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For the gear cases that you have to pull the carrier on. Replacing the output or prop shaft seals in a Mercury outboard requires more than a few steps but otherwise its not that difficult of.
298 rows Lower Unit Seal Kit.
Mercury outboard lower unit seal replacement. If you see a small thin streak of milky-colored oil coming from the bottom of the lower unit of the motor you must replace the prop shaft seals. Changing the seals on the prop shaft of Mercruiser engine is a project for winter or the off-season. Replacing the seals themselves is a straightforward job but before you can replace them you have to.
Mercury 40HP 2-Stroke Prop Shaft Seals Replacement Oil dripping from beneath the propeller is an indication of a leaking prop shaft seal in the lower unit. Replacing the output or prop shaft seals in a Mercury outboard requires more than a few steps but otherwise its not that difficult of. 298 rows Lower Unit Seal Kit.
Before install lower unit assembly bring shift to neutral position by turning shift rod. Insert two dowel pins 3. Apply driveshaft splines and shift rod splines with Water Resistant Grease.
Apply Mercury Silicone Seal lightly to mating surfaces of gearcase and driveshaft housing. Set clutch control lever 4 at neutral position then slide. Mercury Marine gear cases have a mixed ratio of lower units.
Some of them require you to pull the bearing carrier in order to change out the prop shaft seals. Then the other half you can change them without pulling the carrier. For the gear cases that you have to pull the carrier on.
We have a 1980s Mercury 40HP motor that has a leaking lower main seal. I fix my own cars but have never attempted to even take the cowl off of an outboard. The local shop wants something like 600 to make the repair and I just figured I would do some research before turning it over to them.
Not to mention finding the cash is tough right now. Seal Kit Lower Gearcase Mercury 70-75hp Mfg Part. 814669A1 Click to see substitution Items.
Not In Stock 8164641 Oil Seal Shift Shaft OEM Mercury 40-275hp Verado Force 7590120hp Cross Ref. 76384 816464 8164641 Mfg Part. 26-816464 1 In Stock.
SEI Mercury Outboard 30L Replacement Lower Unit 175 25. Sterndrive Engineering Mercury Outboard 30L Replacement Lower Unit 1751 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. 18-2654 - Lower unit seal kit fits some 35hp40hp 2 cyl 40hp 4 cyl 45hp 50hp 4 cyl 50 60hp 3 cyl 70hp. 18-2697-1 - Lower unit seal kit Mercury Mariner 6hp 8hp 99hp and 15hp with sn A197112 up.
Lower Unit Gearcase Seal Kit for Mercury Mariner Outboard Sealing the gear oil inside the gearcase and keeping water from intruding into the gearcase are the two aims of all the shaft seals o-rings spaghetti seals and gaskets in a lower unit. This is the bottom crankshaft seal on the KF-3 for serial 358552 thru 358612 and 358616 up. This is the drive shaft seal for Mark 10 10A 15A 28 28A 40H 55H Merc 100 150 200 350 500 650.
This is the prop shaft seal for Mark 75H. Remove the inner and outer oil seals from the bearing carrier assembly. Apply a small amount of red threadlocker to the outside of the new oil seals.
Install the inner oil seal into the bearing carrier assembly. Use a 19mm impact socket to drive the seal 18th of an inch beyond the lower lip inside the assembly. Approximate cost for lower unit seal replacement The LU needs to be pressurevacuum tested to be sure where the leak is.
1 drain gear oil 2 pressurize to 15 psig max 3 good LU will hold some pressurevac for 45 minutes 4 submerge in water to find leaks. Lower Unit Seal kit contains all lower unit seals and gaskets for automatic transmission models Mark 1010A15A Mark 28 28A Merc 100 150 200 with auto trans and Merc 250. Does not include the seal oring above the impeller on models with open bottom pump housing.
Unnecessary removal of this housing is not recommended. The lower unit on Mercury outboards must be removed to change the water pumps impeller. Replacing the lower unit is part of replacing your water pumps impeller exchanging a drive shaft of one length for another length or replacing the oil seals on drive or propeller shafts.
The lower unit on a 120hp Force outboard motor had water in it and it froze pushing the gear housing out breaking the tabs off the housing. The bearing where rusted and stuck. Took it to an outboard motor repair shop and had all the seals replaced.
Repair Difficulty Hard. ForceMercury 34CYL Lower Seal Kit. 1643-7406A34 Mercury Outboard 35-50 Hp Lower Unit Gear Case Complete Short Shaft.
Sierra 18-2626 Lower Unit Seal Kit for Mercury Chrysler Force Outboard Engines Sierra high-quality engine parts are designed to meet OEM specifications. Fits MercuryMariner 100115125 hp 2-cycle OB 0B209468 newer w either a 3 or 6. Put the outboard in a vertical position.
The prop shaft should remain parallel to the ground. If the drain seals are in the back of the lower unit. If they are on the bottom of the nose of the gearcase.
Then you want to tilt the engine or lower unit up to make the drain screw the lowest position on the gear. Can I replace the water tube seal on the water tube on mercury 175 v6 1998 from the bottom by just removing lower unit. - Answered by a verified Marine Mechanic We use cookies to give you the best possible experience on our website.
Removal Replacement of the Shaft Seals Without Disassembling the Lower Unit. This section deals with either the driveshaft seal below the water pump OR the prop shaft seals which consist of 2 back to back seals of the same size. This back to back method uses one to keep the water out while the other keeps the oil in.
Retaining Ring Wrench - 92mm OD 8 Tooth. Retaining Ring Wrench - Handle. Retaining Ring Wrench - 109mm OD 16 Tooth.