Logo
FULL SITE MENU

merc 350 engine noise help

My suggestion is to "Close Out This Thread" and start a new one with "current conditions and problems". This thing has taken on a life of it's own and about unusable. The problem, as I see it, is too much old stuff being hashed over that has been rectified and / or not updated completely and / or accurately, confusing the issue, with everyone trying to help and cover all possible scenerios turning this into somewaht of a monster.

We are all too happy to assist, but need accurate and timely intel on current conditions. I believe most of the posts to be valid info, attempting to cover all the bases, based on past experiences and loaded with good info. Just like typing in "Mercruiser Parts" into Google and see how many pages of mostly pertinent info floods the screen covering everything possible. Internet has good points and bad points. Information Overload..... Just like suggesting PCV. Not used in 98% of the installations, but there have been some, so it is a valid question to ask as it had not been brought up before and "could cause" one of the conditions as described if this is one of the 2% of the installations.. Just covering all the bases. In my humble opinion.
 
Last edited:
The "thingy in the plug hole" is good to tell you if timing chain jumped and especially works great if used with a degree wheel and proper proceedure to verify damper is actually indicating TDC. I actually have the tool set to do that and used it many times when I was building / blue-printing Pro Racing Hemi's back in the '70's. It was one of the first things that you did on a build / blue-print to get the cam timing correct with no timing chain cover on a short block, except there were no heads, just a plate on block deck with a bolt in it to stop piston upward motion. Vibration damper outer rings sliping, timing chains jumping and wrong timing covers / covers with timing tab busted off are not that uncommon.
 
Last edited:
In addition to what's happening in this thread, I sense that some members are not fully reading previous posts..... and I understand that on a very long winded thread, such as this one!
But we are skipping forward, and may be missing some of the comments and information previously posted. This recent post is a prime example. It had already been suggested in post #90 that a New Thread be started.

Please Mr. Dan......... start a new thread! :D :D :D
Then after you do so, come back to this thread and post a hyperlink to the NEW thread.
We can all begin fresh, with fresh ideas that are not cluttered with unrelated issues.
Fair enough?

*******************************

But while we're here; In all of my 45+ years of working on engines, I have yet to see a how a good condition timing chain and sprockets can slip a tooth or two, yet not be damaged and yet continue working? These chains do not stretch, and then miraculously snap back into normal length. (a cogged timing belt, yes!)
This is a Myth, likely started by some Hill Billy who used worn parts, and then blamed the worn parts.
I think that we need to quit spreading this misinformation.

If a good condition chain and sprocket system is off by a tooth or so, it was not indexed correctly to begin with.
Would you agree?

.
 
Last edited:
Back
Top