Engine rotation problem

[johnbhite]

Hello all,

I am a fairly savy boat mechanic, but just came across an issue I have never delt with before. My brother just purchased a 1996 sea ray 300 dancer with twin 5.7 V drives. He got a pretty good deal, only $19000, but both engine blocks were cracked. So we decided to build two 383's with roller cams. Just got done with them and started transfering all the accessories, port side engine went flawless, all ready to put in, but as we started tearing down the starboard engine, we noticed when we removed the timing chain cover that there were a set of gears on the cam and crank which means this one is reverse rotation. The problem is finding a roller cam for this configuration. I am wondering if it is possible to change the rotation of the V drive. The drives are Borg Warner velvet V drives

Thanks

John

 

[Bt Doctur]

Re: Engine rotation problem

I believe Velvet drive rotation is determined by the front pump assembly.

 

[chriscraft31]

Re: Engine rotation problem

The velvet drive rotation cannot be changed, Bt is correct, the rotation of the transmission is determined by the pump. You need Hurth v-drives, they are a full power reversing transmission. This means you can run them in forward or reverse at nearly the same ratio. These are commonly used in diesel applications where you cant reverse the rotation of the engine itself.

 

[Bt Doctur]

Re: Engine rotation problem

just to clarify, the borg warner transmission can be made to run on R.H. or L.H. engines, but cannot be altered to run in either direction regardless of engine rotation. it will turn in one direction only, depending on engine rotation.

 

[chriscraft31]

Re: Engine rotation problem

That is correct Bt, by swapping the pump it can be reversed, but clockwise in is clockwise out.... counterclockwise in is counterclockwise out.