Z22 Interference or Non?

[rudolfgreen]

Searched the forums without a straight answer.. is the Z22 Interference or Non-Interference? Thanks.

[hang_510]

interference.

based soley on the one i tore down...

[rudolfgreen]

interference.

based soley on the one i tore down...

 

Baaaaa! I just replaced the head gasket 5k ago.

[hang_510]

:huh: did it slip a tooth or something???

 

compression check out?

[rudolfgreen]

Nah, still running fine..just has developed a racket. My lady (its her truck) took it to a mechanic that has done work for her in the past and he pulled out a piece of the chain guide (drivers side). The tensioner is all the way in and there is still some slop in the chain, although intact.

[datzenmike]

Turn the motor clockwise and all the slack will move to the passenger side as the crank sprocket pulls down on the driver's side of the chain. If the Teflon or whatever plastic is off it ain't going to get any better. That guide set needs changing. The chain is going to chew into that guide over time. It's never going to get quiet.

[rudolfgreen]

Check this out. pulled up from the the chain well. the noise is gone. ;) is that the whole thing?

 

[datzenmike]

Looks like the guide is snapped off. It's the top long straight guide below the KA24E timing set lettering in white. Its for a Z24 but only the chain length is different from the Z22.

 

 

 

 

 

 

.

[rudolfgreen]

Right on.. nice visual. So non-interference for sure?

[jesusno2]

i busted a chain in a 720 i had once non interference motor 100% + on that 22r toyotas are non interference also :rolleyes: just in case ya wanted to know lol broken a few of those too :lol:

[datzenmike]

Non interference???? This usually refers to the valves at full lift not physically being able to hit the piston top at TDC. An interference motor that breaks a timing belt or chain risks an open valve hitting a piston and being bent or damaging the piston, or both.. Pretty sure the L and Z series are interference motors. Larger valves and higher lift cams make this even more so.

[rudolfgreen]

Oddly enough, I had a mistype and actually meant that it IS an interference motor (ie:self destructs if the timing chain/belt breaks).. but I have heard from multiple people that the Z22 is a NON-interference motor, so hence my confusion. I am going to start tearing her down anyways, but appreciate all of the input..

[hang_510]

the answer:

the L and Z series are interference motors.

 

 

 

are you rebuilding?

 

the chain guides could be replaced w/o pulling the head/motor

 

 

my L20b went ~25K w/a wasted timing set.

huge mess when i eventually pulled it, but it ran fine

[rudolfgreen]

Not tearing her down totally..just the timing cover r/r route.. thanks though

[Yinzer]

Sooooooo.... IS or IS NOT the Z24 and Interference engine ?

 

I've read in cases were people tore them down and claim it IS and IS NOT ?

 

WHAT IS IT ??? Post pics as evidence please.

 

TIA

[datzenmike]

You mean that if the timing chain should snap will open valves hit the piston tops? Definitely and with disastrous results. Just take any Z head and turn the cam. I don't know about the exhaust valves but the larger diameter intakes will lift well above the head surface.