Originally Posted by alex8
DLOCKHART, don't know what you mean by "I drop a line in a can and bleed it from the can locally while I'm setting the injector timing". How do you get a draw from the can? (and i'm hoping i don't have to time injectors since it always ran great and started with no throttle) So, I guess it wouldn't be cool to bleed while running the starter motor?
WOT, that's OK, I joined a while ago before I had a boat just reading the posts. Now I'm actually one of you. I'd do anything to hear the little engine running again.
Nope, you won't have to time the injectors.
Let's go back to basics for a minute.
I am making the following assumptions based on what you have posted; please excuse me if any are incorrect.
This is your first boat.
This is your first time at being a diesel mechanic
This is the first time the engine hasn't worked for you.
You topped off the fuel tank and the engine started OK, ran for about 10 seconds and died and won't restart.
It had run OK every time prior to this event.
You changed primary and engine filters.
The primary was "a mess" (as in very dirty, clogged etc???)
You have tried to prime the fuel system but can't get any fuel to flow through to the engine filter.
Given that, let's diagnose the problem(s) for the data (assumptions) given.
First problem was that the engine wouldn't run or restart after topping up the fuel tank. It is highly unlikely that topping up the tank has caused this problem so something else has. Most likely cause would be lack of fuel caused by clogged fuel filter. This is, in part,
supported by the primary filter being "a mess". Apart from that, there may be other reasons why the engine won't run (like faulty lift pump) but until you resolve your second problem (below), you can't really explore them.
Second problem, after changing both filters, you can't prime the fuel system and as you are aware (or soon will be), the engine will not run until all
the air is purged from the fuel system.
The following is just a short heads up on priming the fuel system; it is not a complete set of instructions nor am I diesel mechanic
- just like most of us, I am self taught by necessity. You will find heaps of info on CF if you use the custom google
search function in the search pull down menu rather than the other search functions. Once you know the basics of bleeding the fuel system, you will find easier and/or quicker ways and shortcuts to do this for your particular setup.
Back to bleeding the system. You have to get all the air out of the system at least up to the injector pump and maybe right though to the injectors themselves. You will either have to pump the fuel through or use gravity.
As you only have the engine fuel lift pump to use, it is a little harder but certainly not impossible. I suggest priming this pump by removing the fuel line at the outlet side of of the primary filter and pouring diesel into the line with a small funnel. Now operate the pump by hand and see if you can pump fuel through it - should only take a handful of strokes to get some fuel moving through it. Keep topping up the fuel in the funnel.
If it doesn't pump, rotate the crankshaft as described earlier and try again. If it still doesn't pump fuel, then your pump has failed - which could be the cause of the first problem. Fix pump!
However, if it does pump, then continue with bleeding by loosening the bleed screw on the engine filter and pump away until only fuel comes out - no air. Tighten this screw and move onto the bleed screw at the injector pump and repeat the bleeding process.
Once there is no more air at this point, retighten the screw.
Don't forget to keep the fuel in the funnel topped up during all this.
Reconnect the outlet side of the primary filter and disconnect the inlet side. Now prime the primary filter by pouring fuel into the filter from the inlet side of the filter and loosening the bleed screw on top of the filter. Again continue until no air comes out, only fuel. Tighten bleed screw.
Now you can either reconnect the inlet side of the filter and try to start the engine or just try to start with the funnel (full of fuel) still connected to the inlet side of the filter.
If it doesn't start fairly quickly, you will have to bleed the injector side of the injector pump. Do one cylinder at a time.
Operate the decompression levers (both).
Loosen the banjo bolt at the injector and rotate engine briskly either by hand
or with starter motor. Continue until fuel is flowing freely and then tighten banjo bolt and stop turning engine over. Repeat for other cylinder.
Return the decompression levers to normal position and try to start engine.
It should start; if not repeat the bleeding process!
Assuming it does start, it may or may not keep running depending on how much air is in the fuel line between the inlet side of the primary filter and the outlet of the tank. Again this air has to be pumped out. This not always easy just using the engine lift pump but it can be done.
As mentioned earlier, having a gravity feed fuel tank is very helpful for bleeding the fuel lines but if your tank is below the engine lift pump, then many people fit a small electric
auxiliary fuel pump between the fuel tank outlet and the primary filter inlet. You only operate it when bleeding the fuel system and use it to move the fuel (and air) through the system instead of the engine lift pump. The pump will allow fuel to pass when it is turned off. It isn't necessary but does make the job a whole lot easier and quicker. Just the thing after having to change a primary filter due to dirty fuel in the middle of a rough sea-way!