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First find your year model and aquire a impeller kit as it will have all the replacment parts needed. To change the impeller you need to remove the lower unit. Put the motor into forward gear and remove the bolts/nuts holding the lower unit to midsection. Note that there is usually one bolt under the trim tab, usually it a total of 6 mounting bolts/nuts or less depending on year model. Once bolts/nuts are removed, the lower unit will drop down. The pump housing will be right on the top of unit with drive shaft protruding thru it. The pump housing is removed, then the impeller can be removed from the shaft. Retain the flat key and reinstall it with the new impeller,gaskets and wear plate. Lube the housing with some petroluem jelly or white grease, while pushing housing down turn driveshaft clockwise to seat the impeller in housing then torque nuts to 100 inch pounds. Reassembly is the reverse but make sure you line up the shift splines.
What else can I help you with?
How much does a 1983 40HP Mercury Outboard weigh?
The dry weight of a 1983 model, 40hp Mercury outboard, is 156lbs.
How often do you change lower unit oil in 40hp mercury?
It really depends on usage, but a good rule of thumb is once yearly.
What year is a 40hp mercury classic serial number OD228661?
0d161839
What is the oil to gas ratio for a 2005 2 cycle 40HP mercury?
50:1
How many cylinders does a 1993 40HP mercury outboard have?
I would say one per spark plug.
What is the spark plug gap for a 1995 40HP Mercury outboard 2 cylinder?
The plug gap for a 1995 model, 40 hp Mercury is .035 in.
What kind of oil do you use for a 2000 40hp mercury outboard engine?
Need to know if its 2 or 4 cycle.
What year is an outboard mercury 40hp serial number is 5897057?
A 40 hp Mercury outboard, serial number 5897057, would have been manufactured in late 1981.
What should the compression be on a 40 hp mercury?
I have a 1996 Mercury 4 cylinder 40hp with 125 Psi across all 4 cylinders. I also have a mid 80s Mariner/ Yamaha 40hp 2 cylinder with 123 Psi both cylinders. I'm not sure what factory specs are, but maybe this would help.
How do you rebuild a lower unit on a 40hp mercury outboard?
To rebuild a lower unit on a 40hp Mercury outboard, start by removing the lower unit from the engine by unscrewing the bolts and disconnecting the shift linkage. Drain the gear oil and disassemble the lower unit, noting the arrangement of parts. Replace worn components such as seals, bearings, and the water pump, then reassemble the unit, ensuring all parts are properly aligned. Finally, refill with the appropriate gear oil and reinstall the lower unit on the outboard.
What year is this mercury outboard 40hp serial 2877503 need a prop?
To determine the year of a Mercury 40hp outboard motor with the serial number 2877503, you can refer to Mercury's serial number lookup charts, which typically indicate that this serial number corresponds to a model from the mid-1980s. Specifically, it is likely from around 1986. For the correct propeller size and pitch, you should consider the specific application and boat specifications, as well as consulting a marine professional for recommendations.
How much does a 40hp 2005 mercury outboard weigh?
The dry weight of the Mercury outboard FourStroke 40 HP boat motor released in 2005 is approximately 250 pounds. Later versions of this motor are slightly lighter.
