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G'day
Most will remember from about a month back, that no matter what was done, t=
he newly rebuilt early six-cylinder engine of the BN3 refused to start. New=
points, condenser, etc etc didn't help. We even towed the car up and down =
our very quiet road and all we managed to achieve was 65lbs oil pressure. T=
he cylinder compression for each cylinder was between 0 and 5lbs.
Needless to say, there was much scratching of heads, but to no avail.
So the car was winched on to a trailer and taken away to a friend's place f=
or some serious fettling. However beforehand I removed the radiator, water =
pump, hoses and so on. This is no mean feat in the BN3 as most of the radia=
tor (actually the same design as in our Healey Duncan) sits under the shrou=
d with only the rear of the header tank sitting out into the engine bay.
As many said, it had to be the timing, meaning that the timing cover was to=
be removed. We had visions of removing the carburettors, exhaust manifolds=
, engine mounts so that the engine could be tilted to gain access to the cr=
ankshaft pully nut. But no, as for once there was a real plus in having a D=
HMC car as apart from a single horizontal bar between the radiator and the =
engine, the cross braces and everything else was removed to fit the six-cyl=
inder. Even the horizontal bar has been cut away so that the shortened fan =
blades fit.
The crankshaft nut came away, as did the harmonic balancer and the timing c=
over.
The nice, pretty and new vernier timing chain was fitted incorrectly. Don't=
ask me how as it remains a mystery. Everything back together, except for t=
he radiator and its compatriots. Tickle the chokes, pull the throttle and p=
ress the solenoid button. Bruum! Away it went.
Since then the cooling bits have been reinstalled and flushed, tappets done=
and the engine runs very smoothly due to the $$$ spent on balancing. Next =
is a little panel work and my recommendation is to never try and squeeze a =
six-cylinder engine through a 100 bonnet opening.
Many thanks to everyone who responded.
Hoo Roo
Patrick Quinn
Blue Mountains, Australia
From: Patrick and Caroline Quinn
Sent: Monday, June 12, 2023 3:41 PM
To: healeys@autox.team.net
Subject: Rebuilt Engine Compression
Hello
No amount of churning over with a new battery will induce the BN3's rebuilt=
engine to fire. Even towing the car up and down the road failed to instill=
any life into the engine.
Everything is spot on - timing, spark and fuel.
Anyone have an idea as to what the compression be on a rebuilt engine shoul=
d be?
Many thanks
Patrick Quinn
Blue Mountains, Australia
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<p class=3D"MsoNormal">G’day<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Most will remember from about a month back, that no =
matter what was done, the newly rebuilt early six-cylinder engine of the BN=
3 refused to start. New points, condenser, etc etc didn’t help. We ev=
en towed the car up and down our very quiet
road and all we managed to achieve was 65lbs oil pressure. The cylinder co=
mpression for each cylinder was between 0 and 5lbs.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Needless to say, there was much scratching of heads,=
but to no avail.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">So the car was winched on to a trailer and taken awa=
y to a friend’s place for some serious fettling. However beforehand I=
removed the radiator, water pump, hoses and so on. This is no mean feat in=
the BN3 as most of the radiator (actually
the same design as in our Healey Duncan) sits under the shroud with only t=
he rear of the header tank sitting out into the engine bay.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">As many said, it had to be the timing, meaning that =
the timing cover was to be removed. We had visions of removing the carburet=
tors, exhaust manifolds, engine mounts so that the engine could be tilted t=
o gain access to the crankshaft pully
nut. But no, as for once there was a real plus in having a DHMC car as apa=
rt from a single horizontal bar between the radiator and the engine, the cr=
oss braces and everything else was removed to fit the six-cylinder. Even th=
e horizontal bar has been cut away
so that the shortened fan blades fit.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">The crankshaft nut came away, as did the harmonic ba=
lancer and the timing cover.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">The nice, pretty and new vernier timing chain was fi=
tted incorrectly. Don’t ask me how as it remains a mystery. Everythin=
g back together, except for the radiator and its compatriots. Tickle the ch=
okes, pull the throttle and press the solenoid
button. Bruum! Away it went.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Since then the cooling bits have been reinstalled an=
d flushed, tappets done and the engine runs very smoothly due to the $$$ sp=
ent on balancing. Next is a little panel work and my recommendation is to n=
ever try and squeeze a six-cylinder
engine through a 100 bonnet opening.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Many thanks to everyone who responded.<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Hoo Roo<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Patrick Quinn<o:p></o:p></p>
<p class=3D"MsoNormal">Blue Mountains, Australia<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
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<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-ligatures:none;=
mso-fareast-language:EN-AU">From:</span></b><span lang=3D"EN-US" style=3D"m=
so-ligatures:none;mso-fareast-language:EN-AU"> Patrick and Caroline Quinn
<br>
<b>Sent:</b> Monday, June 12, 2023 3:41 PM<br>
<b>To:</b> healeys@autox.team.net<br>
<b>Subject:</b> Rebuilt Engine Compression<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Hello<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">No amount of churning over with a new battery will i=
nduce the BN3’s rebuilt engine to fire. Even towing the car up and do=
wn the road failed to instill any life into the engine.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Everything is spot on – timing, spark and fuel=
.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Anyone have an idea as to what the compression be on=
a rebuilt engine should be?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Many thanks<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Patrick Quinn<o:p></o:p></p>
<p class=3D"MsoNormal">Blue Mountains, Australia<o:p></o:p></p>
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