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1st Gen Dakota '96 & Older Dakota's

tapping noise sounds like timing chain slap?????

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Old 11-21-2007, 04:54 PM
partsman31523 partsman31523 is offline
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Default tapping noise sounds like timing chain slap?????

I cannot for the life of me figure out this stinking tapping noise coming from the lower front part of my engine. It's been going on for the last 6 months or so and I've replaced parts left and right withot removing my tiing cover to do some investigating. The only thing I haven't replaced yet is my harmonic balancer, alternator and p/s pump. Everything else is brand new to include an electric fan conversion. I just got the fax from Lou at my local Dodge dealership and there appears to be NO TIMING CHAIN TENSIONER!!! I'm used to working on fords so I've never seen this before. In fords there are tensioners and guides for the timing chains. I'm lost and don't know where to go from here so ANY help at all would be so greatly appreciated. I'm hoping someone out there has ran into this before and corrected whatever was wrong. I'll keep my fingers crossed!
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1996 reg cab,2wd, 3.9L, 5 speed
Dual exhaust from the glasspack back with SS tips
High flow cat, 5.2L tb, open air holley air cleaner, k&n filter, electric fan, 3 panel hard folding tonneau cover all at 20.14 MPG as of 12-3-07! finally broke 20!
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Old 11-21-2007, 07:26 PM
Nicegy525 Nicegy525 is offline
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Default RE: tapping noise sounds like timing chain slap?????

could it be a stuck lifter? Lower end rod knock? Lots of possibilities with tapping noises. turn the fan blades, are they hitting anything? get a stethoscope and pinpoint where the noise is coming from.
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Old 11-21-2007, 09:28 PM
Sixtysixdeuce Sixtysixdeuce is offline
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Default RE: tapping noise sounds like timing chain slap?????

Quote:
I just got the fax from Lou at my local Dodge dealership and there appears to be NO TIMING CHAIN TENSIONER!!! I'm used to working on fords so I've never seen this before. In fords there are tensioners and guides for the timing chains
I'm not aware of any pushrod V6/V8 with tensioners. All the old Ford 289,302,351(W,M,C), 390,400,428 & 460 are standard chains just like Mopar and GM SB & BB engines. Don't need tensioners and guides when the crank and cam sprockets are only an inch apart. The Ford SOHC engines use all kinds of guides, which come apart regularly.

Anyway, yes, sloppy timing chains causing noise on 3.9's is a very common problem. Newtiming setand timing cover gasket set should run ~$80 from Napa. Mightconsider a double roller (Napa P/N: 201103) for another $25. And I'd go ahead and replace the W/P & bypass hose while you're in there;gotta come off anyway.
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Old 11-21-2007, 09:42 PM
partsman31523 partsman31523 is offline
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Default RE: tapping noise sounds like timing chain slap?????

Yeah I ALWAYS sold the guides and tensioners when I worked for ford... and it was always on the explorers with the 4.0L SOHC engine!!

I've already replaced the W/P and bypass tube recently. I was hoping I wouldn't have to back into it all. It's not very time consuming which is good but I promised myself that I'd replace my harmonic balancer next time I put a ratchet to the truck so I'll prepare for doing the timing set on Sunday! I appreciate the feedback guys. I know for a fact that it's a light tapping and not rod knock and it's coming from the lower front of my engine near the front of my crankshaft so I would venture to say that it's not a stuck lifter nicegy525but I appreciate your help too!

I'll do it NEXT sunday and post the results from the repair! We're gonna go visit family for Turkeyday!!!
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1996 reg cab,2wd, 3.9L, 5 speed
Dual exhaust from the glasspack back with SS tips
High flow cat, 5.2L tb, open air holley air cleaner, k&n filter, electric fan, 3 panel hard folding tonneau cover all at 20.14 MPG as of 12-3-07! finally broke 20!
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Old 11-21-2007, 09:43 PM
partsman31523 partsman31523 is offline
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Default RE: tapping noise sounds like timing chain slap?????

By the way...

HAPPY THANKSGIVING!!
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1996 reg cab,2wd, 3.9L, 5 speed
Dual exhaust from the glasspack back with SS tips
High flow cat, 5.2L tb, open air holley air cleaner, k&n filter, electric fan, 3 panel hard folding tonneau cover all at 20.14 MPG as of 12-3-07! finally broke 20!
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Old 11-23-2007, 11:51 AM
hemichuck hemichuck is offline
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Default RE: tapping noise sounds like timing chain slap?????

I've seen the mopars run with a slapping chain till it wore all the way through the cover.If its slapping thats what your looking at.I added a tensioner on my 5.9 when I rebuilt it.They are not very expensive and bolt on in place of the cam plate.
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Old 11-23-2007, 01:32 PM
partsman31523 partsman31523 is offline
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Default RE: tapping noise sounds like timing chain slap?????

where'd you get the "universal???" tensioner??? So far Autozone, Advane nor Oreilleys has got a listing for one!
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1996 reg cab,2wd, 3.9L, 5 speed
Dual exhaust from the glasspack back with SS tips
High flow cat, 5.2L tb, open air holley air cleaner, k&n filter, electric fan, 3 panel hard folding tonneau cover all at 20.14 MPG as of 12-3-07! finally broke 20!
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Old 11-23-2007, 02:06 PM
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Crazy4x4RT Crazy4x4RT is offline
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Default RE: tapping noise sounds like timing chain slap?????

It might also be a berring inside the engine too thats what happend to me.
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Old 11-23-2007, 02:16 PM
Dakota 420 Dakota 420 is offline
 
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Default RE: tapping noise sounds like timing chain slap?????

I think I have the same problem with my 94 3.9 it was just rebuilt last year with less than 40000kms on it since.
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Old 11-23-2007, 02:16 PM
 
 
 
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