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    1980 OMC 3.0L won’t accelerate

    I had the head resurfaced before I assembled it. Had maybe 2 hours of run time before it blew. My brother is a machinist so I’ll have him give it a looksy.
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    1980 OMC 3.0L won’t accelerate

    Found the problem
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    1980 OMC 3.0L won’t accelerate

    That’s the one thing I haven’t been able to check. I’m currently off sick from work and unfortunately my compression tester is in my tool box there. I’ll ask a couple friends if the have one I can borrow.
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    1980 OMC 3.0L won’t accelerate

    Ok, this issue is driving me crazy. I have a 1980 3.0 stringer. Over the winter I replaced the impeller and a gear with a couple teeth missing. I removed and cleaned the manifold, removed the cylinder head for inspection and had a cracked valve replaced and rebuilt the carburetor (Rochester 2...
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    1980 3.0L strange overheat issue

    Had an interesting thing happen on Friday. Had the boat running in the driveway for about an hour and it ran great. We hooked the boat up to the truck and started loading up for the weekend. My daughter came out to the garage and asked why there was smoke coming out of the back of the boat. Went...
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    1980 3.0L strange overheat issue

    Camshaft checked out ok. What I ended up doing was to crank the engine over until oil came out of the push rods up top. Then adjusted the valves as per the manual (not running). I tried it and it started up right away. I noticed a little slop in the distributor shaft so I filed the points and...
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    1980 3.0L strange overheat issue

    I had the head off in the spring to replace a cracked valve. From what I’ve been reading online, everything is pointing towards a worn camshaft. I’m bringing the boat home this weekend and will put the dial indicator on it to check.
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    1980 3.0L strange overheat issue

    I tried adjusting the valves yesterday, didn’t work out. I had it running up to temp and it would barely idle. Dwell at 32° timing at 6°. When I backed off the adjuster nut until the rocker clattered (#4cyl) the idle picked up and was smooth as silk. I slowly tightened it down 1 turn and it...
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    1980 3.0L strange overheat issue

    One thing I need to ask those in the know. Is that annoying low oil pressure buzzer somehow interlocked to cut out the ignition if low oil pressure is detected? I’m asking because some of the diesel GPU’s we have at work have a time delay on the oil pressure. It’ll run for a few seconds then...
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    1980 3.0L strange overheat issue

    I’ll be at it again this weekend and figured I best leave the fuel line disconnected and crank the engine to pump out a cup of fuel into a clear container and check for water. I ordered a water separator kit and will also get that installed this weekend. I also have a new filter to replace the...
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    1980 3.0L strange overheat issue

    I disassembled the carb and it wasn’t pretty. The first photo is the fuel inlet filter, the second is the fuel inlet and finally the fuel I sucked out with a large syringe. The murky stuff at the bottom is dirt and water I ran the carburetor through 2 short cycles in the ultrasonic cleaner...
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    1980 3.0L strange overheat issue

    I already have the carb kit (Napa) the ultrasonic cleaner I’m using at work will be the one used for turbine fuel system components. I’ll run it through a short cycle then inspect it. It would be nice if the problem was something simple like a low float level but if that was the case, the higher...
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    1980 3.0L strange overheat issue

    So far I really haven’t had a lot of time to work on it. I’m leaning toward fuel delivery as I’m not sure how old the fuel filter on the pump is. I picked up a new filter which I’m hoping to replace today. I also picked up a rebuild kit and if the filter and adjustments don’t help, I’ll take the...
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    1980 3.0L strange overheat issue

    I found an NOS gear on eBay and it’s all back together. The machine shop only charged $100 to replace the valve and resurface the head. I took it out on the lake and no overheating!! The new problem is run ability. It fires up quickly then pretty much immediately dies. It takes several attempts...
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    1980 3.0L strange overheat issue

    I decided while waiting for the cylinder head to check the impeller. It is actually intact and not hardened. Unfortunately, the gear on the shaft behind the impeller has a couple broken teeth and the gear it drives needs new bearings as they are hard/rough to turn. The price of these gears (even...
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    1980 3.0L strange overheat issue

    I dropped the head off at the machine shop. They’ll check the valves, replace the cracked valve and resurface the head.
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    1980 3.0L strange overheat issue

    Ok. I have the riser and coupling hose off. I’ll look inside and see if it is there. I went through my manual a couple times and there was no mention of it. I looked for the part online and only found one listed for a Cobra not a stringer. I’ll verify visually. I check inside the exhaust...
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    1980 3.0L strange overheat issue

    Where are they located? Would it be where the exhaust adapter meets up with the outdrive?
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    1980 3.0L strange overheat issue

    Ran into another problem. I pulled the cylinder head to clean out the cooling passages as well as check the block passages. I did find the small passages on the head where cooling water comes from the block were partially to fully blocked. They have been cleared and flushed out. The small...
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    1980 3.0L strange overheat issue

    I’ve found a few places that have the 3.0L replacement which is what I have. I’m am however going to run it with this manifold for now to make sure this is actually the problem. I’m still going to pull the head and water pump and check all the cooling passages to be sure they are fine. This...
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