120-140 Mercruser 1970 prop nut torque ?

[1970boat]

I am new to boating and have a 1970 120 hp 140 what ever that means. I noticed today that I had a clicking sound when I rotated the prop by hand, then I noticed that the nut would turn a small distance by hand. I was going to put the air wrench on it but i thought I better ask someone first.

 

[Bondo]

Re: 120-140 Mercruser 1970 prop nut torque ?

Ayuh,...

It should Click, when turned opposite the gear that's engaged,+ Lock solid in the other direction....

The Nut should be torqued to about 50ft.lbs.,+ then locked in place with the bendable tab....

 

[ziggy]

Re: 120-140 Mercruser 1970 prop nut torque ?

I was going to put the air wrench on it but i thought I better ask someone first.

, good idea on asking... 40 ft. lbs. + or - 5 to the lock tab....

 

[1970boat]

Re: 120-140 Mercruser 1970 prop nut torque ?

Thanks for the help, I think you guys just saved me a headache

 

[Bondo]

Re: 120-140 Mercruser 1970 prop nut torque ?

Ayuh,...

If you want to save yourself a Headache,....
Be sure to Slather the propshaft with Grease before you put the prop on the shaft in the 1st place....

 

[1970boat]

Re: 120-140 Mercruser 1970 prop nut torque ?

Regular wheel bearing grease of is there a special type

 

[ziggy]

Re: 120-140 Mercruser 1970 prop nut torque ?

service manual calls for coating the prop shaft splines with perfect seal #4 (C-92-34227-1) whatever that is? i don't know.... i use waterproof grease on mine..... made by polais, .... it's what i have on hand.....

 

[achris]

Re: 120-140 Mercruser 1970 prop nut torque ?

The best is a water proof grease, but as Bondo's signature says

"Any Grease is Better,..... Than No Grease at All......."

 

[1970boat]

Re: 120-140 Mercruser 1970 prop nut torque ?

Great help, should I torque in nutral or put in foward gear? I think I am going to buy a new nut and lock tab as well

 

[Bondo]

Re: 120-140 Mercruser 1970 prop nut torque ?

Ayuh,...

Some fellas like to jam the prop with a block of wood against the Cavplate,...

I just put in Gear.....

 

[achris]

Re: 120-140 Mercruser 1970 prop nut torque ?

Ayuh,...

Some fellas like to jam the prop with a block of wood against the Cavplate,...

I just put in Gear.....

And others like to just hold it with their hands

 

[1970boat]

Re: 120-140 Mercruser 1970 prop nut torque ?

Thanks for all the help , I will ask about electronic ign conversion later.