Terribly stoopid question

[Gerkin]

So I am now at the point where I need to install twin engines in the Donzi.
The engines have been out for over a year now, and I am super embarrassed to even ask this question.
Now that they have been rebuilt and look identical, I have a standard rotation and a reverse rotation. Does the reverse rotation go on the left or the right?
This is a Vdrive boat.
When pulled, I put a p and an S on the oil pan to distinguish. The oil pans along with the whole engines are painted. I do however know which engine is which. Just don't remember where they go in the boat
Thank you all with a tail between my legs

 

[alldodge]

Unless your boat is real old they are both standard rotation. The drives or trans does the changing of rotation

What year is the boat and what motors?

 

[Scott Danforth]

confirm by the tag on the transmissions that you do have a RH and LH motor.

Port prop is normally a LH prop and Starboard is a RH. with old gear, the revers rotation (RH) would go on the starboard side

 

[Bondo]

So I am now at the point where I need to install twin engines in the Donzi.
The engines have been out for over a year now, and I am super embarrassed to even ask this question.
Now that they have been rebuilt and look identical, I have a standard rotation and a reverse rotation. Does the reverse rotation go on the left or the right?
This is a Vdrive boat.
When pulled, I put a p and an S on the oil pan to distinguish. The oil pans along with the whole engines are painted. I do however know which engine is which. Just don't remember where they go in the boat
Thank you all with a tail between my legs

Ayuh,...... What are the motors,..??

 

[Gerkin]

Its a 1968 Donzi 28
454 7.4L
I have the tags on the motors that shows that they are standard and reverse rotation. The motors are not original to the boat. They are 1986 engines.
Mine is not the one pictured, but I wish

 

[tank1949]

Unless your boat is real old they are both standard rotation. The drives or trans does the changing of rotation

What year is the boat and what motors?

I owned an old Penn Yann whose opposite rotation was in the 351 Windsor Ford stb motor. A nightmare!

 

[alldodge]

Its a 1968 Donzi 28
454 7.4L
I have the tags on the motors that shows that they are standard and reverse rotation. The motors are not original to the boat. They are 1986 engines.
Mine is not the one pictured, but I wish

Thanks that helps
Go to distributor and trace the plug wires

 

[tank1949]

Thanks that helps
Go to distributor and trace the plug wires

View attachment 400197

My MC's opposite rotation is in OD, not motor. However, my MC manual displays 350 Chevy motor with same firing order but #1 is where #6 is located. I don't know why MC did this unless distributor body bumped up against something if it were located where GM says it is supposed to be. My Chevy truck manual displays #1 like photo.

 

[alldodge]

Special Note
Number 1 can be anywhere on the distributor

Bring up number 1 cylinder to TDC and where ever the rotor points is No 1 position. If someone wants it to be somewhere else, all they do is pick the dizzy up, rotate a bit, and sit back down. The key is the firing order

 

[Gerkin]

Unfortunately, the distributors were removed prior to my purchasing it.

 

[Scott Danforth]

Only other easy way. Using a prybar on the flywheel or proper crank snout socket, turn the motor over while looking at the cam thru the distributor hole

DO NOT turn the crank from the crank bolt

As you turn the crank, the motor that the cam turns the same direction is the motor that is the LH motor. The motor that the cam turns the opposite of the crank is the RH motor.

 

[kenny nunez]

Also be sure that you have the correct rotation starter on the same rotation engine.
Make sure that both engines are running correctly before installing them in the boat.

 

[Gerkin]

I don't really have a way to run them on the hard. The starter is attached to bellhousing inside the boat.
So I know which engine is which. That part I do know. It is which engine goes on the port and which goes on the Starboard side

 

[Scott06]

I don't really have a way to run them on the hard. The starter is attached to bellhousing inside the boat.
So I know which engine is which. That part I do know. It is which engine goes on the port and which goes on the Starboard side

I would find a way. I screwed my engine to a pallet hooked up a battery via some old cables, you can hot wire it at the cannon plug, put the fuel line in a small gas tank. if there are any leaks now is the time to find out.

Was work done to the engines while they were out ?

 

[alldodge]

Lets think about this a bit more
Start a standard rotation motor in reverse, or a reverse rotation motor standard????

That's really what were talking about, because we don't know which is which, and I wouldn't try that

Something I just don't understand, is why motors were rebuilt and one "should" be RH and the other LH. So what kind of shop does this and does not indicate which is which. Then I come back to maybe because both are LH motors and they just changed the cam.

Then one would ask if that did happen was it just a misunderstanding, or something else

 

[alldodge]

I just found a easy way to tell if it's LH or RH. According to Melling (oil pump manufacturer).

both the distributor and oil pump turn the same direction regardless of the crank rotation.

So the Dizzy gear and Cam gear must mesh so there is a downward pressure placed on the Dizzy gear to keep it held down. So look down thru the intake hole where the Dizzy goes and is the cam shaft gear done different from the other.

Melling

 

[kenny nunez]

The flywheel housings are usually bolted to the “V” drives with 6 bolts if my memory is correct. If so then you will be able to start them and make all the adjustments before installing them.
I always ran every engine on the hard before installing them so that if there were any leaks or any other problems I could address it.
Follow AD’s lead to ascertain L & R first.

 

[Gerkin]

So I will fill in some more info on the situation.
We have always known that one is reverse and one is standard. The reverse has a timing gear and the standard has a chain. The reverse has a front seal that pushes the oil in and not out. I just simply forgot where they went in the boat now that they have been rebuilt, painted, and put back together.
The boat sank before we bought it. The starters are shot. After doing some serious sleuthing, through old pics etc... I was able to confirm that the Reverse rotation goes to the starboard side of the boat.
This project started as a basket case and we are doing or best to get it back together.

 

[Scott Danforth]

its the crank knurling that guides the oil on the seals on a 2-piece RMS crank

Side note - Bud of mine received a RH crank once by accident and could not keep the mains from leaking. we discovered on tear down. Machine shop did the work to swap the crank and covered the bearings/gaskets but not the motor R&R

post #3 covered which side the reverse rotation motor was installed on.

base on post #18, do you know which motor is RH and which is LH, or are you still trying to determine? if you are still trying to determine, see post #11

 

[Gerkin]

Yeah, I was not sure if that setup from post #3 was standard or not. Looks like I am all set. Thank you all for your help.