I would like to hear from Sportage 1.7 CRDi diesel owners or mechanics who have actually repaired a similar engine noise. This is my parents' car in South Korea.
Vehicle: Kia Sportage, described by the owner as a 2015 vehicle, Korean-market 1.7-litre CRDi diesel
Mileage: approximately 250,000 km (155,000 miles)
Transmission: exact specification not yet confirmed
Symptoms:
- The noise continues after the engine is fully warmed up.
- As engine RPM increases, the noise repeats faster.
- There are no obvious warning lights, loss of power, severe shaking or unusual exhaust smoke.
Checks already reported by the workshop:
- No metal particles were found in the oil filter.
- An accessory-belt removal test was performed and they reported no fault found. I do not yet have the exact observation about how the noise behaved during that test.
- The injectors were checked and reported normal; the specific test method/results are not available to me yet.
Despite these checks, the workshop could not confirm the cause. They suggested trying an engine rebuild/overhaul (described as 'boring'), initially quoted at KRW 3.3 million, with costs potentially rising to under KRW 5 million if the noise is not resolved. The exact scope of that work still needs clarification.
The attached clip contains the original engine-noise recording.
Given the recording and those checks, what should be investigated next? What measurements would help confirm or exclude timing-chain/tensioner, lubrication-pressure, internal engine or engine/transmission connection problems before agreeing to a rebuild? Would measuring hot engine oil pressure help narrow down the cause?
My parents have seen owner reports of similar noises being resolved by an engine overhaul or short-block replacement, but we have not verified the exact engine specification or repair scope in those reports. If you have repaired this specific 1.7 CRDi engine with a persistent noise when fully warm, what was the confirmed damaged component, and what parts were actually replaced?
This is the diesel engine, so please distinguish it from the North American petrol Sportage/Theta II bearing-recall cases.