Outboard Engines

Carrera

After one year, I think I learned a fair bit about boats and think I'd been getting a lot of bad advice.
The thing to do in this situation (with an old boat) is to fit an outboard engine. This involves bolting a bracket to the stern of the boat with coachbolts. I'm using some plywood as a buffer and painted the ply with external marine varnish.
Seeing as the Mariner engine will go to the extreme left, I can leave my inboard diesel as it is. The plan will be to get it going but I already excluded marine mechanics as I fouind they don't understand VW engines.
The marine mechanics had me fitting an electric fuel-delivery pump when it simply wasn't necessary since Bosch fuel-injection-pumps themselves can drive fuel through the hoses.
However, I'm satrting with the outboard. Unlike my inboard, the outboard is easy to get at and not boxed in.

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EoinC

Carrera - I thought you were hibernating. Are you sure about not requiring a delvery pump? Are you sure that the vehicles that your model of VW engine is usually fitted to don't use fuel pumps to get the diesel up to the injection pumps? Having an injection pump lift against a head is not only pretty hard on the pump, it also means that, at the very slightest sign of a leak, the injection pump will suck air into the system.
I have a gravity feed on my Yanmar, which works nicely (and uses less than 1 litre per hour).

stevebaby

Very classy boat, Eoin.
Love the Gaff rig and from the freeboard she looks to be a dry and comfortable cruiser. What sort of timber is she built from...local?

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EoinC

G'day, SB. She's 3/4" carvel-planked jarrah, built by some Italian Bro's back in the early 70's. She was originally used for squidding. The Yanmar 12hp runs a treat, and pushes her easily at 6 knots in classic putt-putt mode.
I took her out for a quick test sail when I was down in Oz in December. I pick her up when I get back down in mid-Feb. She comes complete with a mooring on the raging Swan.
I'm looking forward to when SWMBO puts me in the dogbox, coz the new dogbox is a mighty fine place to be. Watch out, Rotto.

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Carrera

I'm positive. I cracked the fuel delivery system today. It wasn't rocket science. I unscrewed the fuel-injector unions and worked the primer bulb I fitted into the hoses. That drew diesel up through the filter and some way into the inlet hose. I then energised my Bosch injection pump and connected up the starter-motor lead. Then, for the first time, I could see diesel squirting out of the union pipes every few seconds.
So, I have fuel delivery. No doubt. Bosch rotary injection pumps have internal pumps so there is no need for a crankshaft driven diaphragm pump to be fitted.
Now I have to test the heater plugs as there isn't enough heat in the cylinders.
I've been wasting my time with local marine mechanics as they don't know this or how the wiring is set up to the Bosch pump.
You'll find most marine diesel engines are different than mine. Most have an actual crankshaft-driven fuel pump that actually delivers the fuel to the pump and keeps it pushing through the system - like a heart. Many marine injection pumps even fit onto the engine via splines, although mine is driven by the cambelt.
I should point out my boat is a real challenge. It's very old and came to me as a virtual heap of scrap. Restoring it is a huge project, involving big cycle rides to get there and back. I have a hell of a lot of work to do on it.
I'm adding an outboard as an extra engine.
I had a nightmare once it sank on its maiden voyage. Woke up with a jolt.

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"Everybody has a philosophy. However, what philosophy you have is a matter of choice, and most people don't make a conscious choice with regard to what philosophy they accept."

EoinC

Carrera - All injection pumps have pumps (that's what they are), and all will handle a small amount of suction head. It is preferable not to have your injection pump having to fight against suction head - not only does it make hard work for them, but it also allows air to be introduced to the system if there is not 100% sealing all the way from the fuel tank's fuel level upwards (air will get through cracks that diesel won't.
Are you 100% sure that the vehicles which use your model of engine don't have a fuel pump located inside, or outside, of the tank? It is unusual to expect an injection pump to cope with the head and friction losses associated with dragging the fuel from a remote tank.
My diesel doesn't use a lift pump - it has the fuel tank located higher than the injection pump.
What size of Mariner did you get? The smaller ones don't have a reverse - they rotate 360º. Be aware that, whilst a small engine will be able to get your canal boat moving, it may not be very effective in manuevering it (ie. Use your existing rudder for turning) and, more particularly, in stopping it once you're underway.
Getting totally off topic - I have fond memories of towing a 1 ton mooring assembly with a zodiac fitted with a little 4hp outboard, coping with the 11m tidal movements of Northern Australia (had to wait for a king tide to float the assembly, which was temporarily tied off to empty 44's for buoyancy). At first it turned to shite, as all that happened was the zodiac pointed whichever way you made it, whilst the outboard and towed assembly carried on moving whichever way they felt like moving. Through my beer-steeped brain cells, I finally figured that I should tie the tow off to the bow and reverse the outboard to go stern first. It then went like a dream, using the outboard to keep us trimmed as we found the 5kn tidal current to get us to Spot X.
We had one single poly line wrapped around the drums and the assembly, so that cutting the line would release the 44's and allow the assembly to sink, and the permanent float to...float. When we got to Spot X, touching that line with a knife was like Hiroshima revisited - It went off like a frog in a sock. A veritable mushroom cloud of bloody 44's flying through the air. Excellent mayhem with a superb result. That mooring was still in place when I left a couple of years later, and it survived numerous cyclone strikes and gunshot wounds without giving up.
It was one of those "Give me a big enough lever, and I'll move the World" type scenario's. I used to get a kick out of just looking out from the cliffs at that mooring sitting out there (well, perhaps the kick was more associated with the beer I was drinking).

Carrera

Boats almost never have Bosh injection pumps. Most boats also have easier injection pumps which you can take off without having to worry about the timing belt.
My pump is driven via the injection pump sprocket which connects to the timing belt so to change the pump you need to reset the engine timing.
Someone on the boat forum had me buying an electric fuel-delivery-pump which I got from a scrapyard some time ago. I now know fitting it may have been catastrophic. It would be trying to deliver diesel to the injection pump inlet hose, possibly at a greater rate than the injectors could deal with.
I think my Mariner is 2.5. Do you know Anything about this engine? I figured 2 stroke is less hassle with no valve timing or timing belt to worry about. Pollution is not so good, though. These engines just pump the oil and petrol through the system and cough it out again.
I intend to buy the Mariner engine workshop manual.

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"Everybody has a philosophy. However, what philosophy you have is a matter of choice, and most people don't make a conscious choice with regard to what philosophy they accept."