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Jazyk případu:

Cooling fluid leaking into combustion chamber

23.05.2023 | aktualizováno 23.05.2023 12:27:09 0 88x

Informace o vozidle

VIN: 1FA6P8CFXG5285457
Výrobce: Ford
Model: Mustang
Rok výroby: 2016
Kód motoru: 5.0 V8 ROUSH 2.stage
Typ motoru: MF8F
Výkon (kW): 534 kW
Převodovka: Manuální
Palivo: Benzín
Najeto: 62 000 km

Jak se závada projevuje

Jiné. Heavy smoke from the exhaust accompanies morning starts, and the customer has to top up the coolant from time to time.

Jak často se závada projevuje

  • Trvale přítomná závada.

V jakém systému se závada vyskytuje

  • Motoru.
  • neukládá žádný chybový kód

Závěr

VOZIDLO JSEM NEOPRAVOVAL, PROVÁDĚL JSEM DIAGNOSTICKÉ PRÁCE

The customer brought the vehicle in for a coolant leak diagnosis. A leak into the combustion chamber was suspected initially, which would have entailed a costly repair. Therefore, he asked us to confirm if the coolant was leaking into the combustion chamber.

The gas analyser confirmed that the coolant contains gases generated during combustion, mainly CO2. Since I wasn't sure if the exhaust gases were coming into contact with the coolant somewhere else on this engine, I performed a relative compression test which identified the cause.

Coolant is entering cylinder no. 7. Not only will the engine have a combustion problem on this cylinder, but there's a risk of damage to the connecting rod and other components.

Obrázky, fotografie a soubory

Mustang 737HP

Mustang 737HP (15763/9)

illustration image
LOG recording of gases in the coolant tank

LOG recording of gases in the coolant tank (15763/12)

The gas analyser showed that gases resulting from combustion were present in the coolant tank, which is clear evidence that the combustion chamber has an issue with cooling circuit integrity.
Relative compression test

Relative compression test (15763/14)

A relative compression test with synchronisation revealed the problem with cylinder no. 7, which is the driver's side cylinder head.
Exhaust smoke

Exhaust smoke (15763/15)

After pressurising the system by driving and shutting it down until the next day, the pressure moved from the system to cylinder no. 7. This caused an increase in compression. The risk is that the connecting rod can be distorted when the cylinder is full of coolant.

Soubory ke stažení

  • xlsx
    Initial LOG (15763/10).xlsx The initial wide LOG – without any abnormality
    Stáhnout soubor
  • xlsx
    LOG recording of gases in the coolant tank (15763/11).xlsx The gas analyser showed that gases resulting from combustion were present in the coolant tank, which is clear evidence that the combustion chamber has an issue with cooling circuit integrity.
    Stáhnout soubor
  • mwf
    Relative compression test (15763/13).mwf A relative compression test with synchronisation revealed the problem with cylinder no. 7, which is the driver's side cylinder head.
    Stáhnout soubor

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