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1988 300SEL W126
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595 Posts
Discussion Starter #1 (Edited)
I bought this car yesterday, 34K on the clock, the last time the started they engine was is 1995, the fuel tank,sender, hoses are rusted and sticky, found a good deal on them already from Germany, the fuel distributor's plunger is stuck, the interior needs detailing and cleaning ... etc, the seats are saggy,brakes are working , the leather in a good shape, the previous owner's son bought new Toyo tires,battery new registration sticker and lic. plate he thought its easy fix, he towed the car to the dealer ship and they tried to rip him off, then he decided to sell. the engine is not stuck, starter is working. what else i need to do to make it running, till now i need the below:

Belts, fuel tank, fuel sender, fuel filter, fuel pump, fuel hoses, flush the fluids.

what else? chain and rails ? camp shift oiler kit ?
 

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1988 300SEL W126
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595 Posts
Discussion Starter #3
Awesome. Such low mileage. Worth the effort probably.
Thanks, so what shall i pay attention to at the beginning, beside the things i stated above ? do i need to drop the oil pan ? change the chain or something like that ? its my first time dealing with abandoned car.
 

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1991 560sec. 1969 280SL
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1,025 Posts
Change antifreeze, brake fluid, trans fluid, diff oil. Replace engine oil and filter. Disconnect and blow out the fuel lines, drain and flush the gas tank, replace gas filter and air filter. If needed replace the cap, rotor, wires and coil. Replace points and condenser if so equipped. After you’ve made sure the engine is running ok I would drain about two quarts of oil from the engine and add two quarts of trans fluid and run the engine at a fast idle for twenty minutes or so and drain and refill the oil again. Replace all the fuses with ceramic copper ones and clean all the fuse contacts and while your at it, check and if necessary replace all bulbs and clean contacts. I think that takes care of it, but someone will find something to add to that list anyway.
 

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1991 500SEC sub 50K mi. 1987 560SEC Now 150K mi. 2018
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4,191 Posts
Nice catch! Best of luck with it...

In addition to others' great advice & suggestions, I'd replace the timing chain tensioner with a replacement from MB, as the early ones were prone to leak down. The later, upgraded design does not.

M
 

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1988 300SEL W126
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595 Posts
Discussion Starter #9
Change antifreeze, brake fluid, trans fluid, diff oil. Replace engine oil and filter. Disconnect and blow out the fuel lines, drain and flush the gas tank, replace gas filter and air filter. If needed replace the cap, rotor, wires and coil. Replace points and condenser if so equipped. After you’ve made sure the engine is running ok I would drain about two quarts of oil from the engine and add two quarts of trans fluid and run the engine at a fast idle for twenty minutes or so and drain and refill the oil again. Replace all the fuses with ceramic copper ones and clean all the fuse contacts and while your at it, check and if necessary replace all bulbs and clean contacts. I think that takes care of it, but someone will find something to add to that list anyway.
The gas tank is full of rust and junk, the fuel sender is cracked in 2 pieces, fuel pump is sticky from inside, already ordered all of them from Germany, what do you mean by "Replace points and condenser if so equipped" what is that
 

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1988 300SEL W126
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595 Posts
Discussion Starter #10 (Edited)
Nice catch! Best of luck with it...

In addition to others' great advice & suggestions, I'd replace the timing chain tensioner with a replacement from MB, as the early ones were prone to leak down. The later, upgraded design does not.

M
do you recommend changing the chain and the guide rails ? do you think they are bad ? is there away y to tell from the way they look ?
 

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Outstanding Contributor
450slc5.0cab 280sl5sp 280se4.5 500seAMG +250seStkW108 350sl4spdX3 500secEuro
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I find it very interesting that your late 70’s 450sl also has polished bundt wheels like my 1979 450sl. I took mine off and see that they are aftermarket 6x14 wheels, not original MB 6.5x14. I wonder how common the practice was to replace the stock wheels with polished aftermarket ones. Or if you have stock polished wheels.


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1988 300SEL W126
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595 Posts
Discussion Starter #12
I find it very interesting that your late 70’s 450sl also has polished bundt wheels like my 1979 450sl. I took mine off and see that they are aftermarket 6x14 wheels, not original MB 6.5x14. I wonder how common the practice was to replace the stock wheels with polished aftermarket ones. Or if you have stock polished wheels.


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i checked the wheels, they are from MB, the spare also is matching the 4 other wheels, may be the previous owner asked for those wheels
 

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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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The gas tank is full of rust and junk, the fuel sender is cracked in 2 pieces, fuel pump is sticky from inside, already ordered all of them from Germany, what do you mean by "Replace points and condenser if so equipped" what is that
A car that old has a thing called a "distributor" which "distributes" the electricity to each spark plug in turn. It has a rotor that wipes past contacts in the "distributor cap". The points and condenser will be found inside that. The points close to feed the electricity to create the sparks, the condenser stops sparks occurring on the points themselves. Personally I would send the entire distributor off to a specialist for overhaul - you're unlikely to find a new one anywhere these days, it's quite a complex old mechanical device and without the distributor working properly you'll have no end of ignition problems later.

To find the distributor follow all the spark plug leads back from the spark plugs to where they plug into a single plastic cap - that's the distributor cap and the distributor is beneath it.

Next week: how to feed hay to your horse :)
2610200
 

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1988 300SEL W126
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595 Posts
Discussion Starter #14
Thanks man !! i thought u are talking about something else 😂 ,sorry my bad. the same for my other car with M103 engine 300SEL



A car that old has a thing called a "distributor" which "distributes" the electricity to each spark plug in turn. It has a rotor that wipes past contacts in the "distributor cap". The points and condenser will be found inside that. The points close to feed the electricity to create the sparks, the condenser stops sparks occurring on the points themselves. Personally I would send the entire distributor off to a specialist for overhaul - you're unlikely to find a new one anywhere these days, it's quite a complex old mechanical device and without the distributor working properly you'll have no end of ignition problems later.

To find the distributor follow all the spark plug leads back from the spark plugs to where they plug into a single plastic cap - that's the distributor cap and the distributor is beneath it.

Next week: how to feed hay to your horse :) View attachment 2610200
 

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1988 300SEL W126
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595 Posts
Discussion Starter #15
SHE IS BACK TO LIFE!!!!

New fuel tank, fuel pump and filter, all fuel lines (rear and front), fuel sender, fuel accumulator, rebuilt the fuel distributor due to stacked plunger, new spark plugs, new valve cover seals, all fuel lines where clogged with tar due to old fuel since 1999. appreciate this thread without the valuable information in here this project will cost a tone for money.after a lot of backfires and misfiring I finally started the engine yesterday.

youtu.be/2Vd1KNf4PO4

youtu.be/mKkxawnVGaE
 

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1986/1990 W126
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Amazing. That must've cost a mint and I'd have been so excited to get all those lovely MB packages.
 

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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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Don't want to rain on your parade but that photo through the oil filler cap seems to show bad pitting in that camshaft lobe. Do the cams look okay?
 

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450slc5.0cab 280sl5sp 280se4.5 500seAMG +250seStkW108 350sl4spdX3 500secEuro
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Don't want to rain on your parade but that photo through the oil filler cap seems to show bad pitting in that camshaft lobe. Do the cams look okay?
WTH are you talking about? Do you need glasses? Or do I?




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1988 300SEL W126
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Discussion Starter #20
Looks fine when i opened the covers to replace the oilers, they where fine and very tight


Don't want to rain on your parade but that photo through the oil filler cap seems to show bad pitting in that camshaft lobe. Do the cams look okay?
 

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