Offshoreonly.com - Clicking,tapping noise after shutdown

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Quote:

Originally Posted by 35fountain (Post 3378436)

Hopefully someone will know what this is...:eek:

I put a new set of heads on my 502's..One engine is making a clicking, tapping sound for 20 seconds after i shut it off and its coming from under the valve cover area. When it runs its smooth and has no valve train noise..It happens cold or hot..I adjusted the valves several times and set them differently to see if it made a change..Zero lash with a 1/4 turn, then i tried zero lash with a 1/2 turn, zero lash with a 3/4 turn.. I even cut up an old set of valve covers and adjusted them running .. With the valve cover and engine off i touched one of the rockers and you can feel the click..almost like something is moving still..It only lasts 10-20 seconds after shut down...
see video
Please help ??

Try some thing simple to find where the noise is comming from start it with your cut valve covers then listen with a piece of hose to your ear to find better WHERE the noise is comming from good luck

Quote:

Originally Posted by 35fountain (Post 3380644)

Thanks for the info.. I read the article..

The only thing is i'm not building a new motor. The parts in my new heads were parts from my old heads that were in great shape..The only thing that is new is the head castings, new head gaskets,intake etc. The only thing i did not do is keep all pivots, nuts, rockers and pushrods with the same and to the same place. So hopefully that is causing something not to seat properly when running and causing a odd noise during shutdown.

The last video showed excess movement almost like it was wobbling side to side. I realized after the lifter bleeds down you get some extra play..but not like that..It seems like the part that touches the valve stem of the rocker is worn and not sitting flush. I will check the pushrod length and make sure the roller is centered on the stem.

lets see what happens after i install the new rockers and pushrods

Where the new heads shaved before you got them? That would require different push rods then what you have.

Anthony

I don't know if they were shaved.. I'll have to ask the machine shop. If they were you would need shorter pushrods ??

Milling the heads will probably NOT require different pushrod length. You mentioned .100 long valves, that could require different length. Bottom line it is proper procedure to verify the length with any rocker arm change. It is very easy to do and you may find it is just fine, however, you may find a problem. Pushrods are available in .050 increments of length. Good luck.

I installed new Comp Cams steel rockers with roller tips and new pushrods..No noises after shutdown.
Problem Solved. Thanks for everyone's input on helping me with my problem.
Happy Holidays

Thats great news. Happy boating.

Quote:

Originally Posted by 35fountain (Post 3385420)

I installed new Comp Cams steel rockers with roller tips and new pushrods..No noises after shutdown.
Problem Solved. Thanks for everyone's input on helping me with my problem.
Happy Holidays

Glad to hear it, now get out and enjoy it !!!

Is even at all possible to get the youtube or video of what this problem sounded like. long story but the jist. Have a customer's boat with a rebuilt V-8 350 CID that has been moded. The boat is still winterized and the owner was describing a clicking noise after shut down that has gotten worse at the end of last year. He wanted another opinion about the noise. Hence I have it now

The motor was rebuilt summer of 2012 buy someone else. They told him at winterizing its just heat / expansion / cooling taking place after shutting engine down.

I was thinking it might be something in valve train area not set up right or a failing part. We have not summerized as of yet nor dug into it. Did a search to see if I could maybe pinpoint an issue and found this.

It sounds like this could be the same problem as described by the owner of the boat - warm the motor up loud clicking noise after shutdown & seems to have gotten worse. I might be right about a valve train issue. Thanks for the help.

forgot to mention as I just read the whole thread here. the first thing that came to my mind is wrong push rod lenth too long and rocker problems. any other opinions on this. thanks John