73 merc 1150 help

CharlieB

Vice Admiral
Joined
Apr 10, 2007
Messages
5,617
Re: 73 merc 1150 help

Order up a complete water pump assy WITH lower pump housing.

Oder a gearcase seal kit.

Change the water pump assy and gearcase seals, change oil again soon to flush out the rest of the 'glittery' metal powder.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,994
Re: 73 merc 1150 help

Wave, It is real common for water to get into the gearcase via the drivesahft seal contained in the waterpump base. Metal shavings are also real common in the gearcase. I recommend you abandon your plan to open the gearcase and do further testing to see if it is really necessary. Purchase a new waterpump base and cover, plus an impeller, wearplate and gasket sets. Now sand all the corrosion off the driveshaft and pry out the old waterpump base. Install the pumpbase gasket, with some grease on it. Grease or oil up the driveshaft, oring on the pump base and driveshaft seal in the new pump base. Carefully install the new pump base so as not to tear the new driveshaft seal. Now install the gasket and wearplate. Install the impeller with it's key. install the gasket over the wearplate. Now lube the impeller vanes with oil and while turning the drivesahft CW, install the new waterpump cover. Grease the driveshaft splines and the shift shaft splines, and install the gearcase into the midsection. Gearcase and motor control should be in neutral. Turn the flywheel until the driveshaft splines aline, and line up the shift shaft splines. Wiggle the gearcase into positon, while finger tightening (no wrenches) some nuts to hold it on. When it is all the way mated, you may tighten bolts.

Now refill gearcase with gear oil and test motor on a body of water. If it stays in gear, and the oil remains clear, the motor is good to go.
 

wavebuster1

Seaman
Joined
Apr 19, 2011
Messages
71
Re: 73 merc 1150 help

thank you chris i will try that and pray that is all that is wrong with the bottom end . now is a power head swap as in taking out tha old bad power head removing all the accsesories and putting on a good 1 and reinstalling the accsesories a hard job that should be left to a pro im already having the carbs done by a pro
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,994
Re: 73 merc 1150 help

No, powerhead swap is pretty easy. Remove gearcase and disconnect electrical and control cables. Remove cowling support (6 bolts, 3 nuts). Remove lowest cowl (4 screws), to expose powerhead bolts. Disconnect stator wires, fuel line and starter cable. Remove starter. If you are swapping distributor, remove it, cap and wires(three bolts or nuts in your case, I believe). Now remove all powerhead mounting nuts. There are two in the front that must be partially removed and the block lifted to remove them all the way. Block can be lifted with cable hoist, block and tackle or even brute strength, however, mechanical ways are better as it is clumbsy, a tight fit and must go straight up. You should be able to carry block by yourself, if you are of average strength.
 
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