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#1
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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] |
#2
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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. |
#3
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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] |
#4
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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 |
#5
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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] |
#6
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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 |
#7
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I assume there are torque specs for that lower bolt?
Can you elaborate on the shims required?
__________________
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] |
#8
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I'll need to dig to fine the torque #'s but I remeber it not being terribly tight..
There are a large selection of shims that go b/w the rocker and the lifter. It's critical that you get said spacing correct. There is a special tool used, or you can get by w/ a set of feeler gauges. Typing out the procedure is a bit long winded.. 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 |
#9
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Is the procedure in the FSM?
__________________
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] |
#10
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might be... it's in my printed manual..
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 |
#11
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Okay, I'll have to go through the disc and have a peek.
__________________
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] |
#12
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i thought that motor has hydraulic lash adjusters.
what are shims for? 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. |
#13
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Swap the cams from your spare engine. Swap the rockers, too. Make SURE to match the rockers (exhaust on cyl #1 goes back on exhaust on cyl #2, etc). Otherwise, you'll need all new rockers.
And the m117's older than 4.5's do have hydraulic adjusters, so I'm curious just like Tom W as to what you'd need shims for...
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k |
#14
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i think tomguy meant newer than 4.5s right?
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. |
#15
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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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