Topic: 3 hp yachtwin – Antique Outboard Motor Club,Inc

This topic has 12 replies, 6 voices, and was last updated 9 years, 8 months ago by 1957evinrude.

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September 11, 2015 at 2:28 pm #2501
1957evinrude
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I was running my yachtwin in a tank and I used a heat gun to check the temp on the right side of the cylinders it showed a temp of 230. That seems way to hot to me. The pump was pumping in small squirts but I think its normal for that engine?
Anyone ever checked the cylinder temps with heat gun?
September 11, 2015 at 2:40 pm #23633
cajuncook1
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September 11, 2015 at 2:52 pm #23634
1957evinrude
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Thanks Cajun. I need to check see if there is a clog somewhere and look at impleller etc.
September 11, 2015 at 3:43 pm #23638
seakaye12
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On a couple of my lightwins I decided to pull the exhaust cover and cylinder head in order to clean the various passages. Those passages are TINY! and it takes a bit of poking and probing just to figure out where all the openings are.

There is also a potential problem area where the water tube meets the powerhead; there’s a rubber grommet thing there with a 90 degree bend. All things you can check. See #12 on diagram.
September 11, 2015 at 3:45 pm #23639
cajuncook1
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Use your temp gun on the id plug as shown in the picture. The temps on the cylinder head cover and the exhaust cover are extremely hot. Yes those temps on the cylinder head(has some cooling) and especially on the exhaust cover can be greater than >200F
September 11, 2015 at 4:35 pm #23640
fleetwin
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quote 1957evinrude:

I was running my yachtwin in a tank and I used a heat gun to check the temp on the right side of the cylinders it showed a temp of 230. That seems way to hot to me. The pump was pumping in small squirts but I think its normal for that engine?
Anyone ever checked the cylinder temps with heat gun?

Are you sure you were checking on the "right side" of the cylinders, and not the exhaust cover?
September 11, 2015 at 10:27 pm #23653
garry-in-michigan
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Starboard is considered the ‘right’ side, and shows a green running light. The left side (facing the bow) is the port side and shows a red running light. The exhaust cover on that model will always show scorched paint
September 11, 2015 at 10:41 pm #23654
1957evinrude
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Yes I did check it on the starboard side. I will go through it and try to find the problem. Thanks guys !!
September 11, 2015 at 11:00 pm #23656
garry-in-michigan
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Sometimes the water tube will "hang up" on the water pump grommet, causing the water tube to bend into the drive shaft. This will eventually ware a hole in the tube letting water bypass the powerhead and go into the exhaust housing. It will still show some spray out of the tell tail outlet but the water to the powerhead is reduced. Replacing the water tube will entail pulling the powerhead.
September 12, 2015 at 1:19 am #23667
1957evinrude
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I will take a look at that also.
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