Marine Gearbox Cooler Cleaning & Pressure Test
Cool Under
Pressure.
Your gearbox cooler is the most critical component in your drivetrain. Neglecting it leads to overheating or catastrophic fluid contamination. We prove its integrity.
Heat Kills Clutches
Marine transmissions rely on friction plates. If your cooler is clogged with scale or debris, fluid temperatures spike, glazing the plates and leading to slipping or total failure.
The "Strawberry Milkshake"
If the internal core corrodes, high-pressure raw water pushes into the low-pressure oil, turning your transmission fluid into a pink sludge that destroys the gearbox instantly.
Hydrostatic Testing
Cleaning isn't enough. We bench-test every cooler under pressure (PSI) to verify that the internal tubes are sound and that no cross-contamination is possible.
Bench Service Protocol.
From clogged and risky to clean and certified.
Remove & Inspect
We extract the cooler from the engine, capping hydraulic lines to prevent leaks, and inspect the end caps for corrosion.
Acid Flush
We circulate a descaling solution (like Barnacle Buster) through the raw water side to dissolve calcium, salt, and marine growth.
Pressure Test
We cap the water ports and pressurize the oil side (or vice versa) with air, submerging the unit to check for even the tiniest bubbles.
Paint & Install
Once passed, we prime and paint the exterior (if metal) and reinstall with new crush washers and hose clamps.
System Integrity.
A small service that saves thousands.
Gearboxes Serviced.
We handle cooling systems for all major marine transmissions.
Common Questions
How do I know if it's clogged?
You often won't know until the transmission overheats or shifts poorly. If the cooler inlet hose is cold but the outlet is hot, flow is restricted.
Can you repair a leaking cooler?
Generally, no. If the internal copper/nickel tubes are perforated, the cooler must be replaced. A patch repair is too risky for the transmission.