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#1
11-02-2005, 10:32 PM
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M103 Spark Plug Wire Cover Won't Stay Put
Ever since I took it off to replace the spark plug wires several years ago the plastic cover that goes over the wires and holds them against the valve cover just won't stay put. As much bandwidth the M103 gets here I've never seen any mention of it. Is it just mine or is it just me?
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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots) 5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others) 5 speed '01 Jetta V6 (new wifes car, pretty quick) 5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k ) 5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest) 0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it) 
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#2
11-02-2005, 11:04 PM
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For what it's worth, the plastic spark plug wire cover on the valve cover of my m102 won't stay put either..
I purchased a new one a couple years ago, because it was missing when I bought the car. The wires are Bosch. I'm wondering if they are too thick.. Everything seems to be routed properly, but the top part of the cover won't stay seated into the bottom half, as if the fastener plugs were already stripped or something.. Just an eye sore really.
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2000 c280 Sport (looks like an upgrade, feels like a downgrade) 1991 190e 2.3 (sold)
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#3
11-03-2005, 07:22 AM
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As you suggest the female threads do get stripped so the fasteners will not tighten. I suspect the original ignition wires were Beru so the Bosch replacement wires may indeed be a larger diameter preventing the cover from fitting properly.
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Fred Hoelzle
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#4
11-03-2005, 09:17 AM
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we have the same problem with the 300e. I think the wires were replaced on it. I gave up.
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#5
11-03-2005, 09:27 AM
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I assume that you are talking about the long flat plastic cover. You can make it fit by neatly getting the wires in place and then neatly wrap in a few places with electrical tape. This keeps the wires from putting pressure on the valve cover which forces the cover up and out of position.
It's been a LONG time since I did this so my explanation may be flawed. Good luck,
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#6
11-03-2005, 11:15 AM
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It's nearly impossible to get the spark plug wire holder on an M103 to work correctly unless it's brand new...even then they can be problamatic.
I would get a new upper and lower piece and use the electrical tape idea as mentioned above..it's really the best soloution. Jonathan
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#8
11-03-2005, 01:14 PM
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I bought a new one and it still keeps poping out, at least the back half is still holding, I will try a real small screw
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#9
11-03-2005, 01:35 PM
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So it's not me. I was always suspicious of trim under the hood. My wife's Jetta's engine on the other hand has significant amounts of trim that do nothing but look good. If they come off, they stay off, my wife doesn't care about what her engine looks like, at least not yet.
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#10
11-04-2005, 11:08 AM
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Yep. On all the M103s I deal with, I get a helper to assist me in getting all the wires into the plastic strips and we use electrical tape in about 3 places.
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Auto Zentral Ltd.
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