Here's why it's complicated:
* Extent of damage: A single rod bearing failure *could* be relatively isolated. The repair would involve replacing the connecting rod, bearing, and possibly the crankshaft if it's scored. This could be a relatively inexpensive repair if caught early. However, a rod bearing failure often indicates other problems, possibly including damage to the crankshaft, cylinder walls, and even the oil pump. The more damage, the more expensive the repair.
* Labor costs: Engine repair is labor-intensive. Even a seemingly straightforward repair can involve significant labor charges. This is true even if you find a shop willing to rebuild your engine instead of using a replacement block. The labor costs for a rebuild are comparable to the labor to pull and install a used engine.
* Cost of parts: Replacement connecting rods, bearings, and even a crankshaft aren't cheap. If additional damage exists, the cost will climb rapidly.
* Used engine cost: A used engine of comparable mileage could be surprisingly affordable, especially if you find a reputable salvage yard or rebuilder. The cost of installation, however, needs to be added.
To determine which is cheaper:
1. Get a professional diagnosis: Take your Saturn to a reputable mechanic for a thorough inspection. They need to determine the extent of the damage. A simple visual inspection might not be enough. They might even need to partially disassemble the engine to assess the damage accurately.
2. Get repair estimates: Once the damage is assessed, get detailed repair estimates from at least two mechanics. This will outline exactly what parts need replacing and the labor involved.
3. Get used engine quotes: Get quotes for a used engine of comparable mileage and condition, including installation. Factor in the cost of any necessary gaskets and fluids.
4. Compare: Only after getting these quotes can you accurately compare the cost of repair versus engine replacement.
In short, while a *small* amount of damage from a single rod bearing failure *might* be cheaper to repair, the odds are that the total cost will be close to replacement. The professional diagnosis is absolutely crucial to making an informed decision. Don't try to guess; get the expert evaluation first.
