1956 Johnson 10HO QD 19 exhaust housing temp

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Bob D
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Location: Staten Island NY

Re: 1956 Johnson 10HO QD 19 exhaust housing temp

Postby Bob D » Sat Jul 15, 2017 10:52 pm

Don thanks for looking around. The 2nd one would be perfect, but at 80 bucks delivered a bit much.
The Evinrude one I'm not sure about, as the guy lists it as a 68 with the right part number 377447, but no 10HPs were made that year?
After doing some research I am thinking this exhaust housing might have been a problem design, and the OMC engineer design staff fixed it after 1958, because the part number 377447 is a one year number only. This might have been a result when they lighten the 10HP by 7 pounds vs.the 1957 ?
Maybe Garry or Frank would know?

fleetwin
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Re: 1956 Johnson 10HO QD 19 exhaust housing temp

Postby fleetwin » Sun Jul 16, 2017 9:34 am

Well yes, this hsg is a one year only piece....But, this is only because of the lower motor cover change. 1958 was the only year of the 10hp/small g/c and exhaust hsg that used the aluminum clam shell hoods, later models all used the one piece lower motor cover and fiberglass hood. The change in the exhaust hsg is the mounting holes/flanges on top of the hsg for the different cover/hood design that occurred in 1959.
And yes, the seller is incorrect, that is surely not a 1968 10hp, no such thing.
Were there other problems with the 1958 exhaust hsg design? Not to my knowledge, but maybe Garry/Frank might know more. I do remember one other fellow having a problem similar to yours, but I think it was on a 10hp that was a 59 or newer model. I'm pretty sure the fix was adding a very small bleed hole at the top of the inlet water tube passage to spray the upper hsg with cool water....
This is an interesting topic for sure, would love to find the actual fault with the hsg...I will have to have another look at the hsg I have....
I would speak with the fellow with the Johnson hsg, I'm betting he is willing to accept much less, his asking price is ridiculous, he is just shooting for the moon.

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Bob D
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Re: 1956 Johnson 10HO QD 19 exhaust housing temp

Postby Bob D » Sun Jul 16, 2017 11:04 am

Don, picked up an 58 Evinrude exhaust housing for $25. Ok so it's blue........might just burn the paint off it anyway!
Stay tuned.

fleetwin
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Location: Rhode Island

Re: 1956 Johnson 10HO QD 19 exhaust housing temp

Postby fleetwin » Sun Jul 16, 2017 11:38 am

OK, still looking for you Bob...
I am very interested in this topic now....
The way I see it, either the exhaust hsg is defective causing this condition....Or, perhaps the powerhead has some sort of cooling relief in this area we are not aware of causing this strange symptom....I guess we will know real quick once you try a different exhaust hsg....
Sure wish I had the right one to give you in an effort to get to the bottom of this situation....

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opposedtwin
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Re: 1956 Johnson 10HO QD 19 exhaust housing temp

Postby opposedtwin » Sun Jul 16, 2017 12:59 pm

Aren't the FD and QD towers the same size? I thought the legs (including the gear case) were the same for these two models. If they are, I have one off a 1957 FD you can have for shipping.
Scott
"darkness has a hunger that's insatiable, and lightness has a call that's hard to hear"

fleetwin
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Location: Rhode Island

Re: 1956 Johnson 10HO QD 19 exhaust housing temp

Postby fleetwin » Sun Jul 16, 2017 1:18 pm

opposedtwin wrote:Aren't the FD and QD towers the same size? I thought the legs (including the gear case) were the same for these two models. If they are, I have one off a 1957 FD you can have for shipping.
Scott

Unfortunately, this is only true up to 1957. In 1958 OMC trimmed costs by adapting the small midsection/gearcase used on the 5.5/7.5 models to use on the 10hp...He is looking for a 1958 10hp midsection, which is a unique part to that year....


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