70hp 1980 johnson reverse drive

[starcraft69a]

I just bought a lower unit off ebay for my 70hp and it has a reverse drive as in forward is reverse and vice versa. my ? is there a demand for these or am i going to be stuck with a new anchor.

 

[SparkieBoat]

Re: 70hp 1980 johnson reverse drive

you can still use that as long as you get the correct prop for it.

 

[SparkieBoat]

Re: 70hp 1980 johnson reverse drive

thats called "counter rotating" by the way and should have been listed on e-bay as such.

 

[tashasdaddy]

Re: 70hp 1980 johnson reverse drive

what year did the lower come off of. what year is your motor.

sounds like you have a hydro-mechanical lower, replacing a mechanical lower. if so their linkage are totally opposite. you will need the complete linkage off the donor motor.

 

[mikesea]

Re: 70hp 1980 johnson reverse drive

I delete because the experts helped you.i was thinking something totally different.Sorry

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

I have been told that a different prop wont work well because the reverse gear is not made to run full speed like the forward gear

 

[tashasdaddy]

Re: 70hp 1980 johnson reverse drive

you want good advice, give us good info.

what year did the lower come off of. what year is your motor.

or model #. we have no real idea of what you have.

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

I put the year in the title 1980 johnson motor and the out drive is 1980 two i belive. What dose the year have to do with if you can just put a differant prop and run it in reverse at full speed

 

[SparkieBoat]

Re: 70hp 1980 johnson reverse drive

If my guess that it is a counter rotating gear case is correct, it is made to run properly with a counter rotating prop.
If it is a linkage issue as TD mentioned then you need to get the proper linkage or resale and get right case.
As TD mentioned we still do not know exactly what you have, you are just guessing what kind of gearcase you have.
Maybe carry it to someone who knows what to look for and ask a few questions.
If you pull the shift rod up and then turn the drive shaft in the clockwise direction, which way does the prop shaft spin??
Can the guy you bought it from not answer any questions??
just trying to help you figure this out

 

[mikesea]

Re: 70hp 1980 johnson reverse drive

I delete ,the experts chimed in and helped you.I was thinking something different ,and,dont want to leave my post and confuse anyone else.Sorry .

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

Yes it is a counter rotating lower unit. Thank you all for the help I think I am going to just change the prop. The person I bought it from will return it but its all the way accross the USA and I need to get back to fishing. That why I wanted to check on the prop.

 

[Dhadley]

Re: 70hp 1980 johnson reverse drive

It is not a counter rotating gearcase. OMC never made one for a 3 cylinder recreational motor. That's why OMC never made a left hand prop for a 70.

Different years shift opposite of other years. Some pull the shift shaft up for forward, some push the shift rod down for forward. In either case the front gear in the lower unit is forward gear. The gear in the back of the gearcase is reverse. It's a linkage thing.

The gearcase you bought is from an earlier motor All you need is the linkage from an earlier motor.

 

[SparkieBoat]

Re: 70hp 1980 johnson reverse drive

I did see a counter rotating prop for the large gearcase, but not for the small gearcase. Is it possible he has the large gearcase DH??? I was not aware of the linkage change, thats good to know. I generally do not mess with anything past late 80s if I can help it.

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

now im really confused and cant seem to find a prop eather. why dont more people have this problem if its linkage thing. Now I just dont know what to do. ok last ? the shift rod is the same length but when you pull it out they are different lengths

 

[Dhadley]

Re: 70hp 1980 johnson reverse drive

You will not find a left hand prop for that gearcase. Even if you did you'd be running forward on the reverse gear and it won't last very long. Your issue is not finding a prop, you need the powerhead linkage from an earlier motor.

The larger gearcases that do have counter rotating will not bolt up to your midsection. This is not all that uncommon, you just need the right linkage from an earlier powerhead.

 

[tashasdaddy]

Re: 70hp 1980 johnson reverse drive

that is exactly what i said. wrong lower on powerhead.

 

[Dhadley]

Re: 70hp 1980 johnson reverse drive

Not necessairly the "wrong" lower unit. While it's a different style unit it will work just fine as long as the linkage on the powerhead is matched to the lower unit. Or if the cable direction can be changed in the control box, like in an old Morse style box, it will be fine. The cable direction cannot be changed in a typical OMC control.

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

so can any one tell me the part # for both linkages

and why would the lenth of shift rods be different when i remove them the new one is shorter but when installed they look the same

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

ok shift rod size is because the new one is a hydro mecanical. ok now back to the differant linkage can anyone show me two differant ones or part #s

 

[starcraft69a]

Re: 70hp 1980 johnson reverse drive

bump I was really hoping for a part number of two differant linkage I can only find one.