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Old 06-23-2003, 09:01 PM
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Location: austin, texas
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oil filler cap pressurized/ engine won't stop

My 300 wagon blew it's oil filler cap off! Talk about pressure. it's physically broke. A few days later now I am having the engine stop problem, haven't checked for vacuum leaks yet, and I am wonderring if anyone sees a connection between these two events. Could it be related to biodeisel use. FOr the sake of all veggies I do hope not. Fuel filters changed 100 miles ago.
I have the slightest front end wag at idle and have been lazy about checking the rack dampner screw.
Also new to computers and this forum and wonderring where I may find or search for a used fuel sending unit/tank gauge.
thanks. bowlcole

BTW, Nothing in the archives under exploding oil filler caps.

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Old 06-23-2003, 10:51 PM
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The shutoff problem would probably be the vacuum switch either at the Injection Pump, or the Ignition Switch. As to the oil filler cap blowing off Sound like no crankcase ventilation. I'd check the PCV Hose to see if it's clogged. To check if you have excessive blowby I'd try running the engine with the cap off, if it puffs like a smokestack that's too much, A little blowby is normal. I'm sure other people with more experience have more input.
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Old 06-24-2003, 03:38 AM
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I'd like to see some of the old pros/ experts comment on this. I know diesels can run on their own crankcase vapors if sufficient quanity is availible. Is that a possible scenario in this event?
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Old 06-24-2003, 07:35 AM
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Location: Old Lyme, Connecticut
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coleman kelly,

Try searching for threads on blow-by and crankcase ventilation. The cap blowing off sounds like your crankcase ventilation is plugged and you are eventually pressurizing the interior parts of the engine that are intended to remain at atmospheric pressure. It also sounds like this may have damaged your fuel shut-off mechanism, which works on vacuum. The vacuum can't shut the engine down if there is no intact diaphragm, or if the mechanism has been distorted and there is more than the as-designed resistance.

If you are not familiar with these devices, please be careful. There have been reports of runaway engine racing resulting in destruction of the engine if the shut off mechanism is not functional. Check the manual shut off lever and see if it is bound or free, and working.

I am not aware of how biodiesel might have caused this problem, but I would not rule much out at the moment. By the way, did the dipstick pop out of its hole? If not, you may just have had a really worn out oil filler cap and its failure may have had little to do with internal pressure build up. Good luck, Jim

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