what should valve lash be

[TBurow]

the book i have says . 010 and . 020 for cold lash, is this right?

 

[AlK]

That is correct.

Intake . 010

exhaust . 020

 

[moparguy]

Someone check me on this, but I've read the Cummins spec and it's 6 and 15 thou (min. acceptable). I usually go with about 8 and 16. It a bit quiter and in theory at least, you pick up some performance.



I do check once a year or 25k miles. Set the exhaust too tight and you'll burn a valve.



RR



Added in edit; the above is not to contradict 10 and 20. That is the spec on the CPL plate and the Dodge spec. I listed what Cummins shows as the miminum acceptable spec for 5. 9's.

 

[dpuckett]

I have done mine at 9 and 19 for the last couple years. Seems to have picked up a little pep, and lowered cooldown time a little. The difference isnt earth shattering, but still noticeable if one has gauges.



I will confer, though, book recommends 10 and 20.



Daniel

 

[cerberusiam]

Someone check me on this, but I've read the Cummins spec and it's 6 and 15 thou (min. acceptable). I usually go with about 8 and 16. It a bit quiter and in theory at least, you pick up some performance.

Thats pushing it at a cold setting. Hot minimum maybe?



!0 and 20 is what the 5. 9 manual and the FSM I have says. I usually go 9and 19 also.

 

[bgilbert]

I've been doing . 08/. 18 as per Pastor Bob. I don't know about cooldown, the new 91. 5 auto takes FOREVER too cool to 300*. I'm thinkin junk Autometer z-series gauge, since it never reads zero, it will bottom out at ~75* engine cold, outside temps 50*... hmm maybe this winter it will go to zero.

 

[Cummins Thunder]

I've been doing . 08/. 18 as per Pastor Bob. I don't know about cooldown, the new 91. 5 auto takes FOREVER too cool to 300*. I'm thinkin junk Autometer z-series gauge, since it never reads zero, it will bottom out at ~75* engine cold, outside temps 50*... hmm maybe this winter it will go to zero.

The gauge is approximately 25 degrees off, and you call it junk

Seems more like a safety feature to me.



CJ

 

[bgilbert]

Yep I do call it junk, as with a few other Autometer z-series gauges I've yanked out and installed el cheapo replacements- water temp and oil pressure. Maybe it's just me.

... hmm maybe this winter it will go to zero.

If you notice, I started to think for a second that DUH, it's reading ~75* because thats about what the temp is!! And since it was 98* 12 hours earlier when I parked the truck it might still be reading warm... so maybe this Autometer gauge is a good one. The crew cab will receive all Isspro, though.

 

[MMeier]

 

[Ggg]

I've been doing . 08/. 18 as per Pastor Bob. .

Man that is some BIG valve lash.

 

[dpuckett]

that's what I was thinking. I think he left out a zero. Though my two TX trucks were at about . 017 and . 027 (. 025 had some wiggle room).



Daniel