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Josie's Dad 11-16-2000 05:03 PM

Hello everyone! Hope your all getting ready for Thanksgiving dinners and overdosing on football!

I have a 1989 (Federal) 300E. I went out and bought a Fluke 87 III and followed the instructions on a previous post regarding lamda readings. I put the red lead in pin #3 of the round diagnostic plug and gounded the other lead. I then set the meter to DC volts, hit the HZ button twice to show percentages, then hit the (((( button to change the polarity. Started the car and found the value to be right at 50% which I think is good. However, when the engine gets warm the value drops into the mid 30% range. I tried to adjust using the tower but no luck in making adjustments! My understanding is the lower the % the richer the fuel mixture vs the higher the % it is leaner. I don't know if my tower is defective so I bought a new one. But on the existing tower it looks likes it's held in by some sort of rivet. My replacement kit has two screw in bolts. I'm afraid if I break off the existing tower there might not be any threads to intall the new one. I know I'm getting long winded here but I would appreciate any help or suggestions on these issues. Thank you, Josie's Dad


stevebfl 11-16-2000 05:43 PM

Look at your new part. You will see an allen down from the top and a wrench like protrustion on the bottom. When you adjust you place your allen wrench into the top female allen socket and you push against the light spring untill the allen on the bottom of the tower engages its female receptical and then you turn it.

If you were doing all that I fear you have a problem with the lower screw rather than the tower. The tower comes with break-off screws which must be chiseled out of the old set-up. There are threads beneath what you say look like rivets. We usually break the tower off and pull the pieces from beneath the one time screws. They then come out with a pair of pliers.

[This message has been edited by stevebfl (edited 11-16-2000).]

Benzmac 11-16-2000 09:57 PM

As Steve said, You MUST push down and turn counter clockwise to get it leaner.

Donnie Drummonds

Aaron 11-17-2000 09:53 PM

Seconding Steve's advice, you have to chisel the old bolts out by gradually backing them out. When you put the new tower on, make sure to start the bolts at the same time and run them down evenly a little at a time. Then tighten them down and the allen heads will snap off leaving you with the same "rivet" looking fixtures. Good luck!

Aaron Greenberg
MB technician
Mercedes-Benz of Cincinnati
'67 250SE Cabriolet
'77 450SL
'80 300SD
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'93 300E 2.8
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benzboy 11-24-2000 10:57 PM

what Lambada? i am an apprentise and very intersedted in mercedes.

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