going through it the butterfly flap is allowed to open, is this right and can I check it by...
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    alpha 1 trim solenoid problem

    Hi, its probably been covered but I need a bit if quick advice. My trim does not move, it clicks when I press down, nothing when i press up. I have two solenoids on the presolite pump, I have tested both and get the same results from both. I have 12v live on one of the fatter terminals when I...
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    rusted clevis pin

    has anyone got any tips how to free a rusted clevis pin at the end of my steering cable, its difficult to get to at the back of the engine, I have tried heating it up with a tourch but can't budge it. I think I will end up drilling it but if anyone has a better idea, it would be great
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    can my crank shaft be seized?

    I have a merc 4.3l v6. Unfortunately it got washed ashore and filled with sea water last year. We lifted it out straight away and got everything running as normal before fogging the engine and spraying a couple of cans of wd40 everywhere. I went to use it this year and the starter was clicking...
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