rude 7.5 what year?

[ISLANDS19]

number 7516-90217, what year?<br />i think it is about 1957<br />is this a good idea to buy an so old motor?

 

[Chinewalker]

Re: rude 7.5 what year?

Hi Islands19,<br /> Your motor is a 1954 model. If you have the original dual line tank for it you are ahead of the curve a bit.<br /> As for whether or not it's a "good idea", well, only you can decide that. On the whole, if the motor has been well taken care of, and if you're willing to do several things right off the bat, then yes, it can be a good running little motor that will serve you well. If the motor has been abused, improperly maintained, or is otherwise in poor shape, then it likely isn't worth the energy and money to get it going again. <br /> First things to do would include a compression test, a check of the lower unit oil, and a look under the flwheel for condition of the coils. Pretty much all of the basic service parts are available for that motor, including waterpump impellers, coils, points, condensers, carburetor kits, tank rebuild kits, hoses, and spark plugs. You can likely replace all of the basics for around $100 if you do the labor yourself. When you're done you should have a sweet running old motor that performs nicely, runs quietly, and draws some great attention at the boat ramp.<br /> I have a 1955 version of the same motor and really love the oldster. It's relatively easy to work on, and frankly hasn't needed much in the four years since I built it up from a couple of parts motors.<br /> Keep in mind that your motor will need a minimum of a 24:1 fuel mixture, and could probably use a good decarboning to get rid of the excess carbon that is common to older motors that need the rich oil mix. The original mixture was 16:1 using essentially automotive oil and wasn't known for clean burning. The newer oils burn much cleaner, plus they lubricate better which allows a leaner 24:1 mix - but don't go any leaner than that!<br />- Scott

 

[ISLANDS19]

Re: rude 7.5 what year?

Thank you very much for your knowledge<br />he guy who sell it told me it run well...<br />he ask 150$ (can) (about 110$ us) for it with the tank. What do you think about that deal?

 

[Paul Moir]

Re: rude 7.5 what year?

Islands19: $150 for a good running engine is always a deal. The 2 line pressurized tank alone is worth $50 to the right people.<br />If you have any mechanical abilities at all, get yourself a manual for that engine. It's worth every penny.

 

[ISLANDS19]

Re: rude 7.5 what year?

Thank you Paul, by the way, I plan to explore the samll bays of Nova Scotia with my 19 foot sailboat during next summers. I presently own a 4hp '76 rude that run very well, but itry it in Miramichi bay N.B., and found the motor was weak a little bit to beat tidal currents and winds of seashore. I think 4 hp woul be enough for a lake, but not for the sea! that is why i am looking for a 7 to 8 hp. If you live in Nova Scotia, maybe you can give me your advice about the proper size of motor for a 19 ft sailboat weighting about 1000 pounds empty, and can have 8 persons aboard

 

[Chinewalker]

Re: rude 7.5 what year?

Hi Islands19,<br /> One thing to keep in mind - for sailboat use most require a long-shaft motor, which translates into 20-inches from the flat of the clamps to the flat of the cavitation plate above the propeller. My experience is that VERY few of the old 7.5s had long shaft kits installed, and finding a kit to convert one would be difficult and pricey. If your existing 4hp isn't a longshaft, then this might not be an issue for your particular sailboat...<br />- Scott

 

[Paul Moir]

Re: rude 7.5 what year?

I don't have a lot of experience sailing, but last year my brother bought a Shark 24' and I've helped him run up and down the coast a few times (to Petpeswick inlet from Halifax harbour). The Shark is only 2000lbs, and is basically a canoe. It has little freeboard and little beam (mabey 4' 6"). We push that around with an old 4hp mercury, and that gets us 4.5 knots normally. The boat is designed to take a 4 to 6hp engine. Try to find what your boat is rated for.<br />The last time I came back, we were becalmed but hit by waves from hurricane Fabian, including a couple of freaks that still give me nightmares. One of the lessons learned (other than don't go out when there's a hurricane _anywhere_ in the Atlantic, especially if your in a lake boat) is to get the engine's prop as deep into the water as possible. The merc has a 20" shaft (measured from transom bracket to anti-ventilation plate) and sits on a jackplate. When pitching on the seas, the propeller comes high in the water since it's so far off the back of the boat. To save the engine from over-revving, we had to run at half-throttle (mabey 3.5knts). So make sure the propeller is good and deep. And reliable. Then worry about power. Remeber, getting your hull above 6 knots is just about impossible with any outboard.<br /><br />Petpeswick is the only navigable harbour between Ships harbour and Halifax I think. My grandparents own the yellow cabin on the island. You'll see it if you ever get in there. Speaking of which, whatever you do, don't follow the charts for the inner part of that inlet! The channel is not were it's indicated! Between the bouys is really deep even at low tide.<br /><br />EDIT: Thanks Chinewalker - that reminded me. The Shark is designed to take a 15" engine, so I raised our 20" one 3" so it would clear the water well when raised and racing. Having it 2" deeper than designed was insufficent for a ~6" setback.<br /><br />Shark 24 Information

 

[ISLANDS19]

Re: rude 7.5 what year?

I have an outboard bracket (chair), so i don't absolutely need a long shaft, in fact it prevent the motor to take too much space in the cockpit when sailing. About the speed, it is shur that the hull speed is somewhere around 6 knt, but the worst thing i had to do was passing trough narrows slaloming channels with heavy wind that make the boat so slow, it became unsteerable. I think tha 7.5 hp can give me more power against wind than 4hp.<br />Something i am scared about is the price of the coils for this old motor, beceause, at 50 years old, iam neraly shure the will need replacement, an it is near 100$ (can) each!

 

[ISLANDS19]

Re: rude 7.5 what year?

Does the number 7513-90217 can tell us if it is a long or short shaft?

 

[Paul Moir]

Re: rude 7.5 what year?

Islands19 - You need to shop around. I was looking for a set for my old engines (same coils). The local Johnny/Rude shop wanted $40+HST each for them. The best I could find online in Canada was $30 each + shipping. Then I did some checking around the 'States. I found them for $12.50 (now 15$) each from www.go2marine.com, Sierra (aftermarket) part number 18-5181. They charge a lot for shipping, but I got the pair at my door for under $50CDN. Which they don't put HST/Duty on at the boarder.<br />Carquest Autoparts _may_ also carry it (same part#), but UAP/NAPA's don't (they do in the 'states).<br /><br />If I were you, I'd have both engines on board. I see what you mean with the wind though, so I'd have the 7.5 rigged. The Petpeswick narrows (about 50') has a very strong current, but I've never tried tackling it in heavy winds. Of course it's a gas going through it with the wind and tide (the shark is a semi-planing hull. Going +10knots on a boat that size is fun.)<br />Don't get me wrong, the Shark is underpowered. But it's used for racing/day-sailing, not cruising.

 

[Paul Moir]

Re: rude 7.5 what year?

No, it's an add-on kit. 7513 is a 1953 engine, by the way.<br />Measure from the part of the bracket that rests on the transom (or chair) to the horizontal plate just above the propeller. If it's under 20" it's a short-shaft, and if it's over it's longer. Usually a 15" motor will measure 15" here, but some of the older Johnny/Rudes were more like 18" here.

 

[ISLANDS19]

Re: rude 7.5 what year?

Thank you very much everybody, your advices have been of great interrest.<br />Pat

 

[ISLANDS19]

Re: rude 7.5 what year?

Oops, a new question come to my brain1<br />The manual i found on this site begi at 1956 does it apply to a 1953 or 54 rude? And many peoples told me there is often a trouble with the fuel(air)pump and tha it my cost about 90$(can) to get te right parts, what do you think about this?<br />thank,s