Re: 4.7 issues
[Re: dodgeram440]
#2399762
11/07/17 01:35 AM
11/07/17 01:35 AM
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Joined: Jan 2003
Posts: 7,477 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,477
Minnesota
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They make than with a Hemi, right? I had a Ram 1500 with a 4.7, and a bunch on them with Hemis. The hemi gets much better mileage, and the 4.7 is so under powered. I'd recommend skip that 4.7 and find one with the hemi.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: 4.7 issues
[Re: dodgeram440]
#2399802
11/07/17 02:54 AM
11/07/17 02:54 AM
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Joined: Nov 2011
Posts: 653 montana
pjc360
mopar
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mopar
Joined: Nov 2011
Posts: 653
montana
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So I asked about this over on the truck section and got some peekers but not much help. I’m looking at buying a 2007 Chrysler Aspen (Dodge Durango) with a 4.7 with 123,000 miles. I’ve been out of the game for a while but I seem to remember something about the 4.7’s having oiling system problems. Is this true? What exactly were the problems? What steps can I take on a used truck to guard against possible problems? Thanks for any help. I bought a 2001 durango with the 4.7 and it had 148k when I bought it. Now it has 170k on it haven’t had any issues with it at all. Just run synthetic oil in it and a good filter and change the oil every 5-7k miles. That’s what I’ve been doing with mine and it’s been flawless. The fuel mileage could be better, specially with a smaller v-8 I get about 12 city and about 18-20 highway depending on how fast I’m going. I’ve noticed my 4.7 is very picky on the air filter, I change the air filter about once every six months cause mileage will start to fall off after about 6 months on a paper air filter.
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Re: 4.7 issues
[Re: dodgeram440]
#2399922
11/07/17 01:26 PM
11/07/17 01:26 PM
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Joined: Feb 2003
Posts: 1,306 Laveen, Arizona
GTSDart340
pro stock
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pro stock
Joined: Feb 2003
Posts: 1,306
Laveen, Arizona
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I had an 01 Durango with the 4.7, we bought it with 170k miles. used about 4 quarts of oil in 1000 miles. It was very under powered, but ran as smooth as could be. I think it also cracked a cylinder head as well. We got rid of it with 195k miles.
1949 International KB-2 "Mater" - 302/T5
1968 Dodge Dart GTS "The Drat" - 340/727
2006 Dodge Magnum R/T - Hemi
2016 Dodge Durango Limited - 3.6
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Re: 4.7 issues
[Re: dodgeram440]
#2400000
11/07/17 04:12 PM
11/07/17 04:12 PM
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Joined: Jan 2003
Posts: 8,392 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,392
Highland, MI.
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I had a 2008 Ram with the 4.7L & loved it. Plenty of power & very dependable. That was from new however & never had any problems. Traded it in with about 19,000 miles.
No Man With A Good Car Needs To Be Justified
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Re: 4.7 issues
[Re: dodgeram440]
#2400453
11/08/17 01:16 PM
11/08/17 01:16 PM
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Joined: Nov 2011
Posts: 653 montana
pjc360
mopar
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mopar
Joined: Nov 2011
Posts: 653
montana
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I wish it had the hemi, but it don’t so this is what I may be getting. And after a test drive, it certainly doesn’t seem underpowered to me. Got plenty of get up and go. And the only thing it will likely ever haul is groceries and grandkids so I’m not really worried about towing abilities. This truck is in really nice condition and looks like it’s been well taken care of, but I have no way of knowing the maintenance history on it and if they did regular oil changes or not, or what kind of oil may have been used. I was basically just wondering if there was anything that could be done from this point forward to help prolong the life. I figured a synthetic oil would be a good start, but wasn’t sure if there was some kind of cleaner I should try first or if that would be advisable. I tend to stay away from cleaners, but the one cleaner I’ve had good success with in the oil pan and in the fuel tank is marvel mystery oil. Put in a qt of marvel mystery oil and drive it for about 200-300 miles to let it soak in and clean thins up then drain the oil and re-fill with a synthetic and a good filter and put a good paper air filter in it at that time as well and I bet you’ll be fine and not have any issues. Just change the oil every 5-7k with a good filter. The 4.7 in my Durango has been a very good engine so far. It’s a little noisy when it’s cold but I’ve been told it’s the valve lash adjusters making noise cause when it gets warm it’s quiet and it’s always been a smooth running engine as well.
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Re: 4.7 issues
[Re: dodgeram440]
#2400499
11/08/17 02:30 PM
11/08/17 02:30 PM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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http://www.enginebuildermag.com/2012/01/valve-seat-selection-finishing-materials/Sample quote Chrysler has reportedly had problems with the exhaust valve seats loosening up and dropping out in some of its late model 4.7L engines. Seat failures have typically occurred between 60,000 and 80,000 miles, often after an overheating episode in which the coolant got above 250 degrees F. Some engine builders say Chrysler didn’t use enough interference fit for the seats in these engines and recommend using an additional .002" of interference when the seats are replaced. Cutting the seat recess slightly deeper can also improve seat retention. Some vehicle manufacturers use only a couple thousandths of interference when they install valve seats in a new cylinder head. They can get by with minimal interference because the heads are brand new castings that have been freshly and accurately machined. There’s been no wear, corrosion or motion to loosen up or distort the valve seat recess as is often the case with high mileage cylinder heads. End quote
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Re: 4.7 issues
[Re: dodgeram440]
#2400501
11/08/17 02:32 PM
11/08/17 02:32 PM
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Joined: May 2003
Posts: 3,042 N.W. Florida
Fat_Mike
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master
Joined: May 2003
Posts: 3,042
N.W. Florida
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The big "take away" I get from all of the 4.7 conversation I've read is this: All engines will require replacement at some point. The 4.7 is very expensive to replace and not easy to find. Thus, the vehicle becomes virtually a "throw away" vehicle when (not if) the motor gives up.
Last edited by Fat_Mike; 11/08/17 02:33 PM.
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Re: 4.7 issues
[Re: dodgeram440]
#2400522
11/08/17 03:14 PM
11/08/17 03:14 PM
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Joined: Dec 2007
Posts: 1,357 central Florida
VL21
pro stock
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pro stock
Joined: Dec 2007
Posts: 1,357
central Florida
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I met a guy a few years ago, worked as a mechanic for a buy here, pay here lot. They bought a lot of repos, high milers, etc at the auction because they were cheaper ...
He was complaining about the 4.7 he was currently working on, which conversation developed into a sort of rant on all 4.7s.
The current one he was working on had warped the head so badly he couldn't get the cam out of it.
Seems they have a lot of top end, head gasket, cam followers issues.
My buddy the Dodge dealer says he has no problems with them, but one of the things he makes sure to do with a used one is change/flush the coolant, factory fill stuff gets toxic.
As with any aluminum head (IMHO) overheating is a definite no no.
Member Hotrod Dave has a lot of insight on these.
Oh yeah, they have a reputation for building sludge in the oil drain back areas.
Last edited by VL21; 11/08/17 03:16 PM.
It takes gasoline to interest me.
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Re: 4.7 issues
[Re: 360view]
#2403765
11/14/17 11:39 PM
11/14/17 11:39 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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http://www.enginebuildermag.com/2012/01/valve-seat-selection-finishing-materials/Sample quote Chrysler has reportedly had problems with the exhaust valve seats loosening up and dropping out in some of its late model 4.7L engines. Seat failures have typically occurred between 60,000 and 80,000 miles, often after an overheating episode in which the coolant got above 250 degrees F. Some engine builders say Chrysler didn’t use enough interference fit for the seats in these engines and recommend using an additional .002" of interference when the seats are replaced. Cutting the seat recess slightly deeper can also improve seat retention. Some vehicle manufacturers use only a couple thousandths of interference when they install valve seats in a new cylinder head. They can get by with minimal interference because the heads are brand new castings that have been freshly and accurately machined. There’s been no wear, corrosion or motion to loosen up or distort the valve seat recess as is often the case with high mileage cylinder heads. End quote This is right as I had a few drop valve seats in them. Many would come in with a rocker arm that fell off and laying in the head because the seat dropped and held the valve from closing all the way and the clearance let the rocker fall out. I also saw many that ran good for a long time but I would say our dealer would see a dropped valve seat maybe every 6 months as I know I did about 4 of them over a 2 year period one time. The other thing about them is they are overhead cam and they have a few timing chains on them going to each head and one to a dummy shaft where the in block cam would normally be. It has a gear on that shaft that makes it look like it has a cam in the block until you remember its overhead cams. But I know without the special tool to hold the chains in place on that gear on the dummy shaft its hard to do the chains on them. The tool holds the chains in place on that gear while you put the chains on. My point is it will cost alot more then a timing chain job would on say a 318 magnum eng would. But I would want to look at the oil and coolant and drive the truck hard before I would consider buying it. If it looks to have been maintained right and runs fine then if the price is right I would buy it. But I can also do my own repairs if I had one and something did break. Good luck with it , Ron
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