
Powerhead
Page 4A-44
90-8M0050731 MAY 2011
4. Check for water marks. When bearing surfaces are subjected to water contamination, a bearing surface etching occurs. This
etching resembles the size of the bearing.
a -
Water marks
5. Check for spalling. Spalling is the loss of bearing surface, resembling flaking or chipping. Spalling is most evident on the thrust
portion of the connecting rod in line with the "I" beam. General bearing surface deterioration could be caused or accelerated
by improper lubrication.
a -
Spalling
6. Check for chatter marks. Chatter marks are the result of a combination of low speed ‑ low load ‑ cold water temperature
operation, aggravated by inadequate lubrication or improper fuel. Under these conditions, the crankshaft journal is hammered
by the connecting rod. As ignition occurs in the cylinder, the piston pushes the connecting rod with tremendous force, and
this force is transferred to the connecting rod journal. Since there is little or no load on the crankshaft, it bounces away from
the connecting rod. The crankshaft then remains immobile for a split second until the piston travel causes the connecting rod
to catch up to the waiting crankshaft journal, then hammers it. The repetition of this action causes a rough bearing surface
which resembles a tiny washboard. In some instances, the connecting rod crankpin bore becomes highly polished. During
operation, the engine will emit a whir or chirp sound when it is accelerated rapidly from idle speed to approximately 1500
RPM, then quickly returned to idle. If the preceding conditions are found, replace both the crankshaft and connecting rods.
a -
Chatter marks
7. Check for uneven wear. Uneven wear could be caused by a bent connecting rod.
a -
Uneven wear
a
8690
a
8691
8692
a
8694
a
Содержание 200 OptiMax Jet Drive
Страница 5: ...Page iv ...
Страница 30: ...General Information Notes 90 8M0050731 MAY 2011 Page 1C 5 ...
Страница 43: ...General Information Notes Page 1C 18 90 8M0050731 MAY 2011 ...
Страница 84: ...Ignition Notes 90 8M0050731 MAY 2011 Page 2A 3 ...
Страница 89: ...Ignition Page 2A 8 90 8M0050731 MAY 2011 Electrical Plate Engine Harness 44731 1 2 3 4 5 6 ...
Страница 147: ...Charging and Starting System Notes Page 2B 36 90 8M0050731 MAY 2011 ...
Страница 153: ...Timing Synchronizing and Adjusting Notes Page 2C 6 90 8M0050731 MAY 2011 ...
Страница 156: ...Fuel Pump Notes 90 8M0050731 MAY 2011 Page 3A 3 ...
Страница 177: ...Direct Fuel Injection Page 3B 14 90 8M0050731 MAY 2011 Fuel Hose Components 4256 3 8 1 8 8 5 8 8 8 8 8 6 7 4 4 2 ...
Страница 179: ...Direct Fuel Injection Page 3B 16 90 8M0050731 MAY 2011 Air Hose Components 4257 1 1 2 3 6 4 5 7 8 9 ...
Страница 245: ...Direct Fuel Injection Notes Page 3B 82 90 8M0050731 MAY 2011 ...
Страница 248: ...Oil Injection Notes 90 8M0050731 MAY 2011 Page 3C 3 ...
Страница 261: ...Oil Injection Notes Page 3C 16 90 8M0050731 MAY 2011 ...
Страница 275: ...Powerhead Page 4A 10 90 8M0050731 MAY 2011 Exhaust Manifold and Exhaust Plate 7 44904 1 2 3 4 5 6 8 10 9 7 ...
Страница 277: ...Powerhead Page 4A 12 90 8M0050731 MAY 2011 Cylinder Head 14 44903 1 2 3 3 4 5 6 7 8 9 10 ...
Страница 283: ...Powerhead Page 4A 18 90 8M0050731 MAY 2011 Ref No Qty Description Torque Nm lb in lb ft 41 1 Hose 42 1 Worm gear clamp ...
Страница 326: ...Powerhead 90 8M0050731 MAY 2011 Page 4A 61 Starboard Side Oil Hose Routing 45579 ...
Страница 327: ...Powerhead Page 4A 62 90 8M0050731 MAY 2011 Port Side Oil Hose Routing 45580 ...
Страница 339: ...Powerhead Notes Page 4A 74 90 8M0050731 MAY 2011 ...
Страница 346: ...Cooling Notes 90 8M0050731 MAY 2011 Page 4B 7 ...
Страница 349: ...Cooling Notes Page 4B 10 90 8M0050731 MAY 2011 ...
Страница 367: ...Pump Unit Page 5A 18 90 8M0050731 MAY 2011 Ref No Qty Description Torque Nm lb in lb ft 41 1 Hose 42 1 Worm gear clamp ...