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SuperNewbie
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2,869 Posts
Discussion Starter #1
Has anyone had to replace the timing chains and/or tensioners in your 4.6? I'm curious to see what symptons anyone has experienced.
Thanks!
 

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Registered
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2,639 Posts
Im now running 140k on factory chains and gears with stage 2 cams(for 3 years now). Everything is still doing good.
 

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5,417 Posts
on one of the mustangs I did a PI swap on we had to replace the chains and guides, chains had a lot of play in them when they were off of the engine, and before we did the swap it was making a griding sound behind the timing cover, the guides were down to bare metal, so how one of the guide bolts was missing, probably what caused the excessive wear
 

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Fry Rice Specialist
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4,794 Posts
mind stock npi at tear down at 196k miles only shows minimal wear on the chain guide.
 

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1,522 Posts
Only need to replace the chains if the guides are worn to metal IMHO. I always replace the curved guide and always use the cast iron tensioners.
 

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Banned
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998 Posts
I had to replace the passenger side tensioner after doing the PI cam swap it did not pump up, had to take the hole thing apart again to....crap.....
 

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Premium Member
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9,165 Posts
Never heard of a set going bad... Unless as has been mentioned something else fails and causes it. I had to replace a set of heads on mine (long story) but still use the original tensioners, guides, and chains. they showed little if any wear.
 

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Super Moderator
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7,565 Posts
278K on my crown vic, and the timing cover has never been off the motor.
 
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