Please select your home edition
Edition
PredictWind.com 2014

Sailboat Engine Secrets - Change Your Impeller to Keep a Cool Engine!

by John Jamieson on 5 Nov 2011
Figure 1 Captain John Jamieson
When was the last time you checked your sailboat engine raw-water impeller? It's one vital part that keeps your engine cool and happy all season long. In this article, John Jamieson (Captain John) of SkipperTips.com shows you how to make this task simple and easy as 1-2-3:

Your raw water pump draws water from the sea, through the sea-water strainer and up to the engine. In small diesel engines with separate fresh water systems, sea water provides a cooling jacket to lower internal temperatures. In straight raw-water cooled engines, you need every bit of that sea water circulation to keep your engine cool and happy.

Follow the raw water hose from the seacock, through the strainer and up to the front of your engine. Here, you will see the impeller pump cover (see photo of impeller pump). Marine diesel engine guru and author Peter Compton recommends that you follow these steps next along with the illustrations:

Remove the Old Pump.



1. Remove the cover, cover plate and gasket (or O-ring). Look at the vanes and note which way they bend (left or right).
2. Pry off the central plug that holds the vane into the housing.
3. Use two flat-head screwdrivers to carefully pry out the impeller pump. Take care not to damage the vanes.

Inspect the Pump and Pump Parts.

1. Check all around the vanes for cracks, hardening, wearing or melting.
2. If you notice missing chips of rubber, this means particles of rubber impeller could have lodged themselves in the heat exchanger inlet. Follow the hose from the impeller up to the heat exchanger (see bottom photo). Pull off the hose and remove all particles before you start the engine!
3. Check the cover plate for wear (scoring). This reduces your pumps efficiency. Replace the cover plate if scored.

Install the New Pump.

1. Lubricate the new impeller pump with silicone grease or soak it in water.
2. Place the pump into the housing so that the vanes rotate in the same direction as before (you did check this, didn't you?). Replace the plug to hold the pump in place.
3. Install a new gasket or O-ring. Soak the gasket in solvent first to remove packing grease. Lubricate an O-ring with a light grease. Replace the outer cover.

You will keep your sailing boat's diesel engine roaring like a lion when you change your raw water impeller once each year. Follow these simple sailing tips above to add life to your engine and save money in expensive repair costs--wherever in the world you choose to cruise!

John Jamieson (Captain John) teaches sailing skippers the no-nonsense cruising skills they need beyond sailing school. Sign up for his highly popular FREE sailing tips newsletter at http://skippertips.com Become a member for instant access to 425+ articles, video tutorials, newsletters, and free eBooks.

Sail World NZ Lone WolfMackay BoatsRS Sailing 660x82

Related Articles

Antigua Marinas, Marine Services and related business ready for season
Over the last few weeks, the ABMA hosted a number of ‘State of the Industry Meetings’ to share and discuss information The pressure is on for Antigua to lead the charge for the region and ensure that all visiting yachts understand that not only Antigua but the region, is very much open for business and ready to deliver outstanding and unique Caribbean experiences, albeit with the option of changed itineraries for some in the short term.
Posted on 21 Oct
Tall ship loses power, hits multiple boats before grounding
Coast Guard Station Castle Hill is providing a safety zone in Newport Harbor, Rhode Island, Sunday night Coast Guard Station Castle Hill is providing a safety zone in Newport Harbor, Rhode Island, Sunday night after a tall ship lost power and hit multiple other boats before grounding near Perrotti Park. The SSV Oliver Hazard Perry, an educational tall ship homeported in Newport, was leaving Bowen's Wharf Seafood Festival with 12 crewmembers aboard when it lost power and began to drift.
Posted on 16 Oct
BoatUS “CAT” Team still hard at work
A month after Hurricane Irma struck Florida, the BoatUS Catastrophe (“CAT”) Field Team is still hard at work. A month after Hurricane Irma struck Florida, the BoatUS Catastrophe (“CAT”) Field Team is still hard at work. Here, in Marathon’s Boot Key Harbor, salvage crews from TowBoatUS Marathon raise a sunken sailboat and navigation hazard off the harbor bottom.
Posted on 12 Oct
Newport International Boat Show helping to aid the Caribbean Islands
Newport Int'l Boat Show announced that it committed $15,000 to organizations helping those affected by Hurricanes Irma Newport International Boat Show, announced today that it has committed $15,000 to various organizations helping to assist those in the Caribbean islands affected by Hurricanes Irma and Maria.
Posted on 12 Oct
Coast Guard Foundation salutes members of Coast Guard at annual dinner
US Coast Guard Band and the Coast Guard Academy Glee Club from New London, Connecticut will perform during the event. At the event, the Coast Guard Foundation will honor United States Coast Guard heroism and mission excellence with two awards, and acknowledge the response and rescue efforts of the service during the last three weeks of hurricane activity in Texas, Florida, Puerto Rico and the Caribbean.
Posted on 30 Sep
Auckland on the Water Boat Show gets underway in summer warmth
The Auckland On the Water Boat Show opened to more summery climes. After being lashed by a succession of gales and horizontal rain for the past few months, the Auckland On the Water Boat Show opened to more summery climes. The gates opened at 10.00am with the usual queue waiting to see three floors of exhibits in the Viaduct Events Centre before moving through the pavilion area
Posted on 28 Sep
Relief for Dominica
Our friends in Dominica were hit by Hurricane Maria on Monday evening, a category 5 storm on the Saffir-Simpson scale The Marine community through the Antigua and Barbuda Marine Association is working with Ondeck who is preparing its Farr 65 Spirit of Juno to head to Dominica late on Thursday evening to deliver much needed aid. They will then return a number of times over the coming weeks.
Posted on 20 Sep
Coast Guard Foundation activates Disaster Relief and Response Fund
The Coast Guard Foundation has been working tirelessly to help those affected by Hurricane Irma and Harvey The Coast Guard Foundation, a non-profit organization committed to the education and welfare of all Coast Guard members and their families, announced today the activation of its Disaster Relief and Response Fund to assist Coast Guard Members impacted by Hurricane Harvey.
Posted on 19 Sep
Tropical storm warning in effect
A Tropical Storm Warning means that tropical storm conditions are expected somewhere within warning area within 36 hours A Tropical Storm Warning is currently in effect for the area from Watch Hill, Rhode Island, to Hull, Massachusetts, including Block Island, Martha`s Vineyard, and Nantucket.
Posted on 19 Sep
Coast Guard readies for Jose, cautions mariners
Coast Guard units across the Northeast are accelerating preparations Monday ahead of forecasted tropical storm condition Coast Guard Air Station Cape Cod crews are flying storm tracks and using marine radios to warn offshore boaters of the approaching heavy weather and recommending they seek safe haven.
Posted on 19 Sep