JABSCO Marine Engine Cooling Pump Bronze Flange Mount 1-1/4" Pump Boat PartRegular price $305.73 Save $-305.73
|Manufacturer Part Number:||39846|
|Country/Region of Manufacture:||United States|
A raw water cooling pump must self-prime reliably at a wide range of engine speeds, tolerating sandy or silty water without loss of flow, and without needing frequent maintenance. JABSCO Engine Cooling Pumps do the job, often for years at a time, with little maintenance. This is why JABSCO Engine Cooling Pumps are fitted as standard by marine engine manufacturers worldwide.
- Constructed from marine quality bronze and stainless steel for ruggedness and reliability
- Flow rate: 14 gallons/min at 1500 pm
- Self-priming from dry up to 2.4 m (7.8ft)
- Easy to service and maintain
- Body: Bronze
- Impeller: Neoprene
- Wear plate: Not fitted
- Shaft: 316 Stainless Steel
- Bearings: Single row, ball type
- Port Type: 1-1/4" Hose Barb
- Weight: 5 lb
What cooling water flow rate does an engine need?
On average, petrol engines and fast-running diesel engines with direct cooling require a raw water flow of about 36-39 l (8 - 8.5 gallons) per minute for each 75kW (100 bhp) of engine power. Engines with indirect cooling require more flow: about 65-70 liters (14.5 - 15.5 gallons) per minute for each 75kW (100bhp) of engine power.
Pipework for engine cooling
To provide reliable performance under seagoing conditions, a raw water cooling pump must operate in a correctly-designed cooling system. It is essential that cooling water should reach the pump without having to overcome excessive resistance or restrictions.
The following general rules are given for guidance:
The suction pipe bore must not be smaller than the pump inlet port. If the suction pipe exceeds 3 meters in length, its bore should be one size larger – particularly if the pump is operated at high speeds. Use pipe of the same bore throughout. Avoid sudden changes in pipe bore. Use long, tapered sections of pipe at any change in pipe bore.
The suction pipe run should be as straight as possible – avoid unnecessary bends. Do not use square or standard elbows, but fit long swept bends.
DO NOT fit gearbox or engine oil coolers in the pump suction system. Always install them after the pump.
Seacocks should be of the ball or plug type and of the same nominal bore as the suction pipework, giving full through-bore in the open position. The handle position should clearly indicate whether the seacock is open or closed.
Seawater inlet strainers should have a hole or mesh size no smaller than 3mm in diameter – or 4-5mm for larger pumps. The hole or mesh size should always be smaller than the heat exchanger tube bore.
Check frequently that the inlet strainer is not clogged. If in doubt, clean it thoroughly.
Fast boats (over 12-15 knots) and planing craft must be fitted with inlet scoops positioned in a permanently-wetted area of the boat’s hull, to create sufficient inlet pressure at high boat speed. Flush inlet fittings are not suitable for fast boats.