Lotus Elan

white smoke and CO

PostPost by: twincamracing » Wed Sep 14, 2005 1:20 am

First off, Your rings or valve stems are going south.
hence the smoke and oil burning.

easy way to check is a cylinder leak down on a warm engine

But what you are
experiencing is mild carbon monoxide poisoning.

this is something you muist attend to straight away lest you pass out
and stuff it raising the values of the rest of our cars...not the way i
want to see it happen

most common place for this to enter the cabin is
through the is the rear boot lid, rear light gaskets
or a breach in the rear body seals.

since i just mentioned i drive a alfa super this is a pretty common
alfa problem made worse by an aftermarket exhaust tip, the direction it
points and the length it extends makes a difference

check the shift boot seal and any of the body seals
for your accelerator cable, brake, etc. Any place a
object needs to go through the firewall to the
outside.

i believe it has been mentioned already; also check for oil leaks on
the exhaust what is coming out around the engine may be oil dripped on
to an exhaust pipe and burning off as it gets hot, you'll still get the
fumes as it continues to burn.

back to the leak down; if you haven't a proper guage but have a source
of compressed air bring a cylinder to TDC (else the engine rotates
under pressure) pressurize the cylinder through the spark plug hole.
pull off the oil filler and listen, lots of hissing from air means the
rings are gone and the combustion is blowing into the crankcase...may
be part of the oil leak problem...open the throttle and listen for air
escaping past a poor valve seal, like wise listen at the exhaust
outlet. do each cylinder in turn to get a good seat of the pants feel
for the internal condition of valves and rings.

cheers,
scott



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PostPost by: "collins_dan2000&quo » Fri Sep 23, 2005 1:40 pm

I've done more investigating, smelling and sealing.

I taped over a couple of gaps in the firewall and a larger crack in
the fiberglass created by the PO hanging the exhaust from it. I've
noticed that I have a number of different smells, mostly exhaust and
burnt oil. I don't have any oil on the garage floor, but do believe
that oil is likely dripping onto the exhaust from the rear crank
seal, causing part of the smell.

I also noticed that plugs 1 & 2 have seeped oil onto the top of the
engine. What is causing that? These are also the plugs that have a
habit of fouling. On the engine, the PO wrote: The guides are new,
valves are original. When the block was apart, we checked the rod
bearings, ok, but did not pull the pistons. Is this a rings issue or
values, or both? Thanks. Dan '70 S4 SE



--- In ***@***.***, scott potter <[email protected]>
wrote:
> First off, Your rings or valve stems are going south.
> hence the smoke and oil burning.

easy way to check is a cylinder leak down on a warm engine

> But what you are
> experiencing is mild carbon monoxide poisoning.

this is something you muist attend to straight away lest you pass
out

and stuff it raising the values of the rest of our cars...not the
way i

want to see it happen

> most common place for this to enter the cabin is
> through the is the rear boot lid, rear light gaskets
> or a breach in the rear body seals.

since i just mentioned i drive a alfa super this is a pretty common
alfa problem made worse by an aftermarket exhaust tip, the
direction it

points and the length it extends makes a difference

> check the shift boot seal and any of the body seals
> for your accelerator cable, brake, etc. Any place a
> object needs to go through the firewall to the
> outside.

i believe it has been mentioned already; also check for oil leaks
on

the exhaust what is coming out around the engine may be oil
dripped on

to an exhaust pipe and burning off as it gets hot, you'll still
get the

fumes as it continues to burn.

back to the leak down; if you haven't a proper guage but have a
source

of compressed air bring a cylinder to TDC (else the engine rotates
under pressure) pressurize the cylinder through the spark plug
hole.

pull off the oil filler and listen, lots of hissing from air means
the

rings are gone and the combustion is blowing into the
crankcase...may

be part of the oil leak problem...open the throttle and listen for
air

escaping past a poor valve seal, like wise listen at the exhaust
outlet. do each cylinder in turn to get a good seat of the pants
feel

for the internal condition of valves and rings.

cheers,
scott



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PostPost by: twincamracing » Sun Sep 25, 2005 12:50 am

Howdy dan,

I also noticed that plugs 1 & 2 have seeped oil onto the top of the
engine. What is causing that?

likely seepage from the cam cover finding a low spot

These are also the plugs that have a
habit of fouling. On the engine, the PO wrote: The guides are new,
valves are original. When the block was apart, we checked the rod
bearings, ok, but did not pull the pistons. Is this a rings issue or
values, or both? Thanks.

it is not unusual after having a fresh top end for the increased
cylinder pressure to cause blow by the rings...after the top end seals
well the pressure wants to leak out, or down ;)

plug fouling on one and two sounds pretty indicative of the above

down and dirty run a compression test on each cylinder and follow up
the first compression reading with a shot of oil from a squirt can if
the compression reading jumps way up its rings

alternatively, go back to a previous post about how to do a leak down
test. dual guage leak down testers are less than $100. and can give you
a definitive answer to how much leakage is in each cylinder and where
it is leaking

cheers,
Scott

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