Piston to Valve Clearance with vtec locked in

[Beastcivic]

Hey Guys

Anybody know how to lock the vtec pins in, so I can measure my piston to valve clearance? I'm having alot of trouble doing this :(

Thanks

[BseriesPLZ]

Arent honda engines inteference , so the "clearance" is actually negative (at full compression) ?
IE when your timing belt snaps it invaribly smashes pistons and valves

[CRXer]

Why would u have to?

Locking pin gives a fixed clearance relative to the low rockers,if the small ones are right then the high rockers will be right.

The only way to lock the pins would be with compressed air into the solenoid valve & ud prob only wanna do this to check the pins are actually locking.

[weezer]

Here's a good how-to article

http://www.c-speedracing.com/howto/claymotor/clay.php

[aaronng]

Arent honda engines inteference , so the "clearance" is actually negative (at full compression) ?
IE when your timing belt snaps it invaribly smashes pistons and valves
That's right. :thumbsup:

[ECU-MAN]

you have to undo the bolt that is on the front of the head on the left hand side.

you can make your own VTEC air bleed tool, the idea is to pump compressed air in that hole, then their is another tool that you have to use to block a hole in the head that passes the air to the lock pins.

set each cylinder to TDC and test them one at a time

[Beastcivic]

Good responses from everyone, lets keep this going cause I and I'm sure other's are learning a great deal from this.


you have to undo the bolt that is on the front of the head on the left hand side.

you can make your own VTEC air bleed tool, the idea is to pump compressed air in that hole, then their is another tool that you have to use to block a hole in the head that passes the air to the lock pins.

set each cylinder to TDC and test them one at a time


I've undone that bolt and treaded a brass nip on it so I can feed air into it, and have also block off the hole in the vtec solonoid, However it doesn't seem to build enough pressure to push the pin's in? Maybe my compressor is too small?

[ECU-MAN]

you do not touch the VTEC solenoid

you use a tool to block a hole in the head


is it SOHC or DOHC

also you need at least 30 to 40 psi to lock the pin

[Beastcivic]

Hey dude,

My compressor can pump 80psi, but it's not locking the pins in :(. Its a SOHC D16y8. I don't know what I have to block off? And what does the tool look like?

[ECU-MAN]

tool looks like a pair of plires.

do you have a service manual for your engine.

the procedure is in the manual

[Beastcivic]

Yeah I do have the Haynes manual but It says nothing. I got the service manual on CD and now I know what to do, Im just gonna make something tommorow to block the hole. Thanks for all your replys

[ECU-MAN]

good luck with it

remember to set the cylinder your testing to TDC then apply the air, then rotate to test clearence