FORD 1531004 INLET WATER
Product Specifications
| FORD | 1531004 |
| FORD | 1098780 |
| FORD | 1301772 |
| FORD | 1472864 |
| FORD | 1483987 |
| FORD | BE8Z8K556A |
| FORD | 7M5G8K556AC |
| FORD | FO1531004 |
The INLET WATER is a cast aluminium or engineering polymer coolant flange — also called the coolant inlet neck, water outlet housing, or coolant pipe connector — that is bolted to the cylinder head, intake manifold, or engine block to provide the structural connection point between the engine's internal coolant passages and the external cooling circuit hoses. The flange body integrates one or more machined pipe stubs or hose barbs that accept the radiator hose, heater hose, or crossover pipe; a flat sealing face with a precision-machined gasket surface that seals against the mating face on the cylinder head or block using a formed rubber gasket or a liquid sealant bead; and on most modern designs, threaded bosses for the coolant temperature sensor, the coolant bleed screw, and — where the thermostat is separately housed upstream — the thermostat bypass return port. The flange is an intersection component in the high-temperature, high-pressure coolant circuit where multiple flow paths converge and diverge; it operates at continuous coolant temperatures of 85–115°C under system pressures of 1.0–1.4 bar, and must maintain a leak-free seal at the gasket face through the thermal cycling of every start-stop cycle across the engine's service life. On turbocharged and high-performance engines the flange also frequently carries the coolant feed for the turbocharger water-cooled bearing housing, adding a third or fourth port to the standard inlet and outlet connections.
This unit — FORD 1531004 — is manufactured to OEM-equivalent specifications: casting profile and sealing face flatness tolerance, mounting bolt pattern and bolt hole diameter, hose stub outer diameter and barb geometry for hose retention, coolant temperature sensor boss thread size and position, bleed screw port position, material grade for compatibility with OAT and HOAT coolant chemistry, and overall assembly weight for bracket load rating are matched to the original part. Supplied as a direct replacement for standard fitment. Available wholesale from 5.67 USD, MOQ 1 pcs, production lead time 25-55 days.
Coolant flanges fail through external corrosion perforation of the aluminium casting from road salt and degraded acidic coolant — the flange's position at the top or front of the engine exposes it to both sources simultaneously; through cracking of the casting body at the stress concentration around hose stubs or sensor bosses from overtightening, impact, or thermal fatigue; and through sealing face warping from previous overheating events or from bolt overtightening that distorts the thin casting wall. A leaking coolant flange that drips onto the exhaust manifold or accessory belt is both a fire risk and a reliability risk — coolant on the accessory belt destroys the belt within minutes of contact.
- Allow the engine to cool fully and drain the coolant to below the flange level before removing the flange — the coolant flange is positioned at or near the highest point of the coolant circuit; removing it from a hot pressurised system releases superheated coolant at 110–120°C; confirm the system is cold and the expansion tank cap releases without pressure before loosening any flange bolt or hose clamp.
- Clean the mating face on the cylinder head or block meticulously after removing the old flange — use a plastic scraper on aluminium and a brass scraper on cast iron to remove all traces of old gasket material and sealant; finish with brake cleaner on a lint-free cloth; a mating face with old gasket residue or sealant buildup prevents the new flange gasket from achieving uniform contact and guarantees a repeat leak at the sealing interface.
- Check the mating face flatness on the cylinder head or block with a precision straight edge before fitting the new flange — a warped head face from a previous overheating event cannot be sealed by any gasket regardless of quality; measure across the full gasket contact area with a 0.05 mm feeler gauge; if any gap is found, have the face machined before fitting the new flange.
- Transfer the coolant temperature sensor and bleed screw to the new flange before installation — apply PTFE tape to the sensor thread where the OEM specification requires thread sealing; torque the sensor to 15–20 Nm using a thin-wall sensor socket; confirm both ports are fully sealed before bolting the flange to the head.
- Torque all flange mounting bolts in a diagonal sequence in two passes — first pass to half the final torque value to seat the gasket uniformly, second pass to the full OEM value; typical torque for a coolant flange bolted into an aluminium head is 8–15 Nm; overtightening distorts the flange sealing face and crushes the gasket beyond its designed compression, producing the same recurring leak as a warped face.
- Install the new INLET WATER (FORD 1531004), reconnect all hoses and clamps, refill with fresh coolant of the correct specification and concentration, bleed the system with the heater on maximum, start the engine, run to full operating temperature, pressure-test to 1.2 bar with the engine off, and inspect all flange joints and hose connections for any seepage before returning the vehicle to service.
| Part | Reason for Combined Replacement |
|---|---|
| Coolant Temperature Sensor OEM ref. varies by engine | The coolant temperature sensor is screwed into the flange body and is disturbed at every flange removal. A sensor that has been operating in degraded coolant for the same period as the failed flange will have the same resistance drift from coolant chemical attack. Replacing the sensor simultaneously with the flange completes the full temperature measurement and sealing service at the flange location and eliminates sensor drift as a post-repair fault code source. |
| Coolant Hose Upper radiator or heater hose — application-specific | The coolant hoses connecting to the flange are disturbed during flange replacement and must be inspected for internal and external degradation simultaneously. A hose that has hardened, cracked, or developed internal delamination at the hose barb connection will fail under system pressure within a short interval after the flange repair, requiring a repeat coolant drain and hose access. Replace any hose showing stiffness, surface cracking, or swelling at the hose clamp positions simultaneously with the flange. |
| Coolant (Engine Antifreeze) OAT or HOAT per OEM specification | Coolant flange failure from external corrosion is almost always associated with coolant that has depleted its corrosion inhibitor package and dropped below pH 7. Refilling with the same degraded coolant after flange replacement immediately begins attacking the new aluminium casting through the same corrosion mechanism that caused the original failure. Always renew the coolant completely when replacing a flange that has failed from corrosion, using fresh coolant of the correct OEM type and concentration to protect the new casting. |