Kaleb:
Bent rods in a 603 almost always result in extremely rapid cylinder
ovalization, accompanied by huge amounts of oil smoke, clanking
pistons, and other assorted noises. This is because the rods almost
invariably twist and set the piston off axis in the bore. That wears
the bore oval in a matter of minutes, hence the sudden extreme oil
consumption. We are talking quarts an hour, with the smoke you'd
expect. A totally blown out turbo will do the smoke thing, but no
running issues or sounds as it is dumping copious oil into the intake
AND hot exhaust.
Coolant loss with moderate oil consumption, especially if there is
oil in the coolant, indicates either a cracked head or a blown head
gasket. Since you have normal compression in all but #1 and #6, I
would suspect a bad head gasket, as they fail first on those two
cylinders and between #3 and 4 or 5&6 for some reason.
Could easily be a cracked head, though, as cracks between the valves
do not lead to oil passages and the coolant gets sucked into the
combustion chambers. Considerable white smoke and rough running cold
are clues to that.
Oil consumption can come from leaks at front seal, head gasket at
chain case, chain tensioner, bad oil filler cap, and turbocharger,
both from leaking lines and from bad internal seats.
I'd pull the head myself, as a bad head gasket will eventually leak
oil into #1. There is an oil passage machined in the face of the
head across the front, and new head gaskets are metal re-enforced
there, but they can still leak. Eventually there will be enough oil
in there to bend #1 rod. The gasket will also leak combustion gasses
out into the bolt holes, making it hard to get the bolts out. BTDT.
We saved my brother's SDL because an exhaust repair caused us to
discover a broken exhaust stud, hence head removal. Car ran fine,
but it was leaking oil into #1 from a dead gasket.
Peter
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