Honda ACCORD HYBRID 2005 Service Manual page 281

Operation
During 6 Cylinder Mode (Intake valve side)
The VTEC spool valve switches oil pressure. Oil pressure then enters primary rocker arm A f r o m the oil passage in the
intake rocker shaft, and it moves the VTEC switching piston in the rocker a r m . This causes the VTEC s w i t c h i n g piston
to slide into p r i m a r y rocker arm B, locking primary rocker arms A and B together. Primary rocker arms A and B are
then actuated by the secondary rocker a r m .
S E C O N D A R Y ROCKER ARM
During 6 Cylinder Mode (exhaust valve side)
The VTEC spool valve switches oil pressure. Oil pressure then enters p r i m a r y rocker arm A f r o m the oil passage in the
exhaust rocker shaft, and it moves the VTEC switching piston in the rocker a r m . This causes the VTEC switching piston
to slide into primary rocker arm B, locking primary rocker arms A and B together. Primary rocker arms A and B are
then actuated by the secondary rocker a r m .
PRIMARY ROCKER ARM B R E T U R N PRIMARY ROCKER ARM A
To DRAIN
W h e n the engine is off, the VTEC switching piston is held in the engaged position by the return spring. This allows the
rocker arms to operate w h e n oil pressure is l o w during cranking.
(cont'd)
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