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Oil Leak on Head Nut Below Intake (Read 480 times)
calabria1922
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Oil Leak on Head Nut Below Intake
04/18/16 at 22:14:54
 
Hi,

I just purchased a 2013 S40 with 225 miles for my wife.  After Driving it from SE Portland to just north of Seattle, I noticed an oil mist on the cooling fin below this head nut on the intake side.  There is a similar head nut on the exhaust side.  You can locate this nut on the drawing in the shop manual attached.

It is noted as "15" on the drawing.  After closer inspection I could feel a very small amount of oil above this head nut.  Ignore the arrow, it's not pointing to the nut I am talking about.

Has anyone else experienced a leak at this location?

If so, how did you fix it?

I am assuming it needs to be fixed even though the leak is on the order of one drop of oil every 300 miles, correct?

It is in the shop now having it's 600 mile check which I decided to have them do as it includes re-torqueing the head bolts.

Thank you everyone in advance any help you can provide!!!

Scott.
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Re: Oil Leak on Head Nut Below Intake
Reply #1 - 04/18/16 at 23:00:08
 
Maybe give it a good degrease and pressure clean and see where the oil is really coming from. There's no oil supply near that nut. But the head nut at 23  has an oil gallery surrounding it and it's sealed with a copper washer (25). It seems like a few leak here. Mine did. A smear of RTV fixed it. The oil could be from there and migrating around to the back of the cylinder. That's all I got.
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Re: Oil Leak on Head Nut Below Intake
Reply #2 - 04/19/16 at 05:04:31
 
The pressurized oil that comes up the right rear head stud tends to weep a bit of oil around the 3 plies of the head gasket, and some of it can ooze out the front and rear studs under the intake and exhaust ports.....it is a fairly common issue.

Remove the nut, clean the cylinder, nut and stud to get the oil off, and then put a bit of RTV sealant on the threads and the bottom of the flanged nut.....the reinstall the nut.  Tighten it pretty snug.....a pretty hefty tug on the wrench with one hand - but not Gorilla tight.  And....since you are doing one - you might want to get the other one at the back of the engine under the intake port.
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Re: Oil Leak on Head Nut Below Intake
Reply #3 - 05/05/16 at 18:54:21
 
So my 2001 was doing the oil-smoke and there was a lot of oil on the left-side engine. I did the oil-cap repair (a long tale that I will recount in another thread).  Now that everything is back together I've had it up and running a couple times to test my results, I noticed it still smoked after 15-20 minutes of run-time.  Here is some video of the nut actually leaking, but also smoke coming out from under the right side.  Not sure if they're related, but thought I'd ask if anyone has encountered such a thing.
https://vimeo.com/165519746
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Re: Oil Leak on Head Nut Below Intake
Reply #4 - 05/06/16 at 00:21:38
 
You need to do RTV like Dave said!
I did it and problem went away!
smoke looks like it is because the head is hot but I may be wrong
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Re: Oil Leak on Head Nut Below Intake
Reply #5 - 05/06/16 at 05:57:41
 
Yep....and I need to do mine as well!

I noticed that the exhaust side nut on my bike is getting oily.

The interesting part of the video.....it looks like the oil is moving around....what is causing that?

I am not sure the oi on the bottom of your clutch cover would be traced to to the nut under the exhaust....that is a long way for that oil to travel, and when in motion the oil would most likely just get blown around to the back side of the cylinder.
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Re: Oil Leak on Head Nut Below Intake
Reply #6 - 05/06/16 at 07:15:35
 
The oil dancing around is (in my guess) because it's really hot at at this point. I think there's also some capillary action going on with the threads, maybe in combination with engine vibration?  Maybe? Hell, i don't know.  Tongue

I'm in agreement that it's unlikely the two things are related. Really confused about that smoke. Will investigate further over the weekend.  
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Re: Oil Leak on Head Nut Below Intake
Reply #7 - 05/07/16 at 17:09:24
 
A good cleaning and sealant fixed the nut-leak problem quite nicely. The smoking on the side appears to have gone away too, which makes no sense to me, but I'll take it.  Shocked
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Re: Oil Leak on Head Nut Below Intake
Reply #8 - 03/07/18 at 23:25:07
 
i have I leak on my 2004 savage. on the right side I have not done a lot of looking but the oil is getting most everything oily on the right side even my boot.  Embarrassed any ideas? is it just one of these nuts loose?
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Re: Oil Leak on Head Nut Below Intake
Reply #9 - 03/08/18 at 07:22:10
 
Jody72 wrote on 03/07/18 at 23:25:07:
i have I leak on my 2004 savage. on the right side I have not done a lot of looking but the oil is getting most everything oily on the right side even my boot.  Embarrassed any ideas? is it just one of these nuts loose?

Look next to the exhaust header and you'll see an opening in the head.
If it's oily there, it's the head plug.
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Re: Oil Leak on Head Nut Below Intake
Reply #10 - 03/18/18 at 23:04:39
 
:'( :'( :'( my plug needs changed :'( :'( :'(  verslagen1 you still selling plugs?
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Re: Oil Leak on Head Nut Below Intake
Reply #11 - 03/19/18 at 07:13:04
 
Jody72 wrote on 03/18/18 at 23:04:39:
:'( :'( :'( my plug needs changed :'( :'( :'(  verslagen1 you still selling plugs?

Yes, click on the link or send me an email.
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Re: Oil Leak on Head Nut Below Intake
Reply #12 - 03/19/18 at 08:27:37
 
Everyone who Didn't torque the head didn't have a problem.

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Re: Oil Leak on Head Nut Below Intake
Reply #13 - 03/19/18 at 10:20:45
 
justin_o_guy2 wrote on 03/19/18 at 08:27:37:
Everyone who Didn't torque the head didn't have a problem.


JOG ,That's an interesting statement! Are they forgetting these are also head bolts? It would explain the leaks ,as they would not be tight if the four on top were torqued and these two were not.
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Re: Oil Leak on Head Nut Below Intake
Reply #14 - 03/19/18 at 10:36:49
 
The maintenance manual doesn't say to use sealer on the plug. And they don't.
And they CAN reuse the original if it's not damaged. And charge for the new one. And who would ever know unless you demand they keep the old parts.
Plug leaks after the job isn't uncommon.
Sure, some leak, even If they have never been touched, but a correlation between
The head bolts have been retorqued
And
My plug is leaking
Seems pretty solid to me.

That's just my opinion,
But I never touched mine.
Put twenty thousand miles on it.
Never a leak.
Never a head gasket problem
And
Nobody I know of
Who decided that retorquing
head bolts was silly
Has regretted it.
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