Timing Advance?

[Forrest Nearing]

better economy, better burn (lower EGT's) at higher RPM

 

[Tippin Spotted Cow]

Jimmy, turning it up too much will cause there to be too much cylinder pressure, which will in turn end up testing out the integrity of your stock head gasket. I would imagine there comes a point where you would also either a) develop a knock like gassers do with too low of octane/too much compression or b) actually end up spraying the fuel in before the air is compressed enough to heat and burn the fuel. I would imagine the both of them are extremes and might not even be achiveable with the slotted holes in the pump mounting flange. I would ventue to guess both cases would ultimately just cause the motor to not run until timing is brought back a little.



I keep tellin myself I'm gonna do mine as soon as I get a chance, but I've been spending a lot of time with the woman lately.



Whats going on with this fourth screw that locks the thing in place, where is that guy at?

 

[JGrefenstette]

i took a quick peek at it yesterday. i think its on the rear of the pump hear the injector lines, it looked like it was a small braket that bolts to the pump, and to the block.

 

[PToombs]

Matt, next thing is we'll all be wondering where you've been. She'll be keeping you right under where she can see you! :-laf

 

[Tippin Spotted Cow]

Well I do spend a lot of time under her... but thats a different story.



No, shes pretty cool actually, for a girl anyway. Shes actually some class A or something certified mechanic. Went to school and got a degree for it. Worked as a mechanic for a while until she realized that none of the customers took the cute little thing running around in a greasy jump suit seriously and switched professions to be a recruiter. She still crawls around under my truck with me once in a while... but once again, thats a different story...

 

[DValentine]

Are we still talking about pumps?

 

[DieselNasty]

Kinda sorta lol, just waiting for some answers for guys that know all this good stuff.

 

[Tippin Spotted Cow]

So I've heard, some trucks came stock with a little different timing than others, causing that 1/8" rule to not be entirely accurate. How you tell these trucks apart, Im not sure. I would, however, place my money on non-i/c vs i/c trucks. Something to watch for though. Let me know how the plunger lift turns out when you check it, I'd be curious to test my theory.

 

[DieselNasty]

Yes I heard the non I/C have more timing then the I/C but you can look on the tag on the side of your engine to get the spec.

 

[JLEONARD]

Yes... the non I/C engines have more advance... 1. 4 (deg?) as I recall.

I recall that when the I/C enginnes do the 1/8 advance they are at 1. 45?

(so... how can the earlier engines be more advanced? Is this an oxymoron or a play on words??????

Can anyone verify that number??

That's why I have never advanced mine.

Being non I/Cd and all.

I like to live inthe 80s... . lol

 

[PToombs]

I moved mine about the 1/8th. When I checked it later, it was at 1. 65.



Dave, you know you'd be disappointed if we stuck with the subject of the thread! :-laf

 

[DieselNasty]

So I did some more searching on here and found that the little plug in between all the lines is where the dial indicator goes in, correct? I was also looking at how hard it is to find true TDC on these and seems like the valve drop method is the best and the timing pin is pretty close.

 

[PToombs]

Valve drop is best. The pin could be off a lot. Some are, some aren't. The pin isn't as accurate either.

 

[JGrefenstette]

are yall saying that the best way to check tdc when doing a valve adjustment is to just look at the valve drop? i guess it would be way to much work to pull an injector and use a pen light. hmmm, so is this the way its suggested to do a valve job? i never really thought about how to check tdc on these motors.

 

[JLEONARD]

 best way to check tdc when doing a valve adjustment is to just look at the valve drop

When adjusting the rocker arm clearance it is not really critical to find exact TDC

 

[Mel Fuelling]

My work truck static timing pin was a little off, but almost impossible to make

practical use of. I found tdc with a dial indicator with #1 injector out and marked the crankshaft dampener for future reference. I am not sure that the

dampener won't slip and spoil my reference though.





My experience with pump timing adjustment has been positive. I used the VE pump adapter and borrowed the hard to find correct sized dial indicator to adjust my pump timing from 1. 25mm to about 1. 55mm. This took some low end away, but made it rpm quicker or more freely above 2,500 rpm. This trucks fast idle is set to 3,100rpm, but will start defueling at 2,900. Advancing the pump timing really woke it up above 2,500 and losing some

bottom end should be easier on the Getrag and drivetrain. This is in a D350

that I work out of that weighs about 9,200# every day, hooks onto a small to medium sized trailer ocassionally, and gets 19-20mpg on summer fuel if I

don't drive over 65mph.

 

[PToombs]

Jimmy, at work we have a jig, the guys at SOP saw it. It bolts to the valve cover bolt, (with the cover off) and pushes the valve down. You put this on, roll the engine up until it hits the valve, mark the balancer at a known point. (install a pointer or something) Roll it down a little, pull it off. Roll the engine past TDC, put the jig back on, roll the engine backwards til it hits the valve. Mark the balancer. Pull the jig, measure between the marks, put a new mark exactly 1/2 way. This is TDC.

You can do this by tightening the valve down, but it's not as accurate.

 

[DValentine]

"Dave, you know you'd be disappointed if we stuck with the subject of the thread! "

It just makes me smile. I am that way in life, struggle with ADD. I try to overcome it... with little results. It makes for interesting conversations with the wife. Sometimes she gets mad.

D

 

[PToombs]

Me, I'm just hyper. Oo. My wife gets mad too. Usually when we talk about money for truck parts.

 

[JQuam]

I thought that only happened at my house!!!:{LOL!!