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Old 02-11-2008, 02:32 AM   #1
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Default Propeller Clutch

I am a new boater that recently puchased a 2000 Maxum 2700 SCR. The boat has a proported 130 hours on it. I must state that although I am relativly familiar with automobiles I know very little if anything about boat mechanics.
On the last trip out I heard a funny clunk noise emanate from the engine hold accompanied by a vibration that whas not there before. Bear in mind this was only the third time I had taken the boat out so I am not "in tune" with the boat and its normal operating sounds and performance. The vibration and noise disappeared as soon as I applied more throttle and did not reappear.
I took the boat out today and noticed that at any given RPM the boat was not travelling at a speed that I felt was appropriate. In other words I should have been travelling much faster for any given RPM. The engine sounds and runs great just no speed.
When I got home I checked the survey report I had done prior to buying the boat to confirm if my "seat of the pants observation" had any merit and it appears as if there is a problem. At 3000 RPM during the survey we were travelling at roughly 23 MPH now I am lucky to get 10.
I called a friend that has a friend that once owned a marina and knows boats and his response without seeing the boat was that the propeller clutch was bad or going bad. Does this make sense? I'm so ignorant about boat mechanicals that I didn't even know there was a clutch.
My two other questions are: Can I accomplish the repair myself? I am very mechaically inclined especially if I have some sort of manuel to refer to. The other is how much should a repair of this sort cost if I have done professionally.
Thank you in advance for your input. It is very much appreciated.
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Old 02-11-2008, 02:57 AM   #2
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welcome to the zoo...I might be able to help you more if I knew what engine/drive combo you have....ie...454 with a b2 drive or big block with a b3 drive (counter rotating props)....you definitely should be moving alot faster...but on one note..you don't have a clutch on the outdrive....if anything...my mind tends to think you spun a hub on the prop...meaning the rubber part in the middle of the prop spun and won't spin up to the rpm needed to move the boat.....
feel free to contact me via email and we can talk more about what is going on...also ...where are you boating at ?.....lake....sound..bay...salt..fresh...etc...giv e me an idea where your at...
the other big suggestion I implore you to do is take a boating safety course by either the coast guard...the CG aux. or boat US.......that will give you alot of boating knowledge for the money....

Steve
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Old 02-11-2008, 03:50 AM   #3
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Sorry for the incomplete info. I have a 7.4 bigblock single with the B3 outdrive. The boat is located and used at Marco Island FL.
I have taken two online couses, one by the USCG and the other by Bennet Marine. Very basic stuff but no mechanical info.
I browsed through some older posts on this website and found a reference to this "spun prop". This sounds exactly like the problem I am having.
What is involved in removing the prop? Is it just removing the large retaining nut? Is the engine compression enough the keep the motor from turning while removing the nut?
Thanks again.
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Old 02-11-2008, 04:30 AM   #4
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Hi Mantagolas

ok..so now we know what to look for...you need to get a big assed b3 nut wrench....then put a 2x4 chunk of wood between the inner prop and the cavitation plate.....call your local prop shop and see if they know the torque settings...(sorry..mine are on the boat and it's in the shop for a bunch of stupid things I did)...anyway...when you pull the props..take them both to a local prop shop and have them re-hubbed..balanced..and cleaned up if needed...it will cost a couple hundred bucks but that's what it's going to take...finally when you put the props back on ..the inner prop should have one blade in the 12 oclock position...the outer prop should have it's blade in the 6 oclock position.....torque the inner/outer prop nuts to spec......

let us know how it goes....
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Old 02-11-2008, 09:27 AM   #5
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Got it. Sounds pretty straight forward. Many thanks for all of help and info. I will definitely be back with a progress report. Looks as if I know what I'll be doing on Wednesday (my day off)
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Old 02-11-2008, 11:29 AM   #6
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One more quick question. I'm assuming that there is a seal on the propshaft that prevents leakage of oil. I don't have to drain the lower unit do I? I will be working from an inflatable kayak as the boat is stored on a lift and I have no trailer. The last thing I want to do is create on oil slick!
Have a great day.
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Old 02-11-2008, 01:56 PM   #7
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Don't worry about that, the drive is totally sealed. All you are doing is removing the props from their shafts. Its pretty straight forward but if the nut has seized a bit then you can expect some sore knuckles and frustration... It might be an idea to take a can of WD40 with you. And also, whilst your working on the drives give them a good wipe over and clean up if required.
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Old 02-12-2008, 10:41 AM   #8
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Thanks to all for your advice. Going to tackle job tomorrow. I understand that an 1 1/8 socket will pull the nut as opposed to spending 80+ dollars for the mercury prop wrench. If anybody knows otherwise please post a comment.
I'll be back with an update for those who are interested tomorrow evening.
Loving my new (used) boat and the recreational opportunities it provides my family.
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Old 02-12-2008, 04:23 PM   #9
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take a couple of wrenches...it starts at 1 1/8th and goes up I think for the inner nut........I don't have the breakdown here at the house..but you can call the local boat shop and ask what are the sizes of the nuts.....

good luck and let us know how it goes...
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I live in my own little world....but it's okay-they know me here!!!

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Anyone that sez "Size doesn't matter" has never owned a boat!
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Old 02-14-2008, 12:11 PM   #10
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Sorry but the weather did not cooperate yesterday. Very cold and rainy. Will try again on Sun. my next day off.
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