Strange noise... please help!
 

Hopefully someone can help me out here. Cruising last weekend and heard a whining sound. I didn't maker much note of it. Got back to the marina and (Of Course) dead low tide again, (starboard side) ran a little hot after sucking up mud and I had my drives all the way up in trailer position just to get the boat to move. Finally I just left it in a slip and returned the next morning at high tide. I back flushed the drive with a water hose and cleared out the mud..Temps fine, flowing good amount of water BUT now i have this strange scraping sound or metallic sound. Engines rev smoothly no knocking, good oil pressure,60 water temp142, water pressure 3t o 5 Can a U joint or a gimble bearing make this sound? The starboard drive on the top sides seemed to be warmer then usual just idling. warm water was not hitting the drive see videos

Thanks, any help would be appreciated

https://www.youtube.com/watch?v=poXn55VL_4k[/URL]

https://www.youtube.com/watch?v=FsE2cSha7ZI[/URL]

Not the best idea to go idling around with your drives all the way up. Gimble bearing would be my guess from the vids and your description

X2. Under circumstances I wouldn't let the temperature bother me. I understand u were in a predicament but as mentioned that is hard on ujoints etc. have you greased the gimbles in a while if not pump plenty in and see if it changes the pitch or sound in any way. If so then gimbles be your problem more than likely. You can pull your drives and manually ck bearing however I've had them feel fine yet replaced anyway and solved problem/noise. If you narrowed it down to what side it is pull it and ck ujoints also.

It's not another internal flapper issue is it?

I keep up on all maintenance usually..The u joints were greased 2 seasons ago...I don't pulled the drives every year. Boat is garage kept..The gimbals i may have missed a year or so :(...I plan on pulling the drive Starboard..checking and probably changing both the u joint and the gimbal bearing..As for internal flappers..Yes i have them Corsa..rubber with weight...not a clacking noise
Thanks for the input

Can you touch your toes and sprint while doing so ? Hah !

Your ujoints will get all bound up running up in trailer mode. Sometimes the u joint will hit the yoke ears and/or carrier nut ears.
Plus tons of stress on the gimble bearing.

BTW: I couldn't hear schit over the exhaust noise because this lap top's sound system suks. Errr.

Update... Replaced gimble bearing and both u joints today...Problem still existed...So i started to eliminate belts and the culprit is the circulating pump bearing dry and noisy. Probably mud sand got into the bearing
Thanks for all the help

Well at least your good to go with bearings and joints for a while.

Now that you mentioned what the problem was it seems like there was a thread a while back that went through same deal. Wish I could have remembered before hand. Good thing is your back on the water with mind at ease.

Yeah, I'm going to do the other side bearings and u joints anyway.. Can't hurt. I had this boat 8 years and this is the first change.. I never heard a bearing failing on the circ pump, usually its a seal and they start leaking, just like cars

If you work on boats enough of them - bearings do fail in the water circ pumps. Some to many boat owners would be surprise if you pulled your belt away and rotate the circ pump pulley by hand to find how notchy and or slight to heavy drag the rotation is. I find one about once per week. I would not run a water circ pump more than 10 years of useage. Saltwater is less than that. Closed cooling apps can last a very long time depending on somethings.

As we speak I have 2008 Merc MPI 350 HO MAG - All freshwater use with 118 hours the water circ pump bearing is shot. Rotation is not free at all by hand - BUT was barely noticeable when running thru out all rpm's. Never leaked a drop of water either.

If someone wants to post the video of it up here, I can send the video to your cell phone of what exactly I am talking about. If not no big deal.

did nt you have about 4 years ago videos of your engine making clicking noise after engine shut down ? If I recall it was something to do with your valve train set up ? Do you still have those video's. And what was causing your issue back then ? and what fixed it ?

I had one as well about 3 years ago - as I believe was like what you were experiencing ? Mine was his springs and push rod length was off for the jist of his problems.

Good memory..Yes a clicking noise after shutdown. The problem was the springs closed seat pressure. The j-rk that setup the heads set the closed spring pressure very high. He never asked what cam, roller, flat tappet, what kind of rockers rollers or stamped steel, he just assumed or guested what the pressure should be. So with all the spring pressure on the seats also the missing hardened seats from the factory..which he cut out when he was installing my larger stainless valves caused the exhaust valves to sink into the head...Had them redone with new seats etc..Been great till now with 160 hrs.
I'll see if i can find that video for you

Thanks I did remember about your app back years ago, actually 5 years ago. Back then I tried to click on your video but nothing would show and still does not.

If you can find it or how many vids you have, that would be great if I could get them. I was going to use them for some classes that I teach in the winter months. Thanks for the help. John

Here is your old post back in 2011, the vid does not show as I mentioned.

http://www.offshoreonly.com/forums/g...-shutdown.html

Could it be dirt in your seawater pump?

Or maybe the seawater pump got starved for water and something melted in there it's grinding

Changed the complete pump...Its the circulating pump.. new one on its way

Got it https://youtu.be/Em7AiDsmbEE

So, how was the high seat pressure causing the clicking noise?

I have a crane flat tappet cam and at that time it had stamped steel rockers (stock). I also have the compcams double spring with damper 924-16 set and they have a recommended closed seat pressure of [email protected] height. All i was told from the machine shop is that the closed spring pressure was way high probably above 150#. There is a limit on spring and seat pressure depending on your setup? Maybe the spring pressure was too high for the lifters and that noise in the video was a pressure release which ended up as a clicking sound. Actually they found a few broken springs also probably due to them opening too far or binding. I was told that the springs have a closed height and pressure and an opening height and pressure and if you go over the recommended settings for the type of valve train you are running there will be issues. There was in less than 20 hours. I'm glad nothing more than the heads and the rockers were bad.

924-16 1.509 1.125 0.697 Y 112 @ 1.900 355 @ 1.200 1.175 347 732, 721 1732, 741 4700, 4770

Thanks for the update and reposting the VIDEO. I will keep it for reference material. Thank you.