M110 intake manifold R1101412401: Buying guide W123 280E & R107 280SL
Anyone restoring a W123 280 E or an R107 280 SL will sooner or later take the intake side of the M110 apart: renew the gasket, free up the linkage, eliminate vacuum leaks. It often turns out that the old intake manifold has corroded, been tampered with or suffered thread damage after decades. Then the question arises which spare part fits, because the M110 has several casting numbers as well as carburetor and fuel-injection variants. This guide shows how to recognize damage and what to look out for when buying.
How do you recognize wear or damage?
The intake manifold distributes the filtered intake air evenly to the six cylinders of the inline-six. The throttle body regulates the amount of air via the accelerator pedal and thus the power. The casting itself has no wear parts in the strict sense – damage arises from age, corrosion and installation.
| Finding | Meaning |
|---|---|
| Crack at the flange or at a mounting lug | Replace the intake manifold – a crack at the sealing flange cannot be repaired reliably in the long term |
| Deep corrosion pits or pitting on the cylinder head flange surface | The new gasket can no longer seal properly; vacuum leaks are the result |
| Stripped or overtightened threads | Depending on location, repairable with a thread insert, otherwise replace |
| Stiff or worn linkage, missing rubber buffers | Throttle response becomes imprecise; check linkage and bearings, replace the complete unit if necessary |
| Idle fluctuates, engine responds poorly when cold | Not automatically the intake manifold – often control pressure or the warm-up regulator of the K-Jetronic, see Check warm-up regulator W123 280E (M110) |
| Idle hunts when the engine is warm | Often a vacuum leak at hoses or an idle problem – see Idle control valve defective: idle fluctuates |
Causes
After four decades, three things mainly affect cast aluminum. First, moisture and road salt: they attack the aluminum, especially at sealing surfaces that lay under an old gasket for decades. Second, installation: seized bolts that are removed by force and uneven tightening can damage mounting lugs and threads. Third, the linkage: bearing points and rubber buffers age, and the throttle valve then no longer responds precisely to the accelerator pedal. In addition there are partial engines that were stored open for a long time – dirt and water in the passages are not uncommon there.
What to look for when buying
- Compare the casting number: The number R 110 141 24 01 is cast into the part and is not a Mercedes order number. Compare it with the casting number on your own intake manifold. Please do not swap in other M110 casting numbers, for example with the end numbers 12 01 or 37 01, without checking.
- Determine fuel injection or carburetor: This intake manifold has a separate throttle body and is intended for the fuel-injected M110. The carburetor variants (280, 280 C, 280 S) have a carburetor flange – it does not fit there.
- Identify the engine reliably: The V8 engines M116 and M117 as well as M103 and M104 (W124, W201) are different engines. If in doubt, the VIN helps.
- Inspect the condition of the flange surface: Flat, without deep corrosion and without cracks. On our unit, greenish remnants of the old gasket still cling to the cylinder head flange surface and must be removed before installation. No breaks are visible.
- Check the scope of delivery: Throttle body, linkage, bellcrank and rubber buffers should be present, otherwise you will have to transfer parts from the old unit. Plan on a new intake manifold gasket right away.
Solution
If the existing intake manifold is damaged or incomplete, a refurbished genuine part is the economical solution. Our intake manifold with casting number R 110 141 24 01 (1101412401) has been cleaned and re-coated in silver, and is supplied complete with throttle body, linkage, bellcrank and three rubber buffers. The price is 189 €, and we give a 5-year warranty on the refurbished part. It is a one-off piece. Before installation, carefully remove gasket residue on the flange surface and the cylinder head, use a new gasket and tighten the fasteners evenly.
Intake manifold M110 fuel-injected – casting number R 110 141 24 01
W123 280 E/CE/TE · R107 280 SL · C107 280 SLC · refurbished, with throttle body · 189 €
View intake manifoldThe intake manifold is a one-off piece. You will find more parts for your car in our categories W123, W107 / R107 and Fuel system & injection. If you are overhauling the M110 anyway, you will find in the guide M110 crankshaft: buying guide more tips.
Compatible vehicles
| Model series | Model / engine |
|---|---|
| W123 (sedan, coupe, estate) | 280 E, 280 CE, 280 TE – M110 2.8-liter fuel-injected |
| R107 (SL) | 280 SL – M110 2.8-liter fuel-injected |
| C107 (SLC) | 280 SLC – M110 2.8-liter fuel-injected |
Assignment according to dealer data for casting number R 110 141 24 01. Please compare the casting number on your own intake manifold; if you have questions, we check against your VIN free of charge.
FAQ
Is R 110 141 24 01 the Mercedes order number?
No. R 110 141 24 01 is the casting number cast into the part. It is used to identify the version. Compare this number with the casting number on your own intake manifold.
Is the throttle body included with the intake manifold?
Yes. The intake manifold is supplied complete with throttle body, linkage, bellcrank and three rubber buffers.
Does the intake manifold also fit a 280 or 280 S with carburetor?
No. The carburetor variants of the M110 have a carburetor flange instead of a throttle body. This intake manifold is intended for the fuel-injected M110.
Does the intake manifold fit a W124 or W201?
No. The W124 and W201 have the engines M103 and M104 or other engines, not the M110. This intake manifold is also not suitable for the V8 engines M116 and M117.
What does the refurbished M110 intake manifold cost at KFZTeile-Thot?
The refurbished intake manifold R1101412401 with throttle body costs 189 €. It is a one-off piece with a 5-year warranty on the refurbished part.
KFZTeile-Thot is a specialist dealer for tested and refurbished Mercedes parts with its own test benches and has over 1,000 positive eBay reviews. Not sure whether the intake manifold fits your M110? Call us at +49 179 8991069 (Mon–Fri 8 am–6 pm) or write to us via the contact form – ideally with your VIN or a photo of the casting number.