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Old 11-13-2008, 07:41 PM   #11 (permalink)
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Hmmm. Why would my valve lash be increasing with every engine revolution? Also, should I expect my cylinders to hold/develop pressure when the engine's turned by wrench?

I started by setting the A group, then went to turn the engine to adjust the B group, and heard hissing. Figured that would be the spark-plugs I put in finger-tight to not have anything fall into the chambers, so removed the spark plugs. But then I figured I'd try the compression tester, and at wrench-turned speeds, they're not holding any pressure. Can I safely ignore this as being on account of slow speed? Or should I be concerned?

Back to the valve lash, I adjust the B group, turn the engine back to the A group position, check them, and they're too loose... Tighten the clearances, move engine, the B group's loose. Repeat, repeat, repeat... What gives?
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Old 11-14-2008, 01:44 PM   #12 (permalink)
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Default 8v lash

It Must Not. (increase, no matter, your check is very good, )
and setting lash to the center range (using round numbers) is best.
  • Set TDC #1 on crank index 0 degr.
  • make sure #1 is firing not #4 (watch valve actions)
  • number 1 cyl. valves cam not pushing lifters.
  • Dizzy rotor pointing to #1 is good sanity check.
  • set lash I1, I2, E1,E3 , one phase 1.
  • rotate crank 360 deg CW.
  • set lash on, I3,I4,E2 and E4.
i got rid of wierd fsm coding and use the unambiguous, eg. I1 for Intake 1 and E4 , exhaust 4.

that makes it easier , I hope.

#1 TDC can be found many ways.
Dizzy rotor , weak as it might be set wrong.
watching valves , always works.
take a tube (hose) and blow air in the cylinder 1 to find real #1 , not too good a check if lash is wrong. (too tight)
compression gauge attached #1 and observe pressure increase after Intake cycle just before TDC , compressing. (can fail if valves are too tight)

the best is watch valves or the cam lobs pressing on the lifters.
Just watch #1 and #4 like a hawk.


just make sure you are not starting on TDC #4 which is very easy to do.


if head or dizzy was off car,
ignore dizzy rotor, it will be wrong ,fix that later.
watch the valves, always works. every time.

I hope the helps.

cheers.

I mentioned setting valve loose on some engines.and that is because , I track valve lash.
if it keeps getting tighter (valve recession can happen) then I tend to set the lash to what my engine is doing.
this is old school and is not as important today with better valves. but I still measure them all and log them. (out of habit)
I worked on MG's and Triumphs and lots of things that loved to work in tighter valve lashes with time.
The good old days ,weren't.
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Last edited by jtgh : 11-14-2008 at 01:51 PM.
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