Mercruiser 120 water in oil
 

Twice I have replaced head gasket thinking water was leaking into oil ,
last time did pressure test and checked plane on head , head was fine
which leaves me with a crack in the water jacket , has anyone tried
putting sealer in , and with a external water source how do you put it
in .
Any help would be greatly appreciated
Paul

Mercruiser 120 water in oil
 

Sealers seldom work on a closed cooling system. The chances of it
working on a raw system in a boat are zip. They need to get hot and
circulate around in the cooling system for a while if they are going to
even have a chance at working.

Did the head gasket look ok when you disassembled? You should also
check the top of the block with a straight edge. Any events leading up
to the problem like overheating? Did you winterize last time? Was it
leaking at the beginning of the season or did it start in the middle?

Engine blocks very seldom crack from normal use.

wrote:
Twice I have replaced head gasket thinking water was leaking into oil ,
last time did pressure test and checked plane on head , head was fine
which leaves me with a crack in the water jacket , has anyone tried
putting sealer in , and with a external water source how do you put it
in .
Any help would be greatly appreciated
Paul

Mercruiser 120 water in oil
 

wrote in message
oups.com...
Twice I have replaced head gasket thinking water was leaking into oil ,
last time did pressure test and checked plane on head , head was fine
which leaves me with a crack in the water jacket , has anyone tried
putting sealer in , and with a external water source how do you put it
in .
Any help would be greatly appreciated
Paul

How would you describe the condition of each spark plug?
Jim

Mercruiser 120 water in oil
 

"jamesgangnc" wrote in message
ups.com...
Sealers seldom work on a closed cooling system. The chances of it
working on a raw system in a boat are zip. They need to get hot and
circulate around in the cooling system for a while if they are going to
even have a chance at working.

Did the head gasket look ok when you disassembled? You should also
check the top of the block with a straight edge. Any events leading up
to the problem like overheating? Did you winterize last time? Was it
leaking at the beginning of the season or did it start in the middle?

Engine blocks very seldom crack from normal use.

wrote:
Twice I have replaced head gasket thinking water was leaking into oil ,
last time did pressure test and checked plane on head , head was fine
which leaves me with a crack in the water jacket , has anyone tried
putting sealer in , and with a external water source how do you put it
in .
Any help would be greatly appreciated
Paul


I think it is new block time. Those old 120 Chevy engines did crack more
than any other engine if a overheat occured.

Mercruiser 120 water in oil
 

"Calif Bill" wrote in message
. net...

"jamesgangnc" wrote in message
ups.com...
Sealers seldom work on a closed cooling system. The chances of it
working on a raw system in a boat are zip. They need to get hot and
circulate around in the cooling system for a while if they are going to
even have a chance at working.

Did the head gasket look ok when you disassembled? You should also
check the top of the block with a straight edge. Any events leading up
to the problem like overheating? Did you winterize last time? Was it
leaking at the beginning of the season or did it start in the middle?

Engine blocks very seldom crack from normal use.

wrote:
Twice I have replaced head gasket thinking water was leaking into oil ,
last time did pressure test and checked plane on head , head was fine
which leaves me with a crack in the water jacket , has anyone tried
putting sealer in , and with a external water source how do you put it
in .
Any help would be greatly appreciated
Paul


I think it is new block time. Those old 120 Chevy engines did crack more
than any other engine if a overheat occured.

CalifBill
Based on the information presented so far, and if it was your boat, would
you take your own advice and order a new block or engine package?
Jim

Mercruiser 120 water in oil
 

"Jim" wrote in message
.net...

"Calif Bill" wrote in message
. net...

"jamesgangnc" wrote in message
ups.com...
Sealers seldom work on a closed cooling system. The chances of it
working on a raw system in a boat are zip. They need to get hot and
circulate around in the cooling system for a while if they are going to
even have a chance at working.

Did the head gasket look ok when you disassembled? You should also
check the top of the block with a straight edge. Any events leading up
to the problem like overheating? Did you winterize last time? Was it
leaking at the beginning of the season or did it start in the middle?

Engine blocks very seldom crack from normal use.

wrote:
Twice I have replaced head gasket thinking water was leaking into oil ,
last time did pressure test and checked plane on head , head was fine
which leaves me with a crack in the water jacket , has anyone tried
putting sealer in , and with a external water source how do you put it
in .
Any help would be greatly appreciated
Paul


I think it is new block time. Those old 120 Chevy engines did crack
more than any other engine if a overheat occured.

CalifBill
Based on the information presented so far, and if it was your boat, would
you take your own advice and order a new block or engine package?
Jim


I would pull the engine and take it apart and see where the crack is. If it
is a head gasket, etc, then just rebuild the motor. If the block, I would
come up with another good block and build it up, using the cam from the
boat, changing the freeze plugs to brass, and reinstalling it. If not
mechanically inclined, if the block is broke, I would buy a new or rebuilt
long block.