Engine Lubrication System - Lubrication Circuit (SR20DE)
LC-29flowchartSR20DE engine specific lubrication circuit. Flow diagram ref SLC595A; cutaway illustration ref SLC594A.
Lubrication Circuit
SR20DE
SR20DE Lubrication Circuit Flow Diagram
Probable Cause
Corrective Action
Oil pan
Oil strainer
Oil strainer
Oil pump
Oil pump
Regulator valve (Built into pump cover)
Oil pump
Oil filter
Oil filter
Relief valve
Oil filter
Oil cooler
Oil cooler
Relief valve
Oil cooler
Main gallery
Main gallery
Main bearing
Main gallery
Chain tensioner
Main gallery
Chain tensioner
Timing chain
Main gallery
Cylinder head oil gallery
Main bearing
Connecting rod bearing
Connecting rod bearing
Connecting rod
Connecting rod
Piston and cylinder
Cylinder head oil gallery
Camshaft surface
Cylinder head oil gallery
Camshaft journal
Cylinder head oil gallery
Hydraulic lash adjuster
Cause
Oil pan
Fix
Oil strainer
Cause
Oil strainer
Fix
Oil pump
Cause
Oil pump
Fix
Regulator valve (Built into pump cover)
Cause
Oil pump
Fix
Oil filter
Cause
Oil filter
Fix
Relief valve
Cause
Oil filter
Fix
Oil cooler
Cause
Oil cooler
Fix
Relief valve
Cause
Oil cooler
Fix
Main gallery
Cause
Main gallery
Fix
Main bearing
Cause
Main gallery
Fix
Chain tensioner
Cause
Main gallery
Cause
Chain tensioner
Fix
Timing chain
Cause
Main gallery
Fix
Cylinder head oil gallery
Cause
Main bearing
Fix
Connecting rod bearing
Cause
Connecting rod bearing
Fix
Connecting rod
Cause
Connecting rod
Fix
Piston and cylinder
Cause
Cylinder head oil gallery
Fix
Camshaft surface
Cause
Cylinder head oil gallery
Fix
Camshaft journal
Cause
Cylinder head oil gallery
Fix
Hydraulic lash adjuster
NOTE
Flow legend (SR20DE): solid arrow = Oil gallery, open arrow = Oil passage, dash-dot line = By-pass passage, dashed line = To oil pan.