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Valve Lash Adjustment


dorkweed

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Finally got around to getting it done today.  What an effing PITA!!!!  Valve bank 4 is sort of under the cowl and ,5 and 6 are totally under the cowl and you need to be part monkey to get at them with wrenches and feeler gauges!!! :duh:  :2cents:

 

Only have 215,486 miles on MightyWhitey and it's the first time done on her.  None were crazy out of whack, but some were tight and some were loose.  I turned the engine over using a socket on the alternator bolt.  Only drew blood on one finger during the whole ordeal.

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Should my truck sound/feel different after doing this????

 

I think I'm noticing smoother/more even acceleration....................and a bit less noise at idle.

 

Or is it from working the snot/blowing the carbon out of her on my NoDak trip???

 

 

Did this after NoDak trip also.

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  • 6 months later...
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It shouldnt' feel different, but you are twice the reccommended adjustment interval. Even thou Cummins says 100K miles I do mine more often and even then it made small feel differences.

What did you set the to? Many people set the exhaust to 0.018" to get a little more exhaust out on HPCRs due to the short duration on the OEM cam. It can increase drive pressure a little, but from how I gather you use your truck it wouldnit be an issue on DP but maybe a little more spool/performance for free.

Did you adjust them all or just if they where out of spec?

How close are you to an oil change? My silicone always goes up after a valve lash since it is very hard to keep the dust off the valve train.

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My silicone always goes up after a valve lash since it is very hard to keep the dust off the valve train.

 

I yanked out all that nasty matting on the cowl.

 

Just for fun. I just got done doing valve adjustment on a old 70's Datsun engine tonight.

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It shouldnt' feel different, but you are twice the reccommended adjustment interval. Even thou Cummins says 100K miles I do mine more often and even then it made small feel differences.

What did you set the to? Many people set the exhaust to 0.018" to get a little more exhaust out on HPCRs due to the short duration on the OEM cam. It can increase drive pressure a little, but from how I gather you use your truck it wouldnit be an issue on DP but maybe a little more spool/performance for free.

Did you adjust them all or just if they where out of spec?

How close are you to an oil change? My silicone always goes up after a valve lash since it is very hard to keep the dust off the valve train.

 

 

I did adjust them all.  As I said, some were "loose" and some were "tight".  I did the .020 and .010 exhaust and intake for my '04.5.

 

None were crazy loose or crazy tight.  Maybe just the fact that I did something to my Cummins made my "rear-end" hyper-sensitive!!!  The SOP-meter was pegged!!! :thumb1:  :ashamed:

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  • 2 weeks later...

I just did the adjustments on my 01 a few weeks ago. It had about 60k on it since the last time it was done and the difference was very noticible. Most of the valves were about 4-6 thousanths loose!! Maybe it is just because its a noisy 24 valve, but just the sound difference was huge for me.

 

On this note, does anyone have the valve specs for a 1992 era chevy 305CID motor? I am getting ready to change the valve cover gaskets and with over 260k on it, it is probably time!!

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