The search for a reliable engine for a boat often leads the future owner to the dilemma: overpay for new equipment or take a risk and make a decision. Buy a 40 hp outboard motor bpd40 horsepower is a kind of “golden mean” in the world of boating technology. On the one hand, it is already a full-fledged traction, allowing you to confidently plane heavy PVC boats up to 4 meters long and small aluminum boats. On the other hand, such engines often do not require registration in GIMS (if the total weight with the boat does not exceed the threshold, depending on the year of production and the type of boat), which greatly simplifies life for aquetromotorists.
The market of used equipment today is saturated with offers, but it is becoming more and more difficult to find a really high-quality instance. Yamaha, Mercury, Tohatsu, Suzuki The brands are well known, but the history of each unit is unique. Many beginners make the mistake of buying a cat in a bag exclusively at a low price, forgetting that the repair of modern equipment is not a good idea. two-stroke or four-stroke The cost of a refurbished engine can be 70-80% of its cost, and in this article we will discuss in detail what to look for when inspecting, how to distinguish a refurbished engine from the original, and whether it is worthwhile to connect with the used segment in the current economic realities.
Now, you have to understand that 40 forces is not just a wind blower for quiet fishing, but a serious propulsion system. piston-groupBuying used equipment requires a cool head, the tools to check and, preferably, an experienced companion, and we have a structured guide that will help you minimize risks and make an informed decision.
Two-stroke or four-stroke: what to choose on the secondary?
The first and most important question that confronts the buyer is the choice between the two. 2T and 4T In the 40 hp segment, this dilemma is particularly acute, as both types have their advantages and disadvantages, especially in the context of hand-held purchase. Two-stroke engines are traditionally lighter, easier to maintain and cheaper to repair, making them favorites among those who value mobility and simplicity of construction. Four-strokes, in turn, are quieter, more economical and more environmentally friendly, but more complex and heavier.
When buying a b/w two-stroke The key is the condition of the cylinders and piston rings, which tend to have lower resources, but the cost of recovery is often affordable for the owner. If you plan to travel long distances a lot, the consumption of a mixture of gasoline and oil can be a nasty surprise to the budget.
Four-stroke The presence of an oil crankcase, a valve mechanism and a more complex lubrication system means that any negligence of the previous owner (for example, driving with low oil levels or roll) could lead to serious damage. kneel Checking the oil for an emulsion (a sign of water getting in) is critical here.
⚠️ Warning: When buying a 4T engine, be sure to check the color of the oil, if it is a coffee with milk or a gray emulsion, the engine has bathed, a sure sign of corrosion inside the engine, even if it looks perfect on the outside.
For clarity, we compare the key parameters of both types of engines in the context of the used market:
| Parameter | two-stroke (2T) | four-stroke (4T) |
|---|---|---|
| Weight (approximate) | 45-55 kg | 65-75 kg |
| Resource to overhaul | 1500-2000 motor-hours | 2500-3500 motor hours |
| Fuel consumption | Tall (mixture with butter) | Low (clean gasoline) |
| Difficulty of repair | Low (can be repaired in the garage) | High (qualification required) |
The choice also depends on the type of boat, and for a lightweight inflatable boat that needs to be carried around often by hand. 2T It's preferable because of the weight, and for a stationary boat or a heavy boat with a hard bottom, PVC is better suited. 4TIt provides comfort and silence.
Visual inspection: looking for traces of exploitation and hidden defects
The first thing that catches your eye when you meet a salesman is the appearance of the unit. cosmetic It's a simple thing to do in a motor, and anyone can paint the casing and replace the stickers. You have to look deeper. Start with a lower unit (legs). There are dents, especially at the front edge, that can indicate impacts on rocks or the bottom. Even small dents can disrupt hydrodynamics and lead to cavitation.
Notice the mounting bolts. If the bolt hats are stained with paint or if you see fresh scratches from the key, it's a signal that the engine has been opened. The only question is, was there a planned maintenance or an attempt to fix a serious breakdown? tranny Traces of braces or metal deformation indicate that the motor was placed on a boat with an inappropriate height of the transom, or too tightly tightened to compensate for the backlashes.
Check lower unit for traces of oil. Dedwood oil leaks are a common problem in used equipment. Also check the condition of the anti-cavitation stove. If it's heavily corroded or has traces of deep processing, it means that the motor often worked in sand or shallow water, which is detrimental to the body. impeller (dips) pumps.
Pay special attention to the condition of the lower unit pipe. Run your hand around the inside if you have access. Deep furrows or rust is a bad sign. Also check the integrity of the rubber elements: anthers, cuffs. Rubber eventually dries up, and if the seller changed them recently, it's a plus on the one hand, and on the other, it's an excuse to ask what exactly broke before that.
Take a powerful magnet with you to see it, run it through the lower gearbox, and if the magnet sticks very hard to large areas, it's possible that there's an active breakdown of the gears inside the gearbox, and the metal shavings settle on the walls.
Technical check: compression, spark and thermostat
The look is good, but the heart of the engine is hidden inside, and if the seller allows (and the normal seller always allows if he has nothing to hide), you need to conduct a technical diagnostic. 2T engines The main parameter is compression. The normal indicator for a 40-horsepower engine is the pressure in the cylinders from 8 to 10 atmospheres. The scatter between the cylinders should not exceed 1 atmosphere.
Checking the compression 4T engines It's also important, but you have to be careful. Too low compression can indicate wear on the piston group or problems with the valves. However, if the compression is normal, it's not a guarantee of engine health. Be sure to check the ignition system. Unwrapped candles: their color tells a lot about the engine. Black plaque is a rich mixture or oil problems, white is a poor mixture or overheating, brown or brick is the norm.
The most important step is to test on water or at least on a barrel, and it is strictly forbidden to start the engine "dry" even for a few seconds, it is guaranteed to kill. impeller If you can't check on a barrel, ask the seller to show you a video of the engine running under load or in water. Notice the jet of water from the control hole: it must be strong and flat. A weak jet indicates that the pump is wearing out or the cooling system is clogging.
⚠️ Warning: Never agree to buy an engine that the seller refuses to test for compression, citing the fact that the "motor is new" or "just from repairs", most likely, hiding the real state of the CNG.
Also, listen to the engine at idle speeds and when the throttle is sharply opened. Extraneous knocking, ringing or vibration, uncharacteristic for this model, is an excuse to refuse the deal. bearing The paddleshaft.
Reductor and lower unit: Hidden Threats
The gearbox is an expensive knot, and repairing it is often more expensive than restoring the engine itself. When you look at a 40 hp engine, be sure to ask when the oil in the gearbox last changed and what color it was. Normal oil should be transparent, amber or greenish (depending on the brand); If milk oil, water through the glands got into the gearboxes. If you see metal shavings in the oil (check the cork with a magnet), gear wear goes.
Check the back of the paddle shaft. Rock the screw up and down and side to side. A little backlash is acceptable, but if it's palpable and accompanied by knocks, then the bearings or bushings need to be replaced. propellerThe chips on the blades, the crumpled edges, are not just a loss of speed, but an imbalance that kills the lower unit bearings.
Check the lower unit pipe for cracks, especially in the attachment areas. Cracks can lead to water entering the exhaust system or even into the cylinders (through the cooling system), which is fraught with water shock. Make sure that all the bolts of the gearbox attachment to the lower unit pipe are tightened and have no traces of corrosion.
☑️ Checking the gearbox
Documents, history and legal aspects
Buying used equipment is always a risk of running into stolen or legally troubled property. serialCompare it to the number in the Floating Product Passport or the service book, and if there is no documentation at all, the risk of buying stolen goods increases many times, and registering such a motor in the GIMS will be almost impossible without additional examinations.
Find out the history of the engine. Where was it used? In fresh water or salt water? Salt water aggressively affects aluminum and steel, causing electrochemical corrosion. Motors that worked at sea, even when well maintained, always have a lower resource. Also check whether the engine was used for commercial purposes (rental, taxis). Commercial operation means that the engine worked for wear and tear, often without proper maintenance.
If the engine is imported, check for customs declarations or documents proving the legality of importation, especially if you plan to keep it on the account. The lack of documents can create problems when passing a check-up or when traveling abroad (if you plan to travel).
What to do if the number on the motor is not readable?
If the number plate on lower unit is corroded or painted so that it can't be read, it's a red flag. GIMS can refuse registration. It requires expertise that costs money and time. It's better to refuse this option.
Brands and models: what is in demand?
The 40 hp used market has its leaders and outsiders. Yamaha40XWS or the newer 40JET models are valued for their reliability and availability, but because of their popularity, they are most often counterfeited or sold by refurbished designers at the price of new ones.
Tohatsu and Nissan Marine They're also very popular, and their 40-horsepower engines are known for being unkillable and simple, and they're often heavier than their peers, but they're a cost of reliability. Mercury It is famous for good traction at the bottom but requires more skilled service. - Chinese brands (HDX, Parsun) secondary parts are cheap but their liquidity is low and the quality of spare parts may vary.
When choosing a particular model, read the powerboating forums. Learn about the "childhood diseases" of a particular series. For example, some models may have problems with electronics, others with carburetors. Knowing these nuances will help you bargain or even refuse to buy a problem one.
The popularity of the brand in the secondary market is a plus (easier to sell later), but also a minus (a higher risk of running into a fake or a “tired” engine due to high operation).
Frequently Asked Questions (FAQ)
Should I buy a 40 hp outboard motor with my hands if I don’t have experience?
If you have no experience, the risk of buying a problem engine is very high, it is better to bring an experienced friend, a mechanic or use the services of independent examination, saving on the purchase can turn into costly repairs.
What is the resource of the used engine 40 hp?
Resource depends on operating and maintenance conditions. 2T engines It usually takes 1500-2000 hours to repair. 4T The actual mileage in the watch is often hidden, so it is important to have a technical diagnosis.
Can I register a used motor without documents?
It's very difficult to register a motor with GIMS without documents, you'll need forensics to establish ownership and legality, which is long and expensive, and you'll want to look for options with a PS or a sales contract.
What to look for when buying a Chinese engine used?
Chinese engines often sin with the quality of metal (rapid corrosion) and electricians. starterThe parts may be available, but they are sometimes inferior to the original.
How to distinguish the rebuilt engine from the original?
Refurbished engines often have new paint on the bolts, unoriginal stickers, different year of release on the parts, and a perfectly clean lower unit pipe with a dirty engine should also be alerted.