Injection Pump Installation after working the crank
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Joined: Aug 2003
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Injection Pump Installation after working the crank
I am in the process of replacing a bad valve and piston, while working on this I have the injection pump off and am turning the crank in order to access the connecting rod bolts. What am I going to have to do in order to get the injection pump back on and in time. Does the injection pump drive gear and alignment dowel turn correspondingly with the crank, if so will I just be able to put it right back on and line up the orginal marks? I ask all this because when I took it off to have it rebuilt I remember the mechanic at the shop telling me not to crank the motor while it was off.
Posting Guru
Joined: Oct 2003
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From: Monroe, WA
I take it you left the gear and aluminum cover on the block right? If you turn the motor over the gear is just flopping around inside and it will actually start grinding metal shavings off the sides of the block, not to mention probably jump time.
Posting Guru
Joined: Sep 2002
Posts: 1,897
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From: Northeastern Pa - USA
The pump is driven by a gear train. It is possible for the gears to jump time while the engine is on a stand and upside down. If you left the final drive gear on the engine when you removed the injection pump, you stand a good chance the timing will stay correct and ;all you have to do is reinstall the pump to the tower. The pump has a dowel hole that will line up with the final drive gear and you will have to fine tune it (align the timing marks) after installation. If you want to be sure of the timing, remove the front cover and check the alignment marks on the gears. Good luck and keep us posted.
Posting Guru
Joined: Oct 2003
Posts: 2,438
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From: Monroe, WA
You are probably alright, the gear will just roll around with the motor. If you get it together and it runs awful, get the timing checked. I had a guy that got the pump 180* off and it still ran, just very poorly. Had about half power and it smoked black all the time. 
