Lubrication System Service Information And Troubleshooting - Honda Nighthawk CB 750 1991 Service Manual

Lubrication System
a
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Service Information
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If the engine must be running to do some work. make sure the area is well ventilated. Never run engine in an
enclosed area. The exhaust contains poisonous carbon monoxide gas that can cause loss of consciousness and
may lead to death. Run the engine in an open area or with an exhaust evacuation sysem in an enclosed area.
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Used engine oil may cause skin cancer if repeatedly left in contact with the skin for prolonged periods. Although
this is unlikely unless you handle used oil on a daily basis, it is still advisable to thoroughly wash your hands
with soar, and water as soon as ~ossible after handling used oil.
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The oil pump can be serviced with the engine installed in the frame.
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For oil pressure check, refer to section 4 of the Common Service Manual; for the switch location, see page 16-2 of this
manual.
The service procedures in this section be performed after the engine oil is drained.
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When removing and installing the oil pump, use care not to allow dust or din to enter the engine.
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If any portion of the oil pump is worn beyond the specified service limits, replace the oil pump as an assembly.
After the oil pump has been installed, check that there are no oil leaks and that oil pressure is correct.
Service Information
4-1 Oil Pump Disassembly/Assembly 4-4
Troubleshooting
4-1 Oil Cooler Removal/lnstallation 4-5
Lubrication System Diagram 4-2 Oil Pressure Check 4-6
Oil P u m ~ Removal/lnstallation 4-3
Troubleshooting
Oil Level Low
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Oil consumption
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External oil leak
Worn piston ring or incorrect piston ring installation
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Worn valve guide or seal
Low Or No Oil Pressure
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Clogged oil orifice
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lncorrect oil being used
No Oil Pressure
Oil level to low
Oil pump drive sprocket broken
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Oil pump damaged (pump shaft)
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Internal oil leaks
Low Oil Pressure
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Clogged oil strainer screen
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Oil pump worn or damaged
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Internal oil leak
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lncorrect oil being used
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Low oil level
High Oil Pressure -
Pressure relief valve stuck closed
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Plugged oil filter, gallery, or metering orifice
lncorrect oil being used
Oil Pressure Warning Light Does Not Work Well
Refer to section
25
of the Common Service Manual