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Tick under valve cover

Old 11-07-2015, 05:32 PM
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Default Tick under valve cover

I understand that this is likely a 5th valve issue. V8 5.2 l engone, tick is coming from valve closest to radiator on passenger side. No tick, did oil change 10w-40 new oil then tick started after warmed up and drove.

Q: could this be due to the oil viscosity or lack of? I did use a motor flush and removed filter when changing oil.

I'm prepared to replace the lifer or rod if needed. Any info or links would help, advice as to whether I can run engine with valve cover off to locate which valve rocker assembly is failing.
Thanks.
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Old 11-08-2015, 10:29 AM
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You sure it's not an exhaust leak at the manifold?
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Old 11-08-2015, 10:34 AM
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Sticky lifter? Old gunky engine perhaps? Oil viscosity shouldn't be any issue.

I'll second the exhaust leak because sticky lifter is more of a tap.
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Old 11-08-2015, 01:57 PM
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Im not seeing any smoke from the engine area whatsoever. And I put my head near that valve cover and it's definately coming from that side of the engine. It's a tap for sure. Consistent with the firing at idle.
Sounds like a single rod or lifter because it come and goes with the engines firing order.
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Old 11-08-2015, 02:28 PM
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You typically won't see smoke from the exhaust leak.
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Old 11-09-2015, 06:27 AM
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If you feel brave, put on a mechanic's glove and feel around the exhaust manifold for a sharp hot blast of gasses when it fires.
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Old 11-09-2015, 06:37 AM
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Originally Posted by Derkis1989 View Post
I did use a motor flush.

Makes me wonder if a chunk of junk came loose and lodged in a lifter port blocking oil flow to that lifter? May have to do this again.
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Old 11-18-2015, 07:56 AM
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Checked the exhaust, nothing to report there.
An update however: the tick or ping has ceased except on startup for a mere secound before the oil pressure raises and then it goes away. Now I have experienced the same noise after the oil pressure drops to zero which happens if I exceed 70 mph or long period of driving, all of a sudden the oil pressure will drop and then the sound returns. I'm wondering why the oil pressure is dropping?
Any knowledge or reasoning?
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Old 11-18-2015, 10:53 AM
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If the engine is all sludged up inside it will take longer for the oil to return to the sump.
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