Yes, there's risk of the tube breaking off.
I very carefully used GUNK motor-flush crankcase cleaner to soften any junk in the tube to help clean it. Details follow at the end of all this stuff...
In the FAQ, scroll down to index (silly place for it down there, IMHO)
Go to Engine - Seals - Belts - Crankcase Ventilation.
Read everything in crankcase ventilation.
I used the method of access to the breather box "without removing intake manifold". Worked well. However note -
The later 240s ('88 and later) have a bigger breather box that's tougher to get off. Carefully unplug 2 or 3 electr. connectors to fuel injectors so you have slack to move the wire harness out of the way. This lets you pull the breather box up and away as described in the FAQ.
Plastic tube on outside of breather box inserts about 3/4 inch into opening in crankcase, so lift straight up as much as possible.
The fragile tube is the forward opening of the two that the breather box uses. Use a small funnel to get a bit of Gunk engine cleaner down the fragile tube, into the crankcase. The stuff you are supposed to add to the motor oil, then run engine for 5 min to clean the innards. Don't do that!, just pour a bit down the funnel into tube till it flows freely. Then get some wastable thin household extension cord, split in half, cut ends clean with no metal protruding, and slide wire down the tube gently. Slide it right thru the small funnel tip. If it hits resistance, pour more cleaner till the wire goes through.
Lastly, send down some stiff poly rope. I used one about 1/4" diam with thick strands, not the hair-fine strands. Rope went down easily, came up with oil on it. I was pleased.
When done, drain the oil pan, then do two oil changes right away to be sure you get all that cleaner junk out of there. Do the "Gunk" motor-flush procedure at your own risk, it's probably best to just get it out of there.
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DAMHIK: Don't Ask Me How I Know - - - Sven: '89 245, IPD sways, electric rad. fan conversion, e-codes, 28+ mpg - auto tranny. 500 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).
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