Subject: Re: Valve Adjust Question
Author: Alan Dunphy
Date: Jul 27, 2002, 9:22 AM
Post ID: 1710681900
If you are truly on TDC on the compression stroke and you have a
variation of clearances then the base circle is out of round on that lobe of
the cam. This is not uncommon on loop engines. However instead of finding
the spot where the play is the greatest and adjusting there you should find
where the play is the least and adjust at that spot. Yes, your engine will
make more valve noise but you will not be risking a burnt valve.
The idea is to have the valve fully closed through out the
compression and power stroke. If you adjust at the loosest spot on a cold
engine then the valve may open slightly when the tighter section of the base
circle shows up on a warm engine. If this happens on the compression stroke
you will be bleeding off compression, if it happens on the power stroke you
WILL burn a valve.
Alan
'74 Eldorado LAPD Wixomized
MGNOC 4352
Alan R. Dunphy
adun-@midmaine.com
Pittsfield, ME 04967-1426
----- Original Message -----
From: "Ian Adkins" <ianad-@linkamerica.net>
To: <Loopfram-@topica.com>
Sent: Saturday, July 27, 2002 11:40 AM
Subject: RE: Valve Adjust Question
| Keith, What I do is use my T-handled allen wrench to guage when the piston is |
| Just slide it in the spark plug hole (being sure you don't get it at an angle and jam it in there DUH!) and turn the timing nut with a big wrench back and forth till you get to TDC. At TDC of the compression stroke both valves will be closed that there should be .006 play on the intake and .010 on the exhaust. I always start on the left side and them move to the right side when I am done. I pull the spark plugs out of both cylinders so the engine turns easily. Good luck....after a few times it becomes second nature....Ian
|