Cylinder head and liner Manufacturer & Supplier – EMD 645 & 710 Parts

Overview

EMD 645 and 710 engines are 45-degree V, two-stroke, uniflow-scavenged diesels: intake air enters through ports in the cylinder liner wall, and exhaust leaves through four poppet valves in the cylinder head. The liner is a wet liner — its outer surface sits in direct contact with coolant — while the head carries the exhaust valves and injector.

How It Works in the Engine

Coolant flows through individual metal jumpers into each liner before reaching the head, carrying combustion heat away and keeping the liner's running surface stable for the piston rings. Because wear on a liner or a head shows up as a compression or cooling problem rather than an obvious break, EMD engines are built so the head, liner, piston, piston carrier, and piston rod come out and go back in together as one power assembly — which is also how we ship these.

Signs You Need a Replacement

• Liner-wall pitting or cavitation erosion on the coolant side
• Exhaust valve seat recession or a head that won't hold compression
• Cracking around injector or valve bores from repeated thermal cycling
• Coolant jumper seal leaks between the manifold and liner

Why Source This From Apex International

Liner bore and head valve-seat dimensions are checked against EMD/DLW references before a power assembly ships, so ring seal and valve seating match what the engine was designed around instead of drifting after the first heat cycle.