1150 Link & Sync Question

[jimmbo]

Using Starting Fluid on a 2 Stroke is asking for Trouble. First, Ether is very good at washing Oil off of the Bearings in the Crankcase, then there is the risk of igniting the Ether during Crankcase Compression

 

[jakec]

I knew it was not good due to the first reason but I had never thought of the second. Well I won't be doing it again in any case.

 

[merc850]

Here's the page on setting carbs

 

[jakec]

Thank you! I ordered 3 new floats because one of them had the exterior shell cracked.

 

[jakec]

Have not had time to rebuild the carbs yet. Disassembled the fuel pump and all parts look good, what I assume are one way valves/diagrams look good. I will be replacing all of the fuel lines for the carbs and fuel pump. There was new fuel lines already but they were not the outboard fuel line (just normal automotive). I was wondering if I should replace the vacuum lines as well (2 vertical hoses on block next to carbs). And if so, should I just use the same fuel line?

 

[jimmbo]

When you rebuild the Carbs, there is one Modification that you should do, see that black Hose running along the top of the Carb. Remove it from the Fuel Bowl Cover and Plug it with a small ball bearing. Doing that will disable the Auto-Leaning of the Carb's Metering System. It was added to the Carbs in the mid 1970s to reduce fuel consumption, and it does work, but today's Gasoline is far from what it was in the 70s, and combined with this feature, the Mixture is actually Too Lean using today's gas. The fitting on the Bowl Cover can be left open as it reverts to a normal Atmospheric Vent. This mod helps the engine live longer.

 

[jakec]

Thank you, I was going to do that but I didn't realize I should leave the bowl side open.

 

[jakec]

Unfortunately my main jets were in a state where I needed to use an extractor to remove them. They were size 072. Crowley's part diagram shows multiple sizes but the one they show at the top is 074. My engine number is 4698360.

CARB, USA-3761035/AUS.-8014005/CANADA-7025598 AND UP - 1977 Outboard 115 [ELPT] 1115627 | Crowley Marine

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www.crowleymarine.com

 

[jimmbo]

You can plug it but it doesn't make any difference as the bowl is still vented thru the Orifice just a bit more Starboard of the Hose fitting

 

[jimmbo]

This from my Mercury Service Manual

 

[jakec]

Wow thanks! I will get the 72's then.

 

[jakec]

I was doing reading about the fuel line size and people said the bigger the better and 3/8" is ideal. However in the store I looked at the 3/8" and it was visibly way too large. There was 5/16" on there originally which seemed appropriate. Just wondering if 5/16" is suggested for use with the 1150?

 

[jimmbo]

5/16" was used for all the engines until the V6s(175+hp) were introduced in the mid 70s, in which they got the 3/8" line. Unless you are running a 30' Line the 5/16" is more than adequate. Even at WOT, it will take approx 30 minutes to burn a 5 Gallon(6 US Gal) Tank. A 5/16" hose can syphon it faster than that

 

[jakec]

Thank you. did you see my earlier question about the vacuum (or pulse, I have seen it called) lines on the engine block, if I should replace them and if so are they also fuel hose or another type of hose?

I"m thinking of replacing them since they accessible right now.

 

[jimmbo]

Are you referring to the Oil Recirculation Lines? Mercury has those in their Parts Lists

J90TLEOR, E70ELEIE, MERCURY 115 (6 CYL.) - OEM Mercury Parts - iboats.com

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part 26

Cylinder Block And Crankcase Assembly - Mercury OEM Parts - iboats.com

Cylinder Block And Crankcase Assembly - Mercury OEM Parts - Since 1998, iboats is the most trusted water lifestyle online store for boat parts and accessories, boats for sale, and forums. Enjoy great priced products with fast shipping.

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[jakec]

I was talking about #28-30 in the same drawing, which runs directly next to the vertical fuel hose feeding the carbs.

 

[Chris1956]

Parts 28-30 are balance hoses, between the three reed blocks. Replace them is they leak are cracked or are otherwise worn out.

The pulse lines for the fuel pump have springs inside them to keep them from collapsing. They are tricky to route to avoid kinks. Maye sure that are clamped on both ends.

 

[jakec]

My lines do not have any springs in them because they've been replaced already. Here's a pic I took before disassembling everything, which shows that the line is somewhat kinked. Since I am replacing the lines should I purchase some springs at the hardware store? I looked at images online and it appears to be about 2" long. hope I can find something like that.

 

[jakec]

Also my balance lines seem to be in OK condition (rubber is not hard). But they are painted as is someone painted the block and left them installed.

 

[jimmbo]

They were likely painted at the Factory

I'm not sure what you are trying to show in the pic. I see a poorly installed Fuel Hose at the Pump Outlet. The Pressure/Suction Line for the Fuel Pump, a couple of yellow Wires with red stripes. And one small hose behind the Fuel Hose
Interesting Hex Bolt and Hex Shim holding the Fuel Pump on