I am in the process of replacing some of the PCV system in my 240. Once I removed the oil sump, I noticed that the small hole with the rubber flange seal on the block is clogged about 1 inch down the tube. According to diagrams, this is the oil return tube. Everything I read on forums about this says "DO NOT TOUCH!" and "DON'T MESS WITH THIS!".

I look at the diagrams () and it looks like a simple tube installed from the top (since the flange is on the top), but everything I read says that it's installed from under the engine and require oil pan removal. What is correct?

What I really want to know is what is my best chance of cleaning this without removal? If I stick a small screwdriver or drill bit down here will I dislodge the tube? or would I have to pull the flange down with it to dislodge it.

I'm open to suggestions that don't involve dropping the pan (but I will if i have to)...

Thanks!
Chris

 

The idea is not to push down or break parts of the tube which then will necessitate the pan removal to get to it. I'd carefully try to clean that clogage, see what happens. Especially since you are not terrified by the idea of pan removal...

 

Well, it seemed to work...

I was gentle with a small drill bit then moved up in size until I got to a 3/8" spade bit... The it was still clogged so I sprayed some PB blaster in the hole and let it sit for a while. A little gentle stirring and prodding with a coathangar and I broke through the clog... Put everything back together and she started right up. Now to change the oil.

It can be done!

Next time I have the pan off I'll change this tube. I'm sure I left some gunk in it.