MEP-002 injector pump issue

[Anthill]

I have a MEP-002 with 12 hours on it. I removed the tank and flushed it, changed the fuel filters and cleaned the strainer and added Diesel 911 for good measure. I got it running but it was not running well so i cracked the injector lines and it was getting fuel from the injector pump on the #1 cylinder, but not #2. So I took the injector pump off and tried cleaning it and putting it back on. This had no effect, still no fuel from the pump for #2 cylinder, but had fuel for #1. I then took off the injector pump and replaced it with on from a unit that was running well, but still no fuel coming out for cylinder#2. I checked the line and it was clear there was no fuel coming out of the pump where #2 line is.

Any suggestions ????

Thanks,

Ant

 

[jamawieb]

Are you cracking the line at the pump or injector?

 

[Anthill]

The first few times at the injector, but the next few times at the pump. It starts hard but runs runs on #1 and with #2's line off there is no fuel coming from the pump.

Thanks,

Ant

 

[jamawieb]

That's weird. I would take the delivery valve spring out of the pump, then turn the fuel pumps on and turn the motor over with a socket. As you turn the motor over you should have fuel shoot out of the #1 and #2 port as you rotate it. Be careful because fuel will shoot out about 3 feet. This way you will see it working.

 

[rustystud]

Try timing the injection pump.

 

[Anthill]

Every time I put the injector pump on I lined up the flywheel to "PC" on the compression stroke on #1 cylinder.

 

[jamawieb]

Try timing the injection pump.

I was thinking the same thing at first but he should still get some fuel out of #2 port when cranking or after it is started.

 

[Anthill]

The genset had a new Melton engine put in 10/2006, do you think it's possible that the cam is bad ? That's the only thing I can think of. I'd hate to tear the whole engine down and have it be something else. Any thoughts ?

Thanks,

Ant

 

[dependable]

Since you asked for thoughts..guesses.. I doubt it is the cam. Most likely something wrong with the IP, its plumbing, or some other fuel delivery issue.

 

[jamawieb]

The genset had a new Melton engine put in 10/2006, do you think it's possible that the cam is bad ? That's the only thing I can think of. I'd hate to tear the whole engine down and have it be something else. Any thoughts ?

Thanks,

Ant

I really doubt the cam is bad but you might want to look at the teeth and cam lobe on the cam shaft to make sure everything looks ok. I have a feeling it's going to be the button in the injector pump. If the button is way off, it could cause the pump not to function properly. I would try the flow test to check for the proper button size, it's in tm-34 on page 146 or 7-40. I do this anytime I have problems where I think the injector pump is the problem (which is 90% of the time). A lot of time I find the wrong button on the generators that were recently rebuilt or have low hours.

 

[rustystud]

What is bugging me is that he took a good running engines injection pump and installed it. The pump should be OK, no button problems or stuck valves or anything like that. It was from a good running engine. So that means there is something in this other engine that is messed up. Maybe the cam is bad. The lobe is worn down and not pushing on the pump. That is why at first I thought about timing. If it was say 90 degrees out the one would pump but the other would not. Not until it went 90 degrees more. But then it would put out for #1 and #2. So I'm back to a bad cam.

 

[Anthill]

I found the issue - the cam shaft sheared between the injector lobe and the injector timing gear. I can't believe it sheared with 6 hours on it, or that it was able to run like that.

Is this an interference engine ? If not I might try and slide a new cam in. Is it possible to put a new cam in without a complete tear down ? It has the access on #2 cyl side - would just have to pull fan and timing cover ?

Any suggestions ?

Thanks,

Ant

I will post a pic as soon as I can - have a meeting now

 

[rustystud]

I believe you can install the cam after removing the timing cover. You will also have to loosen up the rockers to remove the push-rods and then hold up the lifters.

 

[Anthill]

Here is the pic

 

[Anthill]

Does anyone know if this is an interference engine ?

Thanks,

Ant

 

[rustystud]

View attachment 565787Here is the pic

I can safely say that is a broken cam ! It's amazing it even moved the injection pump !