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  #1  
Old 01-11-2011, 03:15 PM
Ford Tough
 
Join Date: Dec 2010
Posts: 417
Default timing chain rattle question

which timing chain guide set is the one that goes bad in the sohc 4.0's? I thought I knew this problem inside & out, but I read a bunch more information and now I'm more confused haha.

Ford calls it the 'primary timing chain guide' and fixes it with part number 2U3Z6D256DA.
--Is this the one in the front of the engine..., or is it the rear one that requires engine removal that wears out?
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  #2  
Old 01-11-2011, 11:53 PM
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Default Re: timing chain rattle question

The Primary Timing Chain is the one that links the crank to the jack shaft in the valley of the engine. Both cam chains are driven by this shaft. 4x4's also have a balance shaft along the passenger side of the engine that has its own chain from the crank.

I like the idea of using of the cylinder offset to place the cam chains for a more compact design. It's just really frustrating that something as mundane as chain guides and tensioners causes so much trouble.

I'd really like to run an inspection scope down each chain cassette to check the guide conditions.
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  #3  
Old 01-12-2011, 11:16 AM
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Default Re: timing chain rattle question

Quote:
Originally Posted by wintermute View Post
I'd really like to run an inspection scope down each chain cassette to check the guide conditions.
That's actually a really good idea haha.

so am I correct by going off this diagram that the problem chain guides are in the front? (The chain that goes crankshaft to jackshaft)
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  #4  
Old 01-12-2011, 11:20 AM
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Default Re: timing chain rattle question

I like my 3.0 so much more after seeing that diagram. I'd rather replace a cam sync any day of the week.
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  #5  
Old 01-16-2011, 09:25 AM
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Default Re: timing chain rattle question

4x4's also have a balance shaft along the passenger side of the engine that has its own chain from the crank. What is this balance shafts purpose? And why 4x4 only?Thanks Dennis
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  #6  
Old 01-16-2011, 03:48 PM
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Default Re: timing chain rattle question

Quote:
Originally Posted by cowboykilroy View Post
4x4's also have a balance shaft along the passenger side of the engine that has its own chain from the crank. What is this balance shafts purpose? And why 4x4 only?Thanks Dennis
i believe that the balance shaft is needed because it is a v6. a v8 is naturally balanced with the "throws" of the crank (where the rods bolt onto) being 90 degrees apart, or 4 throws total in one circle. a v6 has to have 3 throws at 120 degrees apart. making the firing order all messed up which causes vibrations.

the balance shaft counteracts the vibrations and eliminates them. why it is only in 4x4s doesnt make sense to me.

now that i think about it, my engine (which is the ohv) vibrates pretty noticeable right at 2750 rpms. i think that it is the harmonics making it do that and the fact that its a v6...

i might be wrong about all this. if i am please correct me
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  #7  
Old 01-18-2011, 04:07 AM
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Default Re: timing chain rattle question

After I asked why on 4x4 only, I kept thinking about it and I now thing It is because in 4low there is a high probability of much higher RPMs than 2wd.Just my opinion.Dennis
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  #8  
Old 02-15-2011, 09:57 PM
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Default Re: timing chain rattle question

Quote:
Originally Posted by Fordzilla80 View Post
I like my 3.0 so much more after seeing that diagram. I'd rather replace a cam sync any day of the week.
x2!! lol and i already did so i'm good
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  #9  
Old 09-08-2011, 10:41 AM
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Default Re: timing chain rattle question

Yes which one wears out?!?!?! I need some help!!!
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  #10  
Old 09-08-2011, 10:44 AM
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Default Re: timing chain rattle question

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Originally Posted by Stringer View Post
Yes which one wears out?!?!?! I need some help!!!
Doesnt really matter, if the engine is out, you should just replace them both
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  #11  
Old 09-08-2011, 10:55 AM
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Default Re: timing chain rattle question

Do I have to take the engine out to replace both? I thought that was only for one of them?
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  #12  
Old 09-08-2011, 08:53 PM
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Default

Yea i heard its most likely the rear one mine is doing the sane thing im not that enthused about it but its something on my priority list lol
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