The quickest way to tell your problem is by doing a leak down test.
There are specialized tools for this purpose but, you can do it without.
Using a pressurized air hose with an adaptor to fit in the sparkplug hole,
pressurize the cylinder you want to test with about 150 lbs of air.
Because you have no compression in this cylinder, the air will leak out: If
it leaks out the carburetor or the exhaust pipe, you have a leaky valve
(intake or exhaust depending upon where the air comes out): If the air
leaks out through the rings, you will hear the "hiss" through the oil
dipstick tube.
A least then, you will know where to look.
Good Luck.
Paul
-----Original Message-----
From: healeys-bounces+bj8mk3=shaw.ca@autox.team.net
[mailto:healeys-bounces+bj8mk3=shaw.ca@autox.team.net] On Behalf Of James
Shope
Sent: Thursday, September 27, 2007 8:15 PM
To: healeys
Subject: [Healeys] playing detective
my friends bj8 started running rough a while back. we were going to do a
tuneup but a compression check showed only 60 psi in #6. machine shop found
a
crack and pinned it, plus all new valves, hardened seats, and new guides.
new
rings and bearing were also put in. after reassembly, all cylinders but #1
had 125-130 psi. 1 had no compression. after checking everything we could,
off came the head again. nothing is wrong!! the valves look perfect and
held
solvent for over an hour with nothing coming out of the ports. the cylinder
held solvent until we wiped it out. the gasket looks perfect. we took
valves
out and checked them and they appear absolutely perfect. what else can it
be.
#1 was fine before going to shop and appears perfect now. anyone ever had
anything like this happen? now is your chance to be a columbo or dirty
harry.
do your duty and send a clue. healeymanjim
1
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