In reply to a message from golfnut324 sent Sun 8 Jul 2012:
ok, that looks good, BTW after the cyl head rebuild I seem
to have a constant 176-175-173-174-174-175. (a 1966 4.2L)
But a friend who’s car I was helping to sort out developed a
sudden oil leak into the air intake and from the inlet cam
cover, not much oil, but high pressure and very messy.
Very high oil pressure, especially when revving a bit, it
would jump off the scale and inject oil into the air intake
through the breather.
We suspected the oil filter housing and valves, and next the
breather but nope, in the end we measured compression and it
turned out to be: 187-186-0-173-183-180!
So otherwise nice, but cyl. nr #3 !?!??! The needle would
not move at all, absolute zero compression. A stuck valve?
That’s what we thought, but with a primitive compressed air
leak-down test showed all the air was going straight into
the crankcase, as if the piston had a hole in it.
The piston looks fine from what we can see though the plug
hole, but surely piston rings can not evaporate without any
rattles and other noises, can they? And even if they were
shot, with a warm engine and lots of oil you’d expect the
needle to move at least a bit, right? No?
Anyone (Ken?) with experience in taking the pistons out
through the bottom? Can you get any of them out without
removing the crank? When I replaced the big end bearings and
con rod bolts and nuts I thought I could have taken the
pistons out too, if required. I did not as there was no
need, but now I am not sure what to tell this friend of mine
about his options, or some alternative to a complete
professional rebuild, huh?
Pekka T. 1E76372BW MOD–
The original message included these comments:
Disregard this question. I found that a carpenter’s shim on
its side fit perfectly and I think I’m justified in being
pleased that, after 45 years and NO other engine work except
the top half was worked in 1994, the compression came out
Craig Gilbert - '68 E-Type FHC
Birmingham, AL, United States
MKV 3.5L DHC, E-type 2+2 Ser.1 MOD, XJ6C MOD, XJ8 Executive
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