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Tractor Talk Discussion Forum

Cheap power upgrade for diesel tractor ?

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Chris Young

12-01-2006 09:01:50




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When I worked as a mechanic at a Dodge dealership the 94 12 valve Cummings diesels came out with a new injection pump and there was a problem with them smoking and missing at higher rpm with elevations above 5000 feet and the fix was to advance the timing on the injection pumps 2 degrees and what a difference it made!!!! A lot more power and fuel mileage went way up. So I've been thinking that some of these diesel tractors might be able to do the same thing. So bumping up the timing 1 or 2 degrees would not hurt to see what happens! I plan on doing this to my 930CK and doing 2 degrees only to start with. Maybe more is possible with out causing problems. Has anybody tried this? I think this method is a lot cheaper then making the adjustment of running more fuel through the injection pump. I know that more fuel running into the combustion chamber can make your diesel run hotter and smoke more and that smoke is nothing more then unburned fuel. Or how about doing both, more fuel and advancing the timing? Something to think about. Chris Hotchkiss, CO

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jdemaris

12-01-2006 12:35:12




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 It's been done for years. in reply to Chris Young, 12-01-2006 09:01:50  
It's been done for many years. When I worked at a Deere dealership, we did it with new and used tractors that had cold-starting and/or skipping/smoking problems. My old International Harvester manual from 1960 - states in regard to diesel timing - to advance a few degrees if better starting and more power is needed, and to retard timing if a quietier engine is desired. Also, in automotive stuff, especially diesel engines with timing-chains, like 6.2 and 6.5 GMs. When the chains stretch, the injection pumps run late, and bumping up the static timing can sometimes make a huge difference. One thing to keep in mind though, is the difference between changing static timing - usually by physically moving the injection pump or drive gear, or changing the timing advance - which usually requires an internal pump adjustment. Sometimes you don't want the initial advance bumped up, just more advance at the high end - and in that case - changing static timing is not the remedy.

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