650LK (Turbo)

Turbo Lubrication System

Submitted by xjcdadmin on Thu, 06/04/2009 - 18:47


The turbo unit is pressure-lubricated from the main engine oil gallery. A check valve is installed on the outlet o' the engine main oil gallery to stop oil flow to the turbo unit when the engine is not running. A scavenging pump rotor is equipped behind the original oil pump rotor to retrieve the oil from the turbo unit, ensuring a constant flow of oil.

Check valve opening pressure: 24.5 kPa (0.25 kg/cm , 3.56 psi)

Carburettor and Intake

Submitted by xjcdadmin on Thu, 06/04/2009 - 16:52


The carburetor is a fully-enclosed type BS30; float chamber ventilation is opened to the surge tank, because the float chamber must always be under boost pressure in order to supply sufficient fuel to the venturi.


Fuel Pump

Submitted by xjcdadmin on Thu, 06/04/2009 - 16:49


The fuel pump is operated by a DC motor that is directly coupled to the pump. Fuel from the fuel cock is drawn into the pump, flows around the motor to the outlet at the opposite end of the housing, and then is fed through the check valve.

Components and Layout

Submitted by xjcdadmin on Thu, 06/04/2009 - 16:47



1. Connect fuel hose 1 to the fuel cock "OUT".

2.  Connect fuel hose 6 to the fuel cock "IN".

3.  The center mark on the fuel pump should be located in the upper center of the damper stay as shown in the illustration.

Intake Components

Submitted by xjcdadmin on Thu, 06/04/2009 - 16:23


The intake system consists of an air cleaner, a surge tank, a reed valve, and a relief valve. All work together to provide the correct amount of air over the entire range of the engine's performance requirements, from low to high speeds.


Inspection (Exhaust Components)

Submitted by xjcdadmin on Thu, 06/04/2009 - 16:17



1. Ensure that the turbine and compressor rotors turn smoothly.

2.    Ensure that the actuator valve and waste-gate assembly operate correctly.

3.    As the turbine is turned it should not bind at any point, there should be no side play, and there should be no axial play in the turbine/compressor shaft.

Disassembly (Exhaust Components)

Submitted by xjcdadmin on Thu, 06/04/2009 - 16:10


The exhaust system is composed of exhaust pipes, an exhaust chamber/turbocharger assembly, and mufflers. The turbocharger is operated by the engine's expelled gases and this in turn operates the compressor rotor, which creates the boost pressure for the combustion chambers. The boost pressure is controlled by a wastegate that channels unneeded exhaust out the right hand muffler. See the block diagram below.