Sounds a little childish? One man posts his advice/experience. Dont like it, dont follow it why argue? This reminds me of a picture I once saw. It said "arguing on the internet is like running in the special olympics, even if you win your still retarded". Not trying to offend anyone but it makes sense.

 

Sent you a P.M if you want to post some or all of my reply go for it.If not thats ok also.

 

I thought we were all on the same side

 

Wow, I haven't seen a debate like that one in a while . Oh, by the way, my dad can beat up both of your dad's...

 

When to do valves................ Anytime you have the time, patience, mechanical ability and enjoy wrenching on your truck. Remember their are a lot of trucks like mine, but this is my truck! Who cares how many miles or what the book says. I first checked mine at three months old, all within 1-2 thou. All this nonsense talk makes me want to check them this weekend. Why? Because I CAN!

 

I can't see how it's a good policy to assume the valves are fine just because of the type of oil you use. Always assume they are not fine and at least check them at the recommended mileages or sooner. If no adjustment needed then great. If it is needed, great, you caught a problem. I'm not about to override Cummins recommendation and drive on for 150,000, 250,000 miles, or whatever and be at peace just because of heresay or the brand of oil I use. And how silly to argue that they don't need adjustment when the only way to know is if you check them. Get the feeler gauge out and find out. Then report your findings.

Wetspirit

 

[QUOTE=flipper-26;1171947].... Besides I find it when valve lash is out of tolerance you know it by detonation in the cylinder or cylinder running to rich.
You know a diesel won't run without detonation, right?
(Due to exhaust and intake valves not opening and or closing properly) ...


As far as those clearnces stated in the previous post I can definitely understand the performance loss of the engine with those clearances, but did the enginge blow up? The valves were opening and closing, you just did not have the scavaging effect.
The scavenging effect is determined not by valve lash values, rather by the duration and overlap specs of the camshaft. True, the lash does determine the acutal lift of the valve from the seat, and this does affect the amount of flow, but only incrementally.
The key to checking valve lash is to make sure the valves open and close within those tolerances to make sure that effective scavaging is taking place within the combustion cycle. In the event of scavaging the intake valves are open longer than the exhaust valves.(this is why the valve lash of the exhaust valve higher than than the valve lash of the intake valve so that the clean intake air can push out all burn and non-burnalble gases into the atmosphere.

The purpose of the valve lash values is to attempt to control the valves as close as possible to the specs of the camshaft design. In theory, if a motor did not have expansion and contraction due to heat and cooling cycles, you would only need minimal valve lash(clearance) and the valves would be able to lift with the speed, amount, and overlap that is determined by the camshaft specs. In the real world, the lash(clearance) is designed to allow for heat expansion so the clearance will not get too tight. Valves that are too tight do not close and therefore the seat and valve will be burned by the superhot gasses jetting through the small opening at the seat. Engines that are over-revved frequently will develop tight valves and can burn the valves and seats. Loose valves will be noisy, but will have minimal effect on engine performance. ...QUOTE]

Just my .02 FWIW

 

my coffee almost bathed my screen reading that !!! LOL