dose any one know the answers im looking for

mr elevman · Post by **mr elevman** » Mon Mar 29, 2010 9:19 pm

can you make a rh rotation moter in to a lh rotation moter and is so what needs to be done thanks

MTP · Post by **MTP** » Mon Mar 29, 2010 9:40 pm

I dont believe it would be very easy. Crank gear, camshaft, distributor all would have to be replaced......I guess you could do it

mr elevman · Post by **mr elevman** » Mon Mar 29, 2010 10:02 pm

crank gear??? is the oil pump bi directinal? will the drive gear on the cam mesh ? if not how do you change it ?cranks would be the same firing order for lh is 1-8..and ends on 2 rh is 1-2 and ends on 8 so that is the same you can put the same distribiter on a rh and a lh chrysler thairs no gear on the end of the shaft it mates by post and sockit but theirs a drive gear the drives the oil pump and dist.

prowlersfish · Post by **prowlersfish** » Mon Mar 29, 2010 10:08 pm

also different reamain seal I believe you may have to go from timing chain to gears ( if thats the case the distributor would be the same)

the oil pump is not bi directinal

prowlersfish · Post by **prowlersfish** » Mon Mar 29, 2010 10:13 pm

Are you changing the engine with another one . do you have some good parts from the old one ?

Rodman · Post by **Rodman** » Tue Mar 30, 2010 12:34 am

It seems to me you should change it within the transmission not the engine. Ive never heard of changing the rotation of engine ruining.

alexander38 · Post by **alexander38** » Tue Mar 30, 2010 4:43 am

I want to know Why ?

mr elevman · Post by **mr elevman** » Tue Mar 30, 2010 5:36 am

paul that makes sence gears would change the rot of the cam so the oil pump and dist still turn the same dir but the crank will turn oppisit timeing chain the cam and crank rotate the same timing gears thay rotat oppisit got it

prowlersfish · Post by **prowlersfish** » Tue Mar 30, 2010 6:28 am

Rodman wrote:It seems to me you should change it within the transmission not the engine. Ive never heard of changing the rotation of engine ruining.

thats the way most do it now ( using the trans). But they use to do it with the engine it twin engine boats you would have one engine turning one way and the other turning the opposite direction . in some cases they would even turn one engine around and run off the front of the engine (Chris Craft marine did this) the velvet drive trans would work on both engine rotations with a simple rotation of the pump

Jerry · Post by **Jerry** » Tue Mar 30, 2010 10:49 am

mr elevman wrote:can you make a rh rotation moter in to a lh rotation moter and is so what needs to be done thanks

Yes you can and it is very easy.
Years ago we had to do that with an engine in an old Silverton. The owner just ended up going to a parts store and buying a automotive 318 long block for a dodge truck and it had to be reversed.
All that we did was swap out the cam. We did not change the rear main seal or the timing chain and gears, although I was told that we may have an issue with the rear main seal, as it turned out we did not. They both use the same distributor.
The boat was used for about 10 years before it was sold and the new owner left town with it. The engine held up just fine and never did develop any oil leaks.

Paul · Post by **Paul** » Tue Mar 30, 2010 11:12 am

Jerry,

How can crank turn the opposite direction of the cam without swapping out the chain & sprockets for a set of gears?

Mr Elevman,

One other thing that has to be changed in order to change the rotation of your engine is the position of the starter. It has to crank the engine in the correct direction.

Also, WHY?????

Rodman · Post by **Rodman** » Tue Mar 30, 2010 11:25 am

Let me ask, Can this not be done through the pump and transmission? I think he wants to change the rotation of the prop?

gettaway · Post by **gettaway** » Tue Mar 30, 2010 12:26 pm

check your transmissions, they are most likely RH and LH

wowzer52 · Post by **wowzer52** » Tue Mar 30, 2010 12:50 pm

mr elevman, call this phone number and they will answer all your questions about any marine engine or application, including reverse rotation.
Cook Engine Inc.
503-289-8466
Portland Or.
don't forget the time zone change.

Jerry · Post by **Jerry** » Tue Mar 30, 2010 2:03 pm

Paul wrote:Jerry,

How can crank turn the opposite direction of the cam without swapping out the chain & sprockets for a set of gears?

Mr Elevman,

One other thing that has to be changed in order to change the rotation of your engine is the position of the starter. It has to crank the engine in the correct direction.

Also, WHY?????

Check this out... some very good reading on the matter. I have seen reverse rotation motors with both timing chains or gears.
http://www.scribd.com/doc/27487212/Tech ... s%E2%80%9D
Also, The starter position does not change, only the rotational direction of the starter.

Trojan Boat Forum

dose any one know the answers im looking for

dose any one know the answers im looking for

Re: dose any one know the answers im looking for