BENZ AID - COMMON QUESTIONS AND ANSWERS

Cold or warm compression checks..or both?

Got the factory manual CD...200dpi scans...it sucks a little there.

My question is...Mercedes recommends 80 degrees C for compression checks...all of mine were done at stone cold (why we got rid of one car)...So, which one? As is predictable, the stone cold readings are dramatically different from the 80 degree readings.

While I have not yet done a comparison on the cars we still have, on the one we got rid of, the warm one was at 400 as opposed to 190 cold (on the cylinder that was low...the others were over 350). What does this indicate (a leakdown got on #1 got the compression to 400+...would seem to indicate rings.)?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Buy rebuilt injectors OR rebuild myself, 1983 300D

I'm struggling with the decision over buying the injector rebuild kit (with monarchs) or simply buying the already rebuilt monarchs and returning my cores. I know some of you have gone down this road and I would appreciate any comments and/or advice you could give.
My worry with doing it myself has to do with leaks. It seems like competent folks who are following the procedures are still getting leaks. Has anyone experienced leak problems with the MB Source rebuild injectors?
Thanks and I'm going to make a decision sometime in the coming 2 weeks.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1975 240D Relocate Fuel Filter

Hi,

I need to know the size of a fuel hose.

It's the clear fuel hose that returns fuel from the injector pump to the top of the fuel filter. The barb connection on top of the fuel filter and the banjo/barb fitting on the back side of the I.P.looks to be slightly smaller the the other banjo/barb fittings on the fuel filter. I have 5/16 hose on all my other banjo fittings and would think it would be the same size, but it looks smaller.

Chassis Model Number

W115

Forums

SVO Fuel Conversion Specific Aid

1982 300D Engine Knocking After Injector Cleaning

Hi Everyone,

I just finished fixing one problem only to get myself into another :-). I tried to install some of the new monark nozzles from mercedessource. I tried to be very careful and clean when reassembling the injectors after replacing the nozzles and thoroughly lapped all the mating surfaces with fine sand paper as described in the guide.

One thing I was not able to figure out is how to remove the old crush washers from the engine to replace them with new ones. Because of this I left them there. Any tips on how to remove these would be much appreciated as they seem pretty stuck in there and there were no hints in the manual I received.

Chassis Model Number

W123

Forums

SVO Fuel Conversion Specific Aid

1983 300SD won't keep running

OK.I had an injector return line leaking,replaced it...drove around the neighborhood for few minutes and then went back to the house thinking everything is OK but then when I put it in reverse it cut off.Did the same thing twice more...though there was some more air in the system...bled the injectors and primed the hand pump...btw I just instaled the new upgrade pump...since U don't have to screw it does it have to be all the way down?I pumped until it got tight but it's not all the way down...now the car won't even go forward...it crankes up fine (running a little rough) but when I put it

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

123 Mercedes 300D Turbo Oil Return Gasket Replacement

Help! So I am in the middle of changing the gasket for the oil return pipe that goes from the turbo to the top of the oil pan and I thought once I started I would figure out a way to get the whole pipe out, but I am about 1/8th of an inch of clearance from being able to get the top half of the pipe off. Is there a secret to this? I searched the internet and the only tip I could find is to remove a heat shield that would give a little more clearance but there must be some further tip as I contemplated that but it didn't look like it would help.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1982 240D too much inside tire wear ??

Hi,

I have replaced everything steering and suspension wise except the steering box(which does have some play) and had the car fully checked over and aligned. I am getting very server tire wear on the two front tires on the inside. The tires don't even have 5000 miles on them and have already been rotated once. I brought this back to the shop and they said oh these old mercedes just have the camber set which tilts the tire and there is nothing I can really do about it.

Chassis Model Number

W123

Forums

Transmission / Suspension Specific Aid

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