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 Post subject: Weird oil leak
PostPosted: Thu Oct 06, 2011 6:21 pm 
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Neon Enthusiast

Joined: Sat Sep 10, 2005 5:44 am
Posts: 194
Location: Clarksburg, WV
Ok I'm completely stumped... I've searched and read a lot of posts and stuff, and still stumped...

I have a 98 DOHC MTX, 156k miles... I have a bad oil leak on the driver's side of the motor. That side of the head, the whole transmission, and back of the motor on that side are coated in oil. I replaced the valve cover, cuz it was leaking, and its still there. I just looked at it again, and i would swear its coming from around the little half moon section of the head where the end of the exhaust cam is... and then running down the head, onto the transmission, and also being blown to the back of the motor. I've already replaced the oil sending unit as well, so that's not the culprit...

Pics...

Side of the head, top of transmission
Image

Looking straight down at the end of the exhaust cam
Image

That lil half moon thing is where its coming from
Image

Looking down at the driver's side corner of the motor/tranny/brackets
Image

I'm confused! lol

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 Post subject: Re: Weird oil leak
PostPosted: Thu Oct 06, 2011 6:35 pm 
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Neon Enthusiast

Joined: Fri Feb 22, 2002 7:48 pm
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Location: Altenburg, MO
Are you sure it's all coming from there? If it has never had the head gasket replaced I bet it's leaking from the head gasket below the EGR valve. That's where they normally leak if they've never had the head gasket redone..

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 Post subject: Weird oil leak
PostPosted: Thu Oct 06, 2011 6:58 pm 
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Neon Enthusiast

Joined: Sat Sep 10, 2005 5:44 am
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Location: Clarksburg, WV
Well that's what I was thinking, but I'd love to think that's not what it is. Lol. It's coming from the side of the head, above the trans. In the pics, it's dry, I can start it, rev it up, and watch it run down the side of the head, then down to the back of the motor

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 Post subject: Re: Weird oil leak
PostPosted: Thu Oct 06, 2011 7:02 pm 
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Neon Enthusiast

Joined: Sat Sep 15, 2007 4:49 pm
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Location: Selinsgrove, PA
Best way to diag an oil leak is to clean it all off as best as you can, drive it for a while, then check it in a week or so. Once there is already oil all over the place, it just looks like everything is leaking.

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 Post subject: Weird oil leak
PostPosted: Thu Oct 06, 2011 7:51 pm 
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Neon Enthusiast

Joined: Sat Sep 10, 2005 5:44 am
Posts: 194
Location: Clarksburg, WV
Well, I tried that. I cleaned what I could, couldn't really get to the back of the engine with the air box... But I had the transmission and that side of the head spotless, and now it's covered again.

Like I said, you can watch the oil run down the side of the head, from around that cam.. What is that?? It looks like it has some sort of sealant around it.

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 Post subject: Re: Weird oil leak
PostPosted: Thu Oct 06, 2011 8:36 pm 
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Neon Enthusiast

Joined: Sun Nov 09, 2008 3:43 pm
Posts: 652
Location: Chesapeake, VA
Cam position sensor o ring. Or it is leaking from the valve cover gasket from not torqueing it correctly or from not putting rtv in the corners.

Do you have a FSM?

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 Post subject: Re: Weird oil leak
PostPosted: Thu Oct 06, 2011 8:56 pm 
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Neon Enthusiast

Joined: Sun Nov 09, 2008 3:43 pm
Posts: 652
Location: Chesapeake, VA
NOTE: Before installation, clean cylinder head and
cover mating surfaces. Make certain the rails are
flat.

(1) Install new cylinder head cover gaskets.
CAUTION: Do not allow oil or solvents to contact
the timing belt as they can deteriorate the rubber
and cause tooth skipping.

(2) Apply Mopar Silicone Rubber Adhesive Sealant
at the camshaft cap corners and at the top edges of
the 1/2 round seal.

(3) Install cylinder head cover assembly to head
and tighten fasteners in sequence shown in (Fig. 21).

Using the 3 step torque method:
• Step 1 Tighten all fasteners to 4.5 N·m (40 in.
lbs.)
• Step 2 Tighten all fasteners to 9.0 N·m (80 in.
lbs.)
• Step 3 Tighten all fasteners to 12 N·m (105 in.
lbs.)
(4) Install ignition coil pack. Tighten fasteners to
12 N·m (105 in. lbs.).

Image

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 Post subject: Re: Weird oil leak
PostPosted: Thu Oct 06, 2011 9:16 pm 
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Neon Enthusiast

Joined: Sat Sep 15, 2007 4:49 pm
Posts: 1445
Location: Selinsgrove, PA
My suggestion would be to degrease and clean everything around the valve cover area, let it dry, wipe the valve cover and cylinder head area down and make sure its dry, then remove the valve cover and gasket.

You should be able to tell if it is leaking pretty easily. The part of the head where the gasket sits and seals will still be wet with oil and the valve cover and gasket will be easy to remove in the area of the leak.

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 Post subject: Re: Weird oil leak
PostPosted: Thu Oct 06, 2011 10:40 pm 
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Joined: Tue Dec 14, 2004 9:15 am
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Location: Northwest Wisconsin
When you replaced the valve cover gasket, did you replace the rubber spacers? If the spacers are rock hard, they no longer put any pressure on the gasket. The bolts are shouldered bolts and can only go so far. Other possibilities on that side of the engine are the cam sensor seal, the oil pressure switch, the rear main seal, and the head gasket. If you don't see the little mls rivets, it could still be the original composite head gasket.

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 Post subject: Weird oil leak
PostPosted: Sun Oct 09, 2011 10:32 pm 
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Neon Enthusiast

Joined: Sat Sep 10, 2005 5:44 am
Posts: 194
Location: Clarksburg, WV
I don't know how to explain this. It's not coming from the valve cover, it's fine. Oil sending unit is new. CPS is new. It's coming from the exhaust cam side of the head. Right next to the CPS. I'm gonna look at it again tomorrow

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 Post subject: Re: Weird oil leak
PostPosted: Mon Oct 10, 2011 2:20 am 
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Neon Enthusiast

Joined: Fri Feb 22, 2002 7:48 pm
Posts: 3478
Location: Altenburg, MO
That little half moon piece is removable so it might be leaking here.

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 Post subject: Weird oil leak
PostPosted: Mon Oct 10, 2011 3:15 am 
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Neon Enthusiast

Joined: Sat Sep 10, 2005 5:44 am
Posts: 194
Location: Clarksburg, WV
That's what I've been trying to figure out!! Lol. Thank you!! That's where it's coming from. Is there a seal for it or what do I need to do to get it to stop leaking?!

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