18
Superior
Technology
Hydraulic bucket tappet
All Volkswagen Marine boat engines are
equipped with hydraulic bucket tappets.
In addition to reducing noise, they also simplify
servicing:
• No need to check and adjust valve clearance
• Precision valve timing
The hydraulic bucket tappets essentially
comprise:
• Bucket tappet with piston
• Cylinder
• Non-return valve
Engine mechanical systems
Valve noise after starting the engine
is a normal occurrence. Oil is forced
out of the bucket tappet while the
engine is inoperative. As soon as the
engine is running, the high pressure
chamber is filled with oil again and
the valve noise disappears.
MSSP_001_012
Bucket tappet
Piston
Cylinder
Compression
spring
Camshaft
Oil reservoir
Non-return
valve
Oil feed
High pressure
chamber
Valve stem
Summary of Contents for SDI 55-5
Page 51: ...51 Superior Technology Notes ...
Page 83: ...83 Superior Technology Notes ...