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Old 05-13-2018, 11:55 PM   #1
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Default 7.4 l mercuriser 2000 arc Maxum

Hey all, Iím having an issue Iím hoping i can get some help. I have a 2000 Maxum scr2800 with a single 7.4 mercruiser. The boat was running fine on my way out to the bay today nothing out of the ordinary happened and on the way back I couldnít get over 5mph the rpms were moving and got up to 3000 but the boat wouldnít accelerate. Any ideas?
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Old 05-13-2018, 11:59 PM   #2
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Welcome to the site.
Any noise?
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Old 05-14-2018, 12:00 AM   #3
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No the engine sounds fine once I try and push it I get a slit rattle tho
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Old 05-14-2018, 01:34 AM   #4
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Welcome aboard

So the engine was turning 3000 rpm and the boat was going 5 mpg, correct? What outdrive? Sounds like either a spun prop hub or engine coupler.
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Old 05-14-2018, 01:52 AM   #5
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That's why I ask for any noise.
I guess is the engine couplet.
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Old 05-14-2018, 10:19 AM   #6
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Any smell of burnt rubber in the ER. Coupler spinning will usually be accompanied by a strong smell. To check prop, make alignment mark the outside hub of the prop and on the nut/shaft. I use a small punch to make the marks.
Note the alignment of the marks and make a pull in gear simulating the normal operation. Shut down and observe the marks. If they aren't aligned anymore, the prop hub is slipping.
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Old 05-14-2018, 07:22 PM   #7
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Thank you all for the advise, I will update you when i diagnose the problem for sure.
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Old 05-14-2018, 07:23 PM   #8
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its a bravo 3 dual prop drive
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Old 05-14-2018, 07:25 PM   #9
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it had a little smell of possibly burnt rubber and some one on the boat said they did see a little dark smoke from the stern.
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Old 05-15-2018, 12:33 AM   #10
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Quote:
Originally Posted by Bobportante View Post
its a bravo 3 dual prop drive
B3 has solid hubs so itís the coupler. The engine needs to come out to replace it.
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