Valve lash adjustment

[fpchief]

I am working on getting everything ready to do a valve adjustment and not sure i understand where to start at. The manual states rotate until 1/16" past the lds-465-1 mark toward the other marks. Mine is a LDT-465-C and just want to make sure i am where it needs to be to start on #1 intake. two attachments...

 

[Big Tom]

This should help out very simple

Big Tom

 

[sandcobra164]

Look in the manual to find the valve lash specifications, read this old school advice to figure out which valves to adjust. All 4 cycle 6 cylinder diesel engines I have ever messed with are adjusted by looking at thier companion cylinders. They are always 1-6, 2-5, 3-4. Always add to 7. If you want to adjust the valves on cylinder 1, look to cylinder 6 to see if a valve is pushed down. Doesn't matter intake or exhaust, you know number 1 is on it's power stroke and the valves are free.

 

[Aussie Bloke]

G'day everyone,....



When doing valve gaps/adjustments I've always made sure the lobe was pointing UP and then simply check your gap and adjust as needed.

Works every time for me.



Aussie.

 

[fpchief]

G'day everyone,....




When doing valve gaps/adjustments I've always made sure the lobe was pointing UP and then simply check your gap and adjust as needed.

Works every time for me.



Aussie.

Do just speakinh about all valves in general, if say #2 valve is it fully closed it is ok to adjust even if it is 180 degrees out from it's actual power stroke?

 

[ken]

Do just speakinh about all valves in general, if say #2 valve is it fully closed it is ok to adjust even if it is 180 degrees out from it's actual power stroke?

Yes, As long as the cam lobe is 180 deg from the rocker arm, you can.

 

[Aussie Bloke]

G'day everyone,....

Do just speakinh about all valves in general, if say #2 valve is it fully closed it is ok to adjust even if it is 180 degrees out from it's actual power stroke?

Anytime the lobe is pointed upwards there should be the least amount of pressure on the valve stem and the valve should seal.

So on any valve you are going to check/adjust make sure the lobe is pointed upwards.

Inlet and exhaust gaps will be different.




Aussie.

 

[WillWagner]

^^^no^^. If the cam lobe is facing upwards, what is happening in cylinder? The lobe is pushing the tappet up which is pushing the push rod up which in turn is pushing the nose of the rocker down, opening the valve. There will be zero lash and maximum pressure on all of the valve train components on that valve. Lash will be impossible to set. On a non overhead cam engine, the cam lobe is normally 180 degrees from the tappet contact point on the cam when performing a valve adjustment.

What you have described is normal cam position for an overhead cam with buckets over the valves.

 

[Aussie Bloke]

G'day everyone,.....

What you have described is normal cam position for an overhead cam with buckets over the valves.

Yes, I was describing an OHC system, my bad, force of habit as that's what I have mostly worked on.

So, in the case of a pushrod system I rotate the engine until the pushrod/tappet reaches its LOWEST point and that's when I'd check the gaps and make adjustments as needed!





Aussie.

 

[WillWagner]

Motorcycles and I don't know what cars use that set up.