Fuel shut off? - PeachParts Mercedes-Benz Forum

crazy4diesel · #1 06-13-2014, 01:03 PM

Is there a way to pull vacuum or something on the fuel shut off valve to allow the engine go be cranked but not start? My engine has been bone dry with oil, for a few months, and would like to crank it a few times to help get oil moving before it turns over.

resto108 · #2 06-13-2014, 01:08 PM

Just hold the stop lever to stop. Or if you want to do it by yourself, pull a vacuum on the stop solenoid.

Diesel911 · #3 06-13-2014, 02:03 PM

Another way to keep the Engine from starting is to loosen the Fuel Injection Line Nuts at the Injectors.

The shut off lever can be tied or wired down.

uberwasser · #4 06-13-2014, 03:23 PM

All of the above. If you want to do it from inside the car just run a few feet of vacuum line from the vacuum fitting on the shut off valve to a mityvac inside the car. Pump it up to 20Hg and crank. When you're ready to start the car just release the vacuum at the pump.

crazy4diesel · #5 06-13-2014, 05:08 PM

Thanks everyone, I wondered, the stop lever hadn't even occurred to me, I forget that thing is there.

crazy4diesel · #6 06-13-2014, 05:09 PM

Any tricks to filling the coolant for the first time too? System is bone dry at the moment as well. I'll be using Evan's waterless coolant.

uberwasser · #7 06-13-2014, 06:40 PM

All I ever do is fill it up until it reaches the fill mark on the expansion tank, then turn the car on with the expansion tank cap OFF and run it in the driveway at varying RPM's until it reaches about 60*C.

Top it off if the level has gone down. Put the cap on, and let it warm up to operating temp.

Then just check it each time before you drive it the next few times and top off if needed.

toomany MBZ · #8 06-17-2014, 08:49 AM

I think 20inHg is too much, closer to 8 inHg. Do a test, with the engine running, connect the mity vac to the shut off actuator, pump until it shuts off, note the inHg.

Your car has a self bleeding t'stat housing.

crazy4diesel · #9 06-17-2014, 10:38 AM

Quote:

Originally Posted by toomany MBZ

I think 20inHg is too much, closer to 8 inHg. Do a test, with the engine running, connect the mity vac to the shut off actuator, pump until it shuts off, note the inHg.

Your car has a self bleeding t'stat housing.

Thanks for the T-Stat info. I can't do a "test" on mine as for the purpose I'm doing this I don't want it to run. Maybe this test could be done on an already running car?

toomany MBZ · #10 06-17-2014, 11:20 AM

Well, I mean to find out how much inHg you need to shut the engine off, only pull that amount of vacuum, you don't want to rupture the diaphragm inside the shut off actuator, they're pricey. That way you'll have two hands free.

Also, on the coolant fill, have the nose of the car as high as you can get it, turn the heat on too, this will send coolant everywhere it can go. Then proceed as uberwasser's suggestion.

crazy4diesel · #11 06-17-2014, 12:36 PM

Quote:

Originally Posted by toomany MBZ

Well, I mean to find out how much inHg you need to shut the engine off, only pull that amount of vacuum, you don't want to rupture the diaphragm inside the shut off actuator, they're pricey. That way you'll have two hands free.

Also, on the coolant fill, have the nose of the car as high as you can get it, turn the heat on too, this will send coolant everywhere it can go. Then proceed as uberwasser's suggestion.

Thanks, I understand the concept, it's just that I'm wanting to do this before I allow the engine to run...so, no way to really experiment with it on my own.

spock505 · #12 06-17-2014, 02:42 PM

I always remove the glow plugs or injectors then give a liberal squirt of motor oil into the bore. Helps lube of first start up but also helps the rings get a good seal until they loosen up.

If you want to turn the engine over without firing, engage starter without waiting for glow plug light to go out.

toomany MBZ · #13 06-17-2014, 02:55 PM

Quote:

Originally Posted by crazy4diesel

Thanks, I understand the concept, it's just that I'm wanting to do this before I allow the engine to run...so, no way to really experiment with it on my own.

I see, if you can hold/wire down the stop lever, that will work fine.