Major vibration

[timk578]

Ok guys i am stuck and need everyones opinion....2.4 200 carb on a vulture...Running down the river about 4500 started to slow down for the up coming bridge slowed to 4000 rpms and had a major vibration...it was vibrating the whole boat but mostly the windshield...I stopped trimmed up check my prop looked fine I put it back into gear and went to get up on plane same vib at 4000 RPM ....idled home ...next day diff prop same prob...went home looked everything over found one jackplate bolt a little loose..tightened it up...removed fly wheel and found stator had swelled and was rubbing flywheel...changed stator put flywheel back on same prob...changed flywheel same prob... dropped lower and ran boat on hose same prob...I tookheads off everything looked clean and wet with oil no scoring....took intake manifold off to get to connecting rod bearing caps..everything looked good checked torque at 30 ft/lbs as per manual..... where should I go from here?

[TEXAS20225]

Check your top crank bearing

[timk578]

Ok I will do that I have read about people installing the wrong bearing and haveing a vib but Ive ran this motor all summer now

[David Borg]

top crank bearing , would also check bottom bearing and seals while you are at it .

Good luck

[timk578]

makes sense thanks My flywheel pullers in the mail ive been bumming one for way to long!!

[HStream1]

Check your top crank bearing


:iagree: You beat me to it. I was going to E-mail you today Tim to suggest just that.

[timk578]

Can I remove and reinstall the top bearing without splitting the case?

[Eagle One]

yes. Just loosen the two upper main bolts and you should be able to remove the electrics and pull the main cap right out.

[HStream1]

Can I remove and reinstall the top bearing without splitting the case?


Noah is correct check your PM.

[timk578]

got it guys thanks for the help ill let you know what i find!!

[timk578]

top bearing is out everything looks normal all the needle bearings are there...I was reading in my seloc about crank endplay measurement....what do I need to do next...powerhead is still installed but I guess next step is to remove and check bottom bearing?....help guys this is getting frustrating..I didnt see any inspection criteria in the manual for the bearing is there any

[John Richied]

I know you said you dropped the lower unit and ran it on the hose but just in case you ran it on the hose with the gearcase in order to have water pressure I thought I would mention. I have seen the gear cases have problems and the vibration resonate into the powerhead making it sound like powerhead problems.

Also check your motor mounts…

[HStream1]

Tim ref our E-mails and telcons? Did you check crank with a dial indicator prior to removing the upper bearing carrier assy? Like I mentioned? I.E. axial play. Just because it looks good doesn't mean it is good. Also remember our telcon about rotating mass and reciprocating mass?

If something rotates and it vibrerates ??? Without actually looking at it UMH??

Bent Rod? Cracked Crank or Bad Crank Bearing(s). You changed flywheels problem still exist there were no cracked or missing magnets ??

Lower was removed and vibration still present??

[timk578]

I did not check the crank with a dial indicator before I removed the top bearing....I think the powerheads coming off at this point to get torn down...im done messing with it.....the powerhead is on the mid with no lower right now with the vibration....

[HStream1]

The solution was :eek: ?.

[timk578]

Never found it the boat is in western NC now

[HStream1]

Thats a shame you got rid of such a nice boat without simply finding the problem. Should have only taken maybe 30 minutes max to isolate it.

Because after speaking with the new owner and discussing a few things. It was simply tightening the powerhead bolts back down to the mid.

Had to re adjust the timing and idle for some reason ------- But!!!

Motor runs like a Scalded Azz Ape. No vibration what so ever. He just needs to get the right flywheel back on it.

[timk578]

I spent Hours and hours on that problem....there was def more to it considering I had the power head on and off 3 times looking for that problem.....IF those bolts were loose it was because I was rushed to remove then reinstall the cowling base plate.......I loved that boat but I needed to move on I was getting way to brave driving it and its only a matter of time until a mechanical or mental mistake ruined a nice boat and my body. I hit a wake from a wakeboard boat going a little to fast and scared the chit out of myself then I started thinking about it.