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Farm Machinery
Classic Machinery
McCormick IH 434 starting problem
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<blockquote data-quote="Pennine Ploughing" data-source="post: 7277672" data-attributes="member: 999"><p>The timing marks should all line up, the gear tooth with 1 center punch mark, fits in between the 2 punch marks on gearit meshes with, </p><p>If the engine has been turned over before injector pump is fitted, then marks on pump gear, even if meshed up right could well be out, this is due to the different sizes of gears, ie, take the timing cover off and check it, </p><p>If you can be bothered after timing it up correctly, you will have to turn it over 24 times before timing marks line up again, for this reason it needs to be checked again,</p><p>Yes pump can be 180 out on some tractors, on a Nash, as the dowl will only let you fit the gear one way, so pump turns half speed of crank, so maybe 180 out, take inspection cover off the side of pump, and rota will be marked, A,B,C,D,E,F,G, I think it should be on E, but someone can correct me on this,</p><p>However thinking about it, if its 180 out, it would never get any compression on injection stroke for it to fire, as exhaust valve will be open as the piston is coming up to injection point, to check this, remove rocker cover, and both inlet and exhaust valve should be closed on the cylinder it squirts fuel out of injector pipe</p></blockquote><p></p>
[QUOTE="Pennine Ploughing, post: 7277672, member: 999"] The timing marks should all line up, the gear tooth with 1 center punch mark, fits in between the 2 punch marks on gearit meshes with, If the engine has been turned over before injector pump is fitted, then marks on pump gear, even if meshed up right could well be out, this is due to the different sizes of gears, ie, take the timing cover off and check it, If you can be bothered after timing it up correctly, you will have to turn it over 24 times before timing marks line up again, for this reason it needs to be checked again, Yes pump can be 180 out on some tractors, on a Nash, as the dowl will only let you fit the gear one way, so pump turns half speed of crank, so maybe 180 out, take inspection cover off the side of pump, and rota will be marked, A,B,C,D,E,F,G, I think it should be on E, but someone can correct me on this, However thinking about it, if its 180 out, it would never get any compression on injection stroke for it to fire, as exhaust valve will be open as the piston is coming up to injection point, to check this, remove rocker cover, and both inlet and exhaust valve should be closed on the cylinder it squirts fuel out of injector pipe [/QUOTE]
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McCormick IH 434 starting problem
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