1. What is the common sign of a worn connecting rod?
These are the signs that the connecting rod is bad: knocking sound, engine vibration, metal shavings in the oil, loss of oil pressure, and, most importantly, engine failure.
2. What is the connecting rod bearing clearance for the 12.7L engine?
It is recommended that you use 0.002 to 0.003 inches. However, you should also check the service manual for more clarification.
3. What are some common signs of a failing crankshaft?
The common signs are low oil pressure, serious knocking noise, crankshaft sensor error indicator, metal shavings in the oil, and engine vibration.
4. Can a 12.7L crankshaft be machined?
Yes, the crankshaft can be grinded or machined. But after machining the crankshaft, you need to use the right bearings; the bearings could be oversized or undersized.
But grinding the crankshaft is only possible if it is still within the tolerance.
5. What are the common signs of a damaged cylinder head?
The signs are;
a. Overheating
b. Loss of compression
c. White smoke from the exhaust due to coolant burning.
d. Oil and coolant mixture
e. Coolant loss without leakage
f. Visible crack on the cylinder head
6. Can the cylinder head be resurfaced?
Yes, the cylinder head can be resurfaced. But this should be done within the Detroit Diesel thickness tolerance.
Check the service manual for the thickness tolerance.
7. What are the common symptoms of a bad piston?
These are certain signs of a bad piston in the 12.7L Engine:
- Piston slapping the cylinder wall.
- Oil burning, which results in oil consumption. Oil consumption will also cause blue smoke. There will also be a loss of power and blow-by smoke.
8. What material is the piston made of?
The material for the standard piston of this engine is cast aluminum alloy. While some aftermarket pistons could be forged aluminum for added strength.
9. What is the boost pressure for the turbo of a 12.7L Engine?
For a stock turbo, the boost pressure should be between 20-35 psi. This depends on the applications and the engine tuning.