Vehicles using TD 27 engine list:

Engine TD 27

Symptoms:
- Hard starting or failure to start, especially when cold
- Excessive smoke from the exhaust (black or white)
- Loss of power and poor acceleration
- Rough idling and engine knocking
- Overheating under load or in traffic

Diagnosis:
- Check fuel system for clogged filters, air in lines, or faulty injectors
- Inspect glow plugs for proper operation, especially in cold conditions
- Examine turbocharger (if equipped) for wear or boost leaks
- Test compression to identify worn piston rings or valves
- Inspect cooling system for leaks, thermostat function, and radiator condition

Fixes:
- Replace fuel filters regularly and bleed air from fuel lines to ensure proper fuel delivery
- Replace faulty glow plugs to improve cold starting
- Clean or rebuild injectors to restore proper spray pattern and fuel atomization
- Repair or replace worn turbocharger components or fix boost leaks
- Perform engine overhaul if compression is low due to worn rings or valves
- Flush cooling system, replace thermostat, and repair leaks to prevent overheating

Prevention:
- Adhere to regular maintenance schedules, including timely oil and filter changes
- Use high-quality diesel fuel and additives to keep injectors clean
- Avoid prolonged idling and excessive engine loads to reduce wear
- Monitor coolant levels and condition frequently to prevent overheating
- Periodically check and replace air and fuel filters to maintain engine efficiency

The TD 27 engine is robust but requires consistent maintenance to avoid common diesel engine issues such as injector clogging, glow plug failure, and cooling system problems. Early diagnosis and preventive care can significantly extend engine life and reliability in Nissan Pathfinder and Terrano models from 1986 to 1995.