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188D injection pump timing help.....long

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Kevin

08-04-2003 18:10:17




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Just built my new 188 Diesel for my 580B. Bolted it back in and got the hard nose all bolted up, too. All was going smoothly until tonight when I tried to install the injection pump. Felling a bit stupid right now, perhaps someone here can point me in a direction.

Problem is this - Can't seem to time it to save myself. Here's what I know:
1) Engine is at #1 TDC. That's how I left it during the buildup.
2) Installing the cam, the two dots on the gear meshed in between one dot on the crank gear.
3) Installing the rest of the gear drive up front, the pointer hands on the dummy idler gear pointed at one of the dots on the cam, and the one dot on the gear/shaft that drives the injection pump, so I think they are timed right.
4) When I bolted the flywheel up, the only way it seemed to want to line up ended up placing the timing marks right where they should be for the inspection port over near the starter. That made sense since I left it on #1 TDC.

Here's what I did tonight:
1) Move the flywheel position slightly to 8 degrees BTDC.
2) Install 2 new seals on the pump shaft, using appropriate tool. Lubed 'em up good.
3) Took a clean screwdriver and rotated the pump (inside the pump) so that the two lines in the pump window lined right up. That was per the Case manual.
4) Thought to myself, those lines would line up when the crank was at 0 degrees BTDC, not at 8 degrees BTDC. Made sense because the position of the pump driveshaft coming out of the engine was not corresponding to the inside of the pump.
5) Moved the pump position (screwdriver again) approximately 90 degrees to match the shaft coming out of the engine.
6) Carefully installed pump over shaft, using special tool for seals. (Getting a good "feel" for that now...) Am confident that the notch on the end of the pump drive shaft and the inside of the pump engaged because I felt very little resistance the whole way sliding in, except for maybe the last 1/8", and I am sure that was the plunger spring preload out on the drive gear side of things. By the way, there is a little pin on the notch that is suppsed to line up in the pump else you end up 180 degrees off. That was correct, no problem there. 7) Turn the crank to 0 degrees BTDC and the marks in the side window are nowhere close (one is not visible in the window).
8) Pulled pump back off, grumbled some and scratched my head.
9) With the pump off, I rotated the crank back and forth for say, 30 degrees. Pump drive shaft position did not seem to move. Does that sound right?
10) One thing I forgot to add was that when pulling the pump from the old engine two months ago, I forgot to wire the throttle wide open (doh!). I did pull it wide open before sliding on this time, and took my finger inside the pump bore and positioned the do-hickey that had slid out of place because it was not originally wired open. Don't know if that had anything to do with it or not.

Maybe there's something stupidly obvious here that someone can tell me. I'm at a loss right now. Any help would be appreciated.

Thanks!
Kevin

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gil russell

08-20-2004 07:13:17




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 Re: 188D injection pump timing help.....long in reply to Kevin, 08-04-2003 18:10:17  
I have the same problem



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Ryan

08-05-2003 20:13:52




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 Re: 188D injection pump timing help.....long in reply to Kevin, 08-04-2003 18:10:17  
I just did one on a 530 and you sound like you are doing fine. Are you sure that you were at 8 degrees on the compression stroke and not on the exhaust stroke? That will put you 180 degrees out of time. Otherwise at 8 BTDC the pump lines should match adn that is it. Let me know if that was the problem.



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Kevin

08-06-2003 18:54:16




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 Re: Re: 188D injection pump timing help.....long in reply to Ryan, 08-05-2003 20:13:52  
Well, found the problem, and didn't have to split the tractor. :>) Sure kept looking like it was 90 degrees out of phase on the pump shaft end with respect to the mating part inside the pump. So I pulled the removeable cover that covers the pump gear/shaft. And there was the problem. My pointers on the idlers were no longer matching up. It matched one point on the cam gear, but was somehow (!!!) 90 degrees out on the pump drive gear. Unless there are two sets of timing marks on the camshaft, I sure have no idea how that happened. I KNOW I saw 'em lined up before. Anyway, lined 'em back up like they should be and pump timed right up. I am thankful for a simple fix.

Also, stopped by the pump shop and had them take a look at my pump since I didn't wire it wide open when I removed. They said something about flyweights can get positioned incorrectly because of that, and that can grenade the pump. In 10 minutes they had checked it out and had me on my way. Figured it was good insurance against destroying a $$$$$$$$ pump.

Should have this puppy running by the weekend.

Thanks,
Kevin

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