How do I know if I need to replace my crankshaft?
Signs of a bad crankshaft
- A forging or casting flaw.
- Insufficient lubrication.
- Bearing wear.
- Loose bearing main caps.
- Distorted bearing bores.
- Improper bearing clearance.
- Bearing failure.
Do you need to upgrade crankshaft?
Forged steel cranks will typically accept more correction than a cast crank. But if the crank is bent beyond the point where it cannot be straightened without weakening or cracking it, it must be replaced. For stock engine rebuilds, a reconditioned stock crankshaft should be more than adequate.
Why does a crankshaft have to be replaced?
Because, of this process the crankshaft is extremely hard but also brittle. When an engine has a bearing failure, the excessive clearance can cause the crank to flex inside the engine. The crankshaft can wear past the point of grinding and have to be replaced. And, If the crankshaft looks like this the con-rod is most likely not resizable.
Why are diesel engines more prone to crankshaft damage?
Many of these issues can happen in any engine but, let’s talk about diesel in this blog. The amount of torque created during a failure, such as a spun bearing can cause a crank to snap. Diesel engines are more prone to crankshaft damage because, diesel crankshafts are extremely hard with higher compression ratios.
When did the Ford 6.9 diesel engine come out?
6.9L IDI Ford Diesel: International began development of the 6.9 L in 1978. It was not until 1983 that Ford offered the 6.9 Diesel option in its 3/4 & 1-ton trucks. The 6.9 L displaced 420 cubic inches, features indirect injection (IDI), and had no turbocharger.
How do you install a new crankshaft on an engine?
Installing the New Crankshaft. Install the bearing caps in their correct places on the engine block. Make sure the numbers on the caps run consecutively from the front to the rear of the engine and the arrows on the caps point to the front of the engine. Install the bearing-caps mounting bolts finger-tight.