Syringing of a outboard motor is a procedure that many watercraft owners either ignore or perform with errors. grease-proofing It extends the life of the engine by 30-40%, preventing corrosion and premature wear of parts, especially for motors that operate in salt water or under extreme loads, such as for example, for motors that are used in the field of water. Yamaha F25 or Mercury 15where the gearbox operates under high loads.
In this article, we're going to look at not only the basic technology of syringe, but also the nuances that even the official manuals don't mention. What Oil Kills Bearings in Season 2Why you can't use syringes from car transmissions, and how to check if water has entered the gearbox after the procedure. This is relevant for two-stroke and four-stroke engines with power from 2.5 to 250 hp, including popular models. Honda BF20, Suzuki DF9.9 and Tohatsu MFS25.
1. Why you need to syringe an outboard motor: the physics and consequences of ignoring
The outboard motor gearbox is a node with pole-wheelThey're the ones that transfer torque from the engine shaft to the propeller. When you're working, the parts rub against each other at 500 kg/cm2, and water and salt accelerate their corrosion by 3-5 times. Without lubrication, after 50 hours, bullies appear on the gears, and the bearings begin to "howl" at high speeds.
What happens when there is no syringe:
- 🔥 Overheating of the gearbox The oil burns out, forming an abrasive plaque that scratches the metal.
- 💧 Corrosion of bearings The salt crystallizes in microcracks, blocking rotation.
- ⚙️ Wearing gears - without lubrication, the teeth are washed unevenly, which leads to vibrations and breakage of the shaft.
- 💸 Renovation for 50-150% of the cost of the engine - Replacement of the gearbox Mercury 60 It costs 80-120 thousand rubles.
Manufacturers recommend syringe motor every 50-100 hours Or once a season (even if the boat was standing in the winter!) When operating in salt water, the interval is reduced to 30 hours. Honda BF50 The instructions clearly state: "Grease the gearcase every 50 hours or annually".
⚠️ Attention: If an emulsion (a mixture of oil and water) leaks from the drain hole after syringing, it means that the gearbox seals are damaged. You can't operate the motor in this state - you need to replace the coils.
2. Which oil to choose: analysis of compositions and fatal errors
Mistake #1: Use transmission oils (for example, LIQUI MOLY 75W-90They contain additives aggressive to non-ferrous metals, which are made of gear gears gears, resulting in 2-3 seasons teeth become covered with ulcers, and bearings "grab".
For outboard motors only specialized ones are suitable waterproof lubricants classy NLGI 2 and marking Marine GreaseBest options:
| Brand and model | Type of base | Temperature range | Features | Price for 400g |
|---|---|---|---|---|
| Mercury 2-4-C Marine Grease | Lithium + aluminum | -30°C to +150°C | Contains anticorrosive additives for salt water | 1,200 rubles. |
| Yamalube Marine Grease | calcium | from -20°C to +130°C | It is well maintained on vertical surfaces | 950 rubles. |
| Quicksilver Premium Marine Grease | lithium | -25°C to +160°C | Universal for gearboxes and outboard motors | 1,100 rubles. |
| Molykote 111 | Synthetic | -30°C to +180°C | For extreme loads (racing motors) | 1,800 rubles. |
Important: oils on sodium-based (for example, solidol) strictly prohibited - they are washed with water in 10-15 hours of operation. molybdenum (for example, Litol-24) if the gearbox has bronze or brass parts, molybdenum forms galvanic pairs with them, accelerating corrosion.
3. Tools and preparation: what to have at hand
For the syringe, you will need:
- 🔧 Syringe for outboard motors (Do not confuse medical or automotive!) The best models are: Attwood 8820 (with a flexible nose) or Sierra 18-8130 (with a gauge).
- 🛢️ Oil (see section above) - 1-2 tube of 400g.
- 🧰 Keys.: end by 8 or 10 mm (for drain plug), carob by 17 mm (for pour plug).
- 🧴 Cleaner: WD-40 or kerosene for washing the fittings.
- 🧻 Gloves and cloths Oil from hands is washed only with solvent.
Preparation of the engine:
- Set the boat on a flat surface or hang the motor on the bracket.
- Start the engine for 2-3 minutes to warm up the oil in the gearbox - so it will better merge.
- Clean the drain and filler holes from the dirt with a metal brush.
- Prepare the container for working out (a cropped plastic bottle will do).
☑️ Preparation for douching
If the motor was operated in salt water, before syringing, wash the gearbox. freshwater (Minimal washing can be used) Kärcher It's going to remove the salt crystals that can break down the new lubricant.
4. Step-by-step instruction: how to syringe the outboard motor without errors
Algorithm for most motors (example: Yamaha F60):
- Plum of old butter:
- Unscrew. drain-cork (usually located at the bottom of the gearbox). Mercury It's marked with a red ring, on Honda - Blue.
- Let the oil drain completely (10-15 minutes) If it's dark with metal particles, the gearbox is worn out.
- Washing (if necessary):
- Pour 100-150 ml of kerosene or a special cleaner (Yamaha Gearcase Flush).
- Scroll the screw shaft manually 5-6 times, then drain the washing liquid.
- Join the syringe to filler (top traffic jam) Suzuki It could be under a rubber cap.
- Press the oil until it starts to flow out of the drain hole – this is a signal that the gearbox is full.
- Twirl the drain plug, then add another 50-100 ml of oil and twist the fill plug.
Critical: don't confuse the holesIf you put the oil in the drain hole, it doesn't get into the gearbox, it just leaks out. Tohatsu filler fitting is sometimes hidden under anti-corrosion smear - clean it with a wire brush.
What to do if the oil doesn't go into the syringe?
If the oil is not pumped, check:
(1) Is the nose of the syringe clogged (clean with a needle).
(2) Is the syringe tube twisted (straighten it).
(3) Is the oil too thick (heat the tube in warm water).
(4) Whether the thread on the fitting is broken (replacement of the plug will be required).
After syringing, manually scroll the screw shaft 10-12 times so that the oil is evenly distributed across the gears. Then start the engine at idle speeds for 1-2 minutes and check if the oil leaks from the traffic jams.
5. Common Mistakes and How to Avoid Them
Syringe errors reduce the life of the motor by 40-60%, and here are the most common:
- 🔌 Using a dirty syringe Residues of old oil or sand scratch the glands. Rinse the syringe with kerosene after each use!
- 🌡️ Syringe on a cold engine - thick oil will not fill all the cavities of the gearbox.
- 🔧 Pulling traffic jams Aluminum reducers (e.g., on the Mercury 9.9) crack at a force greater than 20 Nm. Use a dynamometer key!
- 💧 Ignoring water in oil If you leak an emulsion, you have to disassemble the gearbox and change the ossels, and if you use water in the oil, you corrosion the shaft.
- ⏳ Interval disturbance - It's pointless to syringe once every 2 seasons to check the box.
⚠️ Attention: On the engines with hydro-lift (for example, Suzuki DF140) before syringing, the trimmer should be moved to the lowest position, otherwise the oil will not fill the top of the gearbox, and the bearings will remain without lubrication.
Another common problem is that airfall This happens when the nose of the syringe is not tightly attached to the junction. rubber-sealer (for example, Attwood 8825) or wrap the screw thread with fume tape.
6. Features of syringing of motors of different brands
The design of gearboxes varies among manufacturers, so there is no universal instruction.
| Brand | Design features | Recommended oil | Syringe interval |
|---|---|---|---|
| Mercury/Mariner | Two connections: bottom drain, top filler. On models >75 hp, there is an additional connection for lubricating the shaft bearing. | Quicksilver Premium or Mercury 2-4-C | Every 100 hours or once a season |
| Yamaha | The filler is often hidden under a plastic plug. On motors >115 hp there is a separate oil tank. | Yamalube Marine Grease | Every 50 hours or 2 times a season |
| Honda | The magnet drain plug -- check it for metal shavings. BF150+ has the connections on the side. | Honda Marine Grease or Molykote 111 | Every 100 hours. |
| Suzuki | The DF25-DF70 has a filler fitting under a rubber cap, and the engines >90 hp use semi-synthetic oil. | Suzuki Marine Grease | Every 50 hours. |
| Tohatsu | The connectors often rust - treat them WD-40 10 minutes before spinning, there's an extra nipple on the MFS40+ to blow air. | Tohatsu Gearcase Lubricant | Every 100 hours. |
For engines. Parsun and other Chinese brandsHangzhou, Sea-Pro) use oil Yamalube or Mercury 2-4-CBut reduce the syringe interval to 40 hours – their gearboxes are less protected from corrosion.
On the engines. Evinrude/E-TEC After syringing, be sure to check the oil level through the viewing window on the gearbox. If you can't see the oil, add another 50-100 ml.
7. How to check the quality of the syringe: 3 tests
It's not enough to just pour the oil, you have to make sure that the procedure is successful.
- Leak test:
Start the engine and let it work for 5 minutes at idle speeds. Check the gearbox for oil drips from corks or glands. If the oil oozes through the thread, tighten the corks or replace the ossicles.
- Foaming test:
After syringe, pour 2-3 drops of oil onto white paper. If there are bubbles or emulsion, there is still water in the gearbox. You will need to wash again.
- Lubrication uniformity test:
Scroll the shaft manually, it should rotate smoothly, without jerks or extraneous sounds. If you hear a crunch, the oil did not get on the upper bearings (undersized or air traffic jam).
On the engines with gear-box (for example, Mercury 150 Verado) After syringe check the readings in the service menu. Normal temperature after 10 minutes of operation is 40-60 ° C. If higher, the oil does not circulate.
If you start to use the engine louder at higher speeds after syringing, then the oil is too thick or not of the type.
8. Frequent Questions (FAQ)
Can I use the engine without heating up?
It's possible, but it's not efficient. Cold oil is thick and won't fill all the cavities of the gearbox. As a result, the top bearings will be left without lubrication. Warm up the engine for at least 2-3 minutes at idle speeds.
What if I can’t get the drain plug?
If the cork is boiling:
- Treat it with penetrating lubricant.WD-40 or Liqui Moly MoS2) and wait 10-15 minutes.
- Use the end key with the extension for a larger lever.
- Heat the gearbox with a building hair dryer (no higher than 60°C) to expand the metal.
- If nothing helps, drill the plug and cut a new thread (remix will be required).
How much oil should leak out when draining?
The volume of oil in the gearbox depends on the model of the motor:
- Motors up to 20 hp - 150-200 ml.
- Motors 20-70 hp - 250-350 ml.
- Motors over 70 hp - 400-600 ml.
If it leaks less than normal, the gearbox has old oil or there is a blockage in the channels, if more, perhaps water in the oil (the emulsion takes up a larger volume).
Can I use Lithol-24 or Solidol?
Absolutely not!
- Not water resistant - washed out in 10-15 hours.
- Contain aggressive additives that destroy bronze parts.
- They thicken at low temperatures, blocking the rotation of the gears.
Exception - temporary use Litola-24 for the preservation of the engine for the winter (if there is no specialized lubrication), but before operation it must be drained.
Do I need to syringe a new engine?
Yes, even a new motor needs to be syringed after the first 20 hours of running. conservatoryIt's not designed to last long, and after it's run, it's always replaced with a permanent lubricant. Honda BF10 The manual says: "Change gear oil after first 20 hours of operation".