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    2018 Mercury 40 EFI – rhythmic RPM surging at WOT after 5 minutes – video

    Yeah, cleaning the VST might be worth a try. Since it runs fine for a few minutes before the RPMs start jumping around, maybe check the VST filter and fuel pressure while it's running at full throttle
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    2018 Mercury 40 EFI – rhythmic RPM surging at WOT after 5 minutes – video

    Interesting issue. Since you've already tried a different fuel tank and primer bulb and bypassed the fuel/water separator, it may be worth looking beyond the basic fuel supply setup. Have you had the engine scanned for stored or pending fault codes? Even without a warning horn, checking the ECU...
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    No pre-start oil pressure

    With the 210 hp Cummins 6BT 5.9, I wouldn't assume it needs to show 30 psi before starting. When the engine is stopped, the oil pressure gauge will normally read zero because the oil pump isn't turning. What matters is how quickly the pressure builds after starting and whether it meets Cummins'...
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    Detroit Diesel 12v71N Marine Engin

    The exact maximum exhaust gas temperature for a naturally aspirated Detroit Diesel 12V-71 can depend on the engine’s rating and where the temperature is measured. I couldn’t verify a single maximum temperature that applies to every 12V-71 marine setup, so I’d check the original Detroit Diesel...
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    Volvo penta DPS B outdrive exhaust noisey

    You’re not wrong! I thought the same thing, as the exhaust is supposed to exit through the prop hub to help keep the noise down. But some exhaust can also come out around the cavitation plate, especially at idle or low RPM. If you’re seeing most of it coming out there even while cruising, I’d...
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    Volvo Penta AQ115A/100B Advice Needed

    Have you checked whether a complete used 100B setup might be easier to source than trying to adapt a newer outdrive? The AQ115A was commonly paired with the 100B, so finding a complete used replacement may be more straightforward than converting to a later drive. I’d also check the condition of...
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    volvo penta 5.7 gsi hard start when warm

    I’m having a similar issue with a Volvo Penta and was wondering if you ever found the cause of the problem. The symptoms you described, especially the rough idle and stalling when warm but normal operation under load, sound very similar to what I’m experiencing. Did you eventually identify...
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