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New EQ Heads - Small Amount of Oil on top of Piston (Plenum Issue Fixed)

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New EQ Heads - Small Amount of Oil on top of Piston (Plenum Issue Fixed)

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  #1  
Old 07-19-2018, 11:11 PM
fcastro
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Question New EQ Heads - Small Amount of Oil on top of Piston (Plenum Issue Fixed)

Hi everyone, So I finally finished up putting my 5.9 magnum back together. I discovered I had a bit of coolant leaking from either a bad head gasket or a cracked head, couldn't tell when I took apart the heads. So now I have installed my EQ heads and everything else was reinstalled. I just recently did the plenum plate fix, being paranoid I took off the bolts and redid the full tightening sequence and used blue locktite. Got the truck and ran it for about 5 miles and the following day just for fun I decided to pull a few of the plugs and check on my nicely cleaned cylinders with my boroscope camera. I see a very small amount of oil on the piston top, check 2 more and also see a bit of oil on the side.

I am completely baffled and I am assuming this is not normal. I shouldn't have oil showing up on the top of the pistons as far as I am aware. Anyone have any ideas what the hell is going on?

There are the 8 2 and 7 cylinders. Everything was nice and clean when I installed the heads, Only thing I did was spray like 3 secs of fogging oil in the cylinders once I put the heads on to avoid any flash rust and lube the walls. I can't imagine that is the oil I am seeing.






 
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Old 07-20-2018, 06:53 AM
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Hhhmmm..... you are right, it shouldn't be pooling like that. How is your PCV system? Got a Mopar brand PCV valve in there? The aftermarket fellers aren't always the correct flow rate.
 
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Old 07-20-2018, 11:09 AM
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Nice looking heads! Is that a power steering cooler bolted to the timing cover?
 
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Old 07-20-2018, 12:54 PM
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Originally Posted by HeyYou View Post
Hhhmmm..... you are right, it shouldn't be pooling like that. How is your PCV system? Got a Mopar brand PCV valve in there? The aftermarket fellers aren't always the correct flow rate.
Yeah its OEM mopar. I replaced a few months back before I put in the plenum fix. I just looked down my intake and I did see a small oil film on the plate. I took a rag and wiped to make sure it was oil, and yes it was oil, very small coat but its there. I made a few short trips yesterday about 20 minutes each maybe 14 miles total. Today checked a few other plugs and also seeing oil on those pistons.

@ramman18 yeah that is the stock power steering cooler from an 01 durango 5.9 with tow package. I repainted it, it attached to the main block with 2 bolts.
 

Last edited by fcastro; 07-20-2018 at 01:17 PM.
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Old 07-20-2018, 01:45 PM
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Hard to tell but the cylinder looks worn/ scuffed. I don't see any cross hatching left. I don't know the quality of the image though. Maybe after having it apart it will reseat after driving it awhile? I guess I'd check the compression.
 
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Old 07-20-2018, 03:11 PM
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Originally Posted by 2bit View Post
Hard to tell but the cylinder looks worn/ scuffed. I don't see any cross hatching left. I don't know the quality of the image though. Maybe after having it apart it will reseat after driving it awhile? I guess I'd check the compression.
I think this is a good idea.
 
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Old 07-20-2018, 03:17 PM
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All the cylinders still had their cross hatching only thing is I did see what looked like a spot on a few which was a circle toward the top of the cylinder that had a worn look. I had a ton of carbon build up on the pistons had to use a scotch green scuff pad and a razor blade and b12 and mopar spray to clean it all off.

Might have to a do a compression test. But seeing that bit of oil via the top makes me thing possible the oil is coming from the pvc system.






 
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Old 07-20-2018, 04:19 PM
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I'd drive it a 1000 miles and then take a look. Check the PCV system though. That will give the valves, guides, seals, and piston rings time to break in and reseal.
 
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Old 07-20-2018, 04:21 PM
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Will do and I'll report back. I am also thinking about an oil catch can, if the oil is indeed coming from the PVC system.
 
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Old 07-20-2018, 04:24 PM
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Some of that grit and dirt had to get in the rings, it'll probably be fine after you drive it awhile.
 
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