Here's the deal, my 300SD has apparently spun a bearing in #3 - slight knockin at speed and oil pressure slightly dippin from the peg, increased oil consumption too. Yet car starts and runs reasonably well. Thinkin I'll decompress #3 by pulling the glow plug so it doesnt die outright and car will be drivable to go and snag fresh engine. Or is there a better way to shut down 1 cyl outa 5??

Crack injector line going to it so there's no fuel?

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER

There would be no fuel to the cylinder. It would go on the ground. Not what is desired, I imagine.

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Bob
'82 300D Petrol B-G Metallic

Yep, thats how i dx'ed the prob at #3 but dont wanna be pissing diesel fuel all over the engine. Or is there some kinda nut/bolt adaptor that can outright cap the injector tube?? That would be perfect.

Turn the line around and have it spray into a catch bottle or tee it into the return stream.

You can plumb the IP output for that cylinder directly into the return lines with a length of tubing and a "T". You'll either have to cut the hard line going to the injector or get creative adapting the fittings.

Dang, FI beat me to it!

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Thanks folks, sounds like a plan and easy to do. Reckon I'll crimp the tube midsection as well so it doesnt rob too much fuel pressure from #4 and 5 by free flowing into the return line.

It must be free flowing. It is a hydraulic pump, it must have pressure relief.

I don't think you want to do that. These are plunger type pumps. I imagine you could hydrolock them with no exit path for fuel. This would be bad.

We need a bosch pump guy to chime in...

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Bob
'82 300D Petrol B-G Metallic

With how high the pressure would be, I wouldn't want an output from the FIP going right into a return line.

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

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There wouldn't be any pressure because there wouldn't be a load.

I would just plum it back into the return line going to the tank, unless you crack it and its not that much

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1981 300SD 512k OM603

X2.

And........the volume would be relatively low. No impact on the system whatsoever.

There is extreme pressure there but its a tiny flow. Reminds me of ohms law for electricity

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1981 300SD 512k OM603

There is no pressure other than the head of the return line.........negligible. The flow is not very great due to the low volume in the element.