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post #1 of 11 Old 08-29-2003 Thread Starter
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High revving engine

On accelerating slightly yesterday my engine started revving very high I battled to cut the engine , eventually got it right .
any ideas - somebody said it might be oil .
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post #2 of 11 Old 08-29-2003
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High revving engine

geewhiz,

What kind of engine? diesel, gas, outboard, inboard? What did you do to "eventually get it right?"

We need a lot more info to help you.

Duane
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post #3 of 11 Old 08-29-2003 Thread Starter
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High revving engine

Sorry , the engine is a yanmar 2gm20 - 18hp 2 cylinder diesel . It came right by itself but this is the 2nd time its happend in 6 months .
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post #4 of 11 Old 08-29-2003
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High revving engine

geewiz
If it''s a diesel the only reason diesels start running away from themselves is because their mixture becomes too lean. So you either were running out of fuel-not likely if it cointinued to run. or two you have a leek in the fuel line or system some where wjere your getting air in the line. or three your filtertration system may be starving the engine of fuel. or four you have a injector pump problem. Check for leaks around fittings and gaskets first then replace all filters and check for water in the seperator. Lots of luck. Al
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post #5 of 11 Old 08-29-2003
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High revving engine

One possiblity may be the throttle cable clamp. The throttle cable outer sheath is typically clamped to a bracket near the speed control lever. When the throttle handle is advanced, the throttle cable control wire i.e. the center wire extends to advance the speed control. If the clamp is broken or loose, the entire cable(outer sheath and all) could move forward. This could cause the engine speed to be higher than expected. When the throttle handle was retarded, the cable wouldn''t come back to the normal idle position and would seem as though things were out of control. The fact that the problem corrected it''s self my indicate the cable returned to it''s normal positon until the next time it decides to shift.
I would check it out.
Jim
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post #6 of 11 Old 09-02-2003
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High revving engine

Diesels run away when they start running on an alternate fuel source. I''ve seen this occur when a diesel starts to consume its own motor oil. Cutting the fuel supply is not effective. This can happen if the motor oil is overful or has become overfilled due to a leaking fuel pump diaphagm. Check the oil to see if it is overfull or smells of diesel fuel.
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post #7 of 11 Old 09-02-2003
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High revving engine

AJS:
Other discussions (I''ve seen) of runaway diesels seem to suggest cutting off the air somehow (always problematic).
Why not just lift the de-compression lever?
Thanks in advance,
Gord
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post #8 of 11 Old 09-02-2003
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High revving engine

Yep, thats a good way to stop a runaway diesel engine. Not recommended for non-emergency use as on some motors it can cause premature wear or breakage to the decompression mechanism.
A CO2 fire extinguisher discharged into the air intake is another way.
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post #9 of 11 Old 09-03-2003 Thread Starter
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High revving engine

overful oil - looks like the cause .
I had recently filled/overfilled my oil.
Thanks to all who provided me with the various causes .
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post #10 of 11 Old 09-03-2003
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High revving engine

I had the same problem on the same engine. I overfilled the oil and the only way to shut the engine down was to cover the air inlet. Gave me quite a scare.
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