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1990 merc 560 sec, 1984 merc 500 sec ,1983 Mercedes 380 SEC ; 2007 Discovery III
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450 Posts
Discussion Starter #1 (Edited)
Good day ALL,

I am making steady progress with my Mercedes SEC engine swap. I am removing the 380 engine from the Sec and replacing it with a 500 SEL engine. Both are gen1. See attached the pic of the 500 gen 1 engine almost fully assembled. Now ready for installing into engine bay and finalising assembly thereafter.
I have a question regarding the fuel distributor and the warm up regulator.
The 500 fuel distributor (FD) has an electrical connection on either side, see pics. What is this electrical connection for and what does it do. On the 380 the FD has no electrical connections.
Question 1. Do I just ignore these electrical connections and drive the vehicle?, what problems can I expect if I do this; or will I lose engine performance and efficiency?
Question 2. If connection of the two electrical connections described above are necessary for a smooth and efficient running engine, then how do I incorporate these connections to my current 380 wiring loom?
Question 3. I have both the 500 and 380 FD, also have all the sensors. Should I install the 380 FD into the 500 engine, or should I keep the 500 standard and ignore the electrical connections.
Also note; in one of the pics there is no warm up regulator on the 500 engine. Is this why there is the electrical connection on the FD. So I am thinking that the 500 engines do not have the warm up regulator?

Question 4: does the Gen1 fuel distributor have these electrical connections ? or perhaps this engine/FD is some sort of hybrid between gen 2 and gen 1?

I will be installing the engine this coming week, and will appreciate all you input.

Regards
c
 

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1989 500SEC
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253 Posts
those connections on the 500 engine are for the throttle position switch (on the right) and the electro-hydraulic actuator (on the right) which would indicate that the 500 engine is KE-Jetronic not K-Jetronic like your 380 engine. Its possible you could just ignore the TPS and EHA and plumb in the warm up regulator
 

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1990 merc 560 sec, 1984 merc 500 sec ,1983 Mercedes 380 SEC ; 2007 Discovery III
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450 Posts
Discussion Starter #4
Thanks,

any suggestions on how to proceed ?

what is the main difference between the K and KE injection system.

thanks

C
 

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Outstanding Contributor
600 (3.200 mm)
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1,542 Posts
Thanks,

any suggestions on how to proceed ?

what is the main difference between the K and KE injection system.

thanks

C

There are many differences between KA- and KE-Jetronic.
If you want to install that 5.0 engine into your car, it need all electrical components of the KE system.
But better way (in case replacements KA with KE) is replacing 3.8 with 5.0 (10:1 comp. ratio) or 5.6 (10:1 c.r.).

IMHO
 

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560 SEC
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100 Posts
I'm breaking a GenII 560 10:1 if you need any parts, everything available including wiring loom & 10:1 CR pistons etc..
 

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1990 merc 560 sec, 1984 merc 500 sec ,1983 Mercedes 380 SEC ; 2007 Discovery III
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450 Posts
Discussion Starter #8 (Edited)
hi engine number is : 11796312014388

it is a gen1 engine.

everyone here say it is such a simple swap

your suggestions will be most welcome

thanks
c
 

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2004 SL500, 1993 S420, 1990 420 SEL, 1985 500SE, 1994 Toyota Supra Aerotop
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753 Posts
If that's true, then only the fuel system is from the second series, so just replace it with the system from the 380 and you'll be fine. Swap over the complete fuel assembly including air metering box, fuel distributor, warm up regulator and check wether the injectors in the 500 engine are for the series 1 or 2, since they are a different part as well. You can reference the part numbers on parts.com or germanstar.net

I'd recommend getting the jetronic system checked over at this point so you won't have any hassles.
 
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