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Ford 5550 Backhoe Injection Timing

S

s_hellested

New User
Can someone help me time the Mimec fuel pump on this 1973 4cyl engine. The manual I downloaded shows timing marks on the back side of the flywheel(very poor picture). My engine does not seem to have these marks. I brought engine to TDC #1 using valve overlap. There is no marks I can see and I rotated flywheel 360. So I lined up marks on inj pump to drive gear and reinstalled in same place. Engine starts and runs but you can tell it is off. I am a heavy truck mechanic and have removed and reinstalled many pumps on Cats, Cummins, Perkins etc engines. It's not rocket science. The manual says engine is timed at 19 degrees BTC. There does not seem to be a timing mark on flywheel in this general area either. If I have to I will time it by ear. There is no other marks that I can find to indicate a true TDC or timing point on the engine. Any suggestions?
 

You may be looking on the wrong surface of the flywheel some of them have a step there and you would expect to see them on a face but it is on an edge instead, or vice versa.
 
Unless someone intentionally ground them off, they are in fact there - I've never seen a Ford without the marks. Keep in mind that the marks go from 0-30 degrees BTDC, so you won't see anything immediately past TDC.

Find valve overlap on #4 cylinder. Turn the engine CCW until you find the marks. Keep going to about 30, then turn the engine CW and stop at 19. You are there.
 
Thanks for your replies guys. I will look again, especially along the edge. I have a few other problems with this tractor but will tackle and solve this first. Will let you know what I find out.
 

How do you determine TDC by valve overlap? To what level of accuracy; is it a degree or thousandth of an inch? I was trained to do it with a degree wheel and a dial indicator.

BTW, I've had that exact model and year of Ford since '89; those are strong mothers.
 
Valve overlap gets you approximate TDC- in the ballpark so to speak - and is close enough for valve adjustment purposes. Once there, a person can also find the actual timing marks for injection pump install.
 
I still could not find the timing marks. Maybe this is a reman engine. maybe the flywheel has been replaced. But they are not there. So I put a mark on the timing gear to pump, loosened the bolts up and backed (advanced) the gear in relation to the pump about 1/4". Engine started and ran great. I then moved it another 1/8" and it still runs good but has just a tad too much diesel knock. I will retard it just a little the next time I work on it and see how it does. Not the most accurate way to do it but I have had to do similar to other engines where the timing marks did not exist. Thanks for your help guys.
 
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