How much does it cost to replace a lower unit on a boat?

A typical set of parts for the gearcase can cost $500-600 and may go higher if the gearcase is severely damaged. If you have your local mechanic repair the lower unit, his labor will run about $300-400 for this type of repair.

Are Mercury and Mariner lower units interchangeable?

No. Different type lower. It doesn’t have to be a black max, and it can be a mercury or mariner. The XR4 was just a higher performance version of the 150HP made for bass boats, put out more like 160 HP.

How do I know if my MerCruiser lower unit is bad?

Bad outboard lower units can give the operator shifting issues, and other signs will include water in the gear lube, metallic particles on the drain screw magnet, clunking sounds when shifted, or the loss of the ability to shift into gears.

Are outboard lower units interchangeable?

If you are looking to replace your lower unit on your vintage Johnson/Evinrude outboard then eBay is a great place to find a good deal. It is true that Johnson / Evinrude lower units can be interchanged however, you can’t rely on visual comparison alone.

Do you have to break in a new lower unit?

Technically, a new gearcase should be broken in as if it were a new engine (for the first hour). Vary RPM’s, no need to “tuck trim” in this case. After 1 hour, normal operation. Change gear lube at 10-20 hours (Mercury or Quicksilver High Performance).

How often should you change lower unit oil?

every 100 hours
Most sterndrive and outboard manufacturers advise you to change the gearcase oil in your lower unit every 100 hours or once a year (whichever comes first). Clean oil is critical for protecting the heavily loaded gears in your lower unit and preventing expensive damage.

How does water get into lower unit?

You have seals on both sides of your water pump. You can have a warped lower unit which will allow water to seep in; even with new seals. You can have a touch or roughness on a seal seat that doesn’t let a seal seal. Take the lower unit to a “good” dealer and have them go through your lower unit.

Are Mercury and Tohatsu parts interchangeable?

So, if Tohatsu makes Merc, are the parts not interchangeable, is a merc shop not equally equipped to service a Tohatsu as it is a Merc if they are essentially the same motor.

How long do lower units last?

Aside from the well documented exhaust corrosion issue faced with the F200/F225 and some F250s in the 2002-2005 model year range, these motors when properly maintained, propped and run can provide 4,000-14,000 hours of life (lower units may not last as long).

How long does it take to break in a lower unit?

What kind of water pump does a Mercury lower unit have?

Product Description This listing is for a New Aftermarket Mercury 3.0L Lower Unit. These models use a metal water pump and have dual-water pick ups. This unit has models for both 8- and 13-spline driveshafts When replacing a unit with an 8-spline Driveshaft, a two-piece driveshaft must be used.

How big is the lower unit on a Mercury V6 outboard?

Sterndrive Engineering Mercury V6 Outboard Replacement Lower Unit 2:1, 25″ Driveshaft Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling… You have come to the right place for Mercury Outboard Replacement Drives.

What kind of driveshaft does a Mercury lower unit have?

This listing is for a New Aftermarket Mercury 3.0L Lower Unit. These models use a metal water pump and have dual-water pick ups. This unit has models for both 8- and 13-spline driveshafts When replacing a unit with an 8-spline Driveshaft, a two-piece driveshaft must be used.

What is the gear ratio for a Mercury V6 outboard motor?

BPI148T84 Lower Unit for Mercury V6 2.5L 20 Inch Transom RH 1.87:1 Mercury Remanufactured V6 Outboard Gearcase 1.87:1 Gear Ratio Fits 135, 150, 175, 200, and 225 HP 2.5L V6 Outboards 8-Spline Driveshaft for 20″ RH…