2004 Nissan N40D2 Question

[LukeFishWalker]

My 2002 Tohatsu M40D2 is a long shaft without a electric starter.
I am going to buy a 2004 Nissan N40D2 with some kind of engine issue.
The Nissan is a short shaft electric start.
All I really need is the lower half and the starter " Kit " parts to put on mine.

The owner said he bought the Nissan N40D2 and was planning to re-sell it for a profit.
But, after getting it home it really never ran correctly.
He's come to the conclusion that the crank may have been twisted.
It has good compression (130psi) on all 3 cylinders.
Is there a sure fire method of determining if in fact the crank has been affected buy a sudden
stop or over-reving without tearing it apart and having the crank checked?

Thank You For Your Time And Efforts,
Lukus

 

[pvanv]

Twists are rare. Typically caused by severe over-revving. With the head off, you can use a dial indicator to verify TDC for each cylinder is exactly 120 degrees apart.

 

[LukeFishWalker]

Thank You Paul, I appreciate your advice.
After taking a beating on a M40D last year, I'm having a hard time justifying this purchase.
But, a starter kit is in the $900 range and the short shaft assembly I "Want" need for my
short transom is kind of hard to find. Here in Louisiana boaters often fish in shallow water.
The guy wants $1000.00 US for this outboard.
Give me your opinion, is that amount fair for an outboard with a possible engine issue?

Thank You For Your Time And Efforts,
Lukus

 

[pvanv]

Hmm. 15 yo motor that has seen salt. And probably doesn't run correctly. I don't think I'd spend a grand on it.

 

[LukeFishWalker]

Thank You Paul,
I appreciate your honesty.

Thank You For Your Time And Patience,
Lukus

 

[LukeFishWalker]

Paul, I hate to ask once again for your advice.
I found a local guy with a M25D that he wants to sell for $650.00 USD.
He tells me that he repaired the engine with the original crank and a M40D block.
He says it has a clicking/ticking sound near the lower cylinder.
The only reason he did any repair was the fact the exhaust cooling chamber was compromised
by a pin hole which allowed water into the lower cylinder of the original cylinder block.
Of course, when he attempted to take the bolts out all the bolts broke and it was then he
realized that his factory M25D block had salt water damage beyond repair.

It's been my experience that once water has been allowed to contact internal moving parts
of ANY engine, the affected parts need to be either replaced or use a rebuilt component.
Here's what I think:
The lower main bearing or the wrist pin bearing of the #3 cylinder had water damage
and when he put it back inside the replacement block, there is now wear causing the clicking/ticking.
Which has possibly ruined the crankshaft assembly. The block is likely still ok as long as the
cylinder walls have not be affected by rust or contaminants.

He does have a variety of additional parts to go with this outboard.
In addition to the M25D being Tiller, short shaft and electric start (Which is what I want/need)
he also has an extra cylinder head, starter and ignition parts along with the damaged M25D block.

In your opinion, is the M25D described above worth $650.00 USD?

I plan to put my working M40D2 powerhead on the lower half of the M25D.
And, keep my lower M40D2 unit in case of future repairs.

Thank You For Your Time And Patience,
Lukus

Edit:
Based on what I've described, are these the parts I need?
3C8013030 Engine Base Gasket
Lower Head Crank Case seals and O-Ring
346012160 O-Ring
334001220 Oil Seal
3c8012150 Oil Seal

And of course I plan to change the impeller and inspect the pump housing.
Could you recommend any additional parts to change before assembly?

 

[pvanv]

Lukus,

Something is really wrong with his story.
The 25D is a 2-cylinder, while the 40D is a 3-cylinder.
Blocks do not interchange.
If there was a bad wrist bearing, it should have been replaced when everything was apart; main bearings are not serviceable aside from installing a crank kit,
Lower units do not interchange.

Something really bogus here.

 

[LukeFishWalker]

It would appear that I've made a slight PhoughPaux.
I was mistaken when I described the engine I am going to get.
It's a 1993 or 1994 Tohatsu Mega 3 cylinder.
All along I thought the model number was M25D.
I'm sorry for the mistake.

 

[pvanv]

There was an M25D in short only, over 20 years ago. It was the same displacement as the 40D. There are no US parts catalogs for it. You might get lucky by checking with Elvin at Solution One in Tampa. As for value, considering that the motor was probably from 1992 or so, it's well over 20 years old, has mechanical damage, and has run in salt... so it has almost no value as a motor in and of itself. If it has the parts you want for your other motor, only you can decide whether the price is worth those parts.

 

[LukeFishWalker]

I was able to offer him $450.00 USD and he agreed.
Now I have a project.
I will try to post pictures of the progress.