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#1
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Glow plug replacement....is each generation of engine worse then the last?
With every generation of Mercedes diesel engines; does replacing the glow plugs get harder and harder?
Doing the glow plugs on my 617 was fiddly at times but overall straightforward and simple. I would imagine that a 616 is even easier. My 603? A complete pain in the rear and I suspect a 602 isn't much different. I've also read plenty of threads about 606 glow plugs breaking and causing a total nightmare. If the trend continued I can only imagine what the job is like on engines made in the last ten years....
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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out 1990 300SEL Smoke Silver (Parting out) 1991 350SDL Blackberry Metallic (481) "The thing is Bob, its not that I'm lazy...its that I just don't care." |
#2
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It's not bad. I've had all the engines pre-00 and they're all straight forward. OM60X engines are all basically the same. One just risks breaking a glow plug body in the head if they haven't been reasonably maintained (excessive carbon build up, removing plugs on a cold engine, etc).
Just more stuff to get in the way is all. For me it makes a good reason to get some preventive maintenance done.
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Allen Kroliczek Oak Grove Autosport | Oak Grove Autosport 01 G500, 82 300TD, quite a few more..... |
#3
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The 60x heads are a crossflow design, better for performance and economy.
The downside is what you've found out, more difficult to get to some items. Use quality glow plugs and ream out the holes.
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83 SD 84 CD |
#4
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You should try the later OM611/612/613 CDI engines. They shear off pretty much 50% of the time. Thankfully they still start with all of them gone! I have one stuck in my OM611 now, I'm just going to leave it.
I imagine the later (OM648 etc) engines are even worse.
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1991 W124 250D - 130k Miles |
#5
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I just did mine on the 300TD, the glow plugs themselves were easy to get out, ream and install. It was the install of the intake manifold, socket wrench gynmastics to tighten up the 12 bolts, fussing with the GP wire loom, getting all the injection lines clipped back in ohh and of course replacing the return lines(might as well right )because guess what I managed to break one. All in all, I got what I bargained for and then a bit more.
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Treetops 06 E320 CDI 127K Miles 87 300TD 231K Miles 99 E300 269K Miles-Sold |
#6
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I went thru all that this summer on my 603. Remove intake and other stuff, ream the holes, new plugs, clean intake, etc. But I'm glad I did. It's only dipped into the upper 20's so far but it starts quick and runs smoother when cold than it has since I've owned it. It was way past overdue.
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1991 350SDL 350k+ miles |
#7
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Quote:
617 GP's are pretty easy, but depending on the cylinder, can't use a socket...so therefore can't use a torque wrench. 606 is a bit more difficult...but remember...warm engine, lots of PB Blaster, don't exceed 40Nm of off-torque. If it doesn't pop by 40Nm, add PB blaster, go inside and have a refreshment while you wait. Repeat. The 648 is much easier than 606. I've only changed one GP on the 648 in the last 109,000 miles, but employed the tried-and-true 606 removal technique above.
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Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k |
#8
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This thread reminds me of the trouble I had getting #5 GP out of my 617. It unthreaded but I couldn't manage to get the plug the rest of the way out. It was swelled at the tip. Since I had 1-4 done and I was getting pissy in the cold weather, I had an idea. Fire up the engine and let the cylinder pressure shoot it out. Well, it worked! The cops on the other side of the parking lot were not too impressed as they were responding to a domestic dispute. The sound of what a .45ACP makes across the parking lot left a few stains in their drawers, I imagine. I never did find that glow plug...
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge |
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