How do I change the impellor or water pump on a 1970 40 HP Johnson outboard motor?

Question

How do I change the impellor or water pump on a 1970 40 HP Johnson outboard motor?

Answer 1

If you don't already know how to do this process correctly, you need to buy the service manual for it.

This is not a very overly lengthy task to do, but it is essential you follow directions 100%.  All parts must be put in exact order, there are no shortcuts to this work.

Depsite other people's suggestions, doing this blind without a manual or previous successful experience for this is an ivitation for a improper installation.  That means expensive repair bills down the line.

If you have the manual, patience, mechanical aptitude, and the tools, go for it.  Otherwise, take it to a dependable outboard service shop that works on Johnson outboards and have them do it.

Answer 2

take havoc's advice, the manual will more than pay for itself on this operation alone.  too many details and year-to-year model variations for a person to remember & type 'em all out here.

run into any specific questions or ambiguous instructions in the manual after you get started, just ask.

Answer 3

1st you should have the manuel but if you dont and feel like trying it you have to remove the lower unit when you remove it it sits under a cap  remove that and just keep removing things and put it back the same way its easy but do it with someone watching or helping you