If your mount is too worn down to read the stamped number, you will need to calculate the weight of the engine and transmission that you are isolating. You will typically see either a 45, 55, 65, or 75 stamped into the base plate of the marine engine mounts. Metalastik stamps this two digit number on the top of the base plate near one of the mounting holes. Once you have the series of marine engine mount identified, you need to determine the durometer (stiffness of the rubber withing the mount). The standard for the center bolt holes is 12mm for the 17/1600, 16mm for the 17/1609, and 20mm for the 17/1657. There have been special production runs over the years with differing center bolt hole sizes for each of the metalastik cushyfloat series. You can also look at the center bolt hole size on your marine engine mount, but this does not always match perfectly. This is typically the best way to designate which mount you have. Lastly, the 17/1841 is easy to differenciate as it has a four bolt pattern. The 17/1657 cushyfloat series will have a distance of 7.17 inches, or 182 mm. The 17/1609 cushyfloat series will have a distance of 5.51 inches, or 140 mm. The 17/1600 cushyfloat series will have a distance of 3.93 inches, or 100 mm. To determine which size you have, measure the distance between the centers of the bolt holes on the base of the mount. There are four size variations of this standard marine engine mount. If you are replacing a metalastik cushyfloat marine engine mount, there are a few things to look for in helping ensure that you get the right mount. Let us help you in selecting marine engine mounts for your craft. When you think about the value that is riding on a marine engine mount, it is wise to consider doing your homework and finding a vibration isolation solution that is proven in quality and reliability. It is easy to get into the trap of thinking that all marine engine mounts are the same, but that is just not the case. This added thrust on top of the already high vibrations that the engine naturally puts out creates the need for some good vibration isolators. As your craft revs up and takes off across the water, the engine and the vibration isolators that support it undergo a lot of thrust. One thing that is often neglected within the marine industry is the importance of quality marine engine mounts.
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