Technical Guide for an Underwater Propeller Repair


A propeller is an important part of the boat. It increases the overall performance and extends the engine lifetime. Normally, a propeller damages when they hit an obstacle. Whenever you take the boat out on the water carry a spare propeller with their required tools. The boaters must learn the basics of the propeller and able to replace the propeller in case of emergency. A certified propeller repair technician has the ability to work with design, manufacturing, developing, testing and support.

Propeller Hub
The general defect occurred from a propeller hub is slipping. Using a slipping hub affects the rotation speed of propeller and simultaneously the speed of the boat decreases. To repair the hub, look for deviations and fit in the same line where the propeller housing ends.

Diameter - The diameter of the hub varies from 0.20 to 0.25 inch and it is bolted with the tailshaft present at the flanged end.

Level of oil - To prevent the leakage of water into the hub, it is filled with pressurised oil. Therefore the pressure occurs inside the hub is higher than outside. The oil level should be constantly noted and when decreases it should be refilled. The pressurised oil saved in the gravity tank located above the water line.
Image result for underwater propeller repair

Propeller Balance
After finishing all repairing works, propeller balancing is must and it should be done only by a certified technician. It will reduce or completely eliminates the vibration occurs in the propeller. If the propeller is not balanced properly, it will put the engine and the propeller at risk. Propeller balancing is of two steps.

Horizontal balancing - To obtain horizontal balance, a coaxial hole is drilled at the end of the blades. The lead is added from one end through these holes and joined in the other end. The size of the hole in both ends should be the same.

Vertical balancing - To obtain vertical balance, an eccentric hole is drilled near the external blade surface. The size of the hole can be a maximum of 1 inch in diameter.

Repairing a Propeller at Emergency Situations
When a propeller hits an obstacle and the boat stop running, the old propeller must be replaced with a spare propeller. For that, carefully loosen the nuts using the screwdriver and remove the old propeller. Place the new spare propeller by reversing the same process and recheck all the nuts fitted and tightened. This process is only for emergency purposes to get back the boat immediately to the nearest shore. When reached the shore, get help from some technician to repair it completely.

Repairing a boat propeller with a certified technician can save time and cost low. They will do their job better because they are already undergone and experienced similar or the same problems and have special tools to work in the task. Repairing yourself, the propeller may ends in the same repair again and one needs to spend extra cost to get repaired it again.

Comments

Post a Comment

Popular posts from this blog

Things to know before selecting commercial diving as your profession

Image
Every individual has the dream to change their favourite hobby as their career. This concept sounds perfect sense but in default you have to start improving your skills in your earlier stage of your career. Nowadays, people who love diving wants to continue as a professional diver. The professional divers are the ones who not only depend on great physical strength and also have fearless attitude in tough situations. There are lot of different fields in commercial diving following are the important points to know before getting into it. Recreational Diving: A qualified diving instructor will be eligible for recreational diving. These recreational diving is one of the big businesses; it makes the diver to work in any part of the world. In recreational diving your workplace will base upon some holiday resorts and tourists spots. In recreational diving there will be no challenging work related to your physical and mental fitness. Recreational diver is responsible for everyone’s
Read more

How to choose the Best Bottom Paint For Your Boat

Image
Bottom paint is applied below the waterline on your boat, and typically refers to antifouling paint that prevents marine growth from clinging to your hull. Antifouling paint forbids aquatic growth such as barnacles, mussels, and sometimes oysters, and plant growth from attaching to your trawler. Most antifouling paints use the diffusion of metallic elements within the paint to halt these foul critters from bonding. With all the different bottom paints out there, it’s hard to choose which is best for your boat. It seems like every manufacturer has something which in their opinion makes them better than the other guys. Not only that, but even different product lines by the same manufacturer can seem to contradict each other, each one claiming to be the best for your boat. So here are some types of paints which can be best suitable and reliable. But there are many factors to consider before you get the perfect paint for each boat and it differs depending upon the requirement. Type of
Read more

How to change boat propeller by yourself

Image
  The propeller is one of the most important and vulnerable parts of the boat engine. And it is more prone to failure and repairs with time being. Being a boat owner you might a come through a point where you had an emergency of changing the boat propeller which is necessary at the failure. That’s why it is advised to the boat owners to have a spare or extra propeller to avoid problems and emergencies. Either the propeller needs to be changed during an emergency or when you take it out after months of storage in winter when the parts are jammed. In both cases, you will have to change the propeller and for this, you must know how a propeller is changed or replaced. Changing a boat propeller is not a tough task and here are some of the tips and techniques which can be used to help in shifting the propeller and installing a new one. You don’t need to buy a different set of equipment to use for this work. Your car tools can be accomplished to change the propeller, which usually has all
Read more