123 engine in a W116

1973-1980 : 280S, 280SE, 280SEL, 300SD, 350SE, 350SEL, 450SE, 450SEL, 450SEL 6.9
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Scotty H
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Model you own: w116

123 engine in a W116

Post by Scotty H » Fri 28 Aug, 2015 3:33 pm

Hello All

A car local to me is a W123 84 model 280E with an allegedly refurbished motor. . Are the engines exactly the same or is the W123 block/mounting points different? Will it fit straight in? Is the injection system the same also?

Regards

Scotty

CraigB
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Re: 123 engine in a W116

Post by CraigB » Fri 28 Aug, 2015 10:30 pm

You didn't say what year the 116 is. I am pretty sure motor is the same but injection can be different depending on year. If it looks the same then it will be. But I imagine you could interchange and use whatever injection is on yours. Compression ratio is possibly lower in the later engine but depends how important the performance is to you. I'm not an expert and others may respond.
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MercMad West Australian
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Re: 123 engine in a W116

Post by MercMad West Australian » Sat 29 Aug, 2015 10:00 am

upto some time in 1976 D(isaster)-Jet is used in the w116, you will spot the difference instantly, the intake manifold is different and electronic fuel injectors are used. After then K-Jet was used and thats what will be on the w123 engine.

If its a K-jet w116 the change over will be quite simple indeed - though, i know on the W126 280SE the transmission was the more modern 1 piece housing version, not sure on the W123, compared to the W116 that might be an issue.
MMWA

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John Green
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Re: 123 engine in a W116

Post by John Green » Sat 29 Aug, 2015 10:31 am

The engine and its mounting are the same, but the inlet and exhaust manifolds are very differant. You can use the W123 inlet manifolds, but will also need the W123 air filter as the W116 unit will no longer fit. You would have to change over the exhaust manifolds or get the engine pipes modified to suit.
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Scotty H
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Model you own: w116

Re: 123 engine in a W116

Post by Scotty H » Sat 29 Aug, 2015 2:25 pm

Hi All

Thank you for all replies. Mine is a 78 280 SEL so all should be well

Regards

Scotty

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Greg in Oz
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Re: 123 engine in a W116

Post by Greg in Oz » Sat 29 Aug, 2015 10:26 pm

MercMad West Australian wrote:upto some time in 1976 D(isaster)-Jet is used...
That's a bit unfair. I had 29 years of almost trouble-free operation of the D-Jet in my old 350SLC. I wish I could say the same for some of our KE-Jet cars although so far the K-Jet in my 500SLC has been reliable (touch wood).
107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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MercMad West Australian
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Re: 123 engine in a W116

Post by MercMad West Australian » Sun 30 Aug, 2015 1:28 pm

Greg in Oz wrote:
MercMad West Australian wrote:upto some time in 1976 D(isaster)-Jet is used...
That's a bit unfair. I had 29 years of almost trouble-free operation of the D-Jet in my old 350SLC. I wish I could say the same for some of our KE-Jet cars although so far the K-Jet in my 500SLC has been reliable (touch wood).
KE can be a bit fiddly and is by no stretch of the imagination as reliable as K-jet but so far I've had no issues working with the final revision of it used on MB's - KE-5.

D-jet on the other hand has no shortage of complaints by people never getting it to work properly ever again once a malfunction occurs.
MMWA

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tony66au
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Re: 123 engine in a W116

Post by tony66au » Sun 30 Aug, 2015 6:51 pm

Its not that hard mate, Check the values on the MPS, fix Vac leaks, refurb AAV, Refurb/check fuel lines (Injectors, Cold start Injector), check TPS, check for mix fiddle on ECU, clean and check Inj pulse pickups and Voila Dirty D jet bliss.

Failing that find a good old school Benz guy or an old school Jag guy with V12 chops and bring your wallet.

If you do another Christmas run next year Pop into the new place and have a play, I have a few scrap body D jets here that need sorting and you are welcome to have a play.
Silver Green 73 350SLC (Slow Mech resto)
Aqua Blue 73 350SE (Parts)
Papyrus white 74 280S El Fred (On the slab)
Silver Green 74 450SEL (Parts)
Topaz brown 77 450SE (On the slab)
Signal Red 79 280E (Sons car)
230TE W124 (Scrapped)
Dirty D jet connoisseur

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