Piston slap?
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Junior User
Joined: Feb 2018
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Piston slap?
so started the truck this morning and could hear a funny ticking noise. Upon opening the hood I could hear it better and placing my hand on the driver side spark plug 2nd from the front I could feel it tapping. What’s the fix for this?
Logistics Pro
Joined: Aug 2015
Posts: 4,093
Likes: 14
From: Lind, WA- Eastern WA
I don't recall if you stated before, has the engine been rebuilt with hardened valve seats? If not it could be a sticking valve. You might try some Marvel Mystry Oil or Seafoam. It could be a weak or broken spring, You'll need to open the valve cover and look. Worst case- Maybe time for a valve job.
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Junior User
Joined: Feb 2018
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I don't recall if you stated before, has the engine been rebuilt with hardened valve seats? If not it could be a sticking valve. You might try some Marvel Mystry Oil or Seafoam. It could be a weak or broken spring, You'll need to open the valve cover and look. Worst case- Maybe time for a valve job.
Logistics Pro
Joined: Aug 2015
Posts: 4,093
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From: Lind, WA- Eastern WA
Sorry, I was thinking it was an FE engine. Don't worry about needing hard valve seats in a 302. But it still could be a bad spring or a rocker arm retaining nut has loosen some. The last 302 that I owned had nylock nuts on the rocker arms. I had to replace them if I messed with them, because the would loosen up after a day or two. But I could have use Locktite if I had thought of it. But I was only 17 back then.
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Posting Guru
Joined: Mar 2016
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From: Barre Mass
Lifter noise is a ticking sound. Anything deeper in the engine,(piston slap, rod bearings, etc.) is a much deeper rapping sound.
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Fleet Mechanic
Joined: Oct 2005
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From: Gainesville, GA
Did you give a shock treatment with the Seafoam or added it to the gas? It'll loosen the carbon in the heads and pistons and hopefully blow it out the exhaust before it fouls the plugs.
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