Toro Groundsmaster 455-D Service Manual page 41

Noisy Engine
Problem
Knocking
Whistling, blowing
Groundsmaster 455-D
Possible Causes
Loose main bearings
Broken part
Leakage return collector clogged
Lifters out of adjustment
Foreign matter in a cylinder
Seized injector
Injection pump timing
Sheared glow plug
Timing out of adjustment
Leaking cylinder head gasket
Leaky glow plug
Valve seats
Leaky injector
Page 3 - 23 Rev. B
Engine