SITRAK YZ972553000899 INTERCOOLER ASSY
Product Specifications
| SITRAK | YZ972553000899 |
The INTERCOOLER ASSY is the charge air cooler — commonly called the intercooler — that reduces the temperature of the compressed air delivered by the turbocharger or supercharger before it enters the engine's intake manifold, recovering the density increase that heat of compression has reduced and enabling the engine to combust a greater air mass per cycle for significantly higher power output per unit displacement. The turbocharger compresses intake air to 1.5–3.0 bar absolute depending on the boost pressure calibration, and this compression raises the charge air temperature from ambient — typically 20–40°C — to 130–200°C at the compressor outlet; this hot, low-density air delivers far fewer oxygen molecules per cylinder filling than cool air at the same pressure, and its elevated temperature increases knock tendency requiring ignition timing retard that further reduces efficiency. The intercooler passes the hot compressed charge through an aluminium tube-and-fin or bar-and-plate core where the heat is rejected to the ambient airstream (air-to-air intercooler) or to a coolant circuit (air-to-water intercooler), reducing charge air temperature to within 20–40°C of ambient before it reaches the intake valves; this temperature reduction at constant pressure produces a proportional density increase — a charge air temperature reduction from 160°C to 40°C increases air density by approximately 33%, directly increasing the mass of air and oxygen available for combustion per cylinder stroke. Most current production turbocharged passenger car and commercial vehicle engines use a front-mounted air-to-air intercooler positioned in the bumper airstream ahead of the main coolant radiator.
This unit — SITRAK YZ972553000899 — is manufactured to OEM-equivalent specifications: core dimensions and internal passage geometry, tube pitch and fin density, end tank volume and internal flow distribution design, inlet and outlet charge air pipe connection diameter and orientation, mounting bracket positions, and maximum rated boost pressure are matched to the original part. Supplied as a complete assembly ready for installation. Available wholesale from 111.49 USD, MOQ 5 pcs, production lead time 30-45 days.
Intercoolers fail through external tube and fin corrosion from road salt that progressively degrades thermal efficiency as the fin contact area reduces; through internal oil fouling from turbocharger seal leakage that coats the tube walls with an insulating oil film and restricts the internal passage area, reducing both thermal performance and airflow; through physical tube damage from stone impact or low-speed frontal collision that cracks the tube walls and causes boost pressure leakage; and through end tank cracking from pressure fatigue at the tank-to-core joint. An intercooler with internal oil fouling from a failed turbocharger must be thoroughly flushed before installation or the oil contamination will be ingested into the new engine immediately on startup.
- If the intercooler is being replaced following turbocharger oil seal failure, flush the complete charge air circuit before installing the new intercooler — oil deposits in the charge air pipes, the inlet manifold, and the intercooler end tanks must be removed before the new unit is connected; flush each component individually with degreaser, rinse with hot water, and dry with compressed air; installing a new intercooler into an oil-contaminated circuit immediately begins fouling the new core's internal surfaces from the first boost cycle.
- Inspect the charge air pipe connections and silicone couplers at both the intercooler inlet and outlet before removing the old unit — cracked or hardened silicone couplers at these connections are a common source of boost leaks that produce the same power loss as a failed intercooler; if the couplers show cracking, splitting, or hardening at the clamp zone, replace them simultaneously with the intercooler; a new intercooler paired with a leaking coupler will show no improvement in boost pressure.
- Straighten all bent fins on the new intercooler before installation using a fin comb of the correct fin pitch — transit damage to the core face reduces thermal efficiency and aerodynamic airflow through the fin matrix; a core with 10% or more of its fin area blocked by damage has measurably reduced cooling capacity; straightening fins before installation is significantly easier than after the unit is mounted behind the bumper.
- Verify all charge air pipe clamps are tightened to the OEM torque specification — charge air pipe connections carry boost pressure of 1.5–3.0 bar; an undertightened clamp produces a boost leak that is detectable as a hissing noise under load; overtightening crushes the silicone coupler's cross-section, permanently reducing its internal diameter and restricting charge airflow; typical charge air hose clamp torque is 3–5 Nm for standard worm-drive clamps.
- Cap the intercooler inlet and outlet ports until the moment of pipe connection — the new intercooler's internal passages must not be exposed to workshop dust, debris, or moisture during the installation period; even small particles of debris entering the charge air circuit will be ingested by the engine at high boost velocity during the first full-load acceleration; keep both ports capped until the connecting pipes are immediately ready for fitting.
- Install the new INTERCOOLER ASSY (SITRAK YZ972553000899), connect and clamp all charge air pipes, reassemble the front end structure, start the engine, run to operating temperature, perform a boost pressure leak test by monitoring boost pressure on scan tool live data during a full-throttle acceleration and confirming the target boost is achieved, and check charge air temperature at the intercooler outlet to confirm it is within 30°C of ambient before returning the vehicle to service.
| Part | Reason for Combined Replacement |
|---|---|
| Charge Air Pipe and Silicone Coupler Set Inlet and outlet pipes with clamps — application-specific | The silicone couplers connecting the intercooler to the charge air pipes are subject to heat cycling between ambient and 150°C+ on every boost cycle, and harden progressively over time. A coupler that has hardened cannot conform to the pipe and core stub profiles under boost pressure, producing a boost leak at the clamp zone. Replacing the couplers and clamps simultaneously with the intercooler during the same bumper access operation eliminates boost leaks as an immediate post-repair fault and ensures the complete charge air circuit is sealed to the new intercooler's rated pressure. |
| Turbocharger OEM ref. varies by engine | When the intercooler requires replacement due to internal oil fouling from turbocharger compressor seal failure, the turbocharger must be replaced simultaneously — fitting a new intercooler with the same oil-leaking turbocharger will re-contaminate the new core's internal passages from the first boost event. Replacing both in a single operation eliminates the oil source before it can damage the new intercooler and ensures the complete charge air system is restored to clean, oil-free operation. |
| Air Filter Element OEM ref. varies by engine air box | A partially blocked air filter increases the pressure differential across the turbocharger compressor, forcing the compressor to work harder to achieve target boost and generating more heat of compression that the intercooler must reject. Replacing the air filter simultaneously with the intercooler reduces the thermal load on the new unit from its first operating day, ensuring the intercooler achieves its designed charge air temperature reduction at all boost levels. |