You MIGHT be able to get an 1/8 of a turn on the screw BUT if the pump re-builder put it back to factory then he would have put the shims back under the retaining clamp. If he did this, like John Deere's have from the factory, you can't get the screw to tighten on the clamp any more. I have had to fix several pumps where the owners "tried" to set the fuel up and twisted the screw off. If this happens about half of the time you just scraped the rotor. The last new one I put in was about six hundred bucks. So you can take the same money and replace the injectors or gamble on a pump repair. I am not a fan of turning up injection pumps. The rest of the tractor is made for so many horsepower. When you create more at the engine then you may make other things fail.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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