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An impeller pump provides cooling for the motor and requires little maintenance, the maintenance that is carried out on an impeller pump is to check the impeller annually and to replace it every 2 years is sufficient in terms of maintenance. Unfortunately, it is true that the water seal wears out over time, so that water is let through to the engine. Water in the motor is harmful, therefore there is a tell-tale hole between the water seal and the motor where water comes out if the seal is worn. If the water seal is not replaced quickly if these allow water to pass through, the pump shaft will corrode and eventually water will get to the crankcase oil. If water gets into the engine crankcase, change the engine oil to a mayonnaise color. An impeller pump usually has two water seals, a water seal and an oil seal. They are often identical but placed in reverse.

The red arrow indicates where the indicator goes, usually 4 in the circumference of the pump.

With the plan below I have fitted the impeller pump with a new water seal, bearing and shaft.

Step 1.

Close the sea cock and remove the cooling hoses from the pump.

Step 2.

Remove the impeller from the pump by removing the cover and removing the locking bolt, if necessary and with two screwdrivers or a pipe wrench you can remove the impeller.

Step 3.

Remove the pump from the motor.

Step 4.

Pull the shaft out of the housing and remove the old seals with a screwdriver.

Step 5.

Remove the slide bearing if it is necessary to replace it. the sleeve bearing is a canister that has been pressed into the pump housing, you can press this bearing out with an Allen screw and a piece of steel, see photos.

Press out bearing with tool.

Press in bearing with attachment.

Step 6.

Place the first seal with the open side down (the open side on the impeller sides). Carefully tap the seal with a pressure material into the pump housing until it stops.

Step 7.

Now press the second baffle into the pump housing (with the open side up) and make sure that it is flush with the pump housing.

Step 8.

Put the (new) drive shaft back into the pump housing, lubricate the shaft with some Vaseline to make this easier.

Step 9.

Replace the pump on the motor and reconnect the cooling hoses. Preferably use new stainless steel hose clamps.

Step 10.

Lubricate the pump housing with some Vaseline and place the new impeller in the pump housing and replace the cover with a new gasket. With large rigid impellers you can bind the blades together with a Tyrap.

If the impeller covers are worn, it is recommended to replace them. Grooving too deep in the cover will reduce the cooling capacity of the pump.

What do you need.

Seals. Item No. 833996 (2 times) For sale in the Web Shop of this site

As if it has been run in too much. Article no. 21951422, it is no longer made for this pump and I had it made. For sale in the Web Shop of this site.

Seals between pump and copper cooling pipe. Article No. 418411. For sale in the Web Shop of this site. Volvo Penta MD11 and MD17.

Seals between pump and copper cooling pipe. Article No. 829714. For sale in the Web Shop of this site. Volvo Penta MD5. Volvo Penta 2001, 2002, 2003

I have a complete repair set for various Volvo Penta engines. For sale in the Web Shop of this site.

Impeller pump cover. For sale in the Web Shop of this site

If you need a new impeller pump, you can find the right one for most marine engines via the link.