Smoke after running for about 20 minutes

[87Chief]

Hello,

when I drove to work, about 20 mins, I start seeing a lot of smoke coming from under the hood and I smeel which seems like exhaust maybe oil or something. I don't know but I do have a cracked valve cover... I might be replacing that soon, if I can find an aluminum one.

 

Can anyone help? I will have pics soon..

[jimoshel]

Can you see if fresh oil is leaking out from under the valve cover and running down to the exhaust manifold and/or exhaust pipe?

[james750]

What color is the smoke?

 

Blue=oil

 

white=coolant

 

black=unburned fuel

[87Chief]

There is oil sitting next to the valve cover and exhaust manifold when I turn off the engine and pop the hood. There are cracks in the valve cover... But I just don't see that this much is coming out.

[james750]

Keep in mind, a little oil on the exhaust makes a lot of smoke. Also your oil pressure is much higher at cruising/driving RPM's vs. idling, and much more oil will come out of cracks in the cover.

[87Chief]

Yeah at about 45-50 my oil pressure is about 70... And I check the oil level every once in awhile and it says Full.. And there is quite a few oil spots on the driveway

[james750]

That oil pressure reading is a tad high, I wouldn't want my oil pressure too much beyond 60 psi at any RPM. That may be something to look into as well.

[juan]

my 88 mj blow by was so bad that it was filling the engine bay (with the hood closed) with exaust and oil smell - I had a catch can collecting the blow by. This exhaust smoke had to go somewhere so it found its way thru my shifter into the cab and made driving with the windows open very difficult. My solution, I ended up swapping another engine.

[87Chief]

Yeah I figured I would have to do an engine swap sooner or later but it only has 131k... Lol I'll probably put another 2.5L just because, no dealing with wires and it's just a DD to school and stuff.

 

About the oil pressure. What could cause that?

[jimoshel]

Faulty gauge or sending unit. Get a mechanical unit and check. Sticking relief valve in oil pump.

[87Chief]

Thanks.

 

Would this fit on my 2.5L? for a valve cover?

 

http://cgi.ebay.com/ebaymotors/Jeep-Wra ... _500wt_956

[87Chief]

Well?

 

And also, if I get the PVC valve and hoses and stuff from a '91+ cherokee would they work with the wrangler valve cover??

 

Thanks