shimmy shimmy yah, shimmy yo, shimmy yay. - Toyota Nation Forum : Toyota Car and Truck Forums

bondobondo · 03-18-2002, 11:07 PM

can i get a wu - tang, wu-tang!!

ok seriously, who here can step up to the plate and break down the art and science of overhead cam valve bucket shimming.

DS - TTCC · 03-19-2002, 09:08 AM

As far as I know, shimming the overhead cam valve buckets is to make sure the cam lobe is touching the "top" of the valve. This means that the cam lobe is within so many thousandths of an inch away from the valve. The reason that you should do this is because if they are out of spec, you will hear a lot of head chatter (cams slapping valve shim) as well as you won't have the same EXACT cam spec. This is because the cam will move into the empty space, not moving the valve, so some lift will be lost. A by-product of head chatter is a possible pre-mature wear on the cam, also killing lift and duration.
As for the art and science, what you need to do is bolt down the cam with the lash caps, or cam mains or whatever you like to call the hold-downs, and then measure the cam-valve clearance with a feeler gauge. If it's out of spec (manufacturer spec) than add a shim. Also be sure the is SOME clearance or the valves might not be completely closed.
Is that what you wanted??

SpectraBlueCam · 03-21-2002, 12:17 AM

I don't have anything to contribute on the question posed, but just wanted to say that your post title is so ghey.

I think we'll have to give you "THE AWARD" for coming up with such a homosexual post title. :grin:

SpectraBlueCam · 03-21-2002, 01:39 AM

Hey Daks, you should photoshop in some mufflers and resonators for the juggling act. :grin:

DS - TTCC · 03-21-2002, 09:21 AM

Hey, keep it on topic!! We'll talk about that in the "OFF TOPIC" forum. Any questions at all about overhead cam shimming? Okay then...

bondobondo · 03-21-2002, 12:01 PM

as the co-moderator of this forum, i have to agree. take your pansy ass award and find a real recepient.