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Old 06-23-2008, 05:32 PM   #1
Lt. JG
 
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Default Engine Vibration

Greetings fellow Maxum owners!

This is my first post! What a great discovery finding this website!! Here's my situation... I recently purchased a 1994 2000 SC, 3.0 LX w/Alpha 1 outdrive and (sadly) Im experiencing an excessive engine vibration issue. It is only noticable at idle to ~1100 RPM, but it is so excessive the entire boat shakes violently whether the drive is engaged or not.
So now my questions... Has anyone experienced this problem? What was the cause/source of the problem? How much did it cost to fix the problem? Should I hold off from using the boat until the vibration problem is fixed?

Thanks for your help!

Fair winds and following seas -
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Old 06-23-2008, 06:00 PM   #2
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well...the very first thing is welcome to the zoo...hope you can stick around some...

second...when was the last tune up done on it...being a 3.o ltr engine...it's gonna vibrate some....but if the spark is falling off at idle ..then yeah...it's gonna shake like an out of balance blender.......new plugs...rotor...distr. cap....and wires!!!....will probably fix it....atleast this is the cheapest avenue to persue ....then if it's still doing it...there are other things that need to be asked....


SP
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Old 06-23-2008, 07:14 PM   #3
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Hi SP, Thanks for the welcome and your response. The plugs, cap, rotor, wires, fuel filter, oil, etc were done the end of May. The boat has been used twice since then. I suppose I could shoot a timing light on it to see if there's a timing issue, but I am curious what the next level of questions to ask are...
Thanks!
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Old 06-23-2008, 08:03 PM   #4
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well..the 4 bangers are notoriously nervous.....so....one thing to check out is if there is a vacuum leak at the carb....get a squirt bottle of soapy water and spray at the base of the carb while it's idling.......if it smooths out...retorque the carb down....you might also try adjusting the idle mixture screws....run them in until seated lightly..then back out 1.5 turns...back out .5 turns at a time until it smooths out...then stop.....adjust idle to 650-700 rpms....if that doesn't do it...you got something else going on...maybe a bad plug wire or dead plug at idle....

SP
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Old 06-24-2008, 05:29 PM   #5
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Default Take a few things off the checklist...

So this morning I did a compression check on all 4 cylinders, thinking (but not hoping) that I might find a bad cylinder. Readings are #1 @ 132, #2 @ 120, #3 @ 135 and #4 @ 122... for the most part acceptable (within 20psi). I did make the following observation... the engine shakes wildly when I was cranking it... the bucking with transmitted throughout the entire boat, and the stern looked like it was about to snap off. So I assume that it's not a carburator or ignition issue, but rather something is either misaligned or loose... or even worse, maybe the crank is out of balance?
Any thoughts would be greatly appreicated!
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Old 06-24-2008, 06:46 PM   #6
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man...if your doing that much movement...something is definitely off...I'd check back of the engine but also ...make sure the firing order is correct.....that may be the problem........in the back the only thing that could cause that much movement is the u-joint or copler.....check those...other than that ..no way the crank can get out of balance....you'd hear something rattling around down there...

SP
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Old 06-24-2008, 07:17 PM   #7
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Are these engine externally balanced? if so has the front pulley come loose from the crank, well not the pulley the balancer behind it

Or could be fly wheel loose or drive plate
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Old 06-24-2008, 07:21 PM   #8
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Just re read your post has it done it from day one of owning the boat?

Or is it something that's just started?
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Old 06-24-2008, 10:05 PM   #9
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I noticed the engine shake when I went to look at the boat the first time (it was on the trailer). The boat had just been tuned and readied for summer so I asked the previous owner if the marina had pointed out the engine shake, but apparently they didn't. I also called the marina and spoke to the service department and they didn't have anything noted about it in their service logs either. Everything looks mint under the hood, and it runs like a champ at speed... oil pressure, temp, everything is within spec.... just shakes like the engines sitting on jello when your at idle.
Im going to bring it in for an appointment to the marina that worked on it last - they've serviced it for the last 3 seasons so hopefully they can figure out whats going on.
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Old 06-24-2008, 10:29 PM   #10
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I just drove a 3.0ltr engine about a month ago...it didn't shake like your describing.......somethings off then....let us know what is going on....

SP
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Don't compare your life to others. You have no idea what their journey is all about.
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I live in my own little world....but it's okay-they know me here!!!

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Tap-Rack-Bang

Anyone that sez "Size doesn't matter" has never owned a boat!
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