1956 30hp info please

[Birdup]

I just bought a 1956 30hp model# 25022. I was told by the previous owner that I need a two line tank. What is that?<br /><br />Also, is he right on the year and HP? <br /><br />Is there any problems with this size and modle that I should be aware of? <br /><br />I like the older motors and it has good compression,110. So It should make a good little engine.

 

[Paul Moir]

Re: 1956 30hp info please

Sounds like it's in great shape!<br />He's correct, it's a '56 30hp:<br />Evinrude Model 25022<br />Year: 1956<br />HP: 30<br />WOT RPMS: 4500<br />Displacement: 35.7 cu.in.<br />Cylinders: 2<br />Weight: 113 - 130 lbs. (electric start and longshaft add weight)<br />Gear ratio: 12:21<br />Spark plugs: Champion J6C gapped at .030" (J6J is NLA)<br />Fuel/Oil mix: 24:1 87 octane gas to TC-W3 rated outboard oil.<br />Lower unit oil: OMC/BRP "HiVis" or other 90 weight outboard gearcase oil.<br /> '56 Evinrude Brochure <br />From the Old OMC Site <br /><br />The 2-line tank system worked by pushing air into the tank from the crankcase, which pressurized the fuel tank. That pressure in turn pushed fuel up to the carb. It was replaced a few years later with the more common single line system that employs a fuel pump to suck gas out of the tank.<br />Generally speaking, it's simpler and less expensive to purchase an old 2-line pressure tank from ebay and fix it up than to convert it to a later style system. The following ebay search terms will turn up most of them:<br />(double line, pressure, two line) tank (omc, johnson, evinrude)<br /><br />The most common problem with these era engines revolve around the ignition system. Fortunatly, parts are cheap and easily available. A healthy ignition system will produce sparks over 1/4" long.<br />Also, plan on a carb and water pump rebuild before putting it into service.

 

[RobG]

Re: 1956 30hp info please

Originally posted by Birdup:<br /> I just bought a 1956 30hp model# 25022. I was told by the previous owner that I need a two line tank. What is that?<br /><br />Also, is he right on the year and HP? <br /><br />Is there any problems with this size and modle that I should be aware of? <br /><br />I like the older motors and it has good compression,110. So It should make a good little engine.

I have a 1958 Johnson 10-hp that uses the two line gas tank. The engine forces air into the pressurized tank and the return line sends the fuel back into the carb. You can adapt your motor by using a briggs and stratton plastic fuel pump and then use the standard 1 line with the fuel primer bulb. I can email you the part number of the b&s fuel pump later. It runs about 25.00. The pressurized tanks are hard to find and you can't make one that's reliable for long term use.

 

[Birdup]

Re: 1956 30hp info please

Thanks Paul.<br /><br />Great info as always. I already have three tanks for the 68 that I have so I might want to look into converting it. Is it a hard process?<br /><br />I also have an electric strarter on my 68 20hp. Will that work on the 56 30hp?

 

[Paul Moir]

Re: 1956 30hp info please

Not hard at all, if you're good with tools or scrounging. Basically, you mount up a 64 or later large pump to one of the bypass covers - just like your 18hp. Naturally the cover will need to be drilled and tapped to fit it. Alternatively, you can simply find an old 60's 40 or 33hp bypass cover with the pump already attached, and bolt it on. RodG has the method, but I think the Briggs fuel pump may be too small for your engine. Not a bad idea for smaller engines though. <br />You must plug up the old pressure line, and mount a new style fuel fitting for the tank's line.<br /><br />It seems to me that the electric starter for the 18hp is different for the 30hp. Does the 30 have a toothed flywheel, and an electric starter bracket already in place?

 

[Birdup]

Re: 1956 30hp info please

When you say the cover what do you mean? My pump on my 20hp is mounted on the shifter side to the block if I remember right.<br /><br />I don't remember if the flywheel is toothed but I will check. I actually have a 1968 20hp not a 18hp will that make a difference in the starter.

 

[Chinewalker]

Re: 1956 30hp info please

RobG,<br /> I must disagree with your assessment that the pressure tanks can't be made reliable for long term use. I've been using pressure tanks for many years with very few problems. Rebuild kits are readily available for them and it is a very reliable system, at least as reliable as the fuel pump system. As with either system, some maintenance and occasional part replacement may be necessary to assure continued reliability.<br /> For pressure tank rebuild kits, see www.vintageoutboard.com...<br />- Scott

 

[Paul Moir]

Re: 1956 30hp info please

Yeah, the bypass covers are on the other side of the 18hp. But like the later fuel pump equipped outboards it's mounted to the intake bypass cover. The fuel pump is larger than the 18hp one though.<br /><br />I am mistaken - the 18hp starter will fit a 30hp. But like I said, you'll need an 28/30/33/35/40hp starter bracket and flywheel with teeth to fit it. The post'56 flywheels were a little different:<br /> Discussion, click here.

 

[cajun555]

Re: 1956 30hp info please

Hey Paul, According to my manual max rpm is 4000 on the 30 hp.

 

[RobG]

Re: 1956 30hp info please

Chinewalker,<br /><br />Most people I know of have tried taking the plastic Tempo tanks and drilling them to place another fitting on them, next thing you know you've go gas fumes and possibly spewing going on. I'm sure experienced mariners have come up with good tanks. If anyone is interested the number to the Briggs & Stratton fuel pump is 808656, I am using this pump on my 1958 QD-19 10 HP Johnson for about 8 years now and regular plastic 6 gallon tanks. The fuel pump is also a great replacement for people with 4 wheelers. My suzuki quadrunner fuel pump was 86.00 dollars, the B&S pump (made by Mikuni) is 25.00.<br /><br />Happy fishing!<br /><br />Capt Rob

 

[Paul Moir]

Re: 1956 30hp info please

cajun555: You know, 4000rpm is what's written in my manual, but the brochure (Click here) clearly states 4000-5000 RPM. I've always seen with a rated HP at the center of it's range for these old J/E engines. Like the smaller outboards that are rated for 3500-4500 with a rated RPM of 4000.

 

[Birdup]

Re: 1956 30hp info please

Does anyone know if this 1956 30hp model# 25022 is called the "Lark". Or is that a different model?

 

[RobG]

Re: 1956 30hp info please

Birdup,<br /><br />You might be able to find the info at this website:http://www.old-omc.de/, he has a good collection of omc brochures online, at the moment I noticed his link might be getting updated or changing servers.<br /><br />Rob

 

[Paul Moir]

Re: 1956 30hp info please

The way I understand it is that the 'Lark' that year was a featured-out BigTwin with an different cowl:<br />25022 - "Big Twin", Manual start, Short shaft<br />25023 - "Big Twin", Manual Start, Long shaft<br />25526 - "Lark Styling", Electric Start, Short shaft<br />25527 - "Lark Styling", Electric Start, Long shaft<br />25924 - "Big Twin", Electric Start, Short shaft<br />25925 - "Big Twin", Electric Start, Long shaft