Mechanical repairs

1979-1991 280SE, 300SE, 300SEL, 380SE, 380SEL, 380SEC, 420SE, 420SEL, 420SEC, 500SE, 500SEL, 500SEC, 560SEL, 560SEC
Post Reply
billiebenz
Dernburg Wagon
Posts: 8
Joined: Wed 28 Mar, 2018 9:06 am
Model you own: w126
Region: New South Wales
Location: Katoomba

Mechanical repairs

Post by billiebenz » Thu 29 Mar, 2018 8:01 am

Hi All.
I am starting to look at sorting out some minor issues on the 420SE and am looking for advice on the following-
- reverse clutches noisy in the gearbox- is this a total rebuild at 130K and should I just bite the bullet when the box is out and have it overhauled?
-The fuel return under the air filter on the side of the injection system is weeping....stinks up the cabin... replace the whole unit?
-Any ideas on where to get hydropheumatic shock for the rear? they have pounded out and are making a clunking noise over sharp bumps.
- The ignition key sometimes gets stuck in the barrel.....major freak out here as I dont want the key to snap off in there.
-Why would the sunroof suddenly start catching on the wind deflector?
Any feed back on the mechanics that operate from the rear of Silver Star Spares in Sydney?
Thanks in advance.
Lewis

CraigB
OZBENZ Admin
Posts: 4858
Joined: Thu 23 Jun, 2005 2:18 pm
Model you own: I own multiple different models
Location: Hawthorndene (Adelaide)

Re: Mechanical repairs

Post by CraigB » Thu 29 Mar, 2018 10:12 am

Hi Lewis

Others will know more on bits of this but will just share my thoughts and see what else is said too. First step is getting recommendations for Sydney. If you search you will probably find posts on here but I am sure people will make specific recommendations. In particular i would suggest finding a trustworthy trans place. At 130k I would have thought the trans would be in largely good condition, but the right place should be able to pull it down and measure and replace exactly what is needed. But if you have noise then i think it does need to be pulled and stripped down. Fuel return pipe? Not something usually a problem I think so if someone is wrecking a car might be able to get the right part cheap. I don't think i have heard of 'pick a part' type places in Sydney but that sort of thing would work well.

Are you sure it is the strut that is the problem and not the Spheres? Sphere is much more common, readily available and easy to replace and tends to give a harsh ride and thumping. Any number of suppliers for spheres but if you are taking to a recommended mechanic they will know. They are nitrogen filled and give that
flex to the suspension and after a while just let go. Can also get thump from top strut and there is info on here how to easily test if that is a problem.

New ignition barrel is cheap and easy to replace, but get onto it and don't leave it. There is a youtube video that shows you how to easily to that.

Over the years i have had lots of dramas with those tilt/slide sunroofs. Be gentle if having trouble because those slides or carriages for them are very expensive and hard to find. The deflector part is pretty simple though so have a look and it will probably be clear how it works - has a ramped lever and maybe that has come off?

Last point - if you don't have receipts for timing chain guides etc being changed then make that a priority. You can measure chain stretch and maybe the tensioner is ok - but an easy part to replace, but if the thin plastic guide breaks - $20 or so part and it can throw the chain off and destroy the whole motor requiring many thousands to rebuild. You would be surprised how often this happens just after someone buys a car.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

billiebenz
Dernburg Wagon
Posts: 8
Joined: Wed 28 Mar, 2018 9:06 am
Model you own: w126
Region: New South Wales
Location: Katoomba

Re: Mechanical repairs

Post by billiebenz » Thu 29 Mar, 2018 10:48 am

Thanks for the information craig.
The car has been well maintained and I have receipts for every repair done over its 28 years.
The timing chain was replaced at 110K which was one thing I was on the lookout for.
I will look at your suggestions as to the suspension thunks and the gearbox I think I will get a rebuild done when its out and I know its good then.
The sunroof I can wait and soon I will spend some time looking at why the deflector is not coming down enough.
Cheers
Lewis

KimB
300 SLR
Posts: 1556
Joined: Thu 20 Dec, 2007 5:57 pm
Model you own: w126
Location: Sydney

Re: Mechanical repairs

Post by KimB » Thu 29 Mar, 2018 11:00 am

Re the rear struts. Sounds like it's the struts that need replacing rather than the spheres. Had the same problem in our 380SEC. Make sure you replace both struts and not just one.

If it's the spheres, then the back of the car bounces all over the place like a bucking bronco! You can easily tell the difference.

Re wind deflector. Probably just needs an adjustment. Again, had same problem on our 300se. Never bothered adjusting it, just closed the sunroof very slowly when it came close to the wind deflector.

Cheers
Kim
W126 86 300SE Champagne
W126 84 380SEC Signal Red

CraigB
OZBENZ Admin
Posts: 4858
Joined: Thu 23 Jun, 2005 2:18 pm
Model you own: I own multiple different models
Location: Hawthorndene (Adelaide)

Re: Mechanical repairs

Post by CraigB » Thu 29 Mar, 2018 2:41 pm

anyway, maybe get it checked before For King and country out for new struts. The effect i had wasn't bucking bronco but solid thud. There is fluid in the system that is filling or letting go back to reservoir to maintain a certain level in the rear. The nitrogen spheres as i understand it are there to have that give in the system and you go over a bump and the nitrogen compresses and releases. Mine were completely gone so they basically filled up with fluid and nothing to compress is what it felt like. Maybe the bronco thing the diaphragms are still in place but gas gone so compresses air and releases? I imagine a specialist will drive it and diagnose instantly.

And mainly just saying that to put on the record that it can behave differently.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

billiebenz
Dernburg Wagon
Posts: 8
Joined: Wed 28 Mar, 2018 9:06 am
Model you own: w126
Region: New South Wales
Location: Katoomba

Re: Mechanical repairs

Post by billiebenz » Thu 29 Mar, 2018 3:57 pm

happy days!
there are two small screws each side of the wind deflector to give adjustment....love the german way of thinking.
I will take the car in for a spend and get the issues sorted re the suspension and the gearbox.
Will keep everyone up to date with the progress.
While im here...are the 420's kinda sluggish until you get some speed up?
It feels like the car is on song when it hits 120k plus per hour...below this its a bit yawn.
Im wondering if the gearbox is sucking up power.
Cheers
Lewis

User avatar
Ivanerrol
Mercedes Demigod
Posts: 5769
Joined: Sat 12 May, 2007 3:21 pm
Model you own: w204
Location: Melbourne

Re: Mechanical repairs

Post by Ivanerrol » Thu 29 Mar, 2018 10:09 pm

The "apparent" sluggishness is normally due to the transmission. Even though it's a 4 speed, it starts out in second gear - first being quite low.

These are highway cruisers, meant to maintain 160kmh all day long on the autobarns. The engine torque curve comes alive at higher revs.

Compared to the vehicles at the time they were quite rapid.

As I've mentioned previously, The average 4 pot runabout bought at a stealership now will get do the 0 - 100kph quicker than the famed GTHO Falcons of the early seventies.
W211 - E240
W204 - C280
W210 - E240
Departed
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

User avatar
ngruzevs
500 K
Posts: 505
Joined: Fri 30 Oct, 2009 12:53 pm
Model you own: w126
Location: Melbourne
Contact:

Re: Mechanical repairs

Post by ngruzevs » Sun 01 Apr, 2018 10:22 pm

I agree with Ivanerrol, my 420SE always feels sluggish, but comes alive higher in rev range. Guess you just need to drive it as it was intended, remembering they're 25+ years old. To be honest my non-cat 300SE is just as quick (maybe quicker), but feels more sprightly due to shorter gearing.
Current Garage
1971 MK2 Jensen Interceptor Regency Red Jeremy
1979 W116 450SE Brilliant Red Metallic Claudia
1985 W126 280SE Thistle Green Max
1987 W126 300SE (SA Delivered) Pearl Grey Matt Oscar
1990 W126 420SE Dark Blue The Gangster
2013 MK7 Golf GTI White Gerhard

billiebenz
Dernburg Wagon
Posts: 8
Joined: Wed 28 Mar, 2018 9:06 am
Model you own: w126
Region: New South Wales
Location: Katoomba

Re: Mechanical repairs

Post by billiebenz » Tue 03 Apr, 2018 3:13 pm

Thanks for all the feedback chaps.
I have fixed the sunroof and have pulled out the rear seat and backrest and have found that the thread on the strut has stripped which means the washer cannot be clamped onto the rubber....clunk,clunk, over sharp bumps.
Very annoying....does this mean I have to replace both struts or can I re thread the old one? If so wheres a good place to get hydropneumatic struts at a reasonable price?
Also the light for check bulbs has come on and all the lights are working???? its not too bright like a modern car so I could ignore it!
The ASR light comes on occasionally too....does the car ever spin its rear wheels on take off? I would have thought this was impossible with the second gear take off and high RPM torque curve...should the ASR light worry me?
The black box on the side of the fuel distributor is weeping petrol which is annoying and it seems to be a pricy part but from what I can gather its crucial to fuel consumption.Again a good place for parts? I was quoted $450 from silver star spares.
Does anyone have a video link to a how to for replacing this part? Stinks up the cabin.
Also nobody is interested in a full set of immaculate cream sheep skin covers?
Cheers
Lewis

gazman
Gelandewagen
Posts: 106
Joined: Sun 10 Apr, 2016 2:16 pm
Model you own: w126
Location: Nth Dandalup WA

Re: Mechanical repairs

Post by gazman » Tue 03 Apr, 2018 4:11 pm

I could be wrong but is there not 2 O rings that seal said black box to fuel distributor. PM me with a price for the seat covers posted to 6207 cheers
1989 560 SEL King of the road

User avatar
Christo C
Gelandewagen
Posts: 105
Joined: Fri 04 Jul, 2014 9:24 am
Model you own: w124
Location: Sydney [Beaconsfield]
Contact:

Re: Mechanical repairs

Post by Christo C » Tue 03 Apr, 2018 4:46 pm

The “black box” on the side of the fuel distributor is “KE Jetronic Governor (EHA Valve) “and it’s a known problem - they are prone to crack & leak as they age - you could try replacing the O rings first, but cause is more likely hairline cracks in the valve body.
Check for your vehicle - for mine it is Merc Part 000 070 39 62 (Bosch F 026 T03 002)
The cheapest I found, including delivery, was at Bosch Australia webshop; comes as a kit with valve, new bolts and the two special O rings.
Very easy to fit. Not cheap - from memory around $275.
~Christo
1986 230E W124.023 M102.982 ~290,000km Thistle Green Saloon "Janis"

CraigB
OZBENZ Admin
Posts: 4858
Joined: Thu 23 Jun, 2005 2:18 pm
Model you own: I own multiple different models
Location: Hawthorndene (Adelaide)

Re: Mechanical repairs

Post by CraigB » Tue 03 Apr, 2018 5:56 pm

Have a look on ebay for the struts, one of the members on here got some new ones from a place in Sydney i think it was but may have been just one set. They can be very reliable and last a long time so if you got a nice 'dry' set off a wreck, particularly a known car, then you could use used ones.

Can't help with the rest though.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

User avatar
kimrh
300 SLR
Posts: 1500
Joined: Tue 05 Jan, 2010 3:18 pm
Model you own: w126
Location: Perth WA

Re: Mechanical repairs

Post by kimrh » Tue 03 Apr, 2018 7:35 pm

The EHA Valve (black box ) on the side of the fuel distributor is a 5 minute fix to swap out for a new one.
Place rag around underneath it as it will loose a bit of fuel when you undo the two bolts that hold it on.
Unclip the harness plug at the right side of the EHA and then carefully undo and remove the two screws and then remove the EHA
The two existing O-rings will most likely fall out onto your rag but they will be replace with new ones (hence why the rag is needed underneath to catch them and also when placing the new ones into the groove for them on the side of the FD before you re-attache the new EHA.

The EHA has a weep hole in the middle and when they start weeping fuel its time to throw it in the bin (they cannot be fixed as a sealed unit and internal seals are shot) . Usually priced around $300 for a new one - make sure you buy the same part # as the one you are removing.
New one comes with 2 new viton green O-rings

The EHA is a vital part of the Bosch KE-Jet system as it makes adjustments to fuel metering inside the the FD in relation Air-fuel-ratio (AFR) to maximise fuel effiency and performance.
If left to seep fuel they can cause the engine bay to catch on fire
87 White Euro 500SEC "ECE" 195kw
88 Black Euro 560SEC 220kw
89 Midnight Blue Euro 560SEL hydro 220kw AMG Kitted
http://www.flickr.com/photos/krh2013/sets/72157632548663623/
https://www.flickr.com/photos/krh2013/albums/72157668572599252

Post Reply

Return to “W126”