70 HP Mercury Force - Lower Unit and QUESTIONS

[sramelyk]

Ok.. First, Mercury Force is just a Mercury motor right? Someone told me it wasn't really Mercury. Second, there is oil leaking slowly from I believe the lower unit.. I have a 1979 80HP Mercury that I just had to replace the water pump on, are the two lower units similar? Reason I ask is that I didn't want to have to go by a manual. Any help would be appreciated.

 

[quantumleap]

Re: 70 HP Mercury Force - Lower Unit and QUESTIONS

No, it's a Force motor made by Merc. after Merc. bought them out. Same old force powerhead design. Lower units are similar, but it's always a good idea to have the manual. If you are going to keep the motor for any length of time you will end up needing it.

 

[JB]

Re: 70 HP Mercury Force - Lower Unit and QUESTIONS

Moving to Force Troubles.

 

[eurolarva]

Re: 70 HP Mercury Force - Lower Unit and QUESTIONS

You may be confusing a lower unit leak with discharge from the exhaust holes in the lower unit. One test is to put some of the stuff on your finger and take a whif. If it smells like gas it is gas oil mix unburned coming out of your exhaust.<br />Test two is to remove your drain plug (about the size of a dime) located near the skeg and drain a couple of drops of lower unit oil. If it is dark or brown it is okay. If water comes out or the oil is milky white you have a leak in the lower unit.<br /><br />It is common to have gas and oil mix coming out of the lower unit. It happens more when trolling and docking which requires low speeds and a rich condition on your carbs.

 

[roscoe]

Re: 70 HP Mercury Force - Lower Unit and QUESTIONS

I believe the 70hp Force/Mercury motor used an older model Mariner/Mercury lower unit.<br />But I can't tell you which will fit. <br />Some had different components ( driveshaft length and water tube ) and gearing.