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  #1  
Old 11-17-2010, 08:21 AM
wintermute wintermute is offline
'03 Edge 4x4
 
Join Date: Sep 2010
Posts: 242
Default SOHC Timing Chain Rattle -> Catastrophic Failure?

I believe my '03 Edge with all of 49,500 miles has the SOHC Timing Chain Rattle Heard during freeway acceleration 2600-3000+ rpm run to 60 when the engine is still on the cool end of the scale. Backing out of the throttle to a slower acceleration quiets things down immediately.

This brings up the question: If left unchecked, will this eventually result in a catastrophic engine failure? – Will there eventually be enough slack in the chain to start skipping teeth on the sprockets to the point that valves start hitting pistons?

Or is this just an annoying noise issue that can be somewhat mitigated by higher quality oil?
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Last edited by wintermute; 11-17-2010 at 11:09 PM. Reason: Refined RPM range after further driving
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  #2  
Old 11-17-2010, 08:27 AM
Clinton Clinton is offline
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Default Re: SOHC Timing Chain Rattle -> Catastrophic Failure?

I was told recently if it starts to go then finally goes you're screwed. Get it looked at right away. I'd hate to see that go on such a nice truck man. Do you have anytype of extended warranty? If not look into it and maybe it will be cheaper than paying for a ton of work
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  #3  
Old 11-17-2010, 08:30 AM
edgeman4.0 edgeman4.0 is offline
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Default Re: SOHC Timing Chain Rattle -> Catastrophic Failure?

you'll be fine, what actually happens is the guides break and it allows the chain to "flap" around a little more and make some noise.. long term issues? none as of yet.. it all depends on how long you can handle the sound.

mine's been at it for the last 5k miles.
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  #4  
Old 11-17-2010, 09:28 PM
wintermute wintermute is offline
'03 Edge 4x4
 
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Posts: 242
Default Re: SOHC Timing Chain Rattle -> Catastrophic Failure?

No extended warranty, I'm the 3rd owner and I just might be crazy enough to tackle this on my own as long as it's just replacing guides and tensioners. That in itself seems fairly straightforward. I can't imagine the chains or sprockets being in any need of replacement at this low mileage.

A guy on explorerforum did the rear chain by dropping the transmission and pulling the flywheel…which is good to know because I don't have the space to pull the engine.
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  #5  
Old 11-18-2010, 04:30 AM
mcpink mcpink is offline
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Default Re: SOHC Timing Chain Rattle -> Catastrophic Failure?

Mine does it as well. Been doing it for a while now. Very common on these 4.0s from what I hear.
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