Helena Frye
If your boat won't go forward or reverse, it could be due to a variety of issues. Some possible reasons include problems with the shifting cables, the clutch dog, the cam shift, the reverse gear, or the shift rod connection. It could also be related to the temperature of the engine or issues with the throttle. To troubleshoot the issue, you can try checking the shifting cables, inspecting the clutch dog and reverse gear, or verifying the shift rod connection. It is recommended to refer to service manuals and seek assistance from marine mechanics or professionals in boat repair forums.
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What You'll Learn
The problem could be a missing washer on the shift cable linkage
If your boat won't go forward or reverse, the problem could be a missing washer on the shift cable linkage. This issue has been encountered by other owners of Mercury boats, particularly those with a 2.5L mercruiser 120hp engine.
In one instance, a boat owner noticed that a zip tie was holding the shift shaft assembly together, and upon further inspection, it was discovered that the washer was missing. This resulted in the boat jolting forward when attempting to shift into forward gear, and the boat would not idle properly as the shifter position was off-centre.
To address this issue, you will need to access the shift shaft, which is located in the lower portion of the engine. Before beginning any work, it is important to drain the lubrication from the engine by removing the screw on the front port side, which is typically marked as the drain. The vent, located on the upper portion, will also need to be opened by removing its screw.
Once the lubrication has been drained, you can proceed to unbolt the lower portion of the engine and carefully separate the intermediate shift shaft from the lower shift shaft. Turn the lower shift shaft all the way clockwise, and then slip the new washer onto the shaft. Ensure that the intermediate shift shaft is pointing straight ahead before reassembling the engine.
It is important to note that this procedure may vary slightly depending on the specific model and configuration of your Mercury 115 engine. Always refer to the service manual for your boat to ensure that you are following the correct procedure for your particular model. Additionally, exercise caution when working on boat engines to avoid injury or damage to the boat.
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The issue may be with the clutch dog, cam shift, or reverse gear
If your boat won't go forward or reverse, the issue may be with the clutch dog, cam shift, or reverse gear. These parts are known to be somewhat weak on Mercury engines. The clutch dog is responsible for engaging the gears, so if it's not functioning properly, the boat may not be able to shift into gear. The cam shift is also important for shifting, as it moves the clutch dog into the correct position. Finally, the reverse gear itself may be damaged or worn, preventing the boat from going in reverse.
To troubleshoot the issue, you can start by checking the shifting cables. When you shift into forward, you are pushing on the cable, and when you shift into reverse, you are pulling on it. So, a broken or weak cable will affect reverse more than forward. Have someone hold the end of the cable with pliers and try shifting into reverse to see if that's the issue. You can also try adjusting the shifting cable, as they can stretch over time.
If the cables are not the issue, the problem may be with the clutch dog. Unfortunately, diagnosing clutch dog wear typically requires taking apart the lower unit. However, some signs of clutch dog wear include the propeller only spinning one way in forward and not spinning at all in reverse. If the clutch dog is indeed the problem, you may need to replace it or rebuild the lower unit, as repairing these parts can be complex and expensive.
Another potential issue is the cam shift. The cam shift works in conjunction with the clutch dog to position it in the correct gear. If the cam shift is not synchronized with the remote control position, it can affect the boat's ability to shift into gear. Adjusting the cam shift may require removing the prop shaft and centering it in the N position before reinserting it and testing the propeller.
Finally, the issue could be with the reverse gear itself. If there is grinding noise when trying to shift into reverse, it could indicate damage to the gears. In this case, you may need to replace the gears or rebuild the lower unit.
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It could be a problem with the shifter cable or clutch
If your boat won't go forward or reverse, it could be a problem with the shifter cable or clutch. This is a known issue with the Merc 115, and there are a few things you can try to troubleshoot and fix the problem.
First, check the shifter cable. Ensure that the cable is properly connected and that there are no kinks or severe bends. You can try unhooking the cable at the motor and manually shifting the gear with the shift linkage. If you can shift into forward and reverse gears with no issues, then the problem is likely with the shifter cable.
Another potential issue could be with the clutch. If you hear a rattling noise when the engine is idling, it could indicate a problem with the clutch dog. Try pushing the shifter pin with your finger; if it's stiff, it could be a sign that the clutch is not engaging properly.
To further diagnose issues with the clutch, you can try the following steps:
- Disconnect the remote shift cable from the engine.
- Put the engine's shift linkage in neutral (N) and free spin the propeller with your hand.
- Slowly move the shift lever towards reverse (R) while wiggling the propeller with your other hand.
- Feel for the slots and cogs trying to line up, and once you feel engagement, mark a spot on the shift linkage for reference.
- Return the shift linkage to the neutral position and reattach the shift cable.
- Try shifting into forward and reverse again to see if the issue has been resolved.
If none of these steps work, it may be necessary to take your boat to a marine mechanic or dealership for further diagnosis and repair. They may need to adjust or replace the shifter cable, clutch, or other related components.
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The shift rod connection may have come apart
If your boat is not moving forward or backward, it could be that the shift rod connection has come apart. This is a common issue with Mercury Mariner 115 I6 engines. The shift rod connects the shift/throttle bracket to the engine. The bracket is bolted to the left side of the engine.
To fix this issue, you will need to remove the shift/throttle bracket. To do this, you will need to remove the three bolts holding it in place. One of these bolts is located under the bracket and is not accessible without tearing the engine apart. You can either attempt to remove this bolt or use a "redneck fix" by drilling a hole to access it with a socket. Once the bracket is removed, you can inspect the shift rod connection and ensure it is secure.
It is also possible that the black plastic clip on the rear of the engine shifter lever has broken, preventing the shift cable end from being clipped on. In this case, you will need to find a replacement clip.
If you are still having issues with shifting, you may need to adjust the shift linkage. This can be done by turning the shift shaft counter-clockwise to move from forward to neutral to reverse. Do not turn the shift shaft more counter-clockwise than when the lower unit is in reverse, as this may damage the shift cam or shifting plunger.
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The shifting cables may need to be replaced
If your boat won't go forward or reverse, it could be that the shifting cables need to be replaced. This is a common issue with boats and there are a few things you can do to troubleshoot and fix the problem.
First, check your throttle by pressing the button on it to advance it. This will disengage the shifting mechanism and only work the throttle. See if this reduces the tension in the shifter. If not, the next step is to disconnect the shifter cable at the motor and try to shift it manually. This will help you determine whether the issue is with the cable or something else.
If you determine that the cable does need to be replaced, you can purchase new Mercury control cables for your outboard. These cables are vital to the functionality of your boat, connecting the control head and the propulsion unit. When replacing the cables, you can find direct replacements that meet OEM specifications, such as the Teleflex Marine Control Cable for Mercruiser, Mercury Gen II 2003, and newer models. These cables come in a range of lengths to fit different boat sizes and are designed to provide a smooth and dependable ride.
To ensure a proper fit and smooth operation, it is important to get the correct replacement cable for your specific boat model. You can use your drive and engine serial numbers to determine the correct service manual and identify the right parts. With the right tools and guidance, you should be able to get your boat running smoothly again in no time.
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Frequently asked questions
There could be a few reasons for this issue. It could be due to a problem with the shifting cables, the clutch dog, the cam shift, or the reverse gear. It is also possible that the cable adjustments are off, or there is a missing washer on the shift cable linkage.
First, check your shifting cables. Move the shift handle from forward to neutral to reverse and observe if the cable moves in both directions. If it does, the control is working. If the control works but you still can't shift gears, you may need to replace the shift cable.
If the problem is with the shifting cables, you may need to adjust or replace them. If the issue is with the clutch dog, cam shift, or reverse gear, you may need to repair or replace those parts. For cable adjustments, refer to the Merc service manuals for guidance.
