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1957 Ranger IV, Evinrude 30hp Lark 06 Jul 2023 05:33 #126094

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Boatboy 

you bet!! One on each machine face sandwiching exhaust baffle plate.

I ran motor tonight pulled powerhead and re-install this morning before it’s was to hot. Took that flat plate out I made for exhaust loading tube assembly.. let RTV sealant set on bolts..

anyways I see not much difference in temps on cylinder/heads.. I may have got to excited when I took temps I was hitting bottom of spark plug and for some reason 1 plug is 20deg C higher than the other and noticeable visually. (Ignition problem or bad plug?? No idea atm)
Heads are running mid 50 deg at idle.. going to runner like she was supposed to. I’ll keep an eye on it.
 I won’t be pulling powerhead to put exhaust plate in until I’m in there again. Noticeably more water exiting leg with it, and a touch quieter with it. Would be nice to actually see what the early 50’s had for exhaust loading assembly the parts book doesn’t justify it and nothing on the web for a visual. A plate with two tubes haha.. is one shorter or different shape who knows.. it ran great without it that’s all I know

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1957 Ranger IV, 1956 Evinrude 30HP
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1957 Ranger IV, Evinrude 30hp Lark 06 Jul 2023 03:00 #126093

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My parts book shows two gaskets with the baffle plate on the left sandwiched between them.
John

1958 Vagabond II & 35 HP Evinrude
1955 PlastiCraft 12 Ft. Delux Runabout
1957 Clipper & twin 35 HP Evinrudes
1957 AlumaCraft 14 Ft. FD

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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 21:35 #126087

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Yes baffle plate that was torn I took out of motor and replaced with new one. Everything matches up just older one would’ve had larger exhaust space.
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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 20:57 #126085

So. Was the baffle plate that is cut out the one that was on the engine when you got it?
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- Poor Richard’s Almanack, 1737

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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 17:54 #126084

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Well looking like I may have a crack? Gasket problem? Looks like hole for bolt goes right through to water circulation not sure if that’s factory or if there’s a chunk missing from aluminum..




im just going to add to this post… I was completely wrong and the threaded hole in powerhead is common to water cooling system. Compared..
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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 17:29 #126083

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I’ll mark these up Ray if you want [attachment=49034]IMG_6955.jpeg[/attachmen
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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 16:57 #126082

What’s the highest temp we want to see on these cylinders ?







160F max, 70C max
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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 11:01 #126080

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What’s the highest temp we want to see on these cylinders ?
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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 02:37 #126079

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Thx Ray!! Ya disappointed for sure. Powerhead isn’t horrible to remove but getting old knowing the wide open water awaits..
im sure when I got running last year you/I spoke on temps and they were even around 57deg C..
only thing I did was add blank plate and replaced exhaust baffle plate that was torn..
im sure impeller is ok as it’s very new with couple trips and really from viewing under powerhead I was concerned of this issue.. the correct part isn’t available and maybe that’s exactly why it was missing 
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1957 Ranger IV, Evinrude 30hp Lark 05 Jul 2023 02:08 #126078

80C is too hot, 60C sounds good.
I would have expected both cylinders to heat up if it was the exhaust but I have not seen enough to know anything about how everything is routed.
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