Valve to piston checking question

Posted By: 68hemiss

Valve to piston checking question - 08/09/14 08:03 PM

I have a question on checking valve to piston clearance with a hyd cam. Should I use a solid lifter when checking - won't the hyd lifter give a false reading - not being pumped up?

Posted By: SportF

Re: Valve to piston checking question - 08/09/14 09:11 PM

Use a solid lifter, or put a small washer in there to make it act like one. That will only work with a weak checking spring" though.

Posted By: robnbird

Re: Valve to piston checking question - 08/10/14 05:10 AM

Just use a solid lifter , that will be accurate enough

Posted By: MR_P_BODY

Re: Valve to piston checking question - 08/10/14 05:24 AM

Quote:

Use a solid lifter, or put a small washer in there to make it act like one. That will only work with a weak checking spring" though.

And take your reading at the valve to make sure it is
traveling the distance it should be.. if your using
adjustable rockers you can adjust the rocker to make
sure you are getting full lift... if the solid or
what ever you use is a different height you could
end up short on the lift

Posted By: ogopogo

Re: Valve to piston checking question - 08/10/14 08:39 AM

isnt it likely that the solid lifter will have a different pushrod cup height than the hyd lifter?
can you use a hydraulic lifter but make sure its full of oil?

Posted By: Cab_Burge

Re: Valve to piston checking question - 08/10/14 09:17 PM

Quote:

isnt it likely that the solid lifter will have a different pushrod cup height than the hyd lifter?
can you use a hydraulic lifter but make sure its full of oil?

if you use a very light pressure checking spring and make absolutely sure the hydraulic lifter does NOT collapse any, then yes you can

Set the lash at zero and watch the lifter cup to retaining ring clearances and go from there

Let us know what you find out

another messy option is to prime the motor while doing the PtoV checking

I've done that also