water leak in engine

[Carlasdaddy]

I have acquired a 1956 Evinrude 7.5hp power head attached to a 1958 lower unit. I removed the power head to dis-connect shift rod and replaced the impeller in lower unit. I re-attached the power head with a new gasket and torqued attaching screws to specs. When I started it up in a barrel of water, water started coming out between the power head and lower unit. Any ideas what is wrong? Should I have used a gasket sealant on the new gasket?

• This topic was modified 4 years, 4 months ago by Carlasdaddy.

[crosbyman]

did you use the proper gasket…. they have different designs based on year I do not think sealant is needed to mate the 2 surfaces

you need 18-3001C gasket on a 1956 to 1958

https://www.vintageoutboard.com/collections/johnson-evinrude-water-pumps-impellers-lower-units

check the design pattern on the new… lower unit

Joining AOMCI has priviledges 🙂

[frankr]

This same question keeps popping up. So, have you checked the core plug in the bottom of the head or not?

[Carlasdaddy]

Yes, I used the proper gasket.

[Carlasdaddy]

Do you have a picture or diagram of where the plug is located?

[Mumbles]

There’s two of them in the head. Top and bottom.

[frankr]

Mumbles, aren’t there three of them? Two shown in your pix plus one on the bottom, straight down from the top one?

[frankr]

Item #47. Sez 3

• This reply was modified 4 years, 4 months ago by frankr.
• This reply was modified 4 years, 4 months ago by frankr.

[Carlasdaddy]

You found the problem for me. I removed the power head and found that the welch plug facing straight down was missing. Now the problem is where can I get one. Not available on eBay and Marineengine.com only carries parts back to 1957. Do you know where I can buy it?

[Mumbles]

frankr wrote:

Mumbles, aren’t there three of them? Two shown in your pix plus one on the bottom, straight down from the top one?

Yup but my ’56 diagram only showed the two. I should know better than that.

[Author]

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