How to know if it’s time for engine overhaul or not? It’s actually not complicated — the engine will tell you itself. And what’s more cost-effective — to restore the engine or get rid of the car? It all depends on how much the repair will cost.
Warning Signs
An engine needing overhaul communicates this in various ways:
- Increased oil consumption
- Difficult starting
- Smoke from exhaust pipe
- Poor engine performance while driving
- Engine starts jerking – misfiring, etc.
- Oil pressure drops
- Loss of compression in cylinders
Any of these symptoms can be grounds for major repair. The same applies to serious violations of operating conditions. For example, if an owner drove without an air filter, causing abrasive wear of the cylinder-piston group. Another “careful” owner drove through a deep puddle, causing hydro lock. A third delayed timing belt replacement until it broke. In all these cases, the engine will need repair. But how much will it cost? No mechanic can answer this question without preliminary disassembly and engine inspection.
When Can Overhaul Be Postponed?
Sometimes major engine repair can be postponed indefinitely. Here are such situations:
- “Professional” scams for engine repair, which can happen both on the road and in dishonest auto services
- Issues with fuel and engine management systems, exhaust system, engine mounts, and even automatic transmission are mistaken for mechanical engine problems
- Engine parameters — for example, engine oil consumption — haven’t reached critical levels
Overhaul Methods
They overhaul either the “head” (cylinder head), cylinder block, or both. Sometimes the crankshaft needs work too. The overhaul can be partial or complete.
What kind of overhaul does your engine need? Preliminary control measurements of everything should be done – starting with cylinder condition and piston clearances, examining bearings and measuring crankshaft journal diameter, assessing pin clearances, etc.
Partial Overhaul Usually Includes:
- Rings
- Seals
- Bearings
- Gaskets
Complete Overhaul Adds:
- Pistons
- Oil pump
- Valve guides
- Valves themselves + cylinder boring, head resurfacing, and possibly crankshaft repair.
Used Engine Option
What about skipping all these boring operations and getting a so-called “second-hand” engine? That’s possible too. Most likely, you’ll even save money. But still, don’t forget that you’re buying not a new, but a used unit! As for savings – say, if there’s a chance to reduce costs by half – you should still think carefully: why is this engine so cheap? A working engine can’t be cheap.
How to Drive After Major Repair
The requirements are generally known. H Here are QueensATS’s main recommendations:
- Mandatory engine warm-up before driving (even brief)
- Driving without sharp accelerations and engine braking
- Avoid driving under strain, towing, overloading, etc.
All this is necessary to avoid harming the engine that has gained its second youth. We often get asked: ” How long will engine break-in take?” There’s no exact answer and can’t be. But you can count on 650 miles – that’s the minimum. Don’t hesitate to change engine oil and filter more frequently – let all kinds of metal shavings and other nasty stuff finally leave the engine.
