* Engine Rings: Replacing rings requires engine disassembly, machining the cylinder walls (potentially), installing new rings, reassembling the engine, and resealing everything. This is a significant undertaking, requiring specialized tools and expertise. The cost will vary dramatically depending on labor rates in your area and whether you do any of the work yourself. Expect a bill in the hundreds to possibly over a thousand dollars, depending on the situation.
* Engine Replacement: A used engine for an '86 Ranger can be relatively inexpensive, but you still have the cost of installation, potentially some minor repairs to make it compatible, and the cost of fluids and other consumables. This will likely be more expensive than a ring job, perhaps several times more, especially if you pay for professional installation.
The Blue Smoke Clue: Blue smoke usually indicates burning oil, and worn piston rings are a common cause. However, other issues *could* cause blue smoke, such as valve stem seals or even a severely cracked head. A mechanic needs to diagnose the *exact* cause of the blue smoke before deciding on a repair.
The Bottom Line: While a ring job is *potentially* cheaper than a full engine replacement, you need a mechanic to assess the damage. They can tell you:
* The extent of the damage: Are only the rings worn, or is there significant cylinder wall scoring? Significant damage might make a ring job impractical or ineffective.
* The overall condition of the engine: If the engine has other major issues (beyond the rings), a replacement might be more cost-effective in the long run.
Recommendation: Get a professional inspection and quote for both ring replacement and engine replacement. This will give you the clearest picture of the cost-effective solution. Attempting this repair yourself without experience could lead to more significant and expensive problems.
