450C Injection Pump and Timing question

[cpederslie]

First of all thanks to all that answered my first post regading stalling out and injection pump problems. I determined my pump was bad and sent it out for rebuild.

I got the new pump back and installed on the machine following the JD tech manual. I've got everything bled but it wont't fire. I'm begining to think I've got the timing off and maybe misunderstood what the tech manual procedure was. So, figured I'd run it by the forum for a sanity check.

Here's what I think my problem is. I didn't verify #1 cylinder was on compression stroke. All I did was insert the timing pin at the flywheel and bumped it over until it slid into the flywheel. Based on the tech manual this should be top dead center. Or is there multiple holes on the flywheel that the timing pin slides into?

What is the easiest way to verify top dead center? If my timing is off I'll need to pull the pump and re set engine timing then re-install pump.

Based on the tech manual as long as the governer and cam ring timing marks are lined up on the injection pump it is in time. Is that a correct assumption? I should be able to make sure they are lined up, pull the pump, get engine to top dead center re-install the pump and re-bleed the system?

Anything else? Any help is greatly appreciated. Thank you in advance!

Chad

[pdmech08]

By inserting the pin you have only brought #1 to TDC. Now you must determine if it is at TDC on the compression stroke or at TDC on the exhaust stroke. (must be TDC compression) The easiest way to do this is by pulling the valve cover and checking to see that both valves for #1 are closed. Once you have verified that, then the marks in the little window of the pump need to line up as well.

[RANDY Fay]

Heres what i would do if i was called on this service call to get this machine running--be sure fuel system was bleed out and pumped up until manual prime pump don't pump any more (lever just seems to move freely)--loosen fuel lines at the injectors--crank eng. until presure fuel--not just a drible--almost a spray--comes out of loose inj. lines--at least two lines ttighten lines--crank eng you should start to see smoke out exh.move lever on prime pump to be sure it's still up to presure--crank eng again there should be alot of smoke and may even start--if it don't start loosen lines and go through the loosen line thing again after all that if it's not running I would guess it's out of time--remove valve cover watch rocker arms while turning flywheel with screwdriver the rockers one #1 cyl will be setting still--the rockers on #4 cyl.will be right in the middle of one coming up and the other starting down when timing pin goes in this is top dead #1 check pump timing mark an correct as needed--go through whole thing again it should start have fun Randy

[jdemaris]

I got the new pump back and installed on the machine following the JD tech manual. I've got everything bled but it wont't fire. I'm begining to think I've got the timing off and maybe misunderstood what the tech manual procedure was.

The lines must line-up only when #1 is at TDC of the compression stroke -otherwise it won't run. Did you look closely at the pump driveshaft end and also the part it plugs into inside the drive-end of the pump? There's a dimple mark on each and the dimples must go against each other when you install the pump.

You can prime a pump before installing - it makes things go easier. Just stick a big screwdriver into the drive end, make sure the pump is energized with 12 volts, and use an oil can to squirt clean diesel into the inlet at the back of the pump. A tight connection is not needed - it will prime out just fine by turning slowly with the screwdriver. I prime all mine on the bench before installing.

When you get all done - you might want to stick a timing window on it and make sure the timing advance is where it ought to be - unless you trust the place that worked on the pump 100%.

Hopefully you've installed pumps before and know how easy it to flip over an umbrella shaft seal witout realizing it -and winding up with a crankcase full of diesel fuel?