W115 Owner Advice Needed: Buying a 1976 240D - Mercedes-Benz Forum
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post #1 of 43 (permalink) Old 05-05-2019, 01:56 AM Thread Starter
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W115 Owner Advice Needed: Buying a 1976 240D

Greetings!

I own a '84 300D so I'm somewhat familiar with these oldtimers. I'm about to pick up a '76 240d 4 speed manual here in the UK. Claimed 86K miles which can be verified going back 15 years only. Wanted to know if I need to specifically look for trouble areas during my pre-purchase inspection?

The car looks 98+% rust free (aside from some paint bubbling on the trunk and hood) and the interior looks like it would support that mileage (ignore the floor mat). The under section has been waxoyl'd.

A couple issues spotted:

1) Water leak gathering near the floor panel. Presumed to the be the sunroof
2) Gear knob wobbles quite a bit. Bushing perhaps?
3) Door, sunroof and window seals are hardened/ cracked. Are replacements available?

All experienced owner guidance/ illustrated buyers guides welcome!
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post #2 of 43 (permalink) Old 05-10-2019, 12:09 AM
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Rust , rust , rust .

These lovely cars have a thick layer of sound proofing on the floor and a thick layer of proofing under the floor .

This has usually cracked and let the weather in . The floor rusts away , nicely hidden , the rust creeps under the seat mounts , up the inside of the sills , eats away at the seat belt mounts , all hidden under the sealer and carpets .

Then there is the firewall rust ............

Heater fan is a weeks mission to pull and restore , if you can find the replacement fan ............. currently made of unobtainium .

It looks LOVELY , go for it .

edit; I had a 240D manual , it was great , the door + screen seals were easy sourced . Engine and subframe mounts also .

Sold it eventually after spending several years chasing the rust . have a w115 300D now .

It has heater fan issues too

Last edited by Foxglove; 05-10-2019 at 02:38 AM.
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post #3 of 43 (permalink) Old 05-11-2019, 01:02 AM Thread Starter
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Originally Posted by Foxglove View Post
Heater fan is a weeks mission to pull and restore , if you can find the replacement fan ............. currently made of unobtainium .

I had a 240D manual , it was great , the door + screen seals were easy sourced . Engine and subframe mounts also .
From what I can tell, rust and the heater fan are the two main issues with W115's. Fortunately, neither seems to be a deal breaker on the W115 240D I am looking at. Heater fan has never been replaced (atleast in the last 2 decades) and works without issue. Are they not available anywhere? Even aftermarket?


There's very minor surface rust underneath the car that I plan to have addressed immediately but the car lived most of its life on the Isle of Wight - no snow and warmer climates have benefitted it would appear.

Going to go pick up the car today. Will look at the areas you mentioned.
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post #4 of 43 (permalink) Old 05-11-2019, 03:44 AM
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Heater blower is a major pain the bottom. If it's not working and you need it, and I'm expecting you would based on your location, you're looking at a good 10-12 hour remove and replace. I'm not sure you an even get the part any more.

I've done the job, and it's very unpleasant.

Good luck!

Dan
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post #5 of 43 (permalink) Old 05-12-2019, 02:54 AM Thread Starter
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Purchased the car today and drove 175 miles from the Cotswolds back to London. The car drove in the most delightful way imaginable - very peppy and fun in the corners (I was expecting a slow barge!). The steering wheel and interior wasn't worn or damaged, the seats were firm and the car's responsiveness, all lead me to believe that the claimed 76K mileage was true.

I did notice several small issues which I will post later but found nearly no rust under the car. I did find noticeable engine blowby (demonstrated by the dancing oil cap) but the car started instantly when cold, emitted no black or white smoke and drove like a new car (no exaggeration here). The previous owner did share that the car wasn’t used for nine years, which may be the cause:


Going to run Auto-Rx engine oil treatment (worked wonders in my '84 300D) and do a diesel purge to try and cleanse the internals next.

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post #6 of 43 (permalink) Old 05-13-2019, 09:37 AM Thread Starter
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List of issues found so far:

1) Brakes pulsing under pressure. (Could be uneven/ warped rotors or the front calipers. Rear calipers were just changed)

2) Car pulling slightly to the left.

3) Both Front Doors locks not locking & central locking not operational

4) Engine blow by (filmed above)

5) Injection pump oil change (Lubro Moly MOS2 10W40) + Diesel Purge + 3 fuel filters

6) Power steering filter(s) and fluid change - (Febi Bilstein -
https://www.amazon.co.uk/gp/product/...KL5A1OLE&psc=1)

7) Manual Transmission Oil change - (Lubro Moly Synthetic fluid- https://www.amazon.co.uk/gp/product/...KL5A1OLE&psc=1)

8) All window, sunroof and screen seals need replacing

9) Front windscreen chip needs a repair

10) Gear lever bushings as the lever is very wobbly and imprecise.

11) Check subframe, engine, transmission mounts and driveshaft couplers

12) Lubricate speedometer cable

13) Minor rust repair on left hand side corner underneath rear windscreen.

14) Roof lining needs a thorough cleaning with minor repair

15) Factory power moonroof jammed but doesn't look rusted. Owner swore it worked a few months ago but I can't hear the motor engage.

16) Series to pencil glowplug upgrade

17) Turn indicator bulb isn't working and the stalk doesn't stay in position (Replacement likely required)


That's all I can find so far!
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post #7 of 43 (permalink) Old 05-18-2019, 12:25 PM Thread Starter
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Picture of the car with the kind couple who helped me find it! Two mechanics have given it a clean bill of health with no rust anywhere.

Doesn't consume any oil with not a drop on the floor where its kept. A true joy to drive!
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post #8 of 43 (permalink) Old 05-18-2019, 12:57 PM
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Excellent , the car looks lovely .

Just the normal stuff to do on the car after a long sleep.

Trans normally has ATF , the 75-90 is not factory recommended .

Yes the blow by is large , but a diesel purge in the fuel and sump might clear a stuck ring or two . Or the bore is just glazed and you will have to live with it.

Drive it like you stole it
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post #9 of 43 (permalink) Old 05-18-2019, 01:01 PM Thread Starter
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Originally Posted by Foxglove View Post

Trans normally has ATF , the 75-90 is not factory recommended .
Manual transmissions have ATF in them? This oil is recommended by Begsma. I've learned to trust his tribal knowledge (while not purchasing everything he tries to sell you)

https://mercedessource.com/store/lub...smission-fluid

Cheers!

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post #10 of 43 (permalink) Old 05-18-2019, 01:13 PM
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Yes , manual trans has ATF .

Kent is an enthusiast , not a Mercedes trained tech.

edit , quick google search finds ;

https://bevo.mercedes-benz.com/bevolisten/236.1_en.html

Last edited by Foxglove; 05-18-2019 at 01:18 PM.
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