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#1
04-10-2007, 06:33 PM
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M117 rounded cam lobe, what are my options?
Well, finished the guides in the 380 that has w/ the M117 swap and noticed one of the intake lobes on the drivers bank is wiped.
 Can the cam and the rocker be replaced alone?
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I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] 
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#2
04-10-2007, 09:20 PM
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i would think yes. probably replacing all the rockers would be recommended in case some are worn, but i would think you would be ok to just change the cam and one rocker.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#3
04-10-2007, 09:21 PM
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Cool. I have a complete spare Euro 500 motor that needs to be rebuilt, so I may steal the cams from it.
 Figure I'd replace them in pairs. I could also do the rockers too.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#4
04-11-2007, 10:15 AM
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get new rockers while you are doing it..
Or, we can send you a set of AMG spec cams;-) Setting the lash can be a bit of a PITA w/o a large selection of spacers/shims. Jonathan
__________________
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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#5
04-11-2007, 11:16 AM
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I should use new rockers as opposed to the used ones on my spare motor?
 Another thing I noticed, which I believe attributed to the lobe issue, this locknut at the base of the head was FINGER tight! 
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#6
04-11-2007, 11:24 AM
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Yes, I would use new rockers. You can get away w/ the old ones as long as you keep them w/ their respective lobe.
They do loosen w/ age/time..not uncommon. Jonathan
__________________
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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#7
04-12-2007, 12:41 AM
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I believe he did..however, they Still have shims even w/ the hydraulic lifters. I'll post a pic or two from the EPC if need be later on.
Jonathan
__________________
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
04-12-2007, 06:00 AM
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really?
where do they go? and what purpose do they serve? tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#9
04-12-2007, 09:43 AM
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They go here b/w the spring retainer and the rocker arm as can be seen in the attached images (#44)
You need to set the static spacing when assembling these cams, the hyd. compensator can only do but so much. Jonathan
__________________
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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#10
04-12-2007, 07:37 PM
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Speaking of wiped cams.....
At lleast three years ago, ZDDP, a zinc compound, was greatly reduced in on-road engine oils. The reason was aledgedly, the ZDDP was causing CatCons to fail. ZDDP, Zinc, is a major wear inhibitor in cams/lifters. On the racing scene, just about everybody has switched to roller cams now that all of their flat tappet cams have been destroyed because of this removal of a critical wear reducer. Those that can't afford to buy roller kits are using off-road only racing oil. Regular Racing Oil has had its ZDDP removed as well. "OFF ROAD ONLY" racing oil is the only gas engine oil that still contains the normal compliment of ZDDP. An alternative is Diesel engine oil, such as Delvac, Rotella, Dello. etc. I now run Rotella T in my engines, other than the 97 C280 and the 2001 E430, which get Mobile1.
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Thank You! Fred 2009 ML350 2004 SL600 2004 SL500 1996 SL600 2002 SLK32 2005 CLK320 cabrio 2003 ML350 1997 C280 Sport
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#11
04-12-2007, 08:58 PM
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FYI, the new diesel oils have had their ZDDP Greatly reduced as of 2007 with the advent of the new diesels. You can still get the old style but you have to buy it in a drum.
I'm using GM's cam/lifter additive that brings the levels of ZDDP etc back to as they used to be. Jonathan
__________________
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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