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  #25  
Old 01-24-2013, 06:03 AM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

The radiator cap has a bit too high pressure compared to the standard 18 PSi cap.
What do you mean with " the occasional line to blow off" ?
The pressure inside the cooling system should be quite high and the hoses become rock hard, so did you measure the pressure to know that it is too high?
Do you see any air bubbles in the overflow reservoir with the engine running, pointing towards a leaking head gasket?
You should not remove any coolant, it will expand and the radiator cap internal relief valve should open and the coolant should go into the overflow reservoir.
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  #26  
Old 01-24-2013, 08:19 AM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

If you don' t see any air bubbles in the overflow reservoir, i would change the radiator cap for the standard 18 PSI one and also change the thermostat. It could be that the thermostat doesn' t open completely, still giving enough cooling capacity when driving, but lacking when standing still and needing full cooing capacity.
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  #27  
Old 01-29-2013, 08:46 PM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

I really do not think it's the Thermostat though I will give that a try when I get a chance. At this point it's starting to run bad/rough and it makes a good bit of white antifreeze smelling smoke but not all the time. I do not think I see any air bubbles.

I'm thinking after I try the Thermostat that may be as far as I go with this Jeep. I spoke with a guy at the Jeep Service department about rebuilding the engine and he advised against it. He said when I got finished I would have a new engine and that it would be a lot easier to replace the engine than deal with fixing this one. He said as I get one thing on it fixed something else would break and so on. I told him at that point I would have more in the vehicle than it's worth and he agreed. He said I would be better off to get another vehicle at this point. He said any of these that have more than 150,000 miles on them run very fastly away from.

If I could spend a thousand bucks on it and be good for years to come I would but I think I have squeezed all out of this engine that is left. Perhaps you guys know where a deal could be had on a re-maned engine though the guy at the Jeep place said if it ran hot plan on replacing the transmission too. Not sure which way to go from here. I like the Jeep, it's perfect for me, I like the way it looks (except for the peeling clear coat ), if I had enough money and could fix it right I would be happy to do so I'm just not sure I can get there from here.

To the PSI in the radiator, the guy at the parts center says 20 PSI. That being said if I go down in pressure that is going to cause it to run hot more often/sooner. That will not address any of my current issues so why spend the money. I currently am not driving it as I cannot. I'm driving a loner from a friend right now.

Lastly I am veryy frustrated. This whole economic downturn has really sucked for me. I used to have a little more economic freedom than I do now. From what I am seeing on the internet it appears there is no end to the folks that have these that run hot. I believe we have some design issues here.
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  #28  
Old 01-29-2013, 10:08 PM
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I have had very god luck just doing head gaskets, yes there can be other issues that come up but nit issues to justify a new motor. My 4.7l WK has almost 200k on the clock, I got it needing head gaskets really bad at 165, just over 30k moose since the repair and it still runs lije a top. No need to replace the trans either...

If your just going to believe what some service advisor told you sight unseen then I'll give you 300 dollars for your rig, tow it home, replace the head gaskets and make a grand or 2 selling it. Get a second diagnosed opinion and tell them your not looking to secure its operation for the next 30 years, you just need it to run right now.

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  #29  
Old 01-29-2013, 10:49 PM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

Not saying what the guy said was the gospel just stating what he said. If I tear this thing down it will also need the timing chain cover replaced as it needs replacing. The cover alone is $400.00. While I'm in there might as well replace the timing chain and gears. My concern would be going that far and it not be enough. I have had all kinds of suggestions such as new head gaskets and sell it quickly. Not sure new head gaskets would be a long lasting fix though, yes it might be a short term problem solver only to relive this all over a little further down the road. Of coarse there are not many guarantees in life in general. I want to make the smart move here. I would absolutely love to get this thing fixed good and right. I may not have the means to make all that happen. I have a grand I could spend on it or sell it for $1500.00 and take the $2500.00 and go in another direction. I have a friend offer me a deal in a Suburban with new engine, tranny, and tires but man it has got to be one gas hog because it is huge.

Thanks to everyone for the advice. I suppose I need some time to stew on this before deciding which direction to go.
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  #30  
Old 01-30-2013, 07:57 PM
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I rebuilt my 4.7 in.my parents garage i have a few posts on here and maybe pictures, i had the heads serviced and left timing chain Ect.... alone as its a chain and not much to worry about unlike belts. And i spent about $1500 all together but of course new parts included. Most expensive was the heads coming in at $600.
Go onto Craigslist or junk yards and buy covers and such items for a fractions, i was ready to chuck my wj but figured putting in some $$ and i wont be dealing with.payments for 2-5yrs. Its a simple motor to work on. Time consuming and frustrating but its not open heart surgery. Buy a chilton or Haynes or download a dealer manual from one of.the guys here and be set.
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  #31  
Old 02-02-2013, 02:46 PM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

I'm toying with the idea of fixing it. As I said I would need the timing chain cover as it is corroded out and probably does not cool well because of it. At that point I cannot see not replacing the timing chain and gear with the miles on this engine. Then rebuilding the heads. Do you guys think I could get through this for a grand?

Rebuild heads and head gaskets.
Replace timing Cover.
Replace timing chain and gear.

It would be nice if I could get someone else to do it for that price?

Is the intake on these 4.7's plastic or metal?

My concern would be if I did all that with 183,000 miles on the engine and the fact that it ran hot is how long would the engine last me after all that?
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  #32  
Old 02-02-2013, 03:16 PM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

I found this on the net. My friend the mechanic says get rid of it the engine walls are too thin.



Engine Failure

  • Engine failure can occur after 70,000 miles due to poor or lack of maintenance. But engine failure also has been known to be caused in some 4.7-liter engines with abnormally thin engine block walls on some engines. The thin walls cause excessive heat, which over time will cause oil to become gummy and the heads to crack. Only strictly following the factory recommended maintenance schedule can minimize the exposure to engine failure and ensure the warranty will be honored.


Exceptions

  • Although engine failure in the Dodge 4.7-liter V-8s haven't reached significant proportions, carcomplaints.com reports that owners have complained of sudden loss of oil pressure with as little as 36,000 miles on the engine. Internal examination of the engine has found oil sludge to be present, although diagnostic checks fail to pinpoint the source of the failure.


Oil Sludge

  • Oil sludge appears to be a common problem with the 4.7 engine. It has been known to build up in no matter what the weight of the motor oil. Oil sludge is usually due to a faulty positive crankcase ventilation, or PCV, valve. Changing the PCV and switching to high-mileage oil will probably solve the problem, according to bobistheoilguy.com.


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  #33  
Old 02-02-2013, 04:52 PM
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Quote:
Originally Posted by Blue Marvel View Post
I found this on the net. My friend the mechanic says get rid of it the engine walls are too thin.



Engine Failure

  • Engine failure can occur after 70,000 miles due to poor or lack of maintenance. But engine failure also has been known to be caused in some 4.7-liter engines with abnormally thin engine block walls on some engines. The thin walls cause excessive heat, which over time will cause oil to become gummy and the heads to crack. Only strictly following the factory recommended maintenance schedule can minimize the exposure to engine failure and ensure the warranty will be honored.


Exceptions

  • Although engine failure in the Dodge 4.7-liter V-8s haven't reached significant proportions, carcomplaints.com reports that owners have complained of sudden loss of oil pressure with as little as 36,000 miles on the engine. Internal examination of the engine has found oil sludge to be present, although diagnostic checks fail to pinpoint the source of the failure.


Oil Sludge

  • Oil sludge appears to be a common problem with the 4.7 engine. It has been known to build up in no matter what the weight of the motor oil. Oil sludge is usually due to a faulty positive crankcase ventilation, or PCV, valve. Changing the PCV and switching to high-mileage oil will probably solve the problem, according to bobistheoilguy.com.


Please post that link...

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  #34  
Old 02-03-2013, 06:01 PM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

I forget where I found it. I was talking to mechanic friend and he said he Googled the engine itself to find the real scoop on these. It's not a Jeep engine it's a Chrysler engine found in several of their models.

He said stay away from this engine. The Jeep is going to a wayward home for Jeeps now. I am not going to spend any more time on this thing. If you Goggle Chrysler 4.7 engine problems you will find some stuff. It seems I have found no end to the folks that have had overheating with this engine after it gets a little wear on it and becomes less efficient. Also it seems the coolant system is just barely enough to keep the vehicle cool, sized exactly to meet demand of the engine but no extra. If there any problems it over heats.

I say run like hell. I liked my Jeep. I really liked the body style of this year model. I like how it handled, how it felt, how it had plenty of room but not too big. It just didn't like me. Live and learn.
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Old 02-03-2013, 09:14 PM
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I think there are several hundred thousand people that will disagree with your take on the engine...but everyone is entitled to their opinion.

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Old 02-04-2013, 12:10 AM
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Re: Hydraulic Radiator Fan 4.7L Questions Please

he said it overheats AFTER he shuts it off not while running how would that be head related? 20 lb cap? is that standard? water at 20 psi boils at 258 thats damn hot cant believe you havent changed the tstat maybe try a slightly cooler one there cheap enough and wont you be kicking yourself in the arse if it fixes it (rad replacement)


before you jump ship find a guy on here named flyin ryan and send him a message he is the man on these engines dont let some internet bullhockey make you throw in the towel. jeep is chrysler did you not know that? even when it was owned by amc it still was a rambler aka amc engine or gm engines also i believe

pretty sure you could google honda accords and come back with hours worth of reading from people complaining



note when i wrote this i didnt realise there was a third page to the post
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