The 7MGTE engines are an in-line six cylinder engine with the cylinders numbered from the front of the engine. The crankshaft is supported by seven bearings specified by the inside of the crankcase. These bearings are made from kelmet.

The crankshaft is integrated with eight weights which are cast along with it for balancing. Oil holes are built into the crankshaft for supplying oil to the conrods, pistons and other components.

These engines ignition order is 1-5-3-6-2-4. The cylinder head is made of aluminium alloy, with a cross-flow type intake and exhaust layout and with pent-roof type combustion chambers. The spark-plugs are located in the centre of the combustion chambers.

Exhaust and intake valves are equipped with irregular pitch springs with symmetrical ends made of oil tempered silicon chrome-steel wire which are capable of following the valves even at high engine speeds.

Both the exhaust sides camshaft and the intake sides camshaft are driven by a single timing belt. The cam journal is supported at seven places between the valve lifters of each cylinder, and on the cylinder head front end. Lubrication of the cam journal and cam is accomplished by oil being supplied through the oiler port in the centre of the camshaft.

Adjustment of the valve clearance is done by means of an outer shim type system, in which valve adjusting shims are located above the valve lifters. This permits replacement of the shims without removal of the camshaft.

The resin timing-belt cover is made in two pieces. Pistons are highly temperature resistant aluminium alloy and depressions are built into the piston head to prevent interference with valves.

Piston pins are of the full-floating type, with the pins fastened to neither the piston boss nor  the conrods. Instead, snap rings are fitted on both ends of the pins, preventing the pins from falling out.

The number one compression ring is made of stainless steel and the number two compression ring is made of cast iron. The oil ring is made of a combination of stainless steel. The outer diameter of each piston ring is slightly larger then the diameter of the piston and the flexibility of the rings allows them to hug the cylinder walls when they are mounted on the piston. Compression rings number one and two work to prevent the leakage of gas from the cylinder and the oil ring works to scrape oil off the cylinder walls to prevent it from entering the combustion chamber.

The cylinder block is made of cast iron. It has six cylinders which are approximately 1.6 times the length of piston stroke. The top of the each cylinder is closed off by the cylinder head and the lower end of the cylinders becomes the crank-case, in which the crankshaft is installed. In addition, the cylinder block contains a water jacket, through which coolant is pumped to cool the cylinders.

The oil-pan is bolted onto the bottom of the cylinder block. The oil-pan is an oil reservoir made of pressed steel sheet. A dividing plate is included inside the oil-pan to keep sufficient oil in the bottom of the pan, even when the vehicle is tilted. This dividing plate also prevents the oil from making waves when the vehicle is stopped suddenly and thus shifting the oil away from the oil pump pick-up.