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If someone did put it back wrong could it not be advanced or retarded some. I still think it is better to line up everything then check to see who what when and where?chris, no this is where some people get confused. the mark under the small cover with 4 bolts is a timing mark to time the entire pump with the engine. the red tooth with line scribed on it is only for servicing the HH. when the red tooth is lined up the HH should lift out easily. now if someone put it back togeather incorrectly that would change everything, but i doubt it would run.
well yes that is right but that's the point! not everything lines up at the same time!If someone did put it back wrong could it not be advanced or retarded some. I still think it is better to line up everything then check to see who what when and where?
So you could line up balancer line, pointer line and the HH should be off to the rear by one tooth. Timming is correct. Then advance motor till HH head scribe and pointer are aline, change head and you should be good right.????
Not to be disrespectful Tom, but I think it is YOUR information that is incorrect and confusing. The hydraulic head has basically 2 functions, one is provide a high pressure, metered volume of fuel 3 times per crankshaft revolution, and the second is to distribute it to the correct cylinder at the correct time - to initiate and sustain a combustion event. I won't proclaim myself to be an injector pump "expert", but I have worked with far more complex mechanical devices during decades long employment as a machine tool tech, and also as an aerospace instrument maker and integrator. I did read TM 9-2910-226-34 to understand the function of the hydraulic head and injector pump drive components, and their relationship to the timing marks on the crank balancer, and pump shaft. Of course, you can turn the engine over until you are at TDC on #1 cylinder, verify the balancer, pump shaft, and hydraulic head timing marks are all lined up, but assuming the engine was a runner before HH failure / removal, you can remove and install the HH by just painting a new alignment mark on the HH drive gear and reinstalling it to the same timing mark - AS LONG AS YOU DO NOT ROTATE THE ENGINE WITH THE HYDRAULIC HEAD REMOVED.maxspeed250, your info is very wrong and may cause someone to damage their pump. you MUST line up the scribed (red) gear tooth with the pointer for internal components to clear when lifting the head. any other position will do damage. perhaps you or someone else before you damaged your pump and it came apart, but this is NOT the way to do it. it should be noted that replacing the head has nothing to do with 'timing' marks in the usual sense. the scribed gear is only to locate the notch in the drive gear shield. the red gear has nothing to do with actual injection pump timing.
I disagree with your statement here. The gear that drives the hydraulic head has a cap/washer on it. That washer has an arc cut out of it. The HH will ONLY come out when the arc is facing the HH gear.Regardless of crankshaft or injector pump rotational position, when all fuel lines, governer rod, fuel control shaft, and the 4 hold down nuts and collars have been removed - the head will pull straight out off the pump body. Sometimes they are a little sticky, but it WILL come out. And my procedure works fine when the HH is being removed and replaced -again as long as the engine is not turned while the HH is removed. It is the way I swapped hydraulic heads on my M35A2 that had a seized pump head plunger, and I assure you that it runs VERY WELL!
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