Volvo Penta 5.7 GXI Fuel in Oil Runs smooth at idle

[mckaras]

Hi all, thanks for the advice and help in advance.

I have an engine I had stored in the warehouse that's going to be used for a project. I ended up getting it to start and it runs good at idle. Compression all checked out around 180 PSI for all cylinders.

I ran the engine after doing changing out the fuel pump assembly, raw water impeller kit and the leaking seal and I went to go get the engine ready to suck out all the old oil. I took off the filter and the oil was watery and smelled like gasoline. Turns out I had an extra 4 quarts in it after running it for just 10 minutes on the pallet.

I already have a new fuel pressure regulator in route. The new fuel pump is a Chinese one that's I swapped with the old one due to the low pressure fuel pump not working properly.

I do have the injector rail pulled off with the injectors as of today and wanted to ask if there's anything else I need to check. Any pointers on how to test and see which one of the injectors is stuck open would be great. I have a battery and pigtail for the injector to test it. I just want to know how I can tell which one is stuck open as one entire bank I tested after cycling the key and applied 12V to and they all looks like they worked properly.

 

[cyclops222]

10 minutes on a pallet ?Any water ?

 

[mckaras]

10 minutes on a pallet ?Any water ?

Yes of course it's always connected to raw water. It's just strange that much gas was dumped into the oil in such a short period of time.

 

[Lpgc]

You have the injectors and rail off the engine - If the injectors are clipped to the rail you could reconnect the fuel pump to the rail and see which injector(s) squirts fuel when there is fuel pressure but no power to any of the injectors... When the injectors are not being electronically pulsed they should not flow any fuel.

Also check the fuel pressure regulator, if it references to vacuum and has failed in a certain way fuel could leak through the vac line to the manifold.

If there's enough fuel getting into a cylinder to get past rings and contaminate oil would've expected it to misfire on the respective cylinder due to massively over-rich mixture.

 

[ESGWheel]

For me the numbers are not adding up. I’ll explain. I have learned from this forum that the compression numbers max out around 150, so something going on there.

But it’s the extra 4 qts of volume in the pan that does not make sense as simply blow by from a leaking injector or even two or more from only 10 mins of running. Perhaps the regulator as Lpgc suggests but even that leaking by I would not expect to dump a gallon of fuel into the manifold in 10 mins.

Without meaning to give offence, a couple of questions if you do not mind to help me better understand:

• When you say “oil was watery” do you mean it was extra ‘thin’ as if the viscosity was significantly lowered due to a lot of gas mixed in or do you mean it was milky in color as if contaminated by water?
• Is it possible the engine had 4 qts of oil in it already and not knowing, you added another 4 qts and there is some injector leaking and thus ring blow by that tinted the smell of the oil and thus assumed the extra was all gas?

And do you still have the containers of the extracted oil? If yes and in clear jugs let them sit and see what separates out. If not clear, give it a vigorous shake to mix it and dump some into a mason jar, and again let it sit and see what separates out. Thanks.

 

[kd4pbs]

I concur. First, there's no way an injector could let loose a whole gallon of fuel in 10 minutes even if it were mechanically stuck full on. Second, your eyes would be burning from being so rich. Third, there's no way that even if somehow an injector did let loose of that much fuel, it would leak past the rings to the crankcase, even with worn out rings. It would much prefer to dump out the exhaust.
It just doesn't make sense here... if that were gasoline gushing into a cylinder it would NOT have run good at idle.
If the engine started with 5 quarts and ended with 9, I hate to tell you, but you added a gallon of water in those 10 minutes from a cracked water jacket or leaking head or intake gasket.

 

[Lou C]

Agreed it doesn’t make sense; id be thinking of doing an air pressure test of the cooling passages to see if they hold pressure….