How do I know if my MerCruiser water pump is working?

Pull the hose that feeds water to the engine. If water is flowing there the fresh water pump is working. If it isn’t you either have a clogged intake or a bad pump. A bad thermostat (stuck closed) shouldn’t be the problem because there’s a bypass on it that allows water to pass to the exhaust.

How often should you replace the raw water pump in your boat?

Impellers: Most manufacturers recommend every year. They typically last longer. It’s probably a good idea to do it every two years. If you try to stretch it to three, they will take a set during lay-up and will probably start throwing vanes.

How do you test a raw water pump?

Hook up the fake-a-lake, disconnect the water line to the raw water pump. Make sure water goes through there. Hook the line back up, disconnect from the trans cooler, make sure water comes out there. You should have seen a bit more pressure coming from the output of the raw water pump.

Does a MerCruiser have a water pump?

The MerCruiser outdrive, or sterndrive, motor has been used on marine watercraft for decades. Like all marine engines, the MerCruiser relies heavily on its water pump impeller to send outside water through the engine manifold, jackets and passage to keep it cool.

How do I know if my inboard boat water pump is bad?

Signs of a bad boat impeller are either boat engine overheats when you try to accelerate, loss in impeller vanes flexibility, physical wear & tear like cracks in impeller vane roots, melted or worn of vanes. Even if you see less or no water coming out of tell-tale, it might be due to a bad impeller.

How do I know if my boat water pump is bad?

A bad outboard water pump will produce lower water pressure than normal. The outboard can stop pumping water out the tell-tale, begin to overheat, restrict the available RPM allowed, and cause significant damage if not corrected.

How often replace water pump impeller?

It’s good outboard maintenance practice to check your water pump impeller every season, and replace it every two to three seasons. 300 hours of use or every 3 years whichever comes first!

How do you change a raw water pump?

Replacement is relatively simple. For raw water pump applications, first close the water intake thru hull valve. Then, remove the pump’s end cover screws and take off the cover and gasket. Take the old impeller out by gripping the hub of the impeller using channel lock or needle-nosed pliers.

How often should you change water pump impeller?

Mercury recommends changing the impeller every 300 hours…its in the owners manual. It’s an easy enough job to do yourself if you have some mechanical skills.

What causes an inboard motor to overheat?

Worn or damaged water pump/impeller, clogged passages, cracked/kinked hoses, among other things can easily create an overheat condition, which is one of the deadliest conditions a motor can face. There are two types of cooling systems commonly found on inboard/outboard boat motors.

What would cause a boat engine to overheat?

Overheating can also be caused by a worn or damaged water pump impeller. Any debris left in the water passages may reduce flow, which leads to persistent overheating. When a new impeller is installed, run the engine or related system as soon as possible to ensure proper operation, as I learned from experience.

Where to replace your MerCruiser marine engine sea water pump?

Replacing Your Mercruiser Marine Engine Sea Water Pump Impel – YouTube Performance Product Technologies website http://www.perfprotech.com is one of the Top Rated online Mercury Mercruiser Parts dealers. PPT handles a variety of…

Is the new MerCruiser water pump bi-directional?

This new design water pump is bi-directional and fits both steel and composite timing chain covers on all small block V8 engines. Does not fit aluminum timing covers on 2008 and newer 4.3 V6 engines. Fits all 4.3 V6 engines with plastic or steel timing cover, 2007 and older. Fits all years and all makes of 5.0 and 5.7 marine V8 engines

Which is impeller for brass sea water pump?

Impeller Kit for Brass Sea Water Pump Mercruiser 47-8M0104229 Fits 2000 & Newer MCM V-6 & V-8 (305, 350, & 496 cid) engines with the brass sea water pump Replaces: GLM 89700 Mallory 9-45310 Sierra 18-3016-1 Mercruiser… Sierra 18-3016-1 Impeller Kit For Use On Late-Model Bravos & High Performances.

How long does it take for MerCruiser water pump to ship?

1 in stock. 5 in stock. 2 in stock. 6 in stock. Available to order: Usually ships within 10 days. 10+ in stock. 10+ in stock. Available to order: Usually ships within 10 days. 10+ in stock. 4 in stock. Available to order: Usually ships within 10 days.