Erection problems

1965 - 1972: 250S, 250SE, 300SEb, 280S, 280SE, 280SEL, 280SE 3.5, 280SEL 3.5, 280SE 4.5, 280SEL 4.5, 300SEL, 300SEL 6.3, 300SEL 3.5, 300SEL 4.5
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ADow
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Erection problems

Post by ADow » Thu 24 Nov, 2005 9:30 pm

No this is not "that" sort of spam. My 108 aerial has either been partially erecting or not at all. The aerial motor is fine. Can any Ozvetter explain the principle behind the erection of the aerial. Then I can probably remove it and repair it.
Thanks
Alastair
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

HansKruger
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Re: Erection problems

Post by HansKruger » Thu 24 Nov, 2005 9:49 pm

ADow wrote:No this is not "that" sort of spam. My 108 aerial has either been partially erecting or not at all. The aerial motor is fine. Can any Ozvetter explain the principle behind the erection of the aerial. Then I can probably remove it and repair it.
Thanks
Alastair
...and here I thought we had another nasty spammer on the forum, had the same problem a few months ago, bit of RP7, available at any hardware, hobby store should do the trick.

You see the problem is not erection, it's lubrication :wink:

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ADow
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Post by ADow » Thu 24 Nov, 2005 9:53 pm

Thanks for the tip - I'll give it a try - but I'd still be interested to know the principle behind the aerial. What makes it go up?
Alastair
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

Stephen
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Erection Problems

Post by Stephen » Thu 24 Nov, 2005 10:12 pm

Hi Alastair,
A couple of years ago I had a similar problem and managed to repair my aerial and it is still working today. I don't think mine was original equipment but I would imagine that the principle is the same.
Basically the aerial is pushed up and pulled down by a nylon or plastic stem that rolls off and on a drum driven by the electric motor. There are two contacts that open when the aerial has reached the full extent of travel i.e. one set when it reaches full extension and one set for full retraction, (by way of a cam on the end of the drum), thereby cutting off power to the motor. It is quite obvious when you see it.
Check the wiring connections, and that the contacts are clean and making adequately, or, as in my case, that the nylon (?) stem isn't broken or detatched from the drum. I can't quite remember how I refitted the stem to the drum, but I think I may have used a soldering iron to melt the end in some way?
My aerial is driven by a two way toggle switch, not the ignition switch, which may bring a relay into the picture.
I'm certain that the stem is probably broken, and most of this is superfluous and probably just confusing you? But I think if the aerial stem is not lubricated regularly, the stem is probably put under a lot of strain.
Anyway, good luck and best wishes,
Stephen

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ADow
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Post by ADow » Thu 24 Nov, 2005 10:36 pm

Thanks Stephen
Presumably you removed the whole assembly from behind the RH front wheel before making the repair? Was that reasonably straightforward?
Alastair
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

Stephen
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Post by Stephen » Thu 24 Nov, 2005 10:58 pm

Yes, from memory I removed the wheel and the panel to the rear which accesses the motor/gearbox assembly. I can't recall exactly how it is secured, most likely a locknut arrangement, but it must have been fairly straightforward as I managed it. I also remember having the panel on the inside of the passenger foot area off as well but that may be unnecessary to remove the aerial assembly, although it might have been to get a bit more length of the wiring. I'm sorry, it was a while ago now.

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ADow
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Post by ADow » Fri 25 Nov, 2005 11:21 am

Stephen
That makes sense to me - In the past I've traced the aerial power wire from the radio switch to the battery to the aerial and it does leave the interior of the car through a hole on the RHS of the footwell.
Presumably you also had to undo the external locknut at the base of the aerial?
Alastair
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

Stephen
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Post by Stephen » Fri 25 Nov, 2005 6:45 pm

Hi again Alastair,
Sorry for the delay in responding but it was late in Sydney and I logged off. Yes, I've had a quick look and if you remove the locknut the aerial assembly ( aerial, motor/gearbox ) should drop straight down. If your unit is like mine, you will be able to remove a cover and all should then be revealed. When I did mine there were NO springs or things that came out when the cover was removed. It was pretty staightforward, albeit, a bit fiddly.
Good Luck
Stephen

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ADow
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Post by ADow » Mon 28 Nov, 2005 11:10 am

I've taken the lubrication option as a first step - basically saturated the shaft in CRC by holding a cloth behind it and spraying the aerial while turning the radio off and on. The now aerial extends to its full length which makes me think that the plastic/nylon stem must be intact.
It's working OK now.
Thanks Stephen and Hans for the advice.
Alastair
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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ADow
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Post by ADow » Sun 11 Dec, 2005 11:36 am

Two weeks on and the aerial is working well. I have lubricated it before but only got short term benefits. This time I soaked the shaft on three consecutive days in CRC (holding a cloth behind it so it didn't CRC the windscree) and then turned the radio on and off several times. I suspect that the CRC has now soaked down to the base of the aerial and is providing a reservior of lubricant.
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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OzBenzHead
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Post by OzBenzHead » Sun 11 Dec, 2005 2:12 pm

Alastair:

That's good news; it seems it was nothing but a case of dry shaft (!).

Now that it's working, why not run some machine oil (as in sewing machine, or hair clippers oil) down the shaft; it should last considerably longer than the CRC (which is little more than flavoured kero). Pour it on, run the aerial up and down a few times, and repeat - maybe twice more.
OzBenzHead
Currently owned:
1965 W112 300 SE/C
1983 C126 380 SEC

and formerly:
1955 W180 220a
1965 W111 220 S
1970 W108 280 SE (my first Benz)
1973 W116 280 SE Crayford Estate (previously owned by Rolf Harris)
1980 W116 280 SE
1989 W124 300 E
1992 W201 180 E
1992 W201 190 E 2.0
+ numerous W108 and W116 rolling spares

and prior to my M-B enlightenment:
53 other cars of many nations, but mostly British oil-leakers (including 14 Rovers of the 50s and 60s) cursed by Lucas the Prince of Darkness. First car owned (at age 13): 1953 Fiat. Learned to drive in: 1927 Nash utility paddock-basher & Grey Fergie tractor. Driven distance (logged as at 30 June 2016): 4.6 million km.

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ADow
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Post by ADow » Sun 11 Dec, 2005 3:12 pm

Flavoured kero :lol:
Will take your advice re the oil.
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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ADow
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Post by ADow » Mon 12 Dec, 2005 7:14 pm

Have applied the Singer sewing machine oil and turned the radio on and off a few times. After a moments sticking :o it's now working luvely with minimal hesitation, sticking or clanking.
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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bruceT
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Post by bruceT » Tue 13 Dec, 2005 7:48 am

From what I've read on other forums, I think you might find that the oil trick will be short-lived. This problem is usually due to worn "teeth" on the nylon stem. The nylon replacement inserts are available on eBay (US) for around $15.
Cheers
Bruce

http://oztayls.blogspot.com/
http://oztayls-shesha.blogspot.com/

Past Benzs:
1976 W123 300D (Running on SVO (Straight Veg Oil) since June 2006-Sold in Nov 2008)
1982 W126 280SE - Unregistered (Free to a good home!)
1993 W124 300D (running on 100% used cooking oil, no conversion and no glow plugs!)

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