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post #11 of 22 (permalink) Old 07-25-2016, 07:40 AM
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Opps , see that now one of those "newer cars "

Ron
1999 E320
62 220b
84 300SD
72 450SL
71 220 Parts
81 380 Sl - Parts
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post #12 of 22 (permalink) Old 07-25-2016, 10:00 AM Thread Starter
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Originally Posted by ejboyd5 View Post
Change the ignition coil and see if the problem disappears.
Thanks, one of the things I suspect it might be.
Is the coil of the 300 shared with some other models 280, 220?
Mine has twin points.
Any aftermarket recommendations to try?
I also wanted to change the spark leads, but aren't no longer available, also the distributor cap is 410 plus, ouch.
Thanks.
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post #13 of 22 (permalink) Old 07-25-2016, 03:40 PM
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Vehicle: 2002 SL600 Silver Arrow, 1966 300SE Cabriolet, 2009 Smart Cabriolet
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Do not under any circumstance fiddle with any of the injection linkages unless you absolutely know what you are doing. A change to any part of the linkage requires a change to every other part.

Also, as mentioned by others you could be experiencing fuel vaporization in the injection lines between the injection pump and the injectors. If the check valves between the pump and the ejectors are damaged or contaminated they'll not hold pressure thus allowing the fuel therein to vaporize. An injection pump re-build might be in order.

One other thing. With the dual points in the distributor do not leave the ignition on for more than a few seconds without starting the engine, doing so can cause considerable arcing in the points and rapid deterioration of said points.

I hope this helps
Aloha
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post #14 of 22 (permalink) Old 07-26-2016, 05:26 AM Thread Starter
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Originally Posted by Silberpfeil View Post
Do not under any circumstance fiddle with any of the injection linkages unless you absolutely know what you are doing. A change to any part of the linkage requires a change to every other part.

Also, as mentioned by others you could be experiencing fuel vaporization in the injection lines between the injection pump and the injectors. If the check valves between the pump and the ejectors are damaged or contaminated they'll not hold pressure thus allowing the fuel therein to vaporize. An injection pump re-build might be in order.

One other thing. With the dual points in the distributor do not leave the ignition on for more than a few seconds without starting the engine, doing so can cause considerable arcing in the points and rapid deterioration of said points.

I hope this helps
Aloha
I've never touched the linkages, as I've heard in the past they can be tricky to setup.

Didn't know about the points being prone to arcing when the ignition is on. I'll take care.

I think it'll be a trip down to a Roger Edwards after the summer to get it looked at.

Another thing that bothers me is the air suspension. Although not too bad, it does stop me from enjoying the car when having to wait for it to level out.
I've considered a spring conversion, and to safety store the bellows, don't know.
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post #15 of 22 (permalink) Old 07-26-2016, 05:39 AM Thread Starter
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Silberpfeil,
We have the same car, and same year. How has yours been.
I bought a second hand engine and gearbox for mine a few years back just as a backup, and it seems I made a wise move going by some prices of these car's parts. It included dynamo, air suspension pump etc. From a chap called John Billias here in the UK who sadly since past away. He said to me buy it, you'll not regret it. So true.
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post #16 of 22 (permalink) Old 07-26-2016, 08:31 AM
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First of all please do not ruin your car by removing the air suspension, it won't function correctly and it will be worthless. Ninety percent of the time the bellows are just fine and the problem is one or more of the leveling valves or the main control valve are leaking. I'm sure you can have them rebuilt somewhere over there. There are several places here in the US that do exceptional rebuilds on the valves. Google "Martin Werminghausen" or "Star Motors", I'm sure either one will ship overseas.

Another thing most people ignore is keeping the anti-freeze bottle serviced with ethyl alcohol. The tinniest ice crystal will chew up an O ring causing a leak. The air system is a miniature air conditioner, it compresses a gas (air) and then it expands out into the system causing a drop in temperature, if there is moisture in the air it will freeze.

Good job on the spare engine. I believe a proper overhaul can run $30,000.00 to $50,000.00, it is after essentially a 300SL engine.
Hope this helps
Aloha
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post #17 of 22 (permalink) Old 07-26-2016, 09:54 AM Thread Starter
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Originally Posted by Silberpfeil View Post
First of all please do not ruin your car by removing the air suspension, it won't function correctly and it will be worthless. Ninety percent of the time the bellows are just fine and the problem is one or more of the leveling valves or the main control valve are leaking. I'm sure you can have them rebuilt somewhere over there. There are several places here in the US that do exceptional rebuilds on the valves. Google "Martin Werminghausen" or "Star Motors", I'm sure either one will ship overseas.

Another thing most people ignore is keeping the anti-freeze bottle serviced with ethyl alcohol. The tinniest ice crystal will chew up an O ring causing a leak. The air system is a miniature air conditioner, it compresses a gas (air) and then it expands out into the system causing a drop in temperature, if there is moisture in the air it will freeze.

Good job on the spare engine. I believe a proper overhaul can run $30,000.00 to $50,000.00, it is after essentially a 300SL engine.
Hope this helps
Aloha

Thanks again. I've heard that it would devalue slightly, hence why I would want it easily reversible to original.
I had the bellows replaced around 5 years ago, and only did so because the old ones were slightly cracked although not leaking. I think I only notice the slight loss in air after the replacement but can't be sure.

I had no idea in the ethyl achohol servicing.

I'll Google those names. Thanks.

No surprise at the price of the engine, Mercedes Poole wanted 400+ for the distributor cap alone.
I'll be guarding that spare engine with my life haha. (and skate gearbox, propshalft, and rear axle assembly).

Aloha.



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Mercedes 300SE cabriolet
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Porsche 993 cabriolet.
Mercedes clc350 nice but boring, has to go.
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post #18 of 22 (permalink) Old 07-26-2016, 02:50 PM
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A "slight" devaluation would be for one of the mostly uninformed who due to ignorance think the air suspension is an unreliable maintenance nightmare. Anyone who understands and appreciates the system probably wouldn't touch the car without a value reduction equal to the considerable cost of a complete restoration of the suspension.

I've had mine for nearly 20yrs. and have never had the slightest problem, in fact about once a year from January to March the car will sit almost unused and the suspension doesn't drop even 1mm.

I can't imagine how poorly the car would handle with the air suspension removed. For one, the air suspension cars don't have nor do they need the rear axle compensating spring, coming up with a way to mount said spring might take some real engineering and fabricating work.

If your avatar is a pic of your car it looks like it is DB462 Beige Metallic, that's what mine is with dark green interior and top.

Aloha
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post #19 of 22 (permalink) Old 07-26-2016, 04:05 PM
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Originally Posted by Rialas View Post
No surprise at the price of the engine, Mercedes Poole wanted 400+ for the distributor cap alone.
Someone on the forums and on ebay had maybe 80 of the correct distributor caps and was selling them for $100 each. I bought one as a spare. I don't remember who it was but if you search this forum and peachparts I think you will find it.

The cost of rebuilding the engine is huge, but it's not because it's basically a 300SL engine, it's because basically it's a very complicated engine with lots of very expensive parts and is labor-intensive as well. Some of the parts might have to be fabricated. Whoever said $30,000 to $50,000 is correct I think, and getting a spare good engine is certainly worth it if you have one available.

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Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #20 of 22 (permalink) Old 07-26-2016, 09:03 PM Thread Starter
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Well thanks everyone.

Firstly, I will definitely not be doing any suspension conversion, and will take my time to find someone that can overhaul the air suspension back to its former glory. I didn't know fabrication would be needed so that's a definite no go.

If anyone has a link to those distributor caps, or any other useful bits, that would be appreciated.

Around 10 years ago I also bought a 300se fintail from Mr Billias as I wanted a regulator and dynamo pully for mine. I had to buy the whole car as he wasn't prepared to sell just those parts. I wish I had kept it now knowing what the engine alone costs.
Ended up giving the car away to a dealer. Oh well.

Mercedes 300SE cabriolet
BMW 335i M sport
BMW Z4 3.0si coupe
Porsche 993 cabriolet.
Mercedes clc350 nice but boring, has to go.
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