Re: Diesel Runaway

Posted by MarkB_MI on July 30, 2022 at 19:20:12 from (174.211.32.140):

In Reply to: Diesel Runaway posted by Sprint 6 on July 30, 2022 at 16:16:57:

Had a little Mercedes marine diesel run away in my friend's sailboat. Those engines use a throttle plate and manifold vacuum to operate the governor. He was changing out an injector, and was wondering if maybe there was carbon in the injector hole. I said if he cranked it over it should blow out any carbon from the empty injector hole. He did, and the engine fired up instantly (something it NEVER did). What we hadn't taken into account is he had removed the intake manifold, and now there was no vacuum to operate the governor. The little Mercedes SCREAMED. He closed the valve at the fuel tank (which he had to reach around the runaway engine to do), but it still took a minute or two before the engine died. He feared we'd destroyed it, but that engine ran another fifteen years until the boat sunk in a hurricane.

My dad had a D7 Cat run away, although I wasn't there to see it happen. He had just overhauled it and wasn't happy with how it was running, so he started fiddling with the injector rack while it was running. The rack came loose and all four injectors screwed full-on. That Cat, which normally ran around 1100 rpm, spun up to (according to the witnesses) about 7000. We normally killed the engine by putting it in gear and dumping the clutch, but that just instantly blew out the clutch. They didn't have any luck choking of the air cleaner, and there was no fuel shutoff valve (at least one that worked). They eventually pinched off the fuel line (about 1/2 inch) with Vise Grips. I helped tear down that engine, and it was trashed: Push rods all bent, broken lifters, one broken piston. Dad eventually found an old irrigation pump engine that was identical to the original and repowered it. That D7 is still running today, about 50 years later.

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