03 valve adjustment procedure

[Not_Agn]

I was plannign on adjusting my vavles just to have that out of the way. Took the valve cover off, went to set it at tdc. I have turned the motor over to get it close. The question I have is what do you line the mark on the harmonic balancer up to? The Pick up? I don't see anything else that it would line up to. Also I have seen on the older cummins they have a timing pin. I don't see that the new one does unless I am over looking it. Any immediate help so that I can put this thing back together would be great. Thanks in advance. Lee.

 

[jwilliams3]

Lee,

Line up TDC mark with the center bolt on the gear case cover.

Also the TDC will show up twice, once at true tdc and once at 180 out.

@ 180 you can adjust the #6 cylinder. @ TDC you can adjust the #1 cylinder.

 

[bpenrod]

Is a valve adjustment really needed at 24,000 miles? If so i better get on it!

 

[Tony T.]

Originally posted by bpenrod

Is a valve adjustment really needed at 24,000 miles? If so i better get on it!

According to the 03 Owners Manual it's not. My understanding was around 150,000 unless I'm missings something.

 

[nickleinonen]

Originally posted by Tony T.

According to the 03 Owners Manual it's not. My understanding was around 150,000 unless I'm missings something.

but how close did the factory get it to the tight end of the spec?

 

[Not_Agn]

I didn't have to adjust one of them. The rest were a little loose. With a couple of them that were a little looser then the rest. At least I know where they are. Seems a little quieter and a smoother Idle.

 

[Briman]

Ok Vaughn, tell them it's just an average HO unless the valves are adjusted at 25K.

 

[Vaughn MacKenzie]

Originally posted by Briman

Ok Vaughn, tell them it's just an average HO unless the valves are adjusted at 25K.

Briman's right, average Joe HO unless a 25K valve adjustment procedure has been executed



I did mine around 20K, they were pretty darn close, but I tightened them up a skosh to . 080" intake and . 18" exhaust.



Vaughn

 

[Briman]

I'll be doing mine at 25K.

 

[radar doctor]

Loose check

Question, If there too tight does this mean its hard to start?? Will it run better if the values are left a bit loose?? tks

 

[Prairie Dog]

It will not run as well if they're a bit loose, it will rattle and have more of a buzz at idle. It's essentially like having a more mild cam when it comes to performance. Tightening them up has just the opposite effect. If you get them too tight they may not close completely when she gets hot and the valves will burn because they never get a chance to seat and "heat-sink".