Oil Pressure Testing

What Is Viscosity? Viscosity is a fluids resistance to flow. Low viscosity – Thin oil High viscosity – Thick oil

What Are The Functions Of Oil? To cool To lubricate To seal To dampen noise It allows any worn particles to be returned to sump

Manual Checks To Be Carried Out Before Testing Change the oil Change the oil filter Check the electrical connections on the oil pressure switch It is very important that the oil and filter has been changed as this can affect your findings

Visual Checks To Be Carried Out Before Testing Check around the sump and bell housing for any signs of leakage Check front engine oil seal and pulley for any signs of leakage Check oil filter and filter housing for any signs of leakage Check fuel pump and engine components for tightness of bolts Dip engine for oil Make sure there is sufficient diesel in tank for starting

Pumps – What Is The Function Of A Pump? The function of a pump is to generate flow in a system

Different Types Of Pumps Piston type Gear type – most commonly used in lubrication systems Vane type Roller type Impeller type Screw type

What Is Pump Displacement? Pump displacement is the amount of fluid that a pump can move per stroke Remember – Pressure results from a resistance to flow

Reasons For Abnormal Oil Pressure Low oil level in the sump Oil worn out/broken down Leaks Worn bearings Relief valve not seated properly Wrong grade of oil Worn or perished seals If the oil is too thin this will result in low oil pressure If the oil is too thick this will result in high oil pressure

Film of oil between surfaces (shaft & bearing) Oil feed Bearing housing Oil clearance Bearing cap Shell bearing Film of oil between surfaces (shaft & bearing)

Procedures To Be Followed To Carry Out The Test Remove oil pressure sender unit or the plug in the side of the engine block Connect up the gauge Start up the engine Bring the engine up to normal running temperature/manufactures spec Make a note of your findings Compile a report

Manufacturers Specifications For The Lubrication System of Perkins Engine Dip the engine for oil and check oil pressure evry day or every 8 hours Replace oil and oil filter every 500 hours or 12 months Only use good quality oil with a grade of 15W40 which is suitable for irelands temperatures and climate According to the specifications of this engine the lubricating oil pressure at normal running temperature should be…… 300kPa – 43lbf/in – 3.0kg/cm