1GM10 black smoke and hard to start

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kagallag

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Hi all knowledgable 1GM10 owners/users. My 1GM10 has been v hard to start last 2 attempts. Last week it started with a very black plume from the air inlet then died after a few seconds. It did this about 6 times then eventually started and ran normally. Then Today it did the black smoke thing again but started after 2 of these coughs. I also noticed a few bubbles of what seemed like air in the oil when dipped (not water as definitely not an emulsion). Not sure if this is linked . any ideas of what might be causing 1, the black smoke and 2, the bubbles ? Thanks in advance.
 
If you got black smoke out of the intake it's possible the engine stated and ran backwards. I have read that this is fairly common on the 1GM10. Is your starter battery good ? as if the engine is turning too slowly it is possible to fire just before top dead centre causing the engine to start and run in reverse. Can't help about the bubbles but if the engine runs backwards perhaps the oil pump blows instead of sucks (might be B******ks tho)
 
Black smoke can be caused by
a) Obstruction in airflow (eg dirty air filter)
b) Overloaded engine (not the most likely if it was ok before)
c) Defective fuel injection.
Black smoke is the engines way of hinting it wants a service. /forums/images/graemlins/smile.gif /forums/images/graemlins/smile.gif
 
Thanks for the reply. The batteries were just charged at exhaust center. But I will try and start with half throttle instead of full and try a few seconds with compression lever up also. I have started to think that it had run backwards. Hope this doesnt cause big damage!
 
Do you have a starting handle, if so try and wind the engine slowly by hand and see how much compression you have, you should not be able to turn it past compression very easily.
my bet is a valve stuck or leaking.

steve
 
Sounds like it started up backwards and as was pointed elswhere the oil pump running in reverse pumped air into the sump.

One way to try and prevent this is to not replicate a woodpecker with the starter...get it engaged and keep the engine turning on the starter till it fires and runs.

I see so many folk start diesels by just nipping the key on and off and hoping the momentum will start the engine. This is a sure way of allowing the engine to bounce back and run in reverse if it is capable of this like the 1 GM seems to be.
 
No need to use full throttle to start, just a crack should do it as the fuel rack automatically lets more fuel in for a cold start. In really cold weather like this week it might help to turn it over with the compression lever lifted and then drop it as the starter is spinning. I started mine on Friday in sub zero without any difficulty.
 
Could also add stuck or damaged piston ring to list of possible causes but a compression test would show this. Might be worth hireing a tester and check both cylinders to see if it is evern & winthin tollerence
 
Don't dissagree with other posts, but no one has mentioned fuel contamination. It's very possible that if the boat has been sitting for a while you have either water, air, or sludge in your system. IMHO the most likely cause of starting and running problems with any diesel is fuel. Always check that first before looking for more complicated reasons.
 
It's only got one cylinder. Taking the cylinder head apart is easy (even for a useless mechanic like me) so I think it would be worth doing that if you suspect compression - getting access to a diesel compression tester is a pain. With good compression they start on the first turn.
 
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