Pumps
Johnson Pump — Full Rebuild
Complete Johnson pump rebuild — new bearings, seals, and impeller fitted and tested.
Marine cooling · Manly, Brisbane
Raw Water Pump Rebuilds in Brisbane
Seadog Marine rebuilds and repairs marine diesel raw water pumps from our Manly, Brisbane workshop. We inspect the complete pump, not just the impeller, to identify worn bearings, leaking seals and housing damage.
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.
A raw water pump moves seawater through the engine's cooling circuit. An impeller change alone may not resolve a leaking shaft seal, rough bearing or worn housing. We assess the pump's condition and explain the repair, rebuild or replacement options before proceeding.
Our documented work includes Johnson, Sherwood, Yanmar 3GM, Ford Lees and Cummins raw water pump rebuilds, plus a manufactured replacement shaft for a Perkins 6.354-4 pump. Visit the examples below to see actual workshop work rather than generic product photos.
Based at the Royal Queensland Yacht Squadron in Manly, we service vessels across Brisbane, Moreton Bay and South East Queensland. Send the engine model, pump brand or part number, photos and a description of the fault when requesting an estimate.
Workshop scope
Work included
- Bearing and bearing-housing inspection
- Mechanical seals, O-rings and shaft condition
- Impeller condition, clearance and replacement needs
- Housing wear, corrosion and damage assessment
- Pulley, belt alignment and drive coupling checks
- Repair, rebuild or replacement advice based on the pump's condition
What to look out for
Common symptoms
These signs can point to a cooling fault. Inspection helps identify the cause.
- Seawater leaking around the pump or shaft seal
- Noisy or rough pump bearings
- Reduced water discharge at the exhaust
- Engine overheating under load
- Repeated impeller problems
From the workshop
Real jobs. Real components.
Examples of the hands-on work behind this service.
Pumps
3GM Yanmar Raw Water Pump — Full Rebuild
Complete raw water pump rebuild on a Yanmar 3GM — new bearings, seals, and impeller.
Pumps
Sherwood Raw Water Pump Rebuild
Full rebuild of Sherwood raw water pump — new bearings, seals, and impeller.
Straight answers
Questions vessel owners ask.
Share what you know about the engine and the problem. We can help work out the next step.
Is a raw water pump rebuild the same as an impeller replacement?
No. Replacing the impeller addresses one wearing part. A rebuild considers bearings, seals, shaft condition and the pump housing as well. The work needed depends on what inspection finds.
Can every marine raw water pump be rebuilt?
Not always. Severe housing corrosion, wear or damaged components may make replacement more appropriate. We assess the pump before recommending a repair or replacement.
What should I send for a rebuild estimate?
Include the engine make and model, pump brand or part number if known, clear photos and details of leaks, noise or overheating. Tell us where the vessel is located and whether the pump is still fitted.
Do you service pumps outside Manly?
We service vessels across Brisbane, Moreton Bay and South East Queensland. Contact us to discuss your location and access; on-site work is available where access permits.
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.