Not if you are just testing them.

EDIT: You can replace the shields later if you find the injectors are not the problem or you end up replacing the injectors.

Also won't hurt to double check and make sure the "ball" in the prechamber is still intact when you swap the injectors. I would imagine there might be other symptoms first, but it takes seconds to check soo...

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

Can the ball be seen by looking in the injector's hole?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Well this is my OM606 turbo idling on a very cold morning

smokey!

Yes, Remove the heat shield and just shine a flash light down the hole you'll see this "tad pole" looking thing.

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1983 123.133 California
- GreaseCar Veg System

That looks more like water vapor, not smoke.

Yep. Here's a pic of a new one as reference...

Attached Thumbnails

 

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

The hole in the 617 PC won't be that big. You can remove the glowplug to shine light into it.

EDIT: Pic of one I have from my engine.

Attached Thumbnails

 

That is a 617 PC... I looked at my old one and it has the smaller hole like yours. Guess the newer ones have a larger hole?

I like the glowplug + light tip!

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

The results are in. I swapped #2 and #1 injectors, the misfire stayed with #2. I warmed up the car and did a compression test.

#1) 375

#2) Wait for it...........0 (Checked 4 times. There was a little hiss when I pulled the gauge but what ever pressure there was not enough to register.)

#3) 345

#4) 360

#5) 350


So...stuck valve, hole in piston

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

That sucks hard... can a blown headgasket cause this? Sure hope it is a "cheap" fix... you've sure been through a lot with this whole ordeal!!

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

I'm guessing it's a valve. There is almost no blow by which a cracked ring or piston hole or headgasket leak would create right?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

I am sorry to hear that happened. Judging from the picture you posted, I would assume your engine is eating coolant from a blown gasket. Have you noticed your coolant level going down? I would try a leak down test on that cylinder and then off with her head to know for sure...... That sucks.

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1983 123.133 California
- GreaseCar Veg System

Just checked the coolant. The radiator is full and the upper radiator hose is not firm (it was when the engine was warm).

Tomorrow I'll pull the valve cover and have a gander.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Next step, check your valve clearances.