1. How often should I replace the fuel filter on Cummins 4B?
The fuel filter should be replaced after 250 to 500 of operation, this depends on the operation of the engine.
For more information on this, check the service manual.
2. What are the symptoms of a clogged fuel filter?
a. Hard starting
b. Rough idling
c. Loss of power
d. Warning light
e. Visible dirt in the visible part of the filter.
3. How long does a 4B head gasket last?
The head gasket can last for 200,000 miles. It can also last longer than that. However, if there is overheating, incorrect installation, or poor torque, then the head gasket can have issues at any time.
4. Should you resurface the cylinder head before installing a new head gasket?
No, it is not a must that you resurface the cylinder head or the engine block; rather, you should check if it’s warped or pitted, then you should resurface it.
5. At what temperature does the 4B thermostat open?
The thermostat opens at 180°F (82°c) or 190°F (88°C). Which is dependent on two factors, such as applications and climate.
6. Symptoms of a bad thermostat on the Cummins 4B?
These are the signs of a bad thermostat;
a. Slow warm-up
b. Temperature gauge fluctuation
c. Engine running too cold
d. Overheating of the engine
7. How often should the valve adjustment be done on 4B?
At every 15,000 miles, the valve adjustment should be checked or readjusted. But if you are using hours, then you should do that at 500 hours of operation.
However, you should also make adjustments whenever you replace the head gasket or repair the camshaft.
8. What are the symptoms of valve issues on 4B engines?
These are the most notable signs of valve problems on 4B Cummins: low compression, hard starting, white smoke from the exhaust, loss of power, and engine noise, especially ticking noise.
9. When should the oil pump be replaced on a Cummins 4B?
The oil pump should be replaced during the engine overhaul.
You should also replace the when you notice signs of damage to the oil pump, such as low oil pressure.
10. What causes a worn oil pump in the Cummins 4B?
These are the causes of oil pump failure;
a. Contaminated oil
b. Bad oil relief valve
c. Incorrect oil viscosity or oil grade
d. Worn gear