dodge 4.7 liter V8

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Originally Posted By: artificialist
Does the 2005 3.7 has the same design flaws as your 4.7? I'd like to know because I'm working to make my mom's car last as long as possible.


I'm not sure. The motors are exactly the same minus the two cylinders. I know in 03 or 04 they re-did the pcv system. I wouldn't work too much about it on the new 3.7 and 4.7's
 
Originally Posted By: sparkplug
Originally Posted By: artificialist
Does the 2005 3.7 has the same design flaws as your 4.7? I'd like to know because I'm working to make my mom's car last as long as possible.


I'm not sure. The motors are exactly the same minus the two cylinders. I know in 03 or 04 they re-did the pcv system. I wouldn't work too much about it on the new 3.7 and 4.7's

Thanks, I needed that info.
 
Originally Posted By: artificialist
Does the 2005 3.7 has the same design flaws as your 4.7? I'd like to know because I'm working to make my mom's car last as long as possible.


No these engines are not affected. Sleep Easy!
grin2.gif
 
I took my 20,000 mile 2005 Dodge truck with 4.7L to the dealer for a cold knock that lasted for minutes (colder it was, longer it lasted) after start-up, ACE mechanic told me it was due to my purolator filter. I said OK ACE it sounds just like the cold piston slap that I lived with on my '96 GMC for 150,000 miles. I just wanted it on record while in warranty, that way if it scattered out of warranty, I may have a chance for some coverage. I've never had a filter related start up knock last much longer than a few seconds, usually no worse than a dry filter start-up after an oil change.
 
moe in wichita ks
to:sparkplug i have a 2001 dak with a 3.9 v6. does my engine have the same trouble as the engines you say have a pcv trouble? thanks.
 
Not reported problems although I have seen a few that have buildup in the engine using a dino oil with the recommended change interval. I would stick to 5K maximum with a synthetic or 3K with a dino for that engine. IMO.
 
grease monkey, have you found the winning oil/ filter combo for your noisy 4.7???

my 3.7 does the same thing.
 
Originally Posted By: wjli
grease monkey, have you found the winning oil/ filter combo for your noisy 4.7???

my 3.7 does the same thing.
not yet still working on it, penzzoil yb has quieted it down some, at my next oci i will use a napa gold (wix ) filter as well as yb. i will keep you posted
 
Concerning blaming filters for the noises in any engine, is it the fact of the flow rate of the media in the filter that causes the fluctuations in noise or is it the anti-drainback valve function.

I could understand if the media is to blame, but as for the chrysler 3.7 and 4.7, the filter is angled in such a way that it wont drain all of the oil out despite what kind of valve it has.

I recall my silverado 4.8 had the filter straight up and down. there is no way the oil drained out of it, but it rattled all the time, hot or cold. (except with vav.durablend 5/20= quiet quiet ??why i dont know, always use supertech or puralator filters??)


I will hopefully get some of the 5/20 val. DB for my 3.7 but the havoline DS 5/20 is working well for me. A few "ticks" first thing in the morning when cold, but quiet the rest of the time.

grab some of the 5/20 durablend grease monkey and see if it is a miricle worker for you.
 
Originally Posted By: sparkplug
Yeah, the PCV system is horrible It has GREAT vacuum but the valve is stupid. I'm in the process of modifying a GM SBC PCV valve to fit in the stock location.
I'm following this thread since I've got some piston slap on my '05 4.7L Grand Cherokee. Seems to be only one cylinder too. A noticeable slap for about 30 seconds when started from dead cold, and also a knock that sounds like it's coming from the bottom end almost like a main bearing knock, but it's temperature related. The hotter the engine is, the quieter this noise is.

Back to your topic, Chrysler did redesign the PCV system for the '06 model year, and older 4.7s can be retrofitted to the new style.
http://wkjeeps.com/tsb/tsb_wk_2500208.pdf
 
My 02 Ram 4.7 did this. I never worried about it much, just chalked it down to piston slap. Traded it off after it blew a head gasket at around 180,000 miles.
 
Originally Posted By: GT Mike
Originally Posted By: sparkplug
Yeah, the PCV system is horrible It has GREAT vacuum but the valve is stupid. I'm in the process of modifying a GM SBC PCV valve to fit in the stock location.
I'm following this thread since I've got some piston slap on my '05 4.7L Grand Cherokee. Seems to be only one cylinder too. A noticeable slap for about 30 seconds when started from dead cold, and also a knock that sounds like it's coming from the bottom end almost like a main bearing knock, but it's temperature related. The hotter the engine is, the quieter this noise is.

Back to your topic, Chrysler did redesign the PCV system for the '06 model year, and older 4.7s can be retrofitted to the new style.
http://wkjeeps.com/tsb/tsb_wk_2500208.pdf


My hemi makes the same noise at start up,and it had 270ish kms on it. So I wouldn't worry much. My truck has has dealer bulk 5w-20 from dodge changed every 5000kms,so longevity on thin oil is no longer a big question in my mind.
However summer is coming and I will be only driving the truck to tow so I'm going up a grade.
Just saying
 
Try a Mopar (factory) filter and PYB 5w30. I had 3 of those engines and never one issue. But I did all 3-4000 mile OCI's and my dealer used bulk Pennzoil. If you don't have a OE filter try a Fram orange can. I used those as well. Never a knock.

Now that I think about it...I have owned 5 Mopar engines and never had one issue with any of them. Too bad I can't say he same about GM, Mazda or Nissan.
 
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I'm running a Wix filter (normally I use Mopar, but I was out of stock, so I had to run to the store and get one that I felt was of decent quality) and (German) Castrol Edge 0W30.

I'm a firm believer in synthetics, just because I put on so many miles I don't want to be changing my oil every few weeks. I'm running a 7500 mile OCI on the aforementioned combo.

What's weird is at 86k, it seems to be getting just slightly better. When I first got the Jeep with ~70k, it was just nasty in the morning. A sharp metallic knocking that lasted for several miles. Now it's still audible, but much less and goes away quicker.
 
Originally Posted By: GT Mike
What's weird is at 86k, it seems to be getting just slightly better. When I first got the Jeep with ~70k, it was just nasty in the morning. A sharp metallic knocking that lasted for several miles. Now it's still audible, but much less and goes away quicker.


That was the cam lobes banging away...now that they are worn down to nubs they are much quieter....
13.gif
j/k
 
Carbon knock is a possibility, but since it seems to dissipate as the temperature increases, that might not be the most plausible explanation.

I shudder at doing a top engine cleaning on an engine with an inverted long-runner plenum such as this engine has due to the fact that any liquid could puddle up in the bottom and get suddenly get sucked into one cylinder. I'd rather live with a little knock than hydraulic a cylinder. Unless someone has a fool-proof method, I'd be interested in listening...
 
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