In article ,
"Steve" wrote:

Shouldn't have happened on this engine since the OP states that he just
rebuilt the engine, which would mean new cylinders (most likely). The only
other possibility would be a defect in the gasket or gasket surface of the
heads. There's just no other way for water to get into the oil.

In my 15 years experience with Volvo MD series engines, the most likely
culprit will be the water pump seal.

Steve
s/v Good Intentions



If it was just rebuilt and new liners were installed, without
a pressure test being done on the cooling system, then I would
seriously look at a bad Liner Seal. I don't know this engine,
but a bunch of small diesels that use replaceable liners have
O-Rings, that seal the bottom of the liners, and they can be
bad, out of the box, or get pinched wrong upon assembly.
Most good rebuilders will pressure test the cooling system
for leaks before first fire, just to avoid this problem.
Also may be a warped head and a head gasket that didn't
seal correctly. Pressure test the cooling system, but putting
a plate across the input and output cooling ports and then
run the the pressure up to 20 PSI and then valve it off and
watch a pressure guage installed on one of the plates. It you
got a cooling system leak, it will be obvious in 10 minutes.

Bruce in alaska
--
add a 2 before @

These engines don't use liners. Each cylinder sits on top of the crankcase
opening with a shims between the cylinder base. There is a machine cylinder
skirt that fits into the machined opening in the crankcase for a registered
fit. The shims are inserted or removed to adjust piston top
clearance/compression ratio. Other wise this is a metal to metal fit up.

The water jacket in only in the cylinder casting and there is at least a
half inch of metal in the bottom of this water jacket.

The cylinder are held in place by the four long head studs that thread into
the crankcase. The passage for these four bolt does not pass through the
water jacket.

The oil passage from the crankcase gallery goes up to the head/rockers via
an independant passage in the cylinder casting. Oil runs back via the push
rod opening in the head and cylinder casting.

So there is only one mechanical joint in this whole assembly that could let
cooling water get into the crankcase and that is the head gasket.. It's been
5 years since I had a Volvo MD cylinder head off and I'm not sure there is
an O ring in this location.. However it this O ring were missing, IMHO there
would be evidence of oil leaking from the head/cylinder joint.

--
My opinion and experience. FWIW

Steve
s/v Good Intentions

These engines don't use liners. Each cylinder sits on top of the crankcase
opening with a shims between the cylinder base. There is a machine cylinder
skirt that fits into the machined opening in the crankcase for a registered
fit. The shims are inserted or removed to adjust piston top
clearance/compression ratio. Other wise this is a metal to metal fit up.

The water jacket in only in the cylinder casting and there is at least a
half inch of metal in the bottom of this water jacket.

The cylinder are held in place by the four long head studs that thread into
the crankcase. The passage for these four bolt does not pass through the
water jacket.

The oil passage from the crankcase gallery goes up to the head/rockers via
an independant passage in the cylinder casting. Oil runs back via the push
rod opening in the head and cylinder casting.

So there is only one mechanical joint in this whole assembly that could let
cooling water get into the crankcase and that is the head gasket.. It's been
5 years since I had a Volvo MD cylinder head off and I'm not sure there is
an O ring in this location.. However it this O ring were missing, IMHO there
would be evidence of oil leaking from the head/cylinder joint.

--
My opinion and experience. FWIW

Steve
s/v Good Intentions

I have a friend who has this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.



MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.

I have a friend who has this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.



MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.

I have a friend who has this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.



MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.

I have a friend who has this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.



MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.

I have a friend who has this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.

MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.

I have a friend who has this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.

MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.

I have a friend who had this problem, and it turns out it may not be all that
serious. He changed oil and ran it a bit, then changed oil again and ran it,
and did that a couple of times. When he had finished, the mechanic told him
that he had just steam cleaned his engine. It ran very well thereafter.

But there may be more to it that I have forgotten. I am going to sent this to
the guy and see if he won't tell any part of the story that I forgot.

What I do know, however, is that with a little work he certainly didn't have to
have the engine rebuilt.

MLapla4120 wrote:

Hey,
Some seawater is in my newly re-built MDIIB diesel (volvo), what do I do?
I changed the oil five times and the filter twice. Runs great otherwise.