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1984 500 SEC
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Discussion Starter #1
My 1984 EURO 500 SEC had its engine replaced by the previous owner.

I've only just spotted that the current engine is a 117.960 and not a 117.963 as detailed by the VIN number.

I can't find any info online about the differences between these 2 models and wonder if there might be any issues I should be aware of, like incompatible parts. All replacement parts so far have been sourced using the VIN number which assumes that I have the 117.963.

Any info that people can share would be very helpful.

Thanks as always
 

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Outstanding Contributor
450slc5.0cab 280sl5sp 280se4.5 500seAMG +250seStkW108 350sl4spdX3 500secEuro
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It makes a difference in where it falls in the 117.960 series. What engine number do you have?

Does it have a full serial number? Or might it be a generic replacement block? I would assume if it doesn’t have a full engine number there isn’t much of a difference from the 117.963. The 117.960 has an idle screw and Aux Air Valve instead of an electronic idle air valve. What do you have?


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450slc5.0cab 280sl5sp 280se4.5 500seAMG +250seStkW108 350sl4spdX3 500secEuro
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Thanks for the reply Fonzi

The full serial number is: 11796012003678

450SLC 5.0/early 500SL motor
Correction:
That’s the 500slc / early 500sl (and maybe g-wagon) version that has an idle screw and AAV, and only came with tri-y exhaust as I understand it. Unfortunately the w126 and r107 tri-y exhaust aren’t the same and I figure your car is unlikely to have tri-y. :(

Do you have Tri-y exhaust manifolds?

And FYI to Bondavi, this iron block style flange is specific to the 450slc 5.0 motors which, you can see stopped at about the same engine number as the number of 450slc 5.0 produced. The four speed trans of the 500slc has a different connection to the engine than all the iron block and 450slc 5.0 that all used the 3-speed automatic (but there were 3.5 4-speed automatics, very common on early 350sl).



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450slc5.0cab 280sl5sp 280se4.5 500seAMG +250seStkW108 350sl4spdX3 500secEuro
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Thanks for the reply Fonzi

The full serial number is: 11796012003678
So... to clarify... the motor most likely came from a 500sl or 500slc and possibly a g-wagon or was a replacement engine with a full serial number. The main differences in the engine from the 117.963 is the bolt-on parts on the intake manifold, and the exhaust manifolds themselves. Both could have been swapped out with the original motor, perhaps the entire intake manifold and maybe even heads too.

I think the 117.960 is probably a more desired and less common motor than the 117.963. So I don’t think there’s any reason to be upset. There’d be more reason to be upset if you had a 963 and expected a 960 in my opinion.


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1984 500 SEC
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Discussion Starter #7
Thanks again for following up.

I definitely don't have tri-y's - sadly. But I'm pleased to hear that the engine is just as good as 963 which I was a little worried about. Regarding the idle valve, this is a bit above my pay grade but I do have the electronic idle control unit which I had to replace recently. Not sure if that is relevant or not. Can I therefore assume I don't have to worry too much about other components being interchangeable between the 963 and the 960?
 
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