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Decompressor lever

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Bill

09-14-2001 02:23:49

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In Fordson Major Diesel tractor there is a decompressor lever in the front of the engine. When starting with the lever on decompression position, should the lever return to the normal position by itself when the engine starts? Why doesn't the engine start when in the decomp. position?

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Steven B

09-14-2001 03:47:46

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Re: Decompressor lever in reply to Bill, 09-14-2001 02:23:49

The decompression lever was an option in some areas, standard in cold climates (eg New Zealand) or not available in others (eg Australia). The lever lifts the valves of thier seats (hence the reason the engine will not start)and alows the engine to be turned by hand (16:1 comp ratio makes the engine hard to turn over) and is used in cold weather. The procedure for use is engage the lever, turn the engine with the starter or by hand for about a dozen revolutions. This will pump oil up to the crank. Return the lever to its normal position and start the engine.

The lever is also usfull when setting the timing and when trying to start the engine with a partialy flat batery. The later requires two people. Decompress and engage the starter. As the engine turns over return the lever to the normal position. The lever will not return automaticaly.

Steven B

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tom

09-15-2001 13:45:18

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Re: Re: Decompressor lever in reply to Steven B, 09-14-2001 03:47:46

On my FMD the Decomp lever returns automatically, when i start the engine.

My starting procedure is: push fuel excess button, lift deco lever, then push starter lever and the engine runs. That�s all.

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Bill

09-18-2001 07:56:39

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Re: Re: Re: Decompressor lever in reply to tom, 09-15-2001 13:45:18

Thanks for answering.

Could it be that the lever was somehow tightened too much when reassembled and because of that it doesn't return by itself. Do you know how to "loosen" it?

Or could it be that it was never ment to do that? Does anyone have an owners manual that is newer than mine? My owners manual is older than my tractor and it mentions only the early type decompression lever which was located on the back of the engine. The early type lever was used in the way Steven B is saying and it didn't return by itself.

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Brian

09-19-2001 01:30:32

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Re: Re: Re: Re: Decompressor lever in reply to Bill, 09-18-2001 07:56:39

Bill,
Neither type of decompressor was meant to return automatically. The decompressor is only meant to be used in conjunction with the cranking handle and not with the starter. The idea was (as Steven says) to turn the engine by hand to break any oil locks and to get the oil pump and fuel system primed in really cold conditions.

The handbook for the tractor "Be sure that the decompressor lever is returned and locked in the running position before continuing" (starting proceedure).

"This control, located at the front of the rocker cover, enables the valves to be held off their seatings, so releasing the commpression in each cylinder and allowing the engine to BE TURNED BY HAND".

(Information from the Great God Fordson, published December 1954, price 2/- (English shillings).

regards
Brian

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Bill

09-19-2001 04:52:22

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Re: Re: Re: Re: Re: Decompressor lever in reply to Brian, 09-19-2001 01:30:32

Thanks Brian.

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