right or left rotation

captain don · Post by **captain don** » Wed Sep 23, 2009 11:40 pm

After much hesitation I have decided to go ahead and ask what will sound like a dumb question. I am supposed to know these things but sometimes dock talk makes me scratch my head, I do forget now and then. When I bought my F-32 both engines were out. Now that the rebuilding is nearing completion my thoughts are turning to reinstalling them. Reassure me on which engine goes on which side. I thought the standard (right rotation) goes on the starboard side but at least one person disagrees. Thanks Captain Don

alexander38 · Post by **alexander38** » Thu Sep 24, 2009 3:54 am

mine are set up like this, clockwise goes on port side, counter clockwise goes on stbd side. Did anyone mark the props ?

Stripermann2 · Post by **Stripermann2** » Thu Sep 24, 2009 9:50 am

Which motors? My 32 with crusaders has the standard rotation on the port side, counter rotating on the starboard side.

willietrojan · Post by **willietrojan** » Thu Sep 24, 2009 11:51 am

Good reference link

http://www.perfprotech.com/store/articl ... ation.aspx

prowlersfish · Post by **prowlersfish** » Thu Sep 24, 2009 12:58 pm

In most cases the left turn (normal ) goes on the port (left) side and right (rev turn) goes on the right

gjrylands · Post by **gjrylands** » Thu Sep 24, 2009 4:51 pm

The design of the Borg Warner Velvet Drive transmission with a 1.91:1 gear reduction reverses the engine rotation. This results in the standard rotation engine being on the starboard side, and counter rotating engine on the port. This is the case in my F36. It has Chrysler 440's with the 1.91:1 reduction gear.

Danny Bailey · Post by **Danny Bailey** » Thu Sep 24, 2009 8:24 pm

You want the bottom of the props turning towards each other. The 440's I used to have had the counter rotating one to port but like gjrylands said the BW 1.91:1 gears reversed them. My Cummins both turn LH but the STBD transmission reverses the rotation so the bottom of the props turn toward each other. There is less hammering on the bottom and prop walk helps you maneuver better with this configuration

MTP · Post by **MTP** » Sat Sep 26, 2009 8:43 am

seems clear as mud you might do well to consult a service manual or a marine mechanic with knowledge of F32's

prowlersfish · Post by **prowlersfish** » Sat Sep 26, 2009 10:57 am

alexander38 wrote:mine are set up like this, clockwise goes on port side, counter clockwise goes on stbd side. Did anyone mark the props ?

Are you looking at the front engines or the props ? port is normaly C.C. ( but not always )

Eddie-O · Post by **Eddie-O** » Mon Sep 28, 2009 12:09 am

Engine rotation is looking at the engine from the pully end of the engine . prop rotation is looking at the engine from the trans end of the engine. Whitch would make a right hand rotation prop mounted on a left hand turning engine and a left hand rotation prop mounted on a right hand turning engine

prowlersfish · Post by **prowlersfish** » Mon Sep 28, 2009 6:14 am

Eddie-O You are incorrect about that . with a few exceptions I believe Chrysler for some years may have ( can not find anything to suport that) and Detroit diesel had you look at the front . but most(all) other marine were by the fly wheel end.

http://www.boatpartsinfo.com/engine-rotation.html

http://www.ebasicpower.com/faq/rotate.htm

http://www.perfprotech.com/store/articl ... ation.aspx

gjrylands · Post by **gjrylands** » Mon Sep 28, 2009 10:13 am

A simple rule for determining engine rotation is to view the engine from the front. (The pulley side.) Hold your hand up with your thump pointing towards you. Notice the way your fingers rotate around your thumb. Your fingers on your right hand rotate in a clockwise direction, counter clockwise on the left hand. Using your right or left hand, the rotation of the engine will move in a direction that is the same direction your fingers are rotating around your thumb. A standard rotating engine the flywheel rotates in a CCW direction. The pulleys rotate in a CW direction. When using your left hand you will see that your fingers are rotating around your thumb in a clockwise direction, and the engine is a LH, CCW standard rotating engine.

The opposite is true for the reverse rotating engine. It is a RH, CW reverse rotating engine.

Using the same rule go a step further. Determine which prop goes on which shaft. View the shaft from the back of the boat. With the port engine running, and the transmission in forward, the shaft, should be rotating in a CCW direction; starboard in a CW direction. (MOST cases). When using your left hand your fingers are wrapping your thumb in a CCW direction. The right hand prop goes on the port side and left hand prop goes on the starboard side.

prowlersfish · Post by **prowlersfish** » Mon Sep 28, 2009 1:06 pm

gjrylands
You sure know how to make something simple not so simple LOL

if you what to look at the front , then look at the front and rember the back is just the opposet and that what you go by . Easy

LSP · Post by **LSP** » Mon Sep 28, 2009 1:57 pm

lol....

Eddie-O · Post by **Eddie-O** » Mon Sep 28, 2009 10:08 pm

Powlersfish that the way it workes on my twin 360 to keep it simple my starboard prop turns to the right. and my port turn to the left