Originally Posted by Bregts
Maybe someone has seen this before?
After arriving in New Zealand
I had to leave the boat on it's own for almost two years. Before lay up I changed the oil and flushed the engine cooling system with fresh water and salt away. So for two years the engine wasn't touched. Engine has 2300 hours on it and maintenance
was done every three months when cruising.
About a month ago I tried to start the engine but without luck.
I have been troubleshooting for a month now and still can't get the engine started but today ..... I took the exhaust manifold/mixing elbow off and it was 100% blocked with some white gunk on the engine and the exhaust side. See attached pictures.
The white stuff was relatively easy to remove so that left me with just carbon built up and a 10mm diameter hole. Just for testing purposes (I know I have to replace the mixing elbow) I mounted it again and tried to start the engine but still with no luck.
I have tried all possible ways of venting the petrol system for a month now and I do get a steady stream at the injectors so I don't think it's that. replaced diesel filter twice and I do feed the engine now from a funnel high up on the wall just to make sure. New diesel also.
I have two new batteries
. 1100CCA together so that should be fine for a 600cc diesel.
Air intake is fine.
I do get white smoke coming out of the air intake after crank tho.
I took the valve cover off today and white stuff what limited to the exhaust side and didnt built op in the engine and everything looks ok there.
Does anyone has any clue what the white stuff might be?
Anyone an opinion on how the engine cranks in the attached video? I'm out of options besides taking the engine head off now which I rather not do.
Any input is greatly appreciated.
I have 2 MD2020s; they're both probably about 10 years older than yours.
The heat exchanger/manifold on mine is cast iron. In your picture, the mounting surface for the mixing elbow appears to be aluminum
. If this is the case, the white material could be oxides of aluminum
or some such combination of electrolytic product, especially if the gasket
between them has a graphite component in it.
If the corrosion' is easily cleaned off, and the sealing surfaces are still good, and there is no evident damage further into the manifold, I would not suspect that the damage has extended to the valves.
That little engine is trying hard to start; the video played both audio and visual fine for me.
As SM says, the first problem is getting the engine up to proper cranking speed. The most common problem for an engine that has sat for a while is a bad ground, though there can be a bad connection on the positive side that causes the same symptom. The rapid slowdown exhibited when cranking shows either a connection, cable or battery
charge problem, all which must be fixed first.
Not so common is corrosion
between the starter and the block, or between the starter solenoid (the one on the starter itself) and the starter, which is best addressed by removing the offending part, cleaning
the mounting surfaces and remounting with some sort of anticorrosion agent. A quick fix can often be had though by loosening and tightening the mounting bolts..
Once you get the engine spinning fast, you may find it starts with little further action; it's going to be rough for a bit but will likely smooth out as everything reseats itself.
If it still won't start, try a tiny squirt of starting fluid, with no glow plugs,
whilst spinning the engine over. It should attempt to start, and may start and run, smoothing out as it goes.
If not, more drastic measures are called for, beginning with the simplest and proceeding to the most complex.
That the engine ran fine when laid up would lead me to simple things, provided no water was ingested into the top end.
If the engine starts and continues to run rough, or has problems like weird or no throttle response, the fuel pump
likely has sticking internal parts
and needs to be cleaned. The pump
on this engine is fairly simple; if you are experienced and patient, it is possible to do this yourself. If you're not, you should be able to find someone who is...