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2012 Durango RT oil in coolant #2611905
01/25/19 02:25 AM
01/25/19 02:25 AM
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Jambbii Offline OP
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So the wife calls me and tells me her check engine light is on in the Durango but it is still running fine. Pull the codes and it is for the cam position sensor. Grab a sensor and change it out. As I am in there I notice that the coolant is pretty dark. Check the oil and it is not even registering.

I am assuming there is a head gasket leak. Truck has 78k on it and has been maintained by me all its life with no prior issues. Did some google searches and didn't really come up with stock hemis. Has there been any issues with cylinder head castings or even factory gaskets?

I am looking for some advice on what to change while I am in there (this will be my first time tearing into a 3rd Gen Hemi).
Should I buy new cylinder heads or just get them checked? Head studs, valve springs etc? We are planning on keeping the Durango forever and I want a bullet proof package.

Any advice would be appreciated.

Thanks,

Josh


70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2611924
01/25/19 03:30 AM
01/25/19 03:30 AM
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That organic coolant normally looks dark and yucky like somethings wrong. Maybe top up the oil ir change it, flush the coolant and test it for a bit. If they are mixing it will look real bad. Not out of the ordinary for some hemis to use alot of oil

Re: 2012 Durango RT oil in coolant [Re: L4staero] #2612014
01/25/19 12:54 PM
01/25/19 12:54 PM
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Originally Posted By L4staero
That organic coolant normally looks dark and yucky like somethings wrong. Maybe top up the oil ir change it, flush the coolant and test it for a bit. If they are mixing it will look real bad. Not out of the ordinary for some hemis to use alot of oil


It's bad. Just did a Tstat in it a few weeks ago and it was still good. Did an oil change about a month ago as well. There was a fair amount of oil in the intake too. Going to dig into it tonight.


70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2612108
01/25/19 03:54 PM
01/25/19 03:54 PM
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HotRodDave Offline
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I would almost bet it's head gaskets also.

My advice, Get a 6.4 cam and valve springs while your in there and carefully check every lifter, roll it on a clean piece of glass and listen for anything thats not a normal rolling sound and replace the bad ones, even better just buy 16 new ones if you can swing it. Machine the heads to make sure they seal up real good, while they have em tell em to take .020 off, this will give you a smidgen more compression and a tiny bit more lifter pre-load to keep lifter tick at bay as the PRs are just barely long enough, almost not long enough. Throw in a new water pimp while you at it.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2612140
01/25/19 05:10 PM
01/25/19 05:10 PM
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Trumbauersville PA
ric3xrt Offline
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What Dave said X2 , but I'll add ...yes get the heads checked it's rare that one of these eagle heads crack...but not impossible.


Truth has no agenda, but those with an agenda make their own truth.
Some of us are so open minded they only see their View



Re: 2012 Durango RT oil in coolant [Re: HotRodDave] #2612529
01/26/19 01:07 PM
01/26/19 01:07 PM
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Originally Posted By HotRodDave
I would almost bet it's head gaskets also.

My advice, Get a 6.4 cam and valve springs while your in there and carefully check every lifter, roll it on a clean piece of glass and listen for anything thats not a normal rolling sound and replace the bad ones, even better just buy 16 new ones if you can swing it. Machine the heads to make sure they seal up real good, while they have em tell em to take .020 off, this will give you a smidgen more compression and a tiny bit more lifter pre-load to keep lifter tick at bay as the PRs are just barely long enough, almost not long enough. Throw in a new water pimp while you at it.


I was planning on getting the heads gone through. I do not want to do this again. I am assuming the 6.4 stuff won't affect the computer?

Does anyone recommend a gasket kit?

Heads are just about ready to come off. Looks like there was coolant mixing in the oil as well. It had just started spraying on the underside of the valve covers.


70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2612699
01/26/19 06:31 PM
01/26/19 06:31 PM
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HotRodDave Offline
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The 6.4 stuff helps even with the stock computer, it helps even more if the computer is tuned for it.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2612700
01/26/19 06:34 PM
01/26/19 06:34 PM
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The 6.4 SRT cam is over $100 less than the 5.7 cam. The 5.7 springs are a couple hundred cheaper and seem to work ok and have similar spring pressure so I don't know what the difference is but I would get the 6.4 springs if I could swing em. The 5.7 springs do break occasionally after about 150,000 miles thats why I recommend replacing them while you have it apart.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2012 Durango RT oil in coolant [Re: HotRodDave] #2613007
01/27/19 12:36 PM
01/27/19 12:36 PM
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Mesa , Az
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Originally Posted By HotRodDave
The 6.4 SRT cam is over $100 less than the 5.7 cam. The 5.7 springs are a couple hundred cheaper and seem to work ok and have similar spring pressure so I don't know what the difference is but I would get the 6.4 springs if I could swing em. The 5.7 springs do break occasionally after about 150,000 miles thats why I recommend replacing them while you have it apart.


Thanks! Going to look into the cam/springs/lifters. We are keeping this thing forever and I don't wan't to redo this again.

I ripped everything apart. What a mess. I have never pulled apart an engine that has pumped oil into the coolant. There are no obvious signs of failure, at least on the gasket surface. Is there a particular spot that these heads crack or gaskets fail?


70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2613020
01/27/19 01:26 PM
01/27/19 01:26 PM
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N.E. Ohio
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Do those things have an oil cooler?

If so thats where I`d be looking.


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Re: 2012 Durango RT oil in coolant [Re: HotRodDave] #2613395
01/28/19 09:16 AM
01/28/19 09:16 AM
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Trumbauersville PA
ric3xrt Offline
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Originally Posted By HotRodDave
The 6.4 SRT cam is over $100 less than the 5.7 cam. The 5.7 springs are a couple hundred cheaper and seem to work ok and have similar spring pressure so I don't know what the difference is but I would get the 6.4 springs if I could swing em. The 5.7 springs do break occasionally after about 150,000 miles thats why I recommend replacing them while you have it apart.



X2 on the spring, the issue with using the 5.7 spring would be in the higher RPMs over 6200, valve flutter

I have run that cam both ways wit tune and with tune, w/tune slightly better fuel mileage, you can feel it come on strong after 3000/3200 only issue I've had with out the tune was some cold weather start ups, and idling but once it got up to temp it ran just like the stocker cam.


the place that I see the gasket failing the most is the slot where the block feed oil to the head bolt that feeds the rocker gear.


Truth has no agenda, but those with an agenda make their own truth.
Some of us are so open minded they only see their View



Re: 2012 Durango RT oil in coolant [Re: ric3xrt] #2613483
01/28/19 01:34 PM
01/28/19 01:34 PM
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Originally Posted By ric3xrt
Originally Posted By HotRodDave
The 6.4 SRT cam is over $100 less than the 5.7 cam. The 5.7 springs are a couple hundred cheaper and seem to work ok and have similar spring pressure so I don't know what the difference is but I would get the 6.4 springs if I could swing em. The 5.7 springs do break occasionally after about 150,000 miles thats why I recommend replacing them while you have it apart.



X2 on the spring, the issue with using the 5.7 spring would be in the higher RPMs over 6200, valve flutter

I have run that cam both ways wit tune and with tune, w/tune slightly better fuel mileage, you can feel it come on strong after 3000/3200 only issue I've had with out the tune was some cold weather start ups, and idling but once it got up to temp it ran just like the stocker cam.


the place that I see the gasket failing the most is the slot where the block feed oil to the head bolt that feeds the rocker gear.



That slot is exactly where I was thinking. Nothing is popping out at me but there is no coolant in the oil except splattered on the top inside of the valve cover. I am assuming this is more of a corrosion issue than a "blown" head gasket.

I talked to the machine shop and they said that hemis have a tendency to drop valve seats. If I remember correctly that was the earlier heads?

Does everyone just reuse stock hardware or should I get studs? I was just going to order stock head gaskets as well.


70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2613577
01/28/19 04:36 PM
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Buy new head bolts, the stockers are Yield to torque, ARP head bolts are a better long term deal...In my opinion


Truth has no agenda, but those with an agenda make their own truth.
Some of us are so open minded they only see their View



Re: 2012 Durango RT oil in coolant [Re: ric3xrt] #2617476
02/05/19 09:20 PM
02/05/19 09:20 PM
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Machine shop got back to me. Turns out head is cracked. Anyone else ever had this issue?


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1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2617907
02/06/19 05:02 PM
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I have only seen about 50 of them but never a cracked one, but that don't mean it's impossible just rare.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2012 Durango RT oil in coolant [Re: HotRodDave] #2618456
02/07/19 09:34 PM
02/07/19 09:34 PM
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Originally Posted By HotRodDave
I have only seen about 50 of them but never a cracked one, but that don't mean it's impossible just rare.


Of course it happens to me.... Probably going to cut in half and see exactly where.


70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
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Re: 2012 Durango RT oil in coolant [Re: Jambbii] #2618718
02/08/19 04:25 PM
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Good excuse to get some ported heads for it.................

Re: 2012 Durango RT oil in coolant [Re: WO23Coronet] #2618731
02/08/19 04:43 PM
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Originally Posted By WO23Coronet
Good excuse to get some ported heads for it.................


Cheaper to buy some apaches or BGEs. On the other hand I don't think more flow is going to help power without big upgrades through the system because the eagle heads already flow so good.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2012 Durango RT oil in coolant [Re: HotRodDave] #2618736
02/08/19 05:02 PM
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I've read conflicting reports on this but do you have to notch the cylinders with 6.4 heads on a 5.7 or will the valves clear? I thought I saw a build on here where a 6.4 head will clear a 5.7 bore (close but it does) but several "experts" on sone Gen 3 groups on FB howl that they don't. Oh and if the heads are coming off may as well put headers on as well (it's very easy to spend your money lol)

Re: 2012 Durango RT oil in coolant [Re: WO23Coronet] #2618835
02/08/19 09:07 PM
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Originally Posted By WO23Coronet
Good excuse to get some ported heads for it.................


Oh trust me I thought about it. Going to do a valve job and mill them a tad.


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1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100
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