1 GM 10 H2O pump blues - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 11-19-2010
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1 GM 10 H2O pump blues

On haul-out of my brand new (to me) Flicka 20 I found the cutlass bearing was spinning with the shaft. The lands of the Cutlass Bearing were filled with mud and mud was plastered to the shaft. This shows the need for flushing water to the stern tube. Yanmar says that the raw water pump is too small to supply the stern tube and would not comment on adding a pump to the Engine or installing a larger pump. They said that there is no similarity between the one cylinder engine and the two cylinder engine raw water pumps. Somewhere I saw a reference to a fresh H2O cooling system so that would suggest that a second water pump could be added to the engine.

What do other 1 GM 10 owners do for cutlass bearing lubrication?
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Old 11-19-2010
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Describe your cutlass bearing and it's location.
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Old 11-20-2010
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Cutlass Bearing is located around the one inch drive shaft, In the stern tube which is a part of the long keel, It has a bronze shell around rubber lands. Water passes between the lands of the bearing and lubricates the shaft as it turns. The bearing is a close sliding fit on the shaft.
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Old 11-20-2010
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I have never seen a water pump hooked to the stern tube.There should be two slots in stern gland close to attachment to keel.marc
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Old 11-20-2010
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Quote:
Originally Posted by MARC2012 View Post
I have never seen a water pump hooked to the stern tube.There should be two slots in stern gland close to attachment to keel.marc
Ditto. The natural flow of water over the hub (assuming the channels are not also clogged) keeps the bearing lubed.

If there was mud packed into the lands of the bearing, then I'd start seriously trying to figure out how that came to be. I can't imagine any situation (other than a fairly bad one) which would lead to mud getting jammed into the bearing so thoroughly that it would freeze the bearing.

Are you sure that the bearing wasn't seized due to a shaft wrap?
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Old 11-20-2010
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Don't know what slots you guys refer to but all large ships have flushing water to the stern tube. If you have never seen this on a sailboat then you are not sailing big enough boats. In any case there is nothing I can pin the mud in the cutlass bearing to other than operating in a muddy environment and sitting at the pier for three years. I just bought the boat and have not yet started the engine. I must replace the cutlass bearing and clean off the blister barrier that blistered while sitting at the pier. Lots of work to do. So far after close examination of the stern tube there are no slots and no openings except the groves that will be in the cutlass bearing when I put it back in. So far the consensus is that no external flushing water is needed for keeping stuff out of the bearing/stuffing box. Once I go splash I will have a two day run to home port, that will tell the rest of the story as I will travel the Dismal Swamp Canal.
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Old 11-20-2010
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PS: I'm a master Chief Machinist Mate (Retired) I think I know a little bit about stern tubes. And,no the shaft is not bent.
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Old 11-20-2010
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Maybe large ships have a different arrangement. I have seen many stern tubes on power and sailboats and have owned several inboard sailboats up to 35 feet. None have had any pumps to lube the cutlass, whether in the hull as in a full keel boat or in a P bracket as in a fin keel boat. The slots are evident when looking at any cutlass bearing.

It probably silted up from not turning for years.
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Old 11-20-2010
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there should be set screws holding the cutlass bearing in place, did someone leave them out?

it sounds like his boat has full keel, not a strut holding the cutlass bearing. pretty much any sailboat under 100 feet wont have a pumped cutlass bearing. heck even most ships dont have a pumped cutlass bearing, they do have pumped shaft seals. 688 class subs dont have pumped shaft seals they use a bleed to allow sea water to do the job.

as for the mud, sounds like silt decided to settle in the bearing, i would bet it was acting like a filter from the shaft packing allowing water in to the boat.
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The Flicka 20
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