How many shaft bearings are there between the gearbox and propeller on a 1993 mercury Force 70 2 stroke

1. Remove the retaining bolts that hold the steering shaft to the steering gearbox with a socket wrench.
2. Push the steering shaft down and out of the gearbox.
3. Remove the old universal joint from the steering shaft.
4. Install the new universal joint on the steering shaft.
5. Reinstall the steering shaft into the gearbox.
6. Tighten the retaining bolts to secure the steering shaft in place.

Assuming a traditional design it is probably rust and if fitted with a clutch pilot bearing, the gearbox shaft could be seized into it meaning considerable force might be needed to remove it. I have known them to be so seized into the pilot bearing that removing the gearbox actually pulls the bearing from the housing.

I am wondering what tailshaft bearing your gearbox is currently using that your question implies is incorrect?

Apart from heavy commercial gearboxes and 4wd off-roaders the only gearbox tailshaft bearings I have seen are plain thin-wall bronze types that once installed must be line-reamed or broached for a good fit with the propeller shaft or drive flange. So far I have only heard about folk needing them changing. In 40 years I have never seen one that has given trouble.

Have the engine and gearbox mounts checked ,check centre bearing in tail shaft

Most center bearings require that you disassemble the center flex joint, then remove bearing from the shaft which on some requires use of a press or some type of puller.

Hi Juztlove, I agree with you....The world would be a much better place if we all did! Is your vehicle manual or automatic? If its automatic each gear has a clutch and to that job is difficult and needs a very clean workshop. If it's manual and rear wheel drive, the first operation is to remove the propeller shaft, if it's front wheel drive, it will mean removing the front suspension and then the half shafts. Before you begin disconnect the battery. Remove the pipe into the clutch slave cylinder and drain the fluid into a suitable container. Loosen the bolts holding the gearbox mounting and the cross member. Remove all the bolts around the bell housing and then with the help of a friend and a jack gently pull the box towards you and get ready to support the weight. Once removed and out of the way, remove the bolts which hold the clutch cover (pressure plate) that is what holds in the clutch plate. Did I mention that this is not an easy job? It would be advisable to replace the pressure plate, clutch plate and thrust release bearing at the same time. When fitting back make sure that the clutch plate is aligned correctly and correctly centralized as the clutch cover is tightened. Here comes the good bit....Refit the gearbox using any appropriate swear words which come to mind, until the spline shaft aligns with the clutch plate and then once it has, slide on the gearbox and begin fitting and tightening the bolts from the top. Refit the rest in the opposite way from dis assembly. By the way you can stop swearing at that time. Best Regards John.

Welcome to FIxYa.com

REMOVAL AND INSTALLATION

Remove in the order shown in the figure. Install in the reverse order of removal.

I Image

1. Nut

2. Lock washer

3. Bolt

4. Nut

5. Nut

6. Lock washer

7. Bolt

8. Nut

9. Washer

lo. Nut

11. Lock washer

12. Bolt

13. Rear propeller shaft

Propeller shaft (4x2)

Before removing the propeller shaft, mark the flanges for correct installation.

Propeller shaft (4x4)

Before removing the propeller shaft mark on the front, and rear side flanges for correct

installation.

(4x2 Model)

When the propeller shaft is removed from the extension housing, immediately install the

SST into the extension housing to prevent oil leakage

B2200: 490259440

B2600i: 49 5120 440

1m a

Propeller shaft

1. Align the marks. And install the rear propeller shaft.

Tightening torque: 49-59 N.m (5.0-6.0 m-kg, 36-43 ft-lb)

2. Install the center bearing support assembly.

Tightening torque: 36-53 N.m 3.7-5.4 m-kg, 27-39 ft-lb)

3. Align the marks, and install the front propeller shaft.

Tightening torque: 49-59 N.m (5.0-6.0 m-kg, 36-43 ft-lb)

Thank you for using FixYa.com

Regards, Lee Davidian

if it were engine/gearbox you would feel the vibration at a specific rev range (say 3000 to 3500)but you say that when you put your foot on the clutch it gets worse....at 70 mph....so look for something from the tyres,wheels,bearings,rotors,drive shafts,
the first thing is to have the wheels dynamically balanced(up/down/sideways)then check bearings......,going up in cost,always start with the cheapest parts as these tend to go quicker.

sounds like the main shaft bearings within the gearbox itself. i would of said the release bearing but u already changed it. the main shaft doesnt spin with the clutch pedal pressed. check for oil leaks and check the oil level in the gearbox.

Axle Shaft: Service and Repair
Axle Shaft, Constant Velocity Type
Single cardan U-joint components are not serviceable. If defective, they must be replaced as a unit. If the bearings, seals, spider, or bearing caps are
damaged or worn, replace the complete U-joint.
REMOVAL
CAUTION: Clamp only the narrow forged portion of the yoke in the vise. Also, to avoid distorting the yoke, do not over tighten the vise jaws.
1. Remove axle shaft.
2. Remove the bearing cap retaining snap rings (Fig. 19).
It can be helpful to saturate the bearing caps with penetrating oil prior to removal.
3. Locate a socket where the inside diameter is larger in diameter than the bearing cap. Place the socket (receiver) against the yoke and around the
perimeter of the bearing cap to be removed.
4. Locate a socket where the outside diameter is smaller in diameter than the bearing cap. Place the socket (driver) against the opposite bearing cap.
5. Position the yoke with the sockets in a vise (Fig. 20).
6. Compress the vise jaws to force the bearing cap into the larger socket (receiver).
7. Release the vise jaws. Remove the sockets and bearing cap that was partially forced out of the yoke.
8. Repeat the above procedure for the remaining bearing cap.
9. Remove the remaining bearing cap, bearings, seals and spider from the propeller shaft yoke.
INSTALLATION
1. Pack the bearing caps 1/3 full of wheel bearing lubricant. Apply Extreme Pressure (EP), lithium-base lubricant to aid in installation.
2. Position the spider in the yoke. Insert the seals and bearings. Tap the bearing caps into the yoke bores far enough to hold the spider in position.
3. Place the socket (driver) against one bearing cap. Position the yoke with the socket wrench in a vise.
4. Compress the vise to force the bearing caps into the yoke. Force the caps enough to install the retaining clips.
5. Install the bearing cap retaining clips.
6. Install axle shaft.