I am trying to replace the injector nozzles today, but absolutely cannot get the injectors open. I have only one bench vise available but it's too small and slides around on the bench when force is put to the injectors. I can wait until tomorrow when someone I know is at his shop with a stronger vise, or I thought I would ask here in case someone happens to have their own little strategy for opening them. By the way I tried whacking the wrench with a rubber mallot as suggested on dieselgiant, but to no avail.

Many thanks in advance,
Geoff

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1981 300SD, odometer stopped at 188,000

big vice. 18" breaker bar. cheater pipe?- I have not needed one yet.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

two large wrenches with long handles... SQUEEEEEZE them together...
good luck.
I'd wait for the large bench vise...

The Combination wrench is 22mm but a big Cresent wrench can also work. If you can get someone else to hold the Combination wrench down for you. I have also torqued them like this but for the torquing it is best to have a vice.

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84 300D, 82 Volvo 244Gl Diesel

Daang, great ideas guys. Thanks for the help!

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1981 300SD, odometer stopped at 188,000

you can always use a few c clamps to lock the vise to the bench

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1981 300SD 512k OM603

I agree with the two long wrenches. Harbor freight, like the one pictured above, has some cheap ones. If you do it this way you wont side load the injector body like I have done in the past with a socket. You also won't risk hitting the pintle or anything with the socket over the end.

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

The long handled combination wrench is part of a set from Harbor Freight; when on sale tha several weeks ago the the set was $16.99. As you said you could use 2 combination wrenches but my socket is deep enough that there is no problem with hurting the pintel.

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84 300D, 82 Volvo 244Gl Diesel