Anyone had an inlet valve clearance sudenly drop to ZERO

KSCRIM · Post by **KSCRIM** » Sun Jul 03, 2011 5:43 pm

I have one inlet valve on #1 down to 0 clearance, ALL others are normal, exhaust also normal. I have a bad cold misfire which reduces to minor when warm. Nothing else is faulty, been through everything. Just #1 compression down to 150.
This suddenly started a few weeks ago, engine was fine before then.
It is a JDM 98NB 1600 with solid lifters, the shims are all similar thicknesses.
Have I dodged dropping a valve? and the stem has stretched??
I've posted in the Miata forum also.

KSCRIM · Post by **KSCRIM** » Mon Jul 04, 2011 2:42 pm

The head is at the doctors to have a new valve fitted and re-shimmed. He will replace all 16 guide seals and fit new cam seals also.
Pix on the Miata.net forum http://forum.miata.net/vb/showthread.php?t=426120

KSCRIM · Post by **KSCRIM** » Fri Jul 08, 2011 8:55 pm

The head is back, 1 new valve, 16 new stem seals, 2 new cam seals, clean and set up (the shim was still the right thickness). Pix of the valve face in the Miata thread.

KSCRIM · Post by **KSCRIM** » Sat Jul 09, 2011 5:28 pm

We are up and running again, no problems starting once the fuel pressure was up. Smooth and quiet, wonderful!!.

Anyone had an inlet valve clearance sudenly drop to ZERO

Anyone had an inlet valve clearance sudenly drop to ZERO

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