I am changing my timing belt and adjusting my valves on my 3vze and the 4th ex valve has no clearance. i got a shim from another vehicle to put in just to measure the clearance. I think if i put a shim in with a thickness of 0.0866 then my valve lash would be in between 0.009 and 0.0013. unfortunately i believe this to be the last shim toyota sells, so after this last adjustment and so manny miles of driving my valve will start to burn again. should i replace the valve since i have torn into the engine this far?

 

This site https://parts.lakelandtoyota.com/showAssembly.aspx?ukey_assembly=515999&ukey_make=1 060&ukey_model=15426&modelYear=1994&ukey_category= 21646&ukey_driveLine=6747&ukey_trimLevel=18380 says the thinnest shim sold by Toyota is 2.25 (or for you folks in Liberia who still use inches, 0.089"). There is a discontinued shim, and judging by the part number it could have been a 2.20. The chart in the FSM suggests the same, and that chart translates 2.20 to 0.0866" Since you don't have a tool that can measure to that many decimal places, I'm guessing that's where you got that odd number.

But if you're changing the timing belt, you have a long way to go yet to get to the valve. While your disappearing valve clearance does suggest a burned valve, it could easily be accompanied by a burned valve seat. You'd need to replace both (or at least resurface the valve seat), and the valve seat is definitely a machine-shop job. Do you want to go that far? Or do you want to button it up, drive 100 miles, then recheck the clearance on #4 exhaust? (Hoping to get another couple thousand miles out of it.)

 

well i guess i could go with a 2.25 but that would give me .009 clearance. i think i found the discontinued shim for sale under part number 1375364010. thanks for your help
here is a link in case anyone wants what i believe to be the discontinued 2.20 shim
https://parts.bommaritotoyota.net/a/...302.html#13753

 

 

In spite of our backward ways, not because of them. Truth is, Americans stood on the moon thanks to the German scientists and engineers we recruited at WW IIs end.

 

To the point of this thread... Did you do a compression test before attempting valve lash adjustment???

If that cylinder still had acceptable compression pressure, restoring lash to spec will suffice.

If compression was low, probably nothing but a valve grind can restore it.

 

Triggered!

I know who used imperial on my truck. The dorks that installed a "side bar / nerf bar" POS in 1987. Front passenger tcase crossmember bolt. One. Must have lost the metric one. Threads fubared all to hell AND IT WASN'T EVEN MY FAULT! (I was 9)

 

Some engines with high miles suffer from what's called valve seat recession. That is why the clearance disappears. Eventually, you can burn a valve. I just did an exhaust valve adjustment on my daily driver Honda for this reason. if you can shim it into tolerance you should be OK for now.

 

i did do a compression test a while ago. i don't really remember the numbers, it couldn't have been more than 7 psi difference.