These pictures are from the upper plenum and the top of the intake manifold (still have to remove it) of an 86 5.0L engine. As you can see, there is a problem with oil getting into the intake. A seperator should be here today or tomorrow, but I need to do this the right way and get this all cleaned out of the intake beforehand. I have sprayed Air Intake/Throttle Body/Choke cleaner and Meguiar's Super Degreaser on it with no real results. Is it okay to spray the plenum and manifold with a pressure washer, or water period for that matter? Can I use a brush? If so, what kind? Any tips would be greatly appreciated!!! This is my first time doing something like this and I don't want to mess anything up! Thanks!

Some of the oil that ran out of the plenum when I removed it.


Here's right behind the TB after scraping for about 30 minutes while it was still on. There was a good couple of MM of caked on junk. The hole in the second picture was a completely clogged and blocked by build up, although I don't know what it is for.

 

Where the plenum bolts up to the manifold.

 

The top of the intake manifold.

 

Parts washer or similar with LOTS of solvents and oil/grease cutters?

 

i'd grab a can of berkebile 2+2 carb cleaner and a wire brush and scrub it out. thats how i've always done it.

 

Being that fare into the engine I would removed the lower intake and have them both hot tanked they will come out like new

 

Your going to have to remove the lower intake to do it properly. You can't spray anthing in there or you could hydrolock the engine. Looks like you have some serious blow by. You may need a rebuild.

 

Dont you guys read?

 

Thanks for the suggestion guys!

I was thinking some excessive blow by too, but it just started blowing oil all of a sudden. Does that sound right? It was dry, then bam!

 

Maybe do a compression test and look for fouled plugs

 

they wont put aluminum parts in a hot tank the acids in it will ruin the parts what a machine shop uses is similar to a hot tank but filles with a carb cleaner bassically and it vibrates as well as pumps the solvent arround to remove the junk. they then pressure wash the part and if it still has anything in it it goes back into the tank for another round

 

Ultrasonic parts cleaning tank.

 

Thay have aluminum safe hot tanks as well. This isn't the dark ages.

 

That is most definitely going to happen when I am done cleaning everything. Now though, the intake manifold may not be coming off. I am running out of time to fix it so the extra day or two needed to do so may not be feasible at this time.

I will probably be going to town later to pick up a new gasket, plugs, and some heavy duty cleaner and have at it. Sounds like I really just need to soak it with cleaner, spray it off, and repeat.

 

With that much blowby, you have one of 3 possibilities:

1. Stuck PCV valve
2. Cracked ring
3. Blown piston