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#1 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Time to play ... Name that Noise!
I noticed coming home last Friday in my 64 C20, that she would go in and out of a loud diesel sounding noise (seriously sounds like a large diesel engine) coming from under the hood. I was fortunate enough to have experienced an engine knock from my POS Neon about 20 years ago, and this noise certainly isn't that loud or pronounced, though it does sound a little too loud/thump-like to be a lifter tick. The noise comes and goes at all RPMs, with or without me applying gas, and in every gear. Sometimes at red lights, sometimes while driving. It usually last for 1-3 minutes or so. I recording the transition (at about 13 seconds) from "diesel" noise to standard tonight after letting it idle in my garage for about 10 minutes. I should also mention I put a bunch of 10w40 in when I got it home after buying it, because it was completely dry, and that was all I had at the time. Any thoughts?
For now I plan on trying Rislone and/or Motor Medic, changing the oil filter and filling her up with 10W30. https://drive.google.com/open?id=0B6...2pIeVNpcnpybGc Last edited by cshanek; 03-20-2017 at 10:35 PM. Reason: Bad link |
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#2 |
Registered User
![]() Join Date: Jul 2009
Location: Menifee, CA
Posts: 471
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Re: Time to play ... Name that Noise!
Sounds something like piston skirt slap.
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#3 |
Registered User
Join Date: Oct 2016
Location: San Diego, CA
Posts: 552
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Re: Time to play ... Name that Noise!
I'm not liking the "completely dry" oil part of the story. Which engine is it?
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Everybody has to believe in something. I believe I'll have another beer. |
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#4 |
Junior Member
Join Date: Feb 2005
Location: topeka, kansas
Posts: 258
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Re: Time to play ... Name that Noise!
Sounds like lifters/rocker arms - I'd like to know what your oil pressure gauge was reading. If you were that low on oil you were probably intermittently losing oil pressure and intermittently the hydraulic lifters were running dry.
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_______________________________________ 62 SWB BBW (under construction) 86 Vette Convertible |
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#5 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
It is a 283. I only recently (bought about 2 months ago) noticed this noise come and go.
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#6 |
Registered User
Join Date: Oct 2016
Location: San Diego, CA
Posts: 552
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Re: Time to play ... Name that Noise!
The thing with engine noises is they usually aren't intermittent. When it's making the noise, does it change with engine load? Like louder, or a double tap instead of a single tap? Does it run rougher?
__________________
Everybody has to believe in something. I believe I'll have another beer. |
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#7 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
It's very intermittent yes, it does get louder as the engine gets louder, higher RPMs before shifting, but I do not notice any loss of power or other change in how the truck runs when it makes the noise.
I will try to get a high quality recording tonight, since the one I posted really doesn't do it any justice. The engine noise easily drowns out the normal operational noise. |
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#8 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
I watched some skirt slap vids and yes it does sound very similar (https://www.youtube.com/watch?v=Wbwkz9833eg) though it gets a bit more "knocky" at high RPMs. Any idea why it would come and go?
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#9 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
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#10 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,610
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Re: Time to play ... Name that Noise!
What carb?
What distributor? Where's vac advance hooked to? Ported or manifold source? What's your initial timing? |
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#11 |
Registered User
Join Date: Oct 2016
Location: San Diego, CA
Posts: 552
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Re: Time to play ... Name that Noise!
Grab the fan and try to shake it back and forth. Possible water pump issue?
__________________
Everybody has to believe in something. I believe I'll have another beer. |
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#12 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
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#13 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
Update:
So I decided randomly to check my oil again last night during my 15 mins of free time, and the dip stick was dry again. I leak a little bit nightly in the garage ... something to the tune of 1-2 inch diameter spot on the garage floor, but certainly not quarts, so I guess I am burning oil, which might explain a little bit of smoke I get when I stop at lights. I still do not know what part is causing the noise, but I would imagine low/no oil could have something to do with it. Perhaps cracked rings is causing me to burn oil? |
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#14 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
Posts: 190
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Re: Time to play ... Name that Noise!
piston slap or wrist pin slap , usually a wrist pin will get a diesel sound
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#15 |
Moderator
![]() ![]() Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Time to play ... Name that Noise!
Mine sounds something like Brrrrrrrrr, tink...wham.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#16 |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
So I filled her up with Oil again, added some Rislone, and ran her for about an hour, and she was just purring like a kitten. Unfortunately I am leaking a little oil (see pic) and probably burning a lot, so I will be doing a compression test sometime this week and hopefully it will just be a head gasket issue.
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#17 |
Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: Time to play ... Name that Noise!
Check the right side of the timing chain cover to see if a worn chain has rubbed thru the cover & is leaking oil.
As to the noise, IF you have a lifter intermittently collapsing on an INTAKE valve this could be the "Thump" you describe. If the piston starts down on an intake stroke & the intake valve don't open at the proper time the piston will generate a higher than usual negative pressure, and when the valve does open late, the resulting rush of air will "Hit" the piston & cause a "Thump". This phenomenon is more prevalent on diesel engines with worn cam lobes than gasoline engines though. What does the correct answer win? ![]() |
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#18 |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Time to play ... Name that Noise!
Ya'all wanna hear what toasted lifters sound like????
Meet my 292 I6 gas version of a cummins! Recessed valves and 95 psi compression, but Man she pulled hard with that 4 barrel! Had 15w-40 in this vid. Skip to 1:27 for clatter. https://www.youtube.com/watch?v=0H6MOkFshSU
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1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#19 | |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
Quote:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 |
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#20 | |
Registered User
Join Date: Mar 2017
Location: Colorado Springs, Co
Posts: 35
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Re: Time to play ... Name that Noise!
Quote:
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