'88 Suzuki DT75 Lower Unit/Impeller

[yader84]

Hi all,

I'm trying to replace the impeller on an '88 Suzuki DT75. I can get the lower unit separated about an inch and a half to two inches. It will not come completely off.

My questions:

1) I've taken off all the bolts, 9 in all I believe (except the one holding on the trim tab--shouldn't matter). I have taken off the long bolt furthest stern. The lower unit dropped an inch and a half to two inches but will now not come off any further. Do I need to disconnect a shift linkage of a sort or just use more elbow grease? (I read a post about disconnecting the F-R-N linkage on an '86, did my manual just leave out this little detail?)

2) Will the drive shaft come out as well? Could the drive shaft be corroded up top the the crankshaft?

Thanks all for your help, it's much appreciated.

 

[BOAT DOCTOR]

Re: '88 Suzuki DT75 Lower Unit/Impeller

you got to unhook shift shaft under the #3 carb should have 12mm nut on stb side of motor look by shift cable

 

[yader84]

Re: '88 Suzuki DT75 Lower Unit/Impeller

I've got the nut off. What do I do next?? The rod will not pull straight out. It's far too long and the outer casing blocks it from coming out. I've checked the port side and the rod is not accessible.

Now that the nut is off what do I do next?

Thanks.

 

[stylesabu]

Re: '88 Suzuki DT75 Lower Unit/Impeller

ok nut is off, it may help to remove little cotter pin as well. support lower unit, then slide shaft and it should dis engauge shift rod. then lower unit will drop

 

[yader84]

Re: '88 Suzuki DT75 Lower Unit/Impeller

The shaft slides IN. Lower unit disengaged easily. I replaced the impeller gaskets, seals, gear oil, etc.

Now I'm trying to get it back in. It went in just fine, I bolted everything up, hooked up the ear muffs and started the engine. Runs fine. One problem: it's always in gear - forward. N has power. F has more power. R gives it power but the prop does not change direction. I'm thinking I missed hooking up the shift rod.

Anyone have tips on how to seat it properly? What will it feel like?

I owe you a beer.

 

[sturdavj]

Re: '88 Suzuki DT75 Lower Unit/Impeller

On some of the older Suzuki's if you tug to hard on the shift linkage you can dislocate the detent ball from the clutch dog inside the lower unit, not allowing for shifting . Mine is a 1983 DT-50 and it works this way.

To check (without a manual)
1. You can access Browns Point Marina and look up your motor they provide an excellent parts diagram for most Suzuki's.
2. Search this Suzuki forum for lower unit / shift linkage problems

If you did pop your linkage loose you will need two things; available through http://store.brownspoint.com/

1. A SUZUKI SHOP MANUAL for your motor
2. A new set of seals for your drive and prop shaft,

 

[sturdavj]

Re: '88 Suzuki DT75 Lower Unit/Impeller

Yader

I just took a quick look at your motor (look under clutch section in the parts blow up).

And it is possible to pull the shift rod out of postion on this motor, hopefully you did not.

And no I don't work for Browns Point Marine, I have spent some time working on and researching Suzuki's...... plus I'm to Stubborn (or not smart) to give up on my motor

 

[stylesabu]

Re: '88 Suzuki DT75 Lower Unit/Impeller

sorry forgot to tell you the hard part was re-installing lower unit.i did mine 9 months ago so my memory is a little foggy. i loosend the bolts for lower unit so i could move it up and down while i was playing with linkage arm. you will feel it when you get it back in the hole. that's why I removed cotter pin, so I could move shift arm.

 

[yader84]

Re: '88 Suzuki DT75 Lower Unit/Impeller

Got it all together again. For the sake of others I'll post what mine was like. It's an '88 Suzuki DT75.

I learned the hard way that you don't want to take the nut off the rod completely. It is a pain to get back on.

The first time I tried putting the lower unit back on I was not in the right gear. For some reason the lower unit was in forward. It should be in neutral. To get it in neutral I pulled on the shift rod and rotated the prop just a bit until the rod pulled up just a bit. The prop should turn very freely both ways when you're in neutral. From there I put the lower unit back on and held it in place with a few of the bolts. Do not tighten it down yet.

What you want to do is get a flashlight and begin looking for the hook and the shift rod. Follow the hooks arm to the center of the engine. Rotate the hook up and down until you can see it. I say this because my shift rod had to be pushed forward to line up with the hook. Just because the lower unit was on did not mean the shift rod hole and the hook lined up.

I pushed the lower unit most stern portion up and bow end down to angle the shift rod a bit forward. From there I hit the hole with the hook. Be careful to tighten down the nut without pushing the rod in. This will cause the hook to slide out of the hole again.

When you've got everything right the lower unit will not drop out because it's held in place with the hook on the shift rod. Once the nut is tightened down enough so that the hook can not be pushed out of the shift rod hole go ahead and shift through F-N-R and make sure you're properly engaged.

Voila! Tighten the lower unit down and you're set.

Hope this helps someone in the future.

 

[stylesabu]

Re: '88 Suzuki DT75 Lower Unit/Impeller

nice explaination, you moved out of neutral when you dropped lower unit with linkage still attached