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Anyone recognize this sound from the engine? |
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uncle-buck 
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 Topic: Anyone recognize this sound from the engine?Posted: August-23-2020 at 5:31pm |
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Been working on my 1990 Ski Nautique with the PCM Ford 351 engine.
Yesterday, I noticed a strange clanking while the engine was running on the FlushPro in the driveway. Sounds like it's coming from the top of the engine and it continues for about 30 seconds after the engine has been turned off. Any ideas on what it might be? Here's a link to a 15 second YouTube video of the issue: |
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Gary S
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Posted: August-23-2020 at 8:11pm |
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Not off hand but - something clicking that loud has to be felt.With it off like that get your hand on the starter,solenoid and maybe the choke and see if you can feel that tapping. Does it do that every time you turn on the key or does it have to run first?
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uncle-buck
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Posted: August-23-2020 at 8:38pm |
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It only happens after the engines runs. Sounds and feels like it's coming from underneath the valve covers.
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8122pbrainard
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Posted: August-23-2020 at 8:56pm |
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Bert,
Do you have the garden hose turned on all the way? To me, it almost sounds like a thermal tick from cold water in a hot engine. Is there a T stat installed on the engine?
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uncle-buck
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Posted: August-23-2020 at 9:10pm |
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Peter,
Appreciate your reply. I did not have the garden hose turned up all the way, but a thermal tick is possible because the noise appears to move around, from one side to the other. And the engine does have a 143F thermostat, recently installed. Also recently:
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KENO
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Posted: August-24-2020 at 7:11am |
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I didn't know how far I should turn up the volume when I watched the video so it's kinda hard to decide how loud the noise is
 I'm kinda sorta maybe thinking it sounds like a hot engine/manifolds that weren't being cooled too good when it was running and some hot metal is contracting How's your flush pro working? Is the RWP moving water? Did you have the RWP off and reinstall it upside down? How's the impeller in the pump? Getting plenty of water out the exhaust when it's running? So many questions |
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uncle-buck
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Posted: August-24-2020 at 8:02am |
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Ken,
The FlushPro works well as does the raw water pump. I had the pump off and replaced the impeller a couple of weeks ago, and reinstalled correctly with the cam screw oriented towards the engine block (LH engine). Lots of water is coming out of the exhaust. When I replaced the exhaust manifold gaskets yesterday, I noticed fairly heavy rust on a couple of the mating surfaces. I did not remove the manifolds from the risers and inspect them carefully. Is it possible that one of the exhaust manifolds has rusted to the point that water is leaking into one or more cylinders? What are the symptoms of that? Thanks |
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uncle-buck
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Posted: August-24-2020 at 9:27am |
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BTW, I started and ran the engine for about 30 seconds this morning. Could hear the noise for a few seconds after turning it off. So it is probably not thermal tick caused by cold water on a hot engine - because the engine was still cold.
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KENO
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Posted: August-24-2020 at 12:43pm |
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I'd pull the plugs and turn the engine over with the starter and see if any water comes shooting out from any of the plug holes. And look at the plugs as you take them out for any signs of moisture
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uncle-buck
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Posted: August-24-2020 at 1:08pm |
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I pulled the plugs and did not see signs of moisture on them. Also, checked compression. Low was 133, high was 145, avg. was 138. Did not see any signs of water coming from cylinders with spark plugs out. |
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KENO
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Posted: August-24-2020 at 8:12pm |
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That's all good news for you I decided the noise sounded like my pan cooling off after I fried a couple of eggs this morning
................but that doesn't exactly do you any good |
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uncle-buck
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Posted: August-26-2020 at 10:48pm |
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Friends,
This issue stumped a number of experts including a former PCM tech executive. It turned out to be a valve train lubrication issue. Changed the oil and filter, added a bottle of Rislone oil treatment, and the noise went away. Thanks for all of the comments and suggestions. |
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KENO
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Posted: August-27-2020 at 7:09am |
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So how was this figured out? A shot in the dark oil change, some Rislone "magic" or something else? The skeptical little voice in my head says maybe it'll be back at some point.
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uncle-buck
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Posted: August-27-2020 at 7:43am |
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Isolated the source of the noise to the valve train and did some research online. Found this blog: https://soundproofpanda.com/silence-noisy-lifter-tick/ Oftentimes, the solution to a complex problem is simple. This was one of those times... |
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KENO
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Posted: August-27-2020 at 7:50am |
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The little skeptical voice in my head still says the same thing |
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uncle-buck
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Posted: August-27-2020 at 7:57am |
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Eventually, the Earth is going to get sucked into the Sun and burn up without a trace...
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KENO
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Posted: August-27-2020 at 8:01am |
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If you say it's fixed, it must be, it's your boat
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uncle-buck
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Posted: August-27-2020 at 8:16am |
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I think something was interfering with proper lubrication of the valve train. It could have been a clogged oil passage, degraded or contaminated oil, a clogged oil filter, or something else. The boat hadn't been used in six years and I neglected to change the oil and filter when it was brought out of storage. So we'll see what happens. In any event, I appreciate your efforts to help. |
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KENO
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Posted: August-27-2020 at 8:26am |
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I hope it works out for you.
I think if you mentioned the 6 year storage and no oil change in the first post, that would have been good info for people to know and somebody would have at least suggested an oil change If you want good help, good background info is usually pretty helpful Get some hours on that thing now.
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SNobsessed
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Posted: August-27-2020 at 8:27am |
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You might want to change the oil & filter again after a few hours of use. It sounds like there was sludge build up & now that is inside your filter. If it clogs, oil bypasses.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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uncle-buck
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Posted: August-27-2020 at 8:28am |
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That's good advice and I will follow it.
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KENO
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Posted: August-27-2020 at 8:39am |
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Hang on Buck
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Gary S wrote: