anyone ever have a sound like this ?
 

I know the one sound you can hear an exhaust leak but the " non symmetrical " Ting ----ting ting, I can't seem to figure it out. i had the valve covers off and looked for a broken spring thinking it might be a valve hitting the piston . the boat runs good and doesn't miss or back fire or pop any ideas ?


https://youtu.be/C8RT0lx3grQ

Is the sound on top of the motor or outside near exhaust? We know it's not low.

Don't think it's a valve hitting a piston .

The internal flaps on my Hardin tips sounded like that even though they're rubber.

If not ^^^ exhaist internal flaps or muffler baffles then pull off rec pump belt and see if it's shot by grabing it's pulley and see if it moves up/down side to side

its in the engine compartment just can't tell where ?

Maybe Some little China men in there clapping to the beat of a real engine. Go USA... Shut the hatch and blow dem nigas out of there. Ha

Use a stethoscope to help you locate noise.

kinda sounds like an exhaust leak.

Fwiw, I pulled my internal flaps out and left the Salisbury flaps on just so that I could relax. It was killing my nerves before I ever left the dock.

Sounds like a cracker fly wheel to me.

Is that different from negro flywheel?

Sorry couldn't resist

Sounds like internal exhaust tip flapper to me. Put your hand on the tailpipe hose near the transom.
Does it go away with some rpm?? Flapper noise will go away with with a few hundred more rpms.

Yes. Way different. Lol!

Negro flywheel would be a lot larger, right? ;)

My boat has developed what I would describe as a "chirp" coming from the exhaust, but it is a steady sound that seems to be in time with the firing order. Ran a compression test the other night and all were at around 180 - 185 psi. Some OSO'ers have said that it might be a loose baffle in the exhaust muffler. Planning to try some different muffled tips to see if it changes any. Good luck with yours.

stick broom handles up the transom exhaust to keep the internal flappers open while running the engine - this will rule in or out if thats your noise. Process of elimination the start of it

pull tips / mufflers shake the hell out of them by hand --- Noise ??? run engine however without the tips / mufflers installed ---- Noise ???

A real doctor stethoscope will find this noise in about 15 seconds. Use one all the time best tool to have for marine noises hands down.

Were you at Cumberland Thunder Run???

There was a boat in my fleet that had a chirp noise from exhaust. ...and somehow I got behind him at each stop. That chirping noise was driving me crazy!! LOL

My vote is an exhaust flapper. Does the noise change or go away with a little rpm?

No not really , I took the recirculating pump / alternator belt off and it seemed to go away but the engine got louder (threw me off a bit) but I think the RPM's just went up because of the belt being off . So I think it's the alternator or the recirc pump and I will try eliminating the flappers as a possibility as well

my guess is a broken metal impeller piece inside of the WATER CIRC PUMP

I think BUP is hot on the trail. Was running a non-marine circ pump on my boat many years ago, and I started getting a weird noise from the front of the engine. When I pulled off the circ pump and took the back cover off, all that was left of the stamped steel impeller was a few little shards that were scraping the housing. Funny thing was that the boat wasn't running hot at all. The seawater pump moves enough water on its own that the circ pump is usually just along for the ride. Hell, I was probably saving a few HP not spinning the full impeller. :)

Nope, wasn't me - I was at Green River Lake this past weekend. I have a complete thread with a video somewhere on this forum. It makes a similar sound to what you hear coming from some of the high HP, high compression drag cars when they are idling at the starting line.

Check your exhaust manifold gaskets.

Omg !!! I blew up an impeller on the trailer at the end of last season trying to winterize . It came apart because of a chip in the housing. I wasn't sure I got all the pieces out and it seemed to run a tad warm . WTF ...

It does not matter if the WATER CIRC PUMP front of the engine is a marine unit because alot people who never pull that hose to drain the water out completely when winterizing can end up cracking and or breaking off the METAL PORTION of the impeller inside the water circ pump. Have seen it plenty of times from improper winterization or owners who do not winterize. Also saltwater kills these pumps down the road.

I am NOT talking about the rubber impeller for inside a water pump impelling housing - I am talking about the water circ pump on the front side of the engine. It is called an IMPELLER AS well, it is metal.

this view pic -

http://www.300cforums.com/forums/att...vents-pump.jpg

found exactly what I was looking for - Mercruiser broken internal IMPELLER - the exact failures I see - pic below they make that exact sound clank a clank

http://cdn.vanillaforums.com/ballofs...28449fa739.jpg

Post #5 :faint2::party-smiley-004:

http://www.offshoreonly.com/forums/g...ml#post4453774


Edit in: Oh, I get it. Same part, different issue. My bad.

[QUOTE=Budman II;4453993]Negro flywheel would be a lot larger, right? ;)

They are bigger from what people tell me, also they are cheaper to buy but much more expensive to own and performance is less than any other flywheel.

Ok I get what your saying now and actually hope your right, I winterize by taking out the thermostat and pump 6 gallons of pink stuff through the engine then i remove the cooling line on the power steering cooler and make sure its running pink. I can't pull the recirculating pump off until tomorrow so i ordered this http://www.hardin-marine.com/p-13357...th-bypass.aspx (been wanting one anyway) They said it was plug and play , anyone know if there are taps for the temp sensors in the t-stat housings on these ?

Lots of people are running these, but a lot of them had to add water bypass valves and dumps for the extra water flow. These can also create headaches with hot spots on the heads, etc. Set up right they work well, and clean up the front of the engine. On a stock setup (no supercharger), I prefer to just run a circ pump myself. Do a search on this forum for those who have had issues with them. Probably much simpler to simply pull your circ pump and open it up to check it. There are several aftermarket companies that make replacement marine circ pumps, or you can probably find a good used one from someone who has installed one of the kits that you mentioned. ;)

You are going backwards by doing this and may present yourself with more issues. Oil temp, water psi, and the fact a lot of these the bypass puts too much cold water on back side of tstat and doesn't let it open.

Ck your recirc pump and if it needs replacing, replace it, and go enjoy the water.,

^^^^ Sound advice right here from a guy who knows... ^^^^

its too late
 

Too late , this is the second re-circ pump that has given me issues , I think the pulleys were messed up causing the bearings to get wiped out, it looks like the pulley was rubbing the harmonic balancer pulley. As far as hot spots in the heads and the proper flow , I think running restricters instead of a thermostat may help some. I know a lot of guys running them that have never had a problem. I put a 110 amp1 wire alternator in while i was at the whole mess.

http://i1329.photobucket.com/albums/...ps5v1srczb.jpg

http://i1329.photobucket.com/albums/...ps4y5r41oq.jpg