I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)

Head. Gasket or valve.

"nate" wrote in message
. ..
I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)

Bill,

You the man! ...So you don't think I'll have to tear it completely down /
take the engine out?

Nate


"Bill McKee" wrote in message
link.net...
Head. Gasket or valve.

"nate" wrote in message
. ..
I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)

Bill,

You the man! ...So you don't think I'll have to tear it completely down /
take the engine out?

Nate


"Bill McKee" wrote in message
link.net...
Head. Gasket or valve.

"nate" wrote in message
. ..
I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)

Squirt about 1oz of 30 to 50 wt oil in that cylinder, enough to wet the
entire circumference and check compression again. If there's no change it
should be a valve or gasket. If the compression jumps up it may be a
piston/ring which means you need to go into the block. The only other
possibility is that a hole in the piston is large enough that the oil won't
seal. In that case you might be able to see it with an inspection mirror
and a small flashlight through the spark plug hole.
LD

"nate" wrote in message
. ..
I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)

Bill McKee wrote:
Head. Gasket or valve.

"nate" wrote in message
. ..
I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)


Why? It could very well be a hole burnt in a piston, or a valve broke
off and pounded a hole in the piston. Usually if it's the head gasket,
you'll show a little compression, but will leak down easily. Same with
a burnt exhaust valve.

In article ,
says...

I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)

Probably a valve problem, like the intake seat came out, and the valve
is resting on it. Presto, no compression, and backfires through the carb
like crazy. If there is a hole in the piston the engine usually blows oil
everywhere from every orfice, and you lose oil like crazy.

Generally, a blown head gasket affects 2 cylinders.

or the exhaust valve is burned out. When I pulled the head on my 4-cyl
140 the #4 cylinder had a big V-notch burned in the valve, and a burnt
gasket between 2 and 3. Head was warped out about 10 thousanth's. New
valves, seats, and gaskets and planed. I havent put it together yet,
but I'm looking forward to having it run by the weekend.

Tim

Engine back fires and sputters./.."

OOPS, sorry, I missed the backfiring part. I'd say it's an intake valve
problem, But I doubt if you need to pull the whole block. jsut the
head...BUT, I'd pull them both and have the job done right. You might
be doing some preventive maintianence by haveing the other head
inspected as well.

Tim

Pull the head in the boat and check it out first. Then you may have a real
problem if the head or valve is not bad.
Bill

"nate" wrote in message
. ..
Bill,

You the man! ...So you don't think I'll have to tear it completely down
/ take the engine out?

Nate


"Bill McKee" wrote in message
link.net...
Head. Gasket or valve.

"nate" wrote in message
. ..
I have a 8 cylinder 350 (I think GM..it's in a boat)

Engine back fires and sputters. Engine does not leak oil that I know
of.
(or at least not very much)Compression test revealed 0 compression in 1
cylinder and all others were ok. Based off these symptoms, Is it likely
that I will have to do work on the engine block or will the problem be
likely in the Head (gaskets or other)