Volvo Penta 2003 injector pump problem???

[boathead]

Morning folks, can anyone advise: I have a fella here with an engine problem, the engine is a 1979 Vovo Penta 2003. It is delivering fuel to only the last injector. We've taken the pipework off from the 'pumps' and turned the engine over. Fuel comes out of No.3 pump but not the other two. Cam and pistons o.k., if we slacken pump 1 & 2 by a half turn and turn engine over it shoots fuel out 20 yds. but tighten back to correct setting and nothing. Number 3 (which we assume to be the only one working correctly) doesn't blast the fuel out i.e. we can put a finger over the open end and fuel just pushes out, is that right or should they all blast fuel like a high pressure hose? This is being done with the pipework off the pumps so we can see where fuel is going, and obviously as the fuel inlet side is at No 1 and No. 3 is the one with the return, fuel is getting there via 1 & 2 because No 3 delivers fuel, but is not coming out of 1 & 2 unless we slacken the individual pumps and then as said the fuel 'jets' out 20 yds.....................

We decided to take one of the pumps out but it began to feel tight as we slackened it so stopped. We thought maybe if we took one out we may see what the problem was. We were a bit worried about the shims too if we did take one out?

Anyone got any ideas what this problem might be, or how we can go about diagnosing it?

Cheers.

 

[mattnj]

my advice.....post this question on boatdiesel.com under the correct section of course, there is a guy, Dick Vosbury, who is an expert on these and will give you all the info you need (hopefully)

 

[Bilgediver]

Morning folks, can anyone advise: I have a fella here with an engine problem, the engine is a 1979 Vovo Penta 2003. It is delivering fuel to only the last injector. We've taken the pipework off from the 'pumps' and turned the engine over. Fuel comes out of No.3 pump but not the other two. Cam and pistons o.k., if we slacken pump 1 & 2 by a half turn and turn engine over it shoots fuel out 20 yds. but tighten back to correct setting and nothing. Number 3 (which we assume to be the only one working correctly) doesn't blast the fuel out i.e. we can put a finger over the open end and fuel just pushes out, is that right or should they all blast fuel like a high pressure hose? This is being done with the pipework off the pumps so we can see where fuel is going, and obviously as the fuel inlet side is at No 1 and No. 3 is the one with the return, fuel is getting there via 1 & 2 because No 3 delivers fuel, but is not coming out of 1 & 2 unless we slacken the individual pumps and then as said the fuel 'jets' out 20 yds.....................

We decided to take one of the pumps out but it began to feel tight as we slackened it so stopped. We thought maybe if we took one out we may see what the problem was. We were a bit worried about the shims too if we did take one out?

Anyone got any ideas what this problem might be, or how we can go about diagnosing it?

Cheers.

I think it would help get an accurate answer if you were a bit more specific about the details. You talk about unscrewing the pump however it does not screw out of the crankcase. It is held in place with a flange and two nuts.

I could guess at what you are saying but without wasting your time I would ask you to tell exactly what you are unscrewing to see the 20 ft jet and where is the 20 ft jet coming from....ie the injector feed pipe....The top of the delivery valve.....or leaking past the delivery valve threads when you slack them.

If you download the manual.

http://www.manualnguide.com/dl/17486/


You will be able to describe exactly what is happening. Your problem could be sticking racks...Stuck delivery valves or just airlocking. What you should see is fuel coming out of the injector pipe connection in relatively low pressure spurts. This only converts to high pressure when the injector is in place.

SOmetimes these pumps airlock and will not lft the delivery valve in which case you may have to slacken of the delivery valve housing to get it started but I have only seen this on rare occasions . I suspect that what you are unscrewing is not the fuel pump but the delivery valve on the top of the pump.

If the fuel spill is returned to the fuel pump then it usually has to pass through a restrictor union stud. IE the stud isn t a normal fully drilled one but has just a wee hole in it of a fraction of a millimetre. this is important to maintain back pressure in the spill line from the injectors. Better still take the spill line to the tank.

The most important thing to do is keep track of the shims for each pump as these determine the calibration and timing. This is all described in the manual.

 

[itsmepaul]

Hi I know a long time ago now but did you fine out what the problem was