Peter, In my reply to Stan I said: "Another common way for an engine to overspeed using it's crankcase oil is via seals in the turbo or blower." Common is the wrong word. It is in fact very uncommon.
Also, your point about getting well clear of an engine in a run-away condition is good too. I think we'll all be interested to read what Fred discovers. "Richmond, Peter" <[EMAIL PROTECTED]> wrote: Dave, I disagree with Turbo seals causing an engine to run on its own oil. Turbo seals are not a total seal to begin with and pressure at the seal is next to nil as the return pipe to the engine is so large any oil pressure is lost at the bearing. Oil blockage is the only possibility that would cause oil to be forced past those seals. The most likely cause of engine runaway is blow by past the pistons or major crankcase fuming being directed back into the intake. Use good oil and regular oil changes from the beginning to prevent oil galleries from getting blocked. And never try to interrupt the air to the engine in a run away situation. Stall it or dive for cover before it detonates. PeterR -----Original Message----- From: Dave Donnelly [mailto:[EMAIL PROTECTED] Sent: Thursday, 18 March 2004 9:23 AM To: biofuel@yahoogroups.com Subject: Re: [biofuel] Why is my Diesel Overspeeding? You're right Stan. Another common way for an engine to overspeed using it's crankcase oil is via seals in the turbo or blower. If an these seals fail completely and the engine runs away, the only way to stop it before it destroys itself completely is to stop the air supply, ie: shove a raincoat in the air intake. (don't use plastic bags or anything that will shred because the blower will eat them making a serious mess). Some engines are fitted with a damper on the air intake for this purpose. The fact that Fred's engine responds to the fuel shutoff suggests to me that the problem is more likely fuel pump or injectors, but if he's burning vast amounts of lube oil, it could be rings or turbo seals. Dave. Stanley Baer <[EMAIL PROTECTED]> wrote: I have heard that if the conditions of the rings are bad enough, the blowby which is vented to the intake can bring in enough oil vapours from the engine oil to cause the engine to race even though no fuel is being delivered by the injectors. stan Dave Donnelly wrote: >fred M <[EMAIL PROTECTED]> wrote: > > >>I have a 1982 Datsun(Nissan) SD22 engine in a 720 truck >that I have >>run for 7500 miles on B-100 here in Florida. Recently >the engine is >>trying to overspeed and won't rev down. Does this engine >have seals >>that can be hurt by B-100? The only way to slow down the >engine is to >>pull the manual fuel cutoff till the engine almost >stalls. Can anyone >>tell me what is going on with my engine? Fred Mars >> >> > >Fred, > >The fact that the manual fuel shutoff is able to bring the over-revving situation under control suggests to me that it is a problem with your fuel pump, associated linkages or injectors. > >1) Check the linkages first and ensure that the throttle is not binding and is moving smoothly all the way back to the idle adjustment screw. > >2) If no defect is found, you may need to pull your injectors and get them tested and possibly rebuilt at a diesel shop. Worn out or broken injectors often result in too much fuel being delivered, (the first symptoms of failing injectors is usually black smoke and rough idle). > >3) If neither of these is the case, it may be your fuel pump, but I'm a little doubtful of that. Most fuel pumps that I've dealt with deliver too little fuel when they fail. It is however an unfortunate possibility. > >There are other reasons why diesels overspeed but they don't leap to mind based on your description. > >Now the obligatory disclaimers: > >I am a marine engineer, not a diesel or automotive mechanic. > >I do not know anything about your specific machine or it's fuel pump. My comments are general knowledge of diesel engines only. I have never put a wrench on a Nissan diesel. > >My thoughts or opinions may be worth exactly what you paid for them. ($0.00) > >Hope this helps, > >Dave > > > >Do you Yahoo!? >Yahoo! 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