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Farmall & IHC Tractors Discussion Forum
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686IH

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ohio dick

04-30-2006 07:08:21




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I have two 686's one with a 310 engine one witha 312. The 312 does not have the power the other tractor has. I Have tunedup both.Now i want to open up the american bosch pump can some one explane the procedure.




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ohio dick

04-30-2006 20:24:41




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 Re: 686IH in reply to ohio dick, 04-30-2006 07:08:21  
I am a mack truck mechanic i have done complete tuneup on both machines. The robert bosch pump was give a rebuild and calibration last year at an autherized bosch rebuilder. I just need a little more power.



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the tractor vet

04-30-2006 08:44:22




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 Re: 686IH in reply to ohio dick, 04-30-2006 07:08:21  
That is best left to the pros and done either on a test bench or while the tractor is on a dyno , as one could vary easyly end up maken a bunch of spare parts . myself i would want to know what it is putting out , Now have you run the overhead (valves) and made sure that they are set correctly as valve adjustment on a diesel is most important and is the pump timming set dead on is the throttel linkage giving full throttel ?? is it running to rated RPM , just because the tach on the dash sayes that oh yea we are right up there did you check it with a real tach??? . Just opening up the pump and twisten a couple screws can get ya in trouble real fast . Now even though the other 686 will run around the one with a 312 in it it may be tweeked way past what the book calls for so you woud have to run both on the dyno to see just where that one is and it just might scare ya , Now i am a horse power nut and have tweeked my fair share of them and yes i have made my fair share of extra non useable parts over it . Keep i mind that for every 10% ya crank one up ya take away the same amount in life span .

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