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I’m no Tony but I’ve owned and run marine diesels for 20 years and this is a first.
REcon QSM 11-670 with 350 hours.
Steamed out 2 hrs at 1850, normal burn and temps. I then trolled all day at 800 RPM. At 2 Pm after about 8 hrs of trolling I started to power up as I always do, 800-1000 or so, pause, 1000-1200, pause, then up to plane at 1850.
As I passed 1100 RPM the boat shuddered as if the prop was bound up, I backed off, looked and Listened for a line on the prop then slowly powered up again. At 1150 same shudder and some brown smoke out the exhaust. I went through 1200 and right up to 1850, normal temps, load, etc but I had about 30 seconds of brown smoke which cleared. The engine ran normally for the 2 hour run home.
Mile from the harbor I backed off to issue and did 2 more power ups with no shudder or smoke.
Ideas on what this could be and what to monitor? STuck injector or turbo come to my mind.
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