That makes sense, but there IS less pressure under the oil cap since I reseated that tube and got the filter remounted (and there was more when the housing broke loose)

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT

Another impossibility.

The engine crankcase produces the blowby gases and they are either vented to the atmosphere or sent to the engine for burning in the combustion chamber. The pressure from the crankcase is unchanged in either case.

In the former case, all the blowby gas is vented to atmosphere. In the latter case, all the blowby gas is sent to the combustion chamber. If you open the oil filler cap, some of the the blowby gas escapes to the atmosphere leaving you with the erroneous conclusion that there is less pressure in the valve cover.

Hello all,

I've pulled the injectors to find they look filthy, and the front two were "wet." Smelled like diesely oil to me. These are the two injectors that were not getting glow plug action.

Still not sure how to test glow plugs. Neither are the fellows at the shops I go to ask them to use their ohm meter on them. Which two points on the glowplug should I place the leads on? What setting should the ohm meter be on? Thanks for any advice on this matter. I wonder if the glow plugs are actually fine, and the toaster elements are just needing cleaned and tightened up at all their junctions. The car again is a 1978 300d, with the filament style glow plugs.

Once all the injector lines were off, and all the glow plugs out of the holes, you can see the carbon inside the pre-chamber from the glow plug hole. Wow, it's crusty in there. Will do the compressed air trick before reassembly.

Here is the photo of the day, the oily crusty injector nozzle. Sorry about the resolution. I'm going to bet that the injectors and the glow plugs are original, as they did not want to come off the motor. I'm also thinking the injectors are toast. Will have them tested tomorrow.

I must say that I am partial to the pre-turbo 123's. There is so much room under the hood, a monkey could repair it.

Attached Thumbnails

 

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1978 Mercedes Benz 300D. Butter color, named "Larry." (Bought out of a barn in Caldwell, ID with a vintage "Larry Craig" sticker on it.) 229,000 miles, dark brown interior, need map pockets!

1995 Suburban diesel, frybrid kit. 20k on veg, runs great.

Future mods, Frybrid WVO.

In most cases. a new engine is allmost allways cheaper to buy than to rebuild your old engine. (Unless you are doing the repairs yourself!)

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

And they are hammered. Had to have been originals, 230K. Can't wait to try clean glow plugs, reamed and blown out prechamber and new injectors.

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1978 Mercedes Benz 300D. Butter color, named "Larry." (Bought out of a barn in Caldwell, ID with a vintage "Larry Craig" sticker on it.) 229,000 miles, dark brown interior, need map pockets!

1995 Suburban diesel, frybrid kit. 20k on veg, runs great.

Future mods, Frybrid WVO.