Nissan 25 hp propshaft install now can't find neutral

[Tcounty]

I just put a new propshaft in, everything went together fine. Now the problem is I have forward, when in (tiller shift lever) neutral it is in reverse and I can't get the shifter to go all the way back into reverse. I can get everything working and shifting smooth ,but when I thighten the 2 blots that hold the end of the propshaft housing on, it starts having the problem above. I have taken this thing apart 10 times and still have this problem. I did not have this problem before. The only reason I changed prop shafts is the splines for the prop were twisted and I had to cut the shaft to get the prop off. All of the gears are fine.

 

[pvanv]

Re: Nissan 25 hp propshaft install now can't find neutral

You did not mention the model.

Sounds like you assembled something wrong when loading the push rod, clutch dog, gears, and associated bits onto the prop shaft. Might have the clutch dog on backwards, too. Sounds like as you tighten the prop shaft housing bolts, the push rod engages reverse. Did you flip the F and R gears accidentally? The 2 gears are different, and not interchangeable.

The shift rod is coupled to the cam rod with a brass coupler and two ss roll pins, so there is no adjustment you have to make to the linkage unless something got bent, which is rare.

 

[Tcounty]

Re: Nissan 25 hp propshaft install now can't find neutral

You did not mention the model.

Sounds like you assembled something wrong when loading the push rod, clutch dog, gears, and associated bits onto the prop shaft. Might have the clutch dog on backwards, too. Sounds like as you tighten the prop shaft housing bolts, the push rod engages reverse. Did you flip the F and R gears accidentally? The 2 gears are different, and not interchangeable.

The shift rod is coupled to the cam rod with a brass coupler and two ss roll pins, so there is no adjustment you have to make to the linkage unless something got bent, which is rare.

It's a 1998 model short shaft 2 stroke. When you say clutch dog do you mean the part the resembles a piston with ears to link into the gear in the foot, held on with a snap ring with a pin? I thought I may have that on backwards ,but it looks (to me ) the same either way you could turn it. Everything slides in fine, I can turn it to get the gears to match and it slides right in. I'll have less than an 1/8" gap at the end of the prop shaft housing , shifter handle works fine F N & R, then when I thigten the bolts the rest of the way I'll have no N. F is there but with the shifter in N it is actualy in R and can't get the shifter to go into R. Thanks for the help on this. I just about lost my mind on this thing yesterday.

 

[Tcounty]

Re: Nissan 25 hp propshaft install now can't find neutral

You did not mention the model.

Sounds like you assembled something wrong when loading the push rod, clutch dog, gears, and associated bits onto the prop shaft. Might have the clutch dog on backwards, too. Sounds like as you tighten the prop shaft housing bolts, the push rod engages reverse. Did you flip the F and R gears accidentally? The 2 gears are different, and not interchangeable.

The shift rod is coupled to the cam rod with a brass coupler and two ss roll pins, so there is no adjustment you have to make to the linkage unless something got bent, which is rare.

I looked at a parts diagram, I think you are talking about the clutch itself. I did'nt pay attention to it when I took it off because it looked the same to me either way you turn it. Does it only go one way?

 

[pvanv]

Re: Nissan 25 hp propshaft install now can't find neutral

I looked at a parts diagram, I think you are talking about the clutch itself. I did'nt pay attention to it when I took it off because it looked the same to me either way you turn it. Does it only go one way?

Right. It only goes one way.

 

[Tcounty]

Re: Nissan 25 hp propshaft install now can't find neutral

Well I turned the clucth around 180 and put everything back on, and still had problems. As I was taking the shaft back out I happened to see my old propshaft on my bench and it looked a little bit different than the new one. Turns out the new one I got is about 1/4" longer than the original. My motor has a break in the serial #, the break is at 50039. It's hard to read the plate on mine, it looked to me to be 50044, but now I'm not so sure about the 44, could be 14 witch is a different shaft. Hopefuly I can return this one for the right one. Thanks for you help. I may decide to keep this motor afterall. If I do keep it, you said you were a dealer, I'll need to go from a short shaft to a long shaft. Can you give me a price?

 

[pvanv]

Re: Nissan 25 hp propshaft install now can't find neutral

Depends on the actual model. What is that? If you have prop shaft 346642116M, Note that the new shaft is all that is available, and must be modified by a machine shop to fit correctly:

/*New longer shaft will only fit 25C2-40911~ and 30A3-030720~- The front will have to be shortened to fit older cases*/

 

[Tcounty]

Re: Nissan 25 hp propshaft install now can't find neutral

Yep ,you hit the nail on the head. That is the part I recieved. My modle is 25c3 ~ 50044. I thought about cutting it with a chop saw, but it would probably be beter to take it to a machine shop. So can you give me a price on the kit to make my short shaft into a long shaft?

 

[pvanv]

Re: Nissan 25 hp propshaft install now can't find neutral

Any 25C3 is newer than any 25C2, so you should have originally had the LU that takes the longer prop shaft. However... considering that LU's could get swapped in 20+ years, and given that you have verified the new shaft is in fact longer, well, yes, you need to shorten it.

Shaft length conversion with new parts on that motor is pretty pricey. Cost of the parts (you need an exhaust housing -- over $500.00 alone, driveshaft -- over $250.00 alone, water tube, and cam rod) would probably be more than the motor is worth. You would probably be better off to trade for a Long shaft motor.