cant bleed the fuel lines - normally no problem

[black mercury]

Ok, I have re-read your post 16 and just realised that you said the engine still wasn't starting. If you are sure you have bleed all the bleeding points on the engine and it looks as if you have, try to start the engine and see if any smoke is coming from the exhaust, if there is then some diesel is getting injected. Or try to lightly hold your fingers on the injector with the decompressor lever on so the engine spins freely with either the starter or by hand, while the engine is turning you should feel a squeak through your fingers as the injector fires. If you don't then no fuel is being injected. When you opened the fuel return line at the injector and the fuel spurted out, did air and fuel spurt out, or just fuel? You could have a few possible faults. You say the injectors were serviced and this started after they were serviced, is this correct? It is possible that a speck of dirt is holding the needle off it's seat, possibly getting into injector when they were being fitted, and if so a tiny amount of air can be forced into the injector when the cylinder is on the compression stroke. Another possibility is that if the injectors have been serviced the injection pressure will have been adjusted. The pressure always falls as the injector ages, so it will probably now be set higher than it was before. It will be set correctly, however there could be wear to the injection pump and it now can't generate enough pressure at starting speed to open the refurbished injectors which are now set at a higher (but correct) pressure than before. This all assumes that the engine is bleed correctly.

 

[Airscrew]

The solution to this is to loosen the delivery valve on each pump just a turn or so after first loosening the attached injector pipe

Thanks BD.

Does this mean cracking the (each) injector feed pipe at BOTH ends?

 

[Airscrew]

Ok, I have re-read your post 16 and just realised that you said the engine still wasn't starting. If you are sure you have bleed all the bleeding points on the engine and it looks as if you have, try to start the engine and see if any smoke is coming from the exhaust, if there is then some diesel is getting injected. Or try to lightly hold your fingers on the injector with the decompressor lever on so the engine spins freely with either the starter or by hand, while the engine is turning you should feel a squeak through your fingers as the injector fires. If you don't then no fuel is being injected. When you opened the fuel return line at the injector and the fuel spurted out, did air and fuel spurt out, or just fuel? You could have a few possible faults. You say the injectors were serviced and this started after they were serviced, is this correct? It is possible that a speck of dirt is holding the needle off it's seat, possibly getting into injector when they were being fitted, and if so a tiny amount of air can be forced into the injector when the cylinder is on the compression stroke. Another possibility is that if the injectors have been serviced the injection pressure will have been adjusted. The pressure always falls as the injector ages, so it will probably now be set higher than it was before. It will be set correctly, however there could be wear to the injection pump and it now can't generate enough pressure at starting speed to open the refurbished injectors which are now set at a higher (but correct) pressure than before. This all assumes that the engine is bleed correctly.

Thanks BM.

Infact, yesterday I took out the injectors and will have them (re)checked this week.
To eliminate them from the problem.

Is it possible, and do you advise that I ask the shop to set them to a lower pressure?
Or would that only compound them problem.

 

[black mercury]

No, they should be set at the correct pressure, so just make sure they are breaking at that pressure, don't have them set lower. We will see how things go tomorrow.

 

[Old Harry]

Did the OP actually need these injectors servicing, was i a case if it aint broke ect ect

 

[Airscrew]

Did the OP actually need these injectors servicing, was i a case if it aint broke ect ect

I took them out for a check and service last autumn, in the process of trying to diagnose a different problem 'white exhaust' (also on this forum), which is possibly caused by overfueling.

Having the injectors checked is free (pressure and pattern)
Service, if needed, is £10 each.

 

[davidwf]

If you are afloat be careful re flooding the engine with Water you seem to have cranked it a lot, hopefully you are either out of the water or have shut the water intake off.

 

[Airscrew]

Thanks David.
Fuel was on. Water shut off.
Always worth double checking

 

[Bilgediver]

Thanks BD.

Does this mean cracking the (each) injector feed pipe at BOTH ends?

Once you get fuel coming out of the connection at the fuel pump following the retighten of the deliver valve housing then prime as usual at the injector. Have you tried this yet ?

 

[Airscrew]

Once you get fuel coming out of the connection at the fuel pump following the retighten of the deliver valve housing then prime as usual at the injector. Have you tried this yet ?

Not sure what you mean by the delivery valve housing.
Do you mean the top of the injector pump?

If so, I will also try to bleed here next weekend.

 

[Bilgediver]

Not sure what you mean by the delivery valve housing.
Do you mean the top of the injector pump?

If so, I will also try to bleed here next weekend.

Yes......the delivery valve housing is screwed into the top of the pump body. Just loosen them do not unscrew completely as you might lose difficult to replace parts.