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John Deere Tractors Discussion Forum
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Re: John Deer 4020 timing

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08-23-2013 15:01:29

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Most Stanadyne pumps, JD included are timed at TDC, end of injection. Actual beginning is in 15 to 20 degree range. Even Bosch inline 4430 running timing is 28 BTDC. TDC is used for timing, but after port closure, beginning injection on # one barrel is found pump cam is turned 14 degrees and mark applied. To help starting Bosch has a retard start notch cut on plunger that only works at full rack travel that closes the port 5 to 10 degrees later depending on how deep it's cut.

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08-23-2013 15:53:18

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 Re: John Deer 4020 timing in reply to Dieseltech, 08-23-2013 15:01:29  
When you say "timed" I'm not exactly sure what you mean. There is time of injection pulse at the pump , time of pulse at the injector, time of injection in the combustion chamber, and time of actual combustion. There can be a 4-6 degree difference in lag. Depending on what someone is trying to check, "air timing" can be used to verify static timing, or factory pump timing marks can be used if they are known to be correct. A timing light can be used to check injection pulses on an injector line and a luminosity probe can be used (on some engines) to check actual time of combustion.

For Deere, Stanadyne gives time of injection pulse at the pump only, along with whatever range the automatic advance provides. Standadyne also gives specs per pump # of exactly what degree point the timing mark is etched on (and it differs). It also dumbs things down a little since when installing a pump -we assume the timing marks have been put in the correct place on a degree wheel.

One nice thing about JDB pumps on most Deere machines is an easily adjustable timing advance that can be correct on a running machine with no special tools other then a $10 plastic timing window.

My main point in regard to commenting was to the claim of setting the timing to "10 degrees BTDC." Regardless if that is a recommendation for pump degrees static timing (which equals 20 engine degrees at the crank), or for 10 engine degrees (5 pump degrees) . . it represents a problem on an engine if the advance is working properly. To the converse - it can be a short-tern "easy" fix for an engine that has a totally non-working advance.

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08-23-2013 19:15:46

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 Re: John Deer 4020 timing in reply to jdemaris, 08-23-2013 15:53:18  
You are correct about some lag, what I meant to say is no diesel is truly timed at TDC beginning of injection. The marks can be placed wherever the engine and pump builders agree on. I used to use the timing window, but like the batwing gauge better when checking the advance curve on the dyno. More engine builders are using the lock timing method on the pumps now, which works well until the lockpin or bolt is not set to running position, and engine is started.

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