Glow plug light warning is on. Researched forum to find DIY replacing glow plugs but only found 2006 model DIY information with needing 30 minutes to do. My car 2007 bluetech with 54,000 miles. Do I need to replace all 6 or just the bad one. Does someone have a illustrations in removing parts to get to the glow plugs. Thank in advance
I'm going to replace all 6. Car has 54k miles and had it since new. I have the Star Service CD and have already done routine maintenance on the car, oil changes w/filter every 10k, air filter, fuel filter (twice so far), dust filter.
I pulled one glow plug with an 8mm deep socket and 3/8 torque wrench. The plug was made by NGK, and indicates it is Mercedes Part No. A001-159-57-01, NGK Part No. CZ302, 7 volt. Called Mercedes Tysons Corner and was told the replacement part is Mercedes No. A001-159-66-01 for my '08 E320. I stongly suspect it also fits '07 and '09 E320's. Checked online with RMEuropean who claims to have OE Mercedes glow plug No. 001-159-66-01 which is made by Bosch. More research revealed this plug is not Mercedes No. 001-159-66-01 and is actually a 4.4 volt plug of an earlier version, A001-159-50-01 which works on '05 and '06 E320 CDI's and 3.0 liter Mercedes Sprinters. Phoned Bosch and talked with a tech who stated he did not recommend installing the 4.4 Bosch plug into my car and he further stated that Bosch has never been the OE supplier to Mercedes for my Bluetec. Phoned RMEuropean to inform them of the snafu. They've been great to deal with on everything else.
Back to square one. Called several dealers' parts departments, some of which were willing to provide information since I was hoping to buy a set of glow plugs aftermarket and save some $$ ($20 vs. $70-90). Piecing all the information together revealed that currently, NGK is the supplier to Mercedes of this plug, and that it's 7 volt just like the one which the factory installed in my car. Phoned NGK and they do not
sell this plug to anyone other than Mercedes. Checked with Beru -- was told they don't make the plug in this spec either. So there you have it. Only place to get it is apparently your local Mercedes parts dept. I saved some money by going to getmercedes.com which is a Mercedes dealer willing to sell at reduced prices ($57).
To install the glow plugs on 07 through 09 E320 Bluetecs, you must have the car at operating temperature (for easier removal), remove the engine cover, remove the air duct that goes from air filters to the turbocharger, then the tube harness (screwed down with two aluminum bolts) which is above the first glow plug as it appears as a square plastic cap with three slits on the top and wires coming out of it (it's first and front on the left side of the engine looking from the front of the car). Now each plastic cap with the electrical wires are exposed. Lift each cap gently with a needle nose pliers to remove. Use an 8mm deep socket with a torque wrench, applying no more than 25nm or 18lb pressure while removing it straight out. Do not bend or rock the wrench while removing as the plug is very fragile and can break off if you're not careful. If the plugs look dirty or corroded, may want to clean the glow plug recesses with cylindrical (perlon) 10mm brushes. Otherwise, insert the new plugs, screw in, and torque to 10nm (8lb). Replace plastic caps, bolt down tube harness, re-install air duct, engine cover, and you're done.