Topic: Mercury 10A – Antique Outboard Motor Club,Inc

This topic has 12 replies, 9 voices, and was last updated 3 years, 2 months ago by Pondrocket.

Viewing 10 posts - 1 through 10 (of 13 total)

1 2 →

Author

Posts
January 13, 2023 at 6:23 pm #271127
scubapop
Participant
US Member
Anyone ever replace the water pump 0n a Mercury 10A. I could sure use some advice for this job. Recently acquired this little guy and want to be sure that it has a adequate cooling. Any help or advice will be greatly appreciated.
January 13, 2023 at 8:17 pm #271130
DAVID
Participant
US Member
pain in the !!! and time consuming but can be done if you follow the directions. get the manual!
January 14, 2023 at 6:39 am #271136
billw
Participant
US Member
When you do it, you get a master’s degree in water pump replacement. And patience. It is best if you have some special tools. Some guys have made their own, although I am not recommending that. Any short cut you try to take will end up biting you in the rear end; believe me. Like Dave said, get the manual, too. I own around thirty Mercury engines with this type of pump/transmission set up. The SHORTEST time I ever spent on one was nine hours, to truly do it right. But don’t let all this negativity bring you down. When they are right, they run well and are a pleasure to use. The unique transmission is something everybody in this hobby should experience. Don’t be afraid to ask more specific questions, if and when you proceed.

Long live American manufacturing!
January 14, 2023 at 11:21 am #271145
DAN UMBARGER
Participant
US Member
May I ask what a Mercury 10A is? I don’t think I’ve ever heard of that model.
January 14, 2023 at 11:46 am #271154
DAVID
Participant
US Member
1959-mark 10 A is a mercury auto tranny. shift and throttle in the tiller handle.
- This reply was modified 3 years, 2 months ago by DAVID.
January 14, 2023 at 12:26 pm #271168
frankr
Participant
I did 3 of them. The first and the last and the one I had to do over when it quit pumping after just sitting on the rack. Had no instructions and made my own tools. Some Merc dealers wouldn’t even touch them.

I have to admit, they were an engineering marvel.
- This reply was modified 3 years, 2 months ago by frankr.
January 14, 2023 at 3:32 pm #271178
DAVID
Participant
US Member
Ran a Mark 28A on a 12ft Aristocraft and loved it. ran a long time and traveled many miles in the Chesapeake Bay on a few weekends. Was not afraid of break downs.
January 14, 2023 at 5:03 pm #271179
Matthew Pieklik
Participant
US Member
When I started to work on my mark 28 that was on my rack for about 15 years, I did the water pump and found the locating pin for the impeller cup was missing. The special tools I picked up at auction and at the time, I had no idea what they were for. Read the service manual and take your time pay attention to the springs and pawls . I had success and so will you.
January 14, 2023 at 8:13 pm #271184
ROBERT LAFAYETTE
Participant
US MEMBER PAY BY CHECK
A couple good videos on YouTube

https://youtu.be/lB4fkM0wvPk
January 14, 2023 at 9:33 pm #271185
Bob Wight
Participant
US Member
I’d always heard changing the impeller on one of these was a real PITA. Now I’m fully convinced. Somebody must have stayed up a lot of late nights to come up with this design! But then again, I’ve heard they were great runners.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
Author

Posts