Questions about a W109 6.3 - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 01-23-2013, 07:10 PM Thread Starter
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Questions about a W109 6.3

Hey All,

So growing up my dad had a lot of Mercedes he rifled through (he restored and sold car for a living). As I'm now trying to collect the cars he liked most I've started thinking about getting a W109 series car. Of course I'd like a 6.3. Obviously I grew up restoring cars so I'm no stranger to the problems of a classic.

We had a 6.9 that I loved as a kid, but there is just something so painfully beautiful about the W109 6.3.

So, what is a good one worth in today's market? What are the major things to look out for? Any of you use your 6.3 daily?

Thanks for any tips!

Regards,
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post #2 of 13 (permalink) Old 01-24-2013, 12:01 PM Thread Starter
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Anyone? Trying to decide if my '74 Alfa Spider should get a garage friend! haha
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post #3 of 13 (permalink) Old 01-24-2013, 01:54 PM
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you should not buy a car like that as a daily driver , that would be a nice weekend cruiser .
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post #4 of 13 (permalink) Old 01-24-2013, 07:03 PM Thread Starter
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I guess I didnt really mean as an every day driver, more as a regular weekend car. I have a bmw 335 for daily use plus my Alfa for the weekend. I've just always had a soft spot for classic Mercedes.

What is a good 6.3 worth though?

Is it more worth while to just buy a 280 with the 4.5?

Thanks,
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post #5 of 13 (permalink) Old 01-25-2013, 06:03 AM
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You should ask that question on the M100 web site, the answers would be interesting. A few years ago I was actively looking for a nice 6.3 and found one in Florida that had been totally rebuilt by east coast 6.3 specialist Star Motors. I called them about the 6.3 and after discussing the potential cost of 6.3 repair, they talked me into buying a really nice 280SEL 4.5 instead, I couldn't be happier. The 6.3 is a torque monster but some parts of the car such as fuel pump, air suspension, transmission and motor can be very expensive to fix, the 4.5 parts are almost all easy and cheap to find, and a 4.5 has plenty of power. A near perfect 4.5 should go for 15-20k and a similar condition 6.3 would be about 25-45k. The biggest financial mistake would be to buy a cheap 6.3 that needs work, fixing it will cost you a small fortune that you will not get back when you sell it. I think the 280 sel 4.5 is the best choice for cost/performance/style, there is a nice one for sale on ebay located in SC right now.

Last edited by SCCA Racer; 01-25-2013 at 07:46 AM.
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post #6 of 13 (permalink) Old 01-25-2013, 09:16 AM
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comparatively even a w109 300sel 3.5 can be expensive to maintain as it has the air suspension though the 3.5 engine is not in the rarified league
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post #7 of 13 (permalink) Old 01-26-2013, 04:26 PM
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No reason why a 6.3 can't be a daily driver, though the cost to repair can be prohibitive. I have a 108 w/4.5 engine and love the hell out of the thing. I drive it daily and use my much newer BMW soft top as a once a weekend driver now.
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post #8 of 13 (permalink) Old 01-26-2013, 07:59 PM
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Vehicle: 1996 W210 E320 ELEGANCE, 1972 W108 280SE 3.5, 1969 W108 280S, 1971 300SEL 3.5
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I've got a 300SEL 3.5 and I would rock that as a daily, I've just done most of the suspention rubbers and replaced the shocks and rebuild the brakes, all calipers, replaced the rotors and pads, rubber brake lines and the master cylinder on the old girl and she rides like a modern car and stops like and older car does, just need to reteach myself how to apply the brakes a little bit sooner.

All the stuff I did was basic lack of maintenance on the previous owners part and the fact that she sat for about 10 years before rescue, once everything is done I won't need to see the underside for a long while.

In terms of the Air Suspention the main thing to look out for the valves and the bellows (air bags), mine look bad and perished but hold 200psi of air and do not leak, the height valves leak at an O-ring at the pivot shaft but are not easily serviceable for a DIYer but if the car stay up for a few days you should be good if you drive it daily.

To sum up, the stories of these cars being super pricy to maintain is people dropping a lot of coin in a short period of time and it's all maintenance issues, unless you blow the engine or trans, then you are in a different world, but the guys on the M-100 forum can help and advise you on who to go to and what to look out for.

Cheers
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post #9 of 13 (permalink) Old 01-26-2013, 09:00 PM
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109 3.5 repair

How much does a set of front and rear air bellows and air control valves cost?
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post #10 of 13 (permalink) Old 01-27-2013, 04:20 AM
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Quote:
Originally Posted by adler View Post
How much does a set of front and rear air bellows and air control valves cost?
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I've seen bellows prices go from $450 each to as little as $270 each, fronts cost more than rears but only by a few bucks, Google the part numbers and it will list different suppliers and their prices.

The part numbers are: 112 320 0017 front
112 320 0021 rear

As for the valves, they need to be reconditioned, as new ones are NLA and have been for years, I've read on other forums that they can be done and there are only about three really good people set up to do them properly, one in the US, one in Europe and one in Melbourne Australia. I don't have names and contact details as I have not used them.
I'm looking into an aftermarket alternative.

I hope this helps.
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