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    Help understanding vacuum test

    I have a timing light with advance. When I use it for idle timing I see the notch at the 8 deg. BTDC, so if I use it for advance where does the notch line up?
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    Help understanding vacuum test

    So basically I'm just eyeballing the notch since the marker on the engine only goes up to ten I think
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    Help understanding vacuum test

    I have a points ignition, it has advance weights
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    Help understanding vacuum test

    160 is high its supposed to be what like 140? Is that bad or is the gauge wrong? It's an inexpensive one off Amazon
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    Which carb kit please?

    Call National Carburetor and give them those numbers off your carb and they will fix you up. $300 shipped
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    Help understanding vacuum test

    I don't fully understand how to check total advance. I believe I need to be at a high enough RPM for the advance weights to be active and use a timing light to check. So that would require someone else driving the boat pretty fast while I check. Does that sound right?
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    Help understanding vacuum test

    I did one with the engine cold and had ~160 psi on all four cylinders
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    Help understanding vacuum test

    Engine is a 1990 3.0L, serial number 0D389001. In the water, in gear at idle of around 680 RPM I get around 15 hg. The needle bounces around a little bit. I have gone back and forth between idle speed and mixture screw and this is as good as I can get it. The needle is over a section on...
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    Which service manual do I need?

    I have two service manuals.. Number 13, and Number 26. I'm pretty sure 26 is the one I should be referencing but I'm not sure. How can I tell? They're both very similar in content. My engine serial number is 0D389001
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    Temp heat switch wire is connected to my temp sender?

    It's 0D389001 - I am pretty sure I do not have a temp switch.
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    Temp heat switch wire is connected to my temp sender?

    Engine is Merc 3.0L. Looking over the service manual, it shows that I should have the tan wire running from my sender to the gauge. and the tan/blue wire running from an optional audio warning water temp heat switch. Instead, my engine has both the tan and the tan/blue wires running from the...
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    Thermostat Gasket Sealer

    @Bondo Can you explain what you mean? Does this apply to other engines? I have a 3.0L.
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    Where to attach vacuum gauge to 3.0L?

    Thanks, I found the location - I can do the test, but now I don't really know how to interpret the results, or if this is what you had in mind when you suggested a vacuum test to find out if valve adjustment is needed. Thanks again.
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    Where to attach vacuum gauge to 3.0L?

    What do you mean? I believe it was Rick that suggested I hook up a vacuum gauge to see if I need to adjust valves. Having a really hard time finding any good information on how to do this.
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    Where to attach vacuum gauge to 3.0L?

    Engine serial number 0D389001. Basic newbie question. Where do I hook up the gauge?
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    Troubleshooting engine temp

    It was rusty and dirty. I put it in clr and cleaned it up and tested it in boiling water
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    Troubleshooting engine temp

    Thanks, not sure what that is. I'll see what I can find.
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    Minor shudders at idle

    Thanks, I have the manual and I read over the section on valve adjustments (engine off) but I have never done a valve adjustment, let alone taken the valve cover off of any engine. Is this something a novice can do with the right tools or am likely to get myself into trouble? Does the valve...
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    Troubleshooting engine temp

    It does now. I think it was stuck open before.
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    Troubleshooting engine temp

    I put it in some CLR and brushed it clean with an old toothbrush and put it in a pot of boiling water. It opened up like this
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