Have similar problem except my revs are limited to 1600, but only in reverse.
Forward revs are normal.
An very experienced marine mechanic diagnosed problem as excessive load on the
prop.
I later found my prop was clear. However, after investigating various reports I
now believe my feathering prop is not going into the correct pitch in reverse
and putting too much load on the engine. Likely because I did not adequately
lube the hub of the prop.
I will know more when I haul the boat and disassemble the prop.
I initially didn't think over pitch could reduce revs on a 40 hp diesel by that
much. After reading similar reports I believe that is the problem.
If engine cannot reach operating RPM in both forward and in reverse on a fixed
prop, then the prop may be fouled.
Harvey
On Monday, September 14, 2020, 11:35:08 a.m. EDT, ALAN BERGEN
<[email protected]> wrote:
My previous boat was an Ericson 2-30, which came with an Atomic 4 engine. If
your neighbor's boat originally had a gas engine, the tank has a filter at the
end of the pickup tube. Try removing the pickup tube and see whether the filter
is clogged. You can clean it with a solvent, or remove it completely. Your
primary and secondary filters are enough.
Alan Bergen35 Mk III ThirstyRose City YCPortland, OR
On Mon, Sep 14, 2020 at 7:52 AM David Miles <[email protected]> wrote:
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 <[email protected]> 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)
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