Outboard Up or Down on a Boat Lift? What Engine Makers Say

Trim the outboard or sterndrive all the way down once the boat is raised and the lower unit hangs in air. That is the position the engine makers give for storage: Mercury's outboard manual says to store the outboard "in the full down position," and MerCruiser's sterndrive manual says to "store the sterndrive in the full down position." Water drains out of the cooling passages and gearcase, the trim rods sit retracted inside their cylinders, and sterndrive bellows rest in the shape they were molded in. Trim up only while you drive on or off, or when the lift cannot raise the boat high enough to get the gearcase clear of the water.

The other answer, "always tilt it up," is not wrong so much as written for a different boat: one floating in a slip. Both of its best sources, Yamaha's owner's manual and a lift maker's own operating guide, are about keeping the lower unit out of the water. On a lift that already does that, their reasons are used up and the reasons for down remain.

Default on a raised lift: drive full down, gearcase in air
Trim up: to drive on and off, and whenever the gearcase would otherwise sit in the water
How much lower the drive hangs: 13 to 18 in below the keel on three 21 to 24 ft boats (builder draft figures)
Sterndrives: full down is a MerCruiser instruction, because raised bellows "may develop a set"
Tilted up for any length of time: lock the tilt support and retract the trim rods (Yamaha)
Freezing weather: never leave it tilted; trapped water can freeze (Mercury)

Safety: a tilted engine is held up by oil pressure. Yamaha's manual warns that unless it is supported with the tilt-support lever, "the engine could fall back down suddenly if oil in the power trim and tilt unit should lose pressure." Never reach under a tilted outboard or a tilted sterndrive, never stand in the water or on the cradle under a raised boat, and keep everyone clear of the drive while it moves. Yamaha also says never to tilt the motor beyond trim range while the engine is running: "Severe damage from overheating can result."

Why the lift changes the answer

Every reason to tilt an outboard up is about water touching the lower unit. Yamaha's 60F owner's manual gives the case plainly: "If the engine will be stopped for some time, or if the boat is moored in shallows, the engine should be tilted up to protect the propeller and casing from damage by collision with obstructions, and also to reduce salt corrosion." That is advice for a boat that floats. A boat on a lift with its gearcase above the water has nothing to collide with, nothing to grow on it, and no salt water around it.

Hewitt's 2025 guide to using a boat lift makes the same point from the lift side: after raising the boat, "finish by trimming the motor fully up to reduce the chance of algae or debris building up on the prop and lower unit." Growth and debris need water. If the lift leaves the lower unit in it, the advice holds. If it does not, there is nothing left for tilting to prevent.

What a tilted engine does cost, even in air:

Water stays in. A vertical outboard drains downward through the gearcase and the exhaust outlet in the propeller hub. Tilted, the cooling passages and the hub outlet can hold water, which matters the first night it freezes.
The trim rods are out. On a power trim outboard the chrome rods extend as the engine tilts up. Yamaha's manual says to "retract the trim rods completely during mooring. This protects the rods from marine growths and corrosion which could damage the power trim and tilt mechanism." ODU Magazine describes what happens to rams left out on an idle boat: they "can even become fouled with barnacles," and "the rough spots on the shaft ultimately damage the seal allowing pressurized hydraulic fluid to leak out." Trimmed down, the rods are retracted by default.
Sterndrive bellows are stretched. See the sterndrive section below.
The engine is resting on hydraulics unless someone set the tilt support, which is the safety point above.

Does your lift get the drive clear of the water?

This is the only measurement that decides the question. With the drive up, the lowest point of the boat is the keel. With the drive down, NMMA's Discover Boating explains, "the lowest point will be the skeg in front of the propeller." Builders publish both drafts, and the difference between them is how much farther down the drive hangs than the hull:

How far a lowered drive hangs below the hull, from published builder specifications
Boat (drive)	Draft, drive up	Draft, drive down	Drive below keel
Wellcraft 221 Fisherman, 22 ft 4 in (single outboard)	14 in	27 in	13 in
Robalo R242, 24 ft (twin outboards)	20 in	35 in	15 in
Sea Ray SPX 210, 21 ft 8 in (MerCruiser Alpha One sterndrive)	17 in	35 in	18 in

So a lift that stops with the keel 12 in above the water leaves the skeg of a lowered drive roughly 1 to 6 in below the surface on these boats. To store the drive down and dry, the lift has to put the keel more than 13 to 18 in above the water, plus whatever wakes and chop add. Boat Lift Lab's usual target for the hull itself is 12 in above the highest expected water on sheltered water, 18 to 24 in on busy lakes and 24 to 36 in on exposed sites, worked through in water depth requirements. On many installations the hull target already gets the drive close; on lifts with short travel, low pilings or a big seasonal swing, it does not.

Your own number is easy to get: raise the lift to the top, trim the drive full down, and look. If any part of the gearcase or skeg is wet, measure how far it sits below the surface. The water depth calculator shows how the margin changes as the lake or tide moves through the season.

Worked example: a lake lift with 3 ft of seasonal swing

A 22 ft single-outboard boat like the Wellcraft above: the drive hangs 13 in below the keel. The lift raises the keel to 30 in above the water at the spring water level. In spring, the lowered skeg sits 30 - 13 = 17 in above the water: store it down.

By late summer the lake has dropped 3 ft, so the same lift puts the keel 66 in above the water and the skeg 53 in clear. Still down.

Now run it the other way: a lift at the top of its travel in spring with only 10 in of keel clearance. The lowered skeg would be 3 in under water. Here the drive is trimmed up, with the tilt support set and the rods retracted, until the water drops far enough to lower it. A wake that slaps the hull at 10 in of clearance is also a reason to look at the lift's travel, because the drive is not the only part getting wet.

The routine at the lift

Coming in: trim up enough to clear the bottom and the lift's rear cross member. Hewitt's guide: "If water depth is limited near the lift, begin trimming the motor up slightly as you approach to avoid hitting the bottom." The pontoon version of this, a skeg striking the cradle, is in the fault table on pontoon boat lifts, and the same goes for sterndrive legs (see boat lift by boat type).
Center and stop the engine. Line up on the guide posts, shut down, and only then tilt beyond trim range.
Raise the lift to the top with nobody in the boat or near the cradle.
Trim the drive full down if the gearcase is clear of the water. If it is not, tilt it up, set the tilt support, then retract the rods onto it.
Before lowering the lift next time, trim up again so the drive does not meet the cross member or the bottom on the way down.
Do not start the engine while the lift holds it up. With the gearcase in air the intakes are dry; how to run it safely on a lift is in can you run your boat engine on the lift.

Power trim runs off the boat's battery, so if you switch the battery off for storage, trimming up for the next launch means switching it back on first. The other thing to do from the swim platform while the drive is down is the plug: whether it stays in or out on a raised boat is covered in drain plug in or out on a boat lift.

Sterndrives: down is a manufacturer instruction

For an outboard, down is the better choice. For a sterndrive it is written into the manual. MerCruiser's operation manual for its 4.3 MPI sterndrive, in the section on draining the sterndrive, says to "store the sterndrive in the full down position" and gives the reason: "The universal joint bellows may develop a set when stored in a raised or up position, causing the bellows to fail when returned to service and allowing water to enter the boat." Lowering the unit to the full down/in position is also a step in that section's draining procedure.

That last clause is why this matters on a lift: the failure shows up after the boat is back in the water, and the water comes into the boat. A sterndrive that has to sit tilted on a low lift for weeks is a reason to raise the boat higher, not a reason to accept the set.

When up is the right answer

Drive position on a boat lift by situation
Situation	Drive	Why
Lift raised, gearcase fully clear of the water	Full down	Drains, rods retracted, bellows relaxed, no hydraulic hold
Lift raised, skeg or gearcase still in the water	Up, tilt support set, rods retracted	Keeps growth and salt off the lower unit (Yamaha, Hewitt)
Same, but below freezing	Get it clear: raise the lift, haul out, or winterize	Tilted storage traps water that can freeze (Mercury)
Driving on or off, lowering or raising the lift	Trimmed up as needed	Clears the cross member and the bottom
Salt or brackish water, low lift	Up until the boat can be raised	A lower unit left in salt water corrodes and grows (see tidal and saltwater installations)
Hurricane or surge forecast	Follow the boat removal plan	See hurricane preparation

Fouling on a gearcase that has been left in the water is cleaned the same way as fouling on the lift's own cradle, with plastic scrapers rather than wire brushes; see boat lift cleaning. If a lower unit's anodes or the lift's metal are disappearing faster than they should, the cause is usually galvanic or stray current, covered in boat lift corrosion protection.

Freezing weather

Mercury's operation manual for its 8 and 9.9 hp FourStroke outboards is direct: "Storing the outboard in a tilted position can damage the outboard." It explains that water trapped in the cooling passages, or rain water collected in the propeller exhaust outlet in the gearcase, can freeze, and the instruction is to "store the outboard in the full down position." The same logic applies to any outboard sitting on a lift into the first frosts: a vertical gearcase drains, a tilted one can hold water where ice does damage.

In ice country the season usually ends with the boat off the lift and the engine winterized to its maker's procedure. Until then, down and dry is the position that survives a surprise cold night. The lift's own end of season is in winterizing a boat lift.

Where this answer stops applying

Your engine's manual says otherwise. Follow it. This page applies the Yamaha, Mercury and MerCruiser instructions quoted above to a boat on a lift; it does not replace your own engine's storage section.
Inboard and V-drive boats have no drive to trim; their running gear clearance is a bunk and cradle question (see wake boat lifts).
Canopies: an outboard tilted up extends the boat's length and height, which matters for canopy coverage and clearance. See boat lift canopies.

Frequently asked questions

Should I leave my outboard up or down on a boat lift?

Down, once the lift has raised the boat so the gearcase is out of the water. Mercury's manual says to store the outboard in the full down position so water drains, and a lowered outboard keeps its trim rods retracted. Tilt it up only if the lift cannot raise the lower unit clear of the water, and then set the tilt support and retract the rods.

Why do people say to keep the motor tilted up?

Because the advice comes from boats kept in the water. Yamaha's manual says to tilt up when the engine will be stopped for some time or moored in shallows, to protect the propeller and casing and reduce salt corrosion. A lift's guide says the same to keep algae off the lower unit. Once the lift holds the gearcase in air, those risks are gone.

Should a sterndrive be up or down on a boat lift?

Down, if the drive clears the water. MerCruiser's manual says to store the sterndrive in the full down position because the universal joint bellows may develop a set when stored raised, then fail when the boat goes back in the water and let water into the boat. If your lift cannot get the drive clear, raise the boat higher rather than store it tilted for weeks.

How high does a boat lift need to raise the boat for the motor to be down?

Higher than the drive hangs below the keel, plus wave margin. Published drafts show the drive down sits 13 to 18 in below the keel on typical 21 to 24 ft boats, so the keel needs more than that above the water. Check your boat by raising the lift to the top, lowering the drive fully and seeing whether the skeg is wet.

Sources and further reading

Yamaha Motor, 60F owner's manual: Tilting up/down, Procedure for tilting up, Procedure for tilting down (tilt up when stopped for some time or moored in shallows; tilt-support lever; retract trim rods during mooring) (https://manualslib.mx/manual/83843/Yamaha-60F.html?page=106)
Mercury Marine, 8/9.9 FourStroke Operation, Maintenance and Installation Manual (1F10201BK), Storage: Positioning Outboard for Storage (https://www.manualslib.com/manual/3473244/Mercury-1f10201bk.html?page=107)
Mercury MerCruiser, Sterndrive 4.3 MPI operation manual, Section 6 Storage: Draining the Sterndrive (full down position; universal joint bellows set) (https://www.manualslib.com/manual/1139630/Mercruiser-Sterndrive-4-3-Mpi.html?page=138)
Hewitt, "Learn How To Use A Boat Lift Properly," March 24, 2025 (https://www.hewittrad.com/about-us/news-and-events/learn-how-to-use-a-boat-lift-properly)
National Marine Manufacturers Association, Discover Boating, "What is Boat Draft?" (drive up and drive down draft) (https://discoverboating.com/resources/boat-draft)
BoatTEST, Wellcraft 221 Fisherman (2016-) specifications (draft up 14 in, down 27 in) (https://boattest.com/boats/wellcraft/221-fisherman-2016)
BoatTEST, Robalo R242 (2016-) specifications (draft up 20 in, down 35 in) (https://boattest.com/boats/robalo/r242-2016)
BoatTEST, Sea Ray SPX 210 Sterndrive (2024-) specifications (draft up 17 in, down 35 in) (https://boattest.com/node/137024)
Outdoor Utility (ODU) Magazine, "Are You Slip Savvy," January 2, 2014 (trim rams fouled by barnacles, damaged seals, retracting rams onto the engine rest) (https://www.odumagazine.com/are-you-slip-savvy/)