vasinvictor

iTrader: (3)

I have my junkyard 3vze on the engine stand. On the head side there were are 6 lifters that are not decompressing when right side up. However, when I turn the engine upside down, they all fall (decompress) and hit the cam like they should. Turn the eninge back over (right side up) and they fall. Is this normal for hydraulic lifters that have been sitting a while (I don't know how long) Makes it damn hard to get a compression reading on the cylinders!

BlackNite3

I don't think they are hydraulic. I think they are solid. I could be wrong. There should be a gap and it makes since that they would "fall" to the cam when upside down.

Again, I could be wrong...

fdp101452

There are no hydraulic lifters in a 3vz. Does it have valve springs in it?

Kingjerd

Something has been stripped off that motor.

vasinvictor

iTrader: (3)

vasinvictor

iTrader: (3)

Uh, thanks.

vasinvictor

iTrader: (3)

Looking through the exhaust ports, I can see that all but 1 intake valve is stuck open. I guess I finally get to try the "rope in the cylinder" trick.

scope103

The valve lifter is a bucket for the shim (the shim is what you see in the photos), and it just sits on top of the valve stem. The valve stem (powered by the valve spring) pushes the lifter up against the cam (actually, just short of it).

You can see a drawing here http://www.ncttora.com/fsm/1990-1995...e/cylinder.pdf (page EG2-62)

So, yes, you have at least 6 stuck valves. You say you got this engine from a junkyard? I wonder how it ended up there ....

vasinvictor

iTrader: (3)

Thank you, that was very helpful. I'll be heading to the machine shop next couple of days.

DeathCougar

iTrader: (23)

Just to reiterate, an overhead cam motor does NOT use a traditional lifter.

Lifters are used on push rod engines, to "lift" the push rod, and push on the rocker.

Just so there is no confusion

thook

But, they're still hydraulic, right?

DeathCougar

iTrader: (23)

They are anything you want them to be, sugarlips

thook

You really know how to say all the right things, CougyCakes..........

MudHippy

Somebody must have forgotten to tell Toyota that.


FYI, the more technically correct term would be cam follower.


Just so there is no confusion.
Nope, they sure ain't.

Maybe you're thinking of the competitor, the Pissan VG30i/VG30E 3.0L V6. I know for sure it has hydraulic lifters. Had to work on my sister's boyfriend's 95 Pathloser a few times...

vasinvictor

iTrader: (3)

I've said it before, but I wish I had your collection of illustrations on hand and easily findable! I've not seen the bottom one before. Taking the motor back to the junkyard from where it came. Valves stems are rusted bad, cylinder walls are scored, headgaskets were put on opposite side and block a coolant port, sediment and mud everywhere in coolant passages that motor. Junkyard=1, Drew=0

Leviticus6432

try craigslist rather than a junk yard lol

DeathCougar

iTrader: (23)

Regardless of what its called in the first pic, it is NOT a lifter. The ONLY function that cap serves is a guide for the shim.

It is NOT a lifter.

thook

@Mudhippy.........I was joking about the whole hydraulic thing. I know they're not hydraulic.

Note, CougyPoo did make the distinction "traditional" in his original post.

MudHippy

So I ran across an illustration in a Toyota Counter Reference Guide just a moment ago with some very relevant information on the subject. And I suddenly felt compelled to add on to my previous post, since there's somewhat of a discrepency.

Apparently Toyota is calling them bucket tappets now.


So we've got valve lifters, cam followers, or bucket tappets. Whichever you choose to call them, they're still the same thing.

Just so there is no confusion.

thook

Awful lotta thread space to clear the "confusion" that was already cleared, no?