1GM10 starts in reverse

[barryg]

My 1GM10 300 hours well maintained difficult to start when left for a lenght of time and then fires up in reverse exhaust coming out of air filter has blown foam of air filter,What is the cause it has been suggested timing. When running and warm sweet as a nut, lots of compression,exhaust elbow clear, water pumping well.

 

[agurney]

Sounds normal, it's just bouncing off the compression. Needs a bit more oomph from the battery. Spinning the engine with the decompression ever up then dropping it while it's turning should do the trick.

 

[rhumlady]

When yu say it starts in reverse do you actually mean it is running the wrong way? If so have you been doing anything with the starter wiring and got it the wrong way round?

 

[wiggy]

I had the same problem, sorted by getting the injector serviced, still happened occasionaly and finally soved by starting in tickover then upping rvs once running.

 

[Yarmouth one]

have you got a water trap, muffler box? if you do and it has a drain on it try draining annd go again. they are know to struggle to push the water out and will fire backwards. you say you have checked the elbow? did you remove to do so?

 

[steve28]

The decompression lever in conjunction with slightly more throttle should prevent this.

Steve

 

[ostell]

Seen this on a friends boat. Was a defective cell in the battery. Replaced battery, problem went away.

 

[dmayes]

Diesel engines

Timing cannot be the problem as the only timing a diesel engine has is when the injectors inject. The firing is done by the compression only. They cannot actually run backwards but can backfire once as has been indicated.

 

[Ubergeekian]

Timing cannot be the problem as the only timing a diesel engine has is when the injectors inject. The firing is done by the compression only. They cannot actually run backwards but can backfire once as has been indicated.

Loads of diesel engines can run backwards.

 

[Topcat47]

Timing the injection into the combustion chamber of a 1GM10 is determined by the thickness of a shim placed between the fuel pump and the governor housing. 0.1mm alters the timing by 1 degree. There is a full explanation in the handbook. Running in reverse may be curtailed by the engine drawing in water from the exhaust trap, if you're very unlucky. As the injection is always very close to TDC, Deisels can be run in reverse, although this is seldom a good idea. The Dolphin 2-stroke boat engine was stopped and started in the opposite direction instead of providing a gearbox with a reverse gear.

 

[Cariadco]

backwards??

I've seen this happen a few times, and allways on single cylinder Diesels.
This only happens when the engine's cold and appart from a good battery, the only other measure to stop it occuring, is to ensure there's been plenty of heater Plug application, before cranking the engine.

I must admit, it frightened the hell outta me, the first time it happenned!!!

Regards,

 

[ostell]

is to ensure there's been plenty of heater Plug application

This engine doesn't have a heater plug.

 

[pmerkulov1]

Starting in reverse

Try this trick.Pull engine stop button,push engine start button and slowly push engine stop button.This works for me.Last year i putted a new engine and from the begining it fired in reverse all the time.My mechanic showed me this trick and it works.Try.Peter,CD25D,hull#32,1982

 

[KenMcCulloch]

Timing cannot be the problem as the only timing a diesel engine has is when the injectors inject. The firing is done by the compression only. They cannot actually run backwards but can backfire once as has been indicated.

I love it when a 'diesel expert' makes this kind of categorical pronouncement only for half a dozen 1GM owners to recount their experiences. I have certainly had mine running backwards at least once, it took me a moment to work out what was happening and stop it, but no permanent damage seemed to ensue.