What for pump timing are you guys running?

[EZeis]

Hello everyone!



I check my pump timing Sunday while running the valves and was surpised at my pump setting. Stock spec is 1. 25MM and mines at 1. 35MM. I'm the second owner of this truck and the guy had the pump replaced not very long before I bought the truck and the guy said the truck had more power after the new pump then it ever had new. So the shop that replaced the pump, advanced the timing when they installed it. I'm thinking they set it to 1. 40MM seeing as that is the closest thing I can figure and it dropped a bit for normal wear. Anyways, the truck is my daily driver, all stock, or at least I thought the timing was stock. I tow my travel trailer with it a good bit and it's about 8,000 pounds. What would you guys recommond I do? Keep it there, bring it up to 1. 40MM? Or go higher? I'd like to add that I want to get another 300k out of the truck and hold onto my 22MPG or close to it. Also in the near future, I want to install Bosch 190 40HP upgrade injectors, 16CM turbo housing, 4" exhaust, and upgrade the air intake system. But for right now, she's bone stock but the already advanced timing. I tried to get info from the history, but it's confusing. Some talk MM's and some talk degs. Degs doesn't help me. I have the correct tool for setting pump timing in MM's.



Also, now that I think about it. At about 2200 to 2400 RPM I get nozzle knock, power knock, or whatever it's called. I'm thinking my injectors are worn, seeing as they are OEM with 303k on them. I started running Lucus fuel treatment and that made it alot quieter (which makes me think injectors even more), but didn't take it all away. Below and above 2200 to 2400 RPM it's fine. I have no tach yet, so I'm figuring RPM through road speed.



Look forward to hearing from you guys. Thanks!



Earl

 

[dpuckett]

Mine is up around 1. 7mm 0. 3mm over stock. I also have a few upgrades, though my EDM injectors pop at stock pressure- 3550psi. I see no reason not to- you wont damage the engine with the relatively low power output, and if you dont like it, you can move the pump back.



You checked the timing, but did you verify TDC by means other than the timing pin? They have been known to be inaccurate. If you are getting 22mpg, I might get the injectors checked- they could be popping a little low, though I doubt there is too much wrong with them. JLEONARD may beg to differ, though. He averages 22mpg in town in winter, I think. With my newly redone EDMs, new pump refresh, I get 21-22mpg hwy, and I have 4. 10s.



Daniel

 

[EZeis]

:--) I wouldn't complain if I got more fuel mileage at all! Thanks for the info Daniel. Yeah, I know about the timing pin deals. What ever happen to timing marks on the crank, too easy?? lol But it was so hot out and I wanted to get it done Not to worry though, I will find true TDC. I got the procedure in my OEM service manual or in my Cummins service manual. I'm sure the timing pin housing gasket is ready to be replaced anyways. Do you use true TDC everytime, or do you adjust your timing pin to true TDC and trust the pin there after? Thanks again!



Earl

 

[Greenleaf]

Here is my . 02



Timing pin and true TDC... . Bah Humbug



Remove/throw out the timing pin and all thought of using any method to locate it. To adjust pump timing I use sound. To adjust valve lash and R&R valve springs I note the location of the valve and the "feel" of the engine as I slowly rotate any given piston up to TDC.



These engines are so well engineered that they are deamed very simple when you stand back and think about things.



Sounds dumb but it works well for me and the (5. 9) engines I work on.



Scott

 

[cerberusiam]

Timing pin and true TDC... . Bah Humbug

LMAO!!! :-laf :-laf