How do you pull the lower unit of a nassan 70hp outboard to install a new water pump?

Question

i want to change the water pump on my on a

70 hp (70C) nissan outboard motor and i never pulled a lower unit, not sure what to expect thanks for any help

Answer 1

hi you need to get the workshop manual for your motor. You can go to the library I am sure they will have one. The basics though... make sure you have a lower unit gaskey set, a full water pump rebuild kit and the correct impellor.

You need the manual so that you can locate the correct bolts to loosen and the procedure for disconecting the gear shifting mechanism.

With the manual its an easy job.  without..  its kind of pot luck if you have never done it before.  I have changed impellors and water pumps on many different boat motors and i have aways used the manuals. Even now I would still use the manual as a reference to change the impellor and water pump housing in my Johnson even though i have done it before.   The manual will probily cost about $25  but it will save you hundreds in the long run as you will be able to trouble shoot other problems.

Answer 2

((( get a manual))) like has been said ..but here is some genneral proceedure:::://  after loosening the gear case  at the cavitation plate ,,,, pull it away from the leg about half an inch and acsess the gear linkage shift rod and undo the conecting nut,,

then pull the gear housing away -->- ((( when you reinstal it you will have to turn the propelor by hand to push the drive shaft spline into  place )))  --<-  then you will have the pump housing on the gear caseing .. just pull it off the shaft retaining the small key way that turns the impelor.. """::::::: replace the impelor and push the pump housing down over the impelor..,,,,

as you push it down,, turn the propelor by hand so the shaft rotates  and make the fins on the impellor bend away from the shaft ,,, make sure the shaft is turning the correct way ,,with the gear in foward ,, turn the propelor so it drives foward or if in reverse turn the propelor so its driving backwards ,,, there should be a gasket between the pump housing and the gear caseing,, if not ,, use some silastic ,,, ((check the manual)) <<<<<<<<<<<<

Answer 3

I agree with the above post .Get a manual for the motor usualy at any marine shop or west marine is were i found mine at.Basically consists of draining the lower engine lube, taking out the bolts (is where the manuel really comes in handy.)Then removing the lower unit, when you get the impeller our book didnt tell us this ,ut the impeller will be of a larger diameter than the housing, if you take dish soap and apply it to the fins then you can help force it in there , just make sure once it is in ,hat all the fins are being roatated to the same way, either all facing left  or all facing right.The hardest part is just reinstalling and aligning the lower unit shaft back up.Then bolt everything back up and refill the unit with lower unit with engine lube untill it over flows from a hole, agian your book will tell you where to fill it in at and what to look for.Good luck