Our 2GM20F had similar issues with rpm twice.
First time was when we bought the boat. Simple bottom clean and all was good.
Then, due to C19, we hadn't been out for 5 months and 2300 was our max
while heading to the lift. After the crud and barnacles were removed from
the prop and the bottom, 3600rpm (after fully warmed up) was easy.
This time we installed a SS elbow and the engine now starts better than
ever with nothing more than a slight puff of white exhaust. I suggest dirty
prop. Good luck.
On September 12, 2020 7:44:47 p.m. Dave S <syerd...@gmail.com> wrote:
Non C&C content but relevant. My neighbour has an Ericsson 30 with a 16hp
universal diesel.
His engine will not rev beyond 1800 In reverse and is similarly challenged
in forward. It’s dangerous as he cannot proceed faster than 2kt against
wind and waves. It revs freely beyond 3000rpm in neutral.
Am thinking it’s either low fuel flow (so work from pickup tube to pump to
troubleshoot) or a partially blocked mixing elbow. (Re and re) Will also
assist him in verifying that throttle and shutoff are fully operable at the
engine and that the air intake is unrestricted. He recently replaced his
fuel filters.
Any other thoughts or expertise that might help?
Many thanks!
Dave - 33-2 (with a well loved and happy Yanmar)
Sent from my iPhone
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