Cooling
Cummins QSB Aftercooler Rebuild
Full aftercooler strip, clean, inspection, and reassembly. Includes raw water pump rebuild, gearbox oil cooler re-solder, and fuel cooler re-solder — all pressure verified.
Marine cooling · Manly, Brisbane
Marine Engine Cooling System Repairs in Brisbane
Seadog Marine specialises in marine engine cooling systems in Manly, Brisbane. We diagnose overheating, coolant loss and poor raw water flow across the full system, including heat exchangers, aftercoolers and raw water pumps.
Workshop
Manly, Brisbane
Service area
Brisbane & South East Queensland
Approach
Inspect · explain · repair
The service
Good cooling work starts with finding the real cause.
Clear findings and practical options, grounded in the condition of your component and the wider system.
An overheating engine does not automatically mean the heat exchanger is at fault. The raw water intake, strainer, pump, hoses, thermostat, coolant circuit and exhaust water flow can all influence the result. We investigate the system rather than replacing parts without understanding the cause.
Tell us whether the temperature rises at idle, at cruise or under load, whether the issue is intermittent and what work has already been done. These details help direct the checks alongside inspection of the vessel's cooling circuits.
From our Royal Queensland Yacht Squadron workshop in Manly, we support vessel owners across Brisbane, Moreton Bay and the major Gold Coast marinas. On-site work is available where access permits. If the engine is overheating, stop using it and seek advice rather than continuing to run it under load.
Workshop scope
Work included
- Raw water intake, strainers and through-hull checks
- Raw water pump and impeller assessment
- Heat exchanger and aftercooler inspection
- Hose, clamp and seawater plumbing checks
- Thermostat and coolant circuit fault-finding
- Investigation of restrictions, leaks and overheating patterns
What to look out for
Common symptoms
These signs can point to a cooling fault. Inspection helps identify the cause.
- Overheating at idle or under load
- Intermittent temperature spikes
- Coolant loss or repeated alarms
- Weak water discharge at the exhaust
- Recurring cooling faults after previous repairs
From the workshop
Real jobs. Real components.
Examples of the hands-on work behind this service.
Cooling
Leaking Yanmar Heat Exchanger Repair
Heat exchanger leak repaired — pressure tested and returned to service.
Pumps
Johnson Pump — Full Rebuild
Complete Johnson pump rebuild — new bearings, seals, and impeller fitted and tested.
Straight answers
Questions vessel owners ask.
Share what you know about the engine and the problem. We can help work out the next step.
Which marine cooling components do you work on?
Our work includes raw water pumps, heat exchangers, aftercoolers and seawater plumbing, together with full cooling system diagnosis for overheating and coolant loss.
Why does my marine engine overheat only at cruise?
Different operating conditions can reveal flow restrictions, pump problems or reduced heat transfer. The pattern is useful information, but inspection is needed to identify the cause on your engine.
Can you help with an intermittent overheating fault?
Yes. Record when it happens, the operating conditions, temperature readings and any coolant or water-flow changes. Share those details and the repair history when contacting us.
Where is your cooling system workshop?
Seadog Marine is based at Shed 3, Royal Queensland Yacht Squadron, 578 Royal Esplanade, Manly QLD 4179. Contact us to discuss vessel access and the work needed.
Talk through your cooling issue
Start with the details you have.
Tell us the engine model, symptoms and vessel location. We’ll discuss an appropriate next step.