Exhaust manifold for Mercruiser MCM 140 to 1982 MD96705A1

• Exhaust manifold for Mercruiser MCM 140 to 1982 MD96705A1

Exhaust manifold for Mercruiser MCM 140 up to 1982 MD96705A1 is the water-cooled cast iron exhaust manifold for early Mercruiser MCM 140 applications with GM 181 four-cylinder engines.

It collects the exhaust gases at the cylinder head and passes them on to the downstream exhaust gas elbow in the wet exhaust system.

Suitable for the following models:

• MerCruiser MCM 140 with GM 181 CID 3.0L from 1968 to 1982
• MerCruiser 140 GM 181 I/L4 from serial number 2508261 to 6229717

Technical information:

• water-cooled exhaust manifold made of cast iron
• for the early MCM 140 series up to 1982
• for 4-cylinder wet exhaust systems

Replaces the following reference numbers:

• MerCruiser 96705A1
• MerCruiser 52390A1
• Sierra 18-1955-1
• Barr MC-1-96705
• OSCO 6705

FAQ for this article:

For which 140 engines is this headers intended?
It is intended for the early MerCruiser MC-140 platform with GM-181 four-cylinder engines up to 1982.

Why is the serial number important?
MerCruiser used different header designs for the 4-cylinder exhaust systems. A reliable selection is therefore based on the engine series and serial number range.

When should the manifold be replaced?
Replacement is necessary in the event of rust pitting, wall corrosion, water leaks or internal corrosion.