1. What causes Cummins ISB 5.9 head gasket failure?
a. Tear and wear
b. Excessive cylinder pressure or boost pressure
c. Incorrect torque
d. Overheating
2. Can I drive with a blown head gasket?
It is not recommended to drive with a blown head gasket because it could cause damage to other engine components, such as the cylinder head cracked, cylinder head warped, liners scoring, and engine block surface cracked.
3. What are the symptoms of a bad valve stem seal?
These are the symptoms of a bad valve stem seal;
a. Blue smoke at the start-up?
b. Increase Engine oil consumption
4. Can you replace the valve stem seal without removing the cylinder head?
Yes, you can replace the valve stem without removing the cylinder head by using some methods such as rope method or compressed air.
5. What are the signs of a bad intake manifold on ISB 5.9?
a. It causes boost pressure leaks
b. Causes whistle sound
c. Poor throttle response
d. Engine light on
6. What material is used to make the ISB 5.9 intake manifold?
The intake manifold material is made of cast aluminum.
7. Can I reuse the valve cover seal in ISB 5.9?
The answer is no. The seal is a rubber seal, so it is degraded and compressed and cannot be reusable.
8. Do I need RTV when installing the valve cover seal of ISB 5.9?
The answer is no. RTV is a sealant, but it is not necessary when installing the valve cover because the rubber can compress and seal.
9. How do you check the main bearings on ISB 5.9?
These are a few ways to check the main bearings on this engine;
a. Remove the oil sump and inspect the main bearings cap
b. Use a micrometer to check the crankshaft journal diameter
c. Use plastigauge to check oil clearance.
10. Should I use the standard or oversized main bearing?
If the crankshaft is still standard, then you should use standard bearings, but if the crankshaft has been grinding, then you should use oversized bearings such as 0.010, 0.020, and 0.030.