tiller98 0 Report post Posted October 20, 2011 i recently purchased an 1992 Monterey 256 with twin 3.0 engines. The right side engine is in real bad shape, so i decide to buy a new one. Are they both std rotation? since i just ordered a new engine and didnt know that with twin engines one can be reverse rotation. Need help newbie here!!! Share this post Link to post Share on other sites
Ian 0 Report post Posted October 24, 2011 i recently purchased an 1992 Monterey 256 with twin 3.0 engines. The right side engine is in real bad shape, so i decide to buy a new one. Are they both std rotation? since i just ordered a new engine and didnt know that with twin engines one can be reverse rotation. Need help newbie here!!! Hi, Generally most twin motor installations rotate in the same direction (left hand a.k.a standard a.k.a conterclockwise). The counter-rotation of props is done by your sterndrives and / or the way you set up linkages. (This depends on the model of your sterndrive) You don't mention what type of sterndrive you have (Alpha, Alpha GenII, Bravo2 or Bravo3) If you are replacing BOTH your engine AND your sterndrive and it is an Alpha drive, you will need to specifcy rotation of the drive BUT this will be part of the model / serial number of the drive Here is a link and extract from a sterndrive company http://www.sterndrives.com/414alphaone.html (make sure you select the correct drive page) Trust this helps some Regards Ian (from sterndrives.com website) A note about ROTATION Do not confuse engine rotation with sterndrive or propeller rotation ALL sterndrive Mercruiser Engines are left hand (standard, counterclockwise) rotation. Most single engine boats use a right-hand rotation drive unit meaning that the propeller rotation is right-hand (standard, clockwise) rotation. Counter rotating drives are left-hand (counter, counterclockwise) propeller rotation. Counter rotating drives have only been around in numbers for the last few years. The advantage of having two drives rotating in opposite directions are increased speed, improved slow and high speed handling, better course tracking, more level ride, improved fuel economy and easier docking. NOT ALL DRIVES CAN COUNTER ROTATE! The drive must be specifically designed to be a counter rotation drive. Attempting to run a standard rotation drive in a counter rotation direction will positively destroy the drive in just a few minutes. In most applications the RH (standard) drive is mounted on the starboard side. The LH (counter rotation) drive is mounted on the port side. The LH drive must have a LH propeller. The LH shift cable must be reversed at the binnacle to pull instead of push for forward gear. Most controls allow for either direction by simply repositioning the cable mounting location and attachment. Always use extreme care when reinstalling the drives that they are properly installed on the correct side or extreme expensive damage will occur. Bravo Drives are bi-directional. Rotation direction is simply determined by the shift cable direction and no damage will take place by reversing the running direction or by installing the Bravo drives on different sides. Again, the RH propeller is usually installed on the starboard side and the LH propeller is usually installed on the port side. Use caution when attempting to operate the boat for the first time after drive, shift cable, or propeller work has been done. Tie the vessel firmly to a strong dock and test the shift for proper direction. Improperly installed props, drives or cables can make the boat go in reverse instead of forward causing severe damage, injury or death. Just check it. Share this post Link to post Share on other sites
