Engine/Transmission (1994 - 1998) Timing Question

[JGheen]

I am sure this has been asked before and maybe someone could point me to the thread that asked it before, but how can the injection timing slip and get out of adjustment?? I am running the 215 pump w/13. 5* and I haven't had it checked since I did the "spill port" method back when I first got the thing. I have close to about 140,000 or 150,000 miles on the engine(not sure since my speedo and odometer were never recalibrated when I lifted the truck and put bigger tires on it) and like I said haven't checked it since. Just wondering what would cause it to retard/loose timing? Could it ever advance itself out of adjustment?? I want to step it up to at least 15*, but wanted some more info as to how it could slip out of it's set timing.



Thanks, Joe

 

[SRadke]

The injector pump gear sits on a taper on the injector pump shaft. To adjust the timing you loosen the nut that holds it on, pop the gear off the taper, adjust to the desired timing and tighten the nut to push the gear back on the taper. This taper method give unlimited timing setpoint options but if there was dirt or contaminants on the taper or if you didn't get the nut torqued properly the load of the injector pump may cause the gear to slip slightly backward on the taper, thus retarding the timing.



-Scott

 

[JGheen]

I see. But it could never advance itself due to the rotation of the gear?

Does that timing adjustment method require removing the timing cover?? That method is different than setting the plunger lift method, right?

 

[SRadke]

The load of the pump on the gear will always cause the timing to retard if it slips.



The oil fill tube can be removed from the timing cover to allow access to the pump nut. No, the timing cover does not have to come off.



"setting the plunger lift method"? Not sure what you mean here. To change the timing you must loosen the gear, turn it and retighten. As far as I know there is no way around that. I did mine using a dial indicator on the plunger in the #1 hole as my indicator but I believe there is another option? Perhaps someone will help us out.



-Scott

 

[edmeyers]

Here is the thread that talks about timing



https://www.turbodieselregister.com/forums/showthread.php?threadid=96154



i just had fulmer set min to about 15. 5 and he uses a much easier method but i not sure where its posted where you use the balancer and measure around the diameter and once the gear is off the pump shaft rotate the engine to the desired timing

 

[JGheen]

Originally posted by SRadke

The load of the pump on the gear will always cause the timing to retard if it slips.



The oil fill tube can be removed from the timing cover to allow access to the pump nut. No, the timing cover does not have to come off.



"setting the plunger lift method"? Not sure what you mean here. To change the timing you must loosen the gear, turn it and retighten. As far as I know there is no way around that. I did mine using a dial indicator on the plunger in the #1 hole as my indicator but I believe there is another option? Perhaps someone will help us out.



-Scott

Maybe I was thinking of the method you described, I though I read somewhere that you do not have to adjust the gear and that you can set the plunger lift another way. Don't mind that thought just me thinking out loud.



I understand now though about using the dial indicator on the plunger to check the lift for the correct timing once you have adjusted the gear.



BTW, how far can the timing retard if it gets out of adjustment?? Far enough to detnate and melt a piston?

 

[Jim Fulmer]

BTW, how far can the timing retard if it gets out of adjustment?? Far enough to detnate and melt a piston?



How about almost a half of a round on the crank and not being able to get over 1100 RPM..... I like new pump washers now!



Jim

 

[JGheen]

Originally posted by Jim Fulmer

BTW, how far can the timing retard if it gets out of adjustment?? Far enough to detnate and melt a piston?



How about almost a half of a round on the crank and not being able to get over 1100 RPM..... I like new pump washers now!



Jim

That would really suck!!:--) What do you mean you like new pump washers... . did you have yours slip because you re-used the same washers that were on there before??

 

[Jim Fulmer]

On the Race pumps they just take so much power that if things aren't right it will slip, remember they pump almost 4 times the fuel of a stock pump. So Piers's method of every other time change the washer I adapt to all trucks without any issues, If I change the timing for the first time I put a new washer on it, today I ordered 10 just to have, but I play with timing some on my truck too with various other changes and see what it likes.



Jim