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  #1  
Old 02-21-2011, 10:24 PM
kevinph kevinph is offline
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Default Timing Chain Slack 4.7L

I am diagnosing a load clacking noise from the right (passenger side) of the head. Local mechanic and I thought it might be a bad tensioner.

I took of the right valve cover and there is a lot of slack between the chain and the chain guide at the top of cam gear. Almost a full tooth worth. The chain is tight against the tensioner arm on the bottom of the cam gear.

Could the chain have slipped a tooth? Should there be any slack at the top of the cam gear?

Any help is appreciated. I am comfortable with working on engines, but have never worked on an overhead cam engine.

Note: Mechanic thought the engine might be "sludged up" - no sludge present except in filler spout.
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Old 02-21-2011, 11:14 PM
mark1963 mark1963 is offline
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Default engine sludge

i am no mechanic by far, so i can't help with your chain tensioner but i thought the same thing about the engine oil sludging at the filler spout, if you seen no sludge when you removed you valve cover yuo are good being that is where your engine sludge would start,,

good luck on the chain,!!
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Old 02-22-2011, 12:13 AM
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this is what happened to mine
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Old 02-23-2011, 07:42 AM
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Any mechanics out there who can help with diagnosing the slack in this timing chain? I can upload pictures if it will help.
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Old 02-23-2011, 10:53 AM
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If the timing were off, you'd likely have bent intake valves since these engine have little tolerance for timing errors. A clacking noise makes me think a lash adjuster or rocker problem since loose tensioners tend to make a high speed rattle that sounds almost like a buzz. The chain can have some slack with the engine off because the tensioners are hydraulic.
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Old 02-23-2011, 07:43 PM
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I have the valve cover off. Any problem with oiling if I run it with the valve cover off to see if the chain tightens up?

I am concerned because the slack is on the upper part of the chain (against the guide) not on the bottom of the chain next to the tensioner.
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Old 02-26-2011, 10:51 AM
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I ran the engine with the vlve cover off. Tensioner firmed up the chain fine. Looks like it is oiling okay at each cam lobe. There is still an ungodly clacking sound.

With the valve cover on the sound is definitely loudest at the very front of the cover. With the cover off it is hard to isolate the sound to any specific cam component.

How can I test/check lash adjusters or rockers?

thanks
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Old 02-26-2011, 10:59 AM
Thetolleyman Thetolleyman is offline
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Its a lot of work, but taking off the front timing cover will let you look at all of the timing components. Like the poster above, I had two broken chain guides, the plastic was cracked, the aluminum was fine. The dealer had one in stock, Advance had the other.
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Old 02-26-2011, 11:02 AM
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One other thing; to check for correct chain position rotate the engine until the pink dots on the chain align with the circle or dot on the cam sprocket. When they do they should be facing straight up. If the chain had jumped a tooth, all of this would never line up. The manual explains this in detail, if what I'm saying is confusing.
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Old 02-26-2011, 11:03 AM
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Clacking makes me think it's a lash adjuster. I've never seen a rocker go bad but it certainly could happen. When we get a lash adjuster problem, we replace them all just to be on the safe side.
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