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1987 420 SEL
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Discussion Starter #1
Just came back from a MB specialist who diagnosed my car in need of new Cam Shafts. He suggested that I get a upper cylinder rebuild. Of course, he wanted a couple thousands to do everything. I know that I definitely need new Valve Seals and Guides also. I'm thinking of getting a new remanufactured head cylinder which would include the valve seals, guides and the necessary machine work already completed. But I have 2 questions:

1. Will the new cylinder put stress on the lower part of the engine?

2. When doing the cam shafts do all the rocker arms have to be replaced?

How would you proceed? Your thoughts will be greatly appreciated!!!
 

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1980 LWB 280GE
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3,504 Posts
Yes you should replace rockers when replacing the cam. But I'd do exactly as you are considering. Replace the cylinder head with a remanufactured one from a reputable source. Someone who is in the business of rebuilding them can do a better job than one who is doing a one-off. There is no danger to the lower half of the engine from replacing the head.

These folks have the highest reputation:
http://www.mercedesengines.net/recon_heads.html

-Dave G.
 

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Depends on the day!
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To not put new rockers on is a false economy, the old rockers from a worn out cam will wear out your new cams right quick.

In regards to metric, they can do good work, but they are expensive and I've seen the #'s from some of their engines and was not terribly impressed. I use a fellow up in NY who does the machining for the biggest and best dealers on LI, NYC etc.. He's a 1st generation German who's work I would put up against anyone (I ship my heads from Atlanta to him).

Be careful w/ cam choice, there are a LOT of aftermarket buggers, some hold up, some don't.

The bottom end it nearly indestructible, no worries there.


Jonathan
 

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1987 420 SEL
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Discussion Starter #4
I'm glad that this MB forum exist. When I was talking to the owner of the MB place that I was referred to this morning. He was talking to me like I didn't know anything. But all the time, I couldn't wait to post my findings for you fella MB owners to take part in expressing your thoughts. I know have to make some phone calls to get the process started. Thanks.
 

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1991 560 SEL
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260 Posts
I had a bad cam on my 560 when I bought it. I finally got around to replacing it a couple years later. Cam was less than $300 from Performance Parts. Didn't change all the rockers. Just changed the bad one. No problems in the last 60,000 miles with it. Cam is pretty easy to change. Only danger is if you mess up head bolt threads when you pull it apart. Should you change all the rockers? Sure. Did I? No. Did it hurt? No. IF you have lots of money go ahead and change all the rockers.
 

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1987 420 SEL
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Discussion Starter #6
What are some of the recommend OE or OEM Cam Shaft replacement manufacturers? Or, can you suggest an online source to purchase the Cams from? Thanks.
 

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Sorry, but I have to disagree w/ the rocker issue. You can't tell if the rockers have lost their correct convex radius just by looking at them. Just being out a few thousandths of an inch will cause issues down the road. You have gone XXX,XXX amount of miles on these cams, the amount of material left on the rocker will be far below what was original.

If you talk to any cam grinder/manufacture they will Insist that putting new rockers is a necessity when using one of their products. Personally, I wouldn't warranty my work if someone insisted I re-use their old rockers.

Also, if you choose to use your old rockers you'll be mighty pissed when one of them fails and takes your nice new cam with it.

Give Isky, Crane etc a call and ask what they think about using old rockers on their cams.

New rockers isn't about spending a lot of money because you have or don't have it, it's about doing the job right the first time.

Jonathan
 

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Prochambers - 3/7/2005 12:04 PM

What are some of the recommend OE or OEM Cam Shaft replacement manufacturers? Or, can you suggest an online source to purchase the Cams from? Thanks.
I'll use lemforder AM cams, if I can't get them I use MB's. A lot of the other manufactures cams are coming out of italy, brazil, china etc..in other words POS cams.

I always recomend you pick up your bits from me..I'll look up $$ and PM you.

Jonathan
 

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1987 420 SEL
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Discussion Starter #9
Hi Jonathan,

I usually try and go with the Lemforder or Febi products. Lemforder is 1st on my list. Please provide me with your price and i'll get back to you. Thanks.
 

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1980 LWB 280GE
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Prochambers - 3/7/2005 11:53 AM
....He was talking to me like I didn't know anything....
Maybe time to find a new place. Heck, the forum might be a good place to ask if there are any other users in your area. Otherwise check your local MB clubs and such. I'm a firm believer in general impressions. You can usually tell just by talking to someone for 5 minutes whether or not you can trust them, and implicit trust is vital in the relationship between me and the very few mechanics that I'll let touch my cars. Of course, as a result I do nearly everything myself. [:)]

Especially given your location, sounds like J's man downstate in NY might be a great way to go. You can't beat personal recommendations based on experience.

All the best,

-Dave G.
 
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