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Allpar
Dodge Dakota
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1/07/2006
23:57:21
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 Subject: Timing chain 3.9/5.2
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I was just wondering why the 3.9's always have to have their chain replaced and tightened and the 318 being basically the same motor doesnt have to..?
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gen1dak
Dodge Dakota
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1/08/2006
02:16:56
| RE: Timing chain 3.9/5.2
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At some point, they all received tensioners to maintain proper timing for the MPI over a longer lifespan. However, at some point, they all have to be replaced.
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prodak
Dodge Dakota
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1/08/2006
12:24:52
| RE: Timing chain 3.9/5.2
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Message:
I read somewhere (don't remember where) that the 3.9 cam-to-crank center distance is a few millimeters less than the 5.2, so the 3.9 actually starts out with a little slack, thus the need for the tensioner and the more noticeable effects from stretching.
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gen1dak
Dodge Dakota
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1/09/2006
00:13:13
| RE: Timing chain 3.9/5.2
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The later V8's have the tensioner as well and their cams weren't relocated. The tensioner is there to maintain accurate timing for the MPI as the chain stretches over time.
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Dean
Dodge Dakota
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1/11/2006
15:48:31
| RE: Timing chain 3.9/5.2
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Did you guys ever stop to think that maybe it cuz the 3.9 has two less cyl the the 5.2 thus it has to work harder and spin faster to be able to pull your truck around
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prodak
Dodge Dakota
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1/11/2006
23:05:20
| RE: Timing chain 3.9/5.2
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Message:
From a post by Larry (J&J Auto):
"You can and should use the tensioner even with
a double roller chain because it will eventually
rattle also because the cam was lowered .050
closer to the crank on the V6 mags why no one
has the answer."
http://dodgedakotas.com/boards/v6/11514.html
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