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The Mercedes Benz 2.8 Liter M110 Engine, Produced: 1972 to 1986

Download: Mercedes M110 Engine Service Repair Manual

Mercedes M110 Engine Service Manual
Download: 92.7mb, 787 pages, .pdf
Applications: W107, W114, W116, W123, W126, W460
Bosch Fuel Injection Manuals Available Separately

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The M110 engine family is a (double overhead cam) DOHC designed engine with 2 valves per cylinder and a straight inline 6 cylinder automobile engine configuration that was made by Mercedes-Benz in the 1970’s and 1980’s. Cylinder valves included 1 intake, and 1 exhaust per cylinder with V-shaped overhead configuration. Valve operation was performed by 2 top camshafts and the camshaft drive was a duplex roller-type chain.

The M110.92x and .93x engines are carburetor engines, with Solex 4A1 carburetor. The M110.98x and .99x engines are fuel-injected engines, with Bosch D-Jetronic up to the .983 and K-Jetronic from the .984 on.

The M110 .92x and .93x carburetor engines were replaced by the SOHC 2.6L M103 while .98x and .99x fuel-injected engines were replaced by 3.0L M103 starting in 1986.

All M110 engines have a displacement of 2.8 L (2746 cc) (170.8 cu in) and an 86 mm bore and 78.8 mm stroke. Firing order is 1-5-3-6-2-4.

Amount of coolant in the radiator was 11 liters from 1972 and 12 liters from 1980’s and on. The lubrication system was a pressure circulation lubrication system that contained 6 liters of oil (lubricant).

Application Survey of Mercedes Benz M110 Engines

M110.921 / M110.931
The .931 is the low-compression version of the .921.
Power output of .921: 160 hp (118 kW) at 5500rpm.
Power output of .931: 145 hp (107 kW) at 5500rpm.

Applications:
1972-1976 280 (W114)
1972-1976 280C (W114)

M110.922 / M110.932
The .932 is the low-compression version of the .922.
Power output of .922: 160 hp (118 kW) at 5500rpm.
Power output of .932: 145 hp (107 kW) at 5500rpm.

Applications:
1972-1980 280S (W116)

M110.923
Power output: 156 hp (115 kW) at 5500rpm, or 143 hp (105 kW) at 5500rpm for the low-compression version.

Applications:
1975-1981 280 (W123)
1975-1981 280C (W123)

M110.924
Power output: 156 hp (115 kW) at 5500rpm, or 143 hp (105 kW) at 5500rpm for the low-compression version.

Applications:
1979-1985 280S (W126)

M110.926
Power output: 156 hp (115 kW) at 5500rpm, or 143 hp (105 kW) at 5500rpm for the low-compression version.

Applications:
1979-1985 280S (W126)

M110.981 / M110.991
The M110.981 uses Bosch D-Jetronic injection. This system senses the ambient temperature, engine temperature, intake manifold underpressure and throttle valve position and calculates with an analog computer how many milliseconds the fuel injectors should stay open per revolution.
The .991 is the low-compression version of the .981.
Power output of .981: 185 hp (136 kW) at 6000rpm and 176 ft. lb of torque at 4500rpm.
Power output of .991: 170 hp (125 kW) at 6000rpm.

Applications:
1972-1976 280E (W114)
1972-1976 280CE (W114)

M110.982 / M110.992
The .992 is the low-compression version of the .982.
Power output of .982: 185 hp (136 kW) at 6000rpm.
Power output of .992: 170 hp (125 kW) at 6000rpm.

Applications:
1973-1976 280SL (R107)
1973-1976 280SLC (C107)

M110.983 / M110.993
The .993 is the low-compression version of the .983.
Power output of .983: 185 hp (136 kW) at 6000rpm.
Power output of .993: 170 hp (125 kW) at 6000rpm.

Applications:
1972-1975 280SE (W116)
1972-1975 280SEL (W116)

M110.984
The M110.984 was the first engine with the new Bosch K-Jetronic injection. This system is mechanical. The air that is taken in is weighed to the determine the amount of fuel to inject.
Power output: 177 hp (130 kW) at 6000rpm up to April 1978; 185 hp (136 kW) at 5800rpm from April 1978.

Applications:
1975-1981 280E (W123)
1975-1981 280CE (W123)
1975-1981 280TE (W123)

Auto Service Manual Download

M110.985
Power output: 177 hp (132 kW) at 6000rpm up to April 1978; 185 hp (136 kW) at 5800rpm from April 1978.

Applications:
1976-1980 280SE (W116)
1976-1980 280SEL (W116)

M110.986
Power output: 177 hp (132 kW) at 6000rpm up to April 1978; 185 hp (136 kW) at 5800rpm from April 1978.

Applications:
1976-1985 280SL (R107)
1976-1985 280SLC (C107)

M110.987
Power output: 185 hp (136 kW) at 5800rpm. Maximum torque: 240 Nm at 4500rpm. Compression ratio: 9.0:1

Applications:
1979-1985 280SE (W126)
1979-1985 280SEL (W126)

M110.988
Maximum output was 185 hp (136 kW) at 5800rpm
Maximum torque was 240 Nm at 4500rpm
The compression ratio was 9.0 : 1.

Applications:
1978-1986 280E (W123)
1978-1986 280TE (W123)
1978-1986 280CE (W123)

M110.989
Power output: 185 hp (136 kW) at 5800rpm.
Maximum torque: 240 Nm at 4500rpm.
The compression ratio: 9.0 : 1.

Mercedes W126 Service Manual Download Link

Applications:
1981.10-1985 280SE (W126)
1981.10-1985 280SEL (W126)

M110.990
Power output: 185 hp (136 kW) at 5800rpm.

Applications:
1976-1985 280SL (R107)
1976-1985 280SLC (C107)

Mercedes Benz Service Manual Download

M110.994
This engine was specifically produced for the G-Class Geländewagen. It has a low compression ratio. It uses K-Jetronic.
Power output: 156 hp (115 kW) at 5250rpm up to 1984; 150 hp (110 kW) at 5250rpm from 1984. Torque: 226 Nm at 4250rpm.

Mercedes W126 Service Manual Download Honda

Applications:
1979-1989 280GE (W460)