HELP need help to get to work in 300d before afternoon - PeachParts Mercedes-Benz Forum

kbenjamin0106 · #1 08-10-2007, 08:38 AM

This morning im trying to start my 85 300d and the key doesnt turn to start. it will go through the first phase but not the second phase and fire up. this isnt the first time this happened either, im so sick of it and i need to know what is going on now, hopefully i was clear enough in my question.

Thankyou

Karn

Paul W · #2 08-10-2007, 08:46 AM

If it is a mechanical thing, I have had luck in the past with graphite. Get a tube and squirt it in the key slot then work the key in and out and turn it back and forth. Some times the tumblers get stuck.

TX76513 · #3 08-10-2007, 08:47 AM

Rock your wheel back and forth as you try and rotate your key. I am not a proponent of graphite in these ignition cylinders.

kbenjamin0106 · #4 08-10-2007, 08:52 AM

Thank you so far paul and tx, im gonna try your idea paul, wehn i move the wheel i think i have a little to much play in the wheel.

TX76513 · #5 08-10-2007, 09:04 AM

Sometimes they get a little bound up on the steering wheel lock mechanism

kbenjamin0106 · #6 08-10-2007, 09:09 AM

nope both those ideas didnt work, i used wd40 put put it on the key and in the tumbler and played around with it, didnt work

kbenjamin0106 · #7 08-10-2007, 09:10 AM

i can go past the steeringwheel lock stage im fine with that.

kerry · #8 08-10-2007, 09:13 AM

Can you get to the point where the glow plugs are energized? If so, then start it by jumping the wires at the junction box on the passenger inner fender well.
You need to replace the key switch.

kbenjamin0106 · #9 08-10-2007, 09:15 AM

yea i can get to that part where its fully energized but the i need to get the tumbler instuck.

kbenjamin0106 · #10 08-10-2007, 09:17 AM

can anyone give me a website and show me how much a new tumbler cost. and will it come with a new set of keys?

kbenjamin0106 · #11 08-10-2007, 09:22 AM

im gonna be on shopforum all morning, so have those ideas posted and ill get back 5 minutes or less with the conclusion of what happened.

TX76513 · #12 08-10-2007, 09:25 AM

IGNITION LINK

123 and 126 Removal Link

kerry · #13 08-10-2007, 09:29 AM

From what I've read on here, replacing the key switch can be a big headache once the tumbler becomes stuck. I wouldn't turn the thing anymore until I had a replacement on hand. Leave it in the on position, start the car by jumping the wires, stop it with the stop lever and disconnect the battery between uses.
I assume a key switch is available from Phil at the BuyParts link at the top of this page.

kbenjamin0106 · #14 08-10-2007, 10:27 AM

Can someone give me good details in to how to hotwire the car from the hood, im not in the mood today to get zapped today.

Mustang_man298 · #15 08-10-2007, 10:40 AM

Judging by the fact he has no problem turning the key up to the point of cranking the starter, I don't think the tumbler or steering lock is to blame here, or else it'd be happening at any position, it sounds to me more like the starting detents inside the electrical part of the switch have balled up and maybe gotten mashed. I'd pull apart the switch and see if the tumbler rotates properly with the switch part removed. (undo your battery first though)