What Have I Got?

[neches]

I Just Bought An Older Nissan Twin At An Estate Sale,it Runs Out Strong But Wont Idle.i Assume It Is An 18 Or 25 Horse But I Dont Know Where The Serial Numbers Are Located,i Have Looked On The Leg And Powerhead But Found No Tag.could Anybody Tell Me Where Else To Look?this Engine Is Very Strong And Pushes My 12 Foot Jon Very Fast Even With A Bad Prop.

 

[TOHATSU GURU]

Re: What Have I Got?

There is a plate on the side of the engine suport plate.

 

[John_S]

Re: What Have I Got?

I assume it is missing the cowl or has been repainted. The HP is usually prominently displayed there. As Elvin said, there should be a model and serial # plate, unless its been removed or ground down.

BTW, if more than a few knicks in the prop, would recommend changing ASAP. Centrifical forces at high rpms might cause you some pre-mature lower unit problems.

 

[neches]

Re: What Have I Got?

I Have Looked All Over This Motor For Some Kind Of I.d.,found Nothing.i Am Fairly Well Experienced As A Tech.mostly On Omc And Merc But This Is My First Jap Motor.i Was Told When I Bought It That It Might Be A 20 Horse And They Thought It Was A Nissan Which I Was Able To Determine That.it Was Run In Salt Water On The South Texas Coast And The Prop Is Nicked And Worn But Has No Bends Or Breaks.

 

[TOHATSU GURU]

Re: What Have I Got?

Put the engine on a scale and give me the weight.

 

[neches]

Re: What Have I Got?

I Stood It On My Wifes Bathroom Scale,she Aint Happy With Me Right Now,guessing Its Between 130 And 145.i Would Still Would Like To Locate A Serial Number Since Texas Makes You Tittle The Motors As Well As The Boat.

 

[TOHATSU GURU]

Re: What Have I Got?

It's not an 18 as they weigh 98lbs or less. It could be a 25 or 30. They vary in weight from 102 to 119 lbs. Or it could be a 40 as they were between 130 and 145 lbs.

 

[neches]

Re: What Have I Got?

Thanks,could The Numbers On The Carb Give Me A Clue?have It Soaking In Berryman Right Now Since It Was Stored Wet.was Also Wondering What Hubs Will Interchange,was Told It Should Be The Same As A Merc But This Info Is Coming From A Yamaha Dealer.i Have A 19 Pitch 3 Blade Stainless Thats Off A 30 Merc Thats Only Been Wet Once...

 

[TOHATSU GURU]

Re: What Have I Got?

The numbers off the carb are useless. You have to determine what you have before you can go any further.

 

[John_S]

Re: What Have I Got?

Can you post some pictures? Might help. I could tell you if it looks like an 18E or 40C.

For TX title you only need HP, and not a serial #?

Need to ID before talking props, but that Merc wouldn't work on my 40C/boat combo. The standard prop pitch that comes with that motor is around 11". I run props between 11" and 12" pitch.

PS: I just checked my 40C, the serial/model plate is mounted just below the cowling, behind the shift lever. I assume if yours was there, you would have found it.

 

[TGuy]

Re: What Have I Got?

You might also check on the block and look for a number stamped into the powerhead somewhere. Older style motors (sounds like your is), had a 5 digit serial #. Tohatsu/Nissan stamped the 5 digit number into the powerhead. Unfortunately it's in different places on different motors so you'll just have to look all around and see if you can find a 5 digit number stamped into the metal somewhere.

And as tohatsuguru suggested, based on the weight it sounds like it could be a 40hp. How many cylinders (ie: spark plugs) does it have? Tohatsu used to make both a 2cyl. and 3cyl. version of the 40hp. If yours has 3 plugs, then that helps narrow it down.

 

[John_S]

Re: What Have I Got?

"I Just Bought An Older Nissan Twin"

It was easy to miss. A 40D (3cyl) on a 12' jon, that would move along. For that matter, a 40C (twin) would too.

 

[neches]

Re: What Have I Got?

As Soon As I Am Back Walking Again I Think I Am Going To Tear The Powerhead Down And At Least Clean The Block And Rering It.if This Thing Is A 40 I Believe Its A Little More Motor Than My Tracker Should Carry.i Have A Friend Who Is A Tohatsu Dealer In North Texas,says He Can Get The Block Numbers When We Vat It.i Have An Old Quachita Semi-v That Should Carry This Engine Very Well And Safely...

 

[neches]

Re: What Have I Got?

It Is A Twin,seen Lots Of Salt And House Paint.texas Does Require A Serial Number Now On All Motors As Well As The Boat.there Is A Number On The Top Of The Block By The Head,i Assumed It Was A Casting Number But It May Be What I Need,thanks For The Info...

 

[neches]

Re: What Have I Got?

I Have A Number That Was Cast Into The Powerhead.it Is 04-689,is This Any Help?

 

[John_S]

Re: What Have I Got?

I looked on the top of my 40C and found the numbers I believe you are looking at. They were not that legible given the light and my eyes. Mine has 6 numeric digits, no dash "-" or "4" in it. The digits are all "0", "6", "9", or "8", ie numbers that could be read one way or the other. Which side is up?