Rusticular Exhaust Port

[ducked]

Eeeuw!

1GM10 exhaust port, as well as being very sooty, seems to have "rusticles"

Going by a photo which I'll try and post in a minute or two. I cant see into it directly.

Access is especially poor because the companionway structure is fixed, so I can only get to the engine from above. I suppose I'll have to unfix it and start coal mining, appropriate for Boness.

The exhast elbow, OTOH, seems in fairly good condition and its annular water jacket doesnt seem to leak into the exhaust. but I suppose water vapour from the exhaust could still condense in the cylinder head, causing rust.

I'm thinking I probably have to take the cylinder head off so I can see what I'm doing. Any special issues with that on these engines (apart from having to buy a head gasket?)

 

[ducked]

Seems pretty straightforward, though he's doing it on the bench, which will be MUCH easier. He says the manual has the head gasket the wrong way around.

Last engine I did was a rubber band OHC so this (apart from access) should be much less of a PITA

Hopefully I can get away with just removing the cylinder head, and wont have to take the engine out.

I have wondered about making myself a glove box for fiddly disassemblies (like maybe the injector in this case?) and since I dont now have my own workspace, this might be the time.

 

[rotrax]

Turn the engine to compression which will ensure the exhaust valve is closed and dig it out in situ. Chisel the big bits out carefully and then spin a small wire brush on a drill in there. Dust sheet pretty essential.

Those 'stalactites' may be a build up of evaporated salt. Pretty sure they will clean out easily.

It was a lot softer, but I have regularly cleaned old tech petroil two stroke exhaust ports that you could not get a 1/4 drill bit through the hole left in the carbon build up!

 

[PatrickB]

I did mine recently, exactly as Rotrax suggests. Dig out the big bits (carefully, you don't want to go through the wall of the exhaust port) with a small screwdriver, then a Dremel with a wire brush. Mind you, it would be a lot easier to do it on the bench, so if removing the head doesn't scare you then crack on.

 

[ducked]

I did mine recently, exactly as Rotrax suggests. Dig out the big bits (carefully, you don't want to go through the wall of the exhaust port) with a small screwdriver, then a Dremel with a wire brush. Mind you, it would be a lot easier to do it on the bench, so if removing the head doesn't scare you then crack on.

Thanks. Clearance is the likely issue. Dunno yet if I can get to the oil banjo at the back of the head which is tight up under the bridge deck.

I believe this boat was fitted out by a professional marine engineer, so the indifferance to ease of maintenance is somehow unsurprising.

 

[rotrax]

Thanks. Clearance is the likely issue. Dunno yet if I can get to the oil banjo at the back of the head which is tight up under the bridge deck.

I believe this boat was fitted out by a professional marine engineer, so the indifferance to ease of maintenance is somehow unsurprising.

Due to First Mate suffering a very serious medical incident a year ago, our sailng days-but not boating days-are over.

With a very smug expression as I type this, our new boat, a 57 foot Steve Hudson canal narrowboat, has a dedicated engine room with a low revving Beta JD3 tug engine - 400RPM idle, max 1400RPM. Completely walk around, excellent access to everything.

Soon to be 79, I will enjoy not having to squeeze my tired and stiff body into small spaces!

 

[fredrussell]

Due to First Mate suffering a very serious medical incident a year ago, our sailng days-but not boating days-are over.

With a very smug expression as I type this, our new boat, a 57 foot Steve Hudson canal narrowboat, has a dedicated engine room with a low revving Beta JD3 tug engine - 400RPM idle, max 1400RPM. Completely walk around, excellent access to everything.

Soon to be 79, I will enjoy not having to squeeze my tired and stiff body into small spaces!

An engine room is, to me, the stuff of dreams. I’ve never really got over seeing my boat neighbour’s wide beam barge engine room. It included a very stout bench with a large vice. Swoon.

 

[rotrax]

An engine room is, to me, the stuff of dreams. I’ve never really got over seeing my boat neighbour’s wide beam barge engine room. It included a very stout bench with a large vice. Swoon.

Not quite got that, but a vice and a place to clamp it is ready.

 

[ducked]

I had a job in a shipyard doing an MOD/PnO cut stretch and shut on a Dublin ferry, and remember seeing a guy decokeing a cylinder while standing inside it