1987 merc 120 - which outdrive and parts.....

[bullelkklr]

Followup to a prev post:<br /><br />1987 Citation<br />Mdl: MCM 2.5 Litre<br />S/N: B554161<br />Mercruiser Drive Unit s/n 0B560318<br />Displacent 153 CID<br />Rated HP: 120<br /><br />I think that this is a MR/Alpha One drive. is this correct?<br /><br />I want to replace the lower drive impeller, exhaust flapper, and put in a new thermostat. <br /><br />I have not pulled it apart yet, but think I should replace the following:<br /><br />Exhaust Bellow o-ring<br />Flapper<br />Lower drive impeller (should I get a kit?)<br />Thermostate<br />Vent/Drain Screw Gasket/o-ring<br /><br />Should I replace other seals while in there?<br /><br />Lastly - How do I make sure that I get the right parts?<br /><br />What are the best vendor's to buy parts on-line from? mercstuff.com - iboats.com ????<br /><br />Please help - I am headed to MT from CO to work on the boat in 1.5 weeks and don't have any parts yet.<br /><br />Are there any other parts that I should look at buying and replacing while I have the lower drive apart? The lower drive oil was milky when I changed it a month ago and it is overheating under a full load scenario (but not on ear muffs).<br /><br />Thanks - <br /><br />Randy

 

[Rhadley]

Re: 1987 merc 120 - which outdrive and parts.....

I have the same engine and maybe outdrive, and am in the process of replacing the flapper also. I did the impeller last year. I would get a kit for the impeller. A good priced store is amarket.com for many parts. If you give them the info above, they can get the right parts. I assume you have the newer version of exhaust pipes/elbow; that would be with the 1-piece elbow and 2 rubber sections. For an exploded diagram go to stemtostern.com, and you can get part numbers as well.<br />Make sure you have a manual before tearing into the work. It's not too bad replacing the impeller; locating some of the lower unit screws is a bit tricky. I took some notes when I did mine if you want me to send them. And I found an error in my manual.<br /><br />Good luck.

 

[bullelkklr]

Re: 1987 merc 120 - which outdrive and parts.....

Thank you very much. I would like the notes - I do have full manuals for the engine and outdrive. They are very thorough. You can email me at rjmoseman@aol.com...let me know if you send an email - I don't check that one very often.<br /><br />Am very interested in the error in your manual.<br /><br />The exhaust on this one is 1 piece metal, two pieces of rubber.<br /><br />Thanx for the links - I will check them out - I printed out about 80 pages of parts listings and pix/diagrams yesterday....I just want some parts for my boat...but I want the right ones.<br /><br />Why doesn't anyone have a sight where you plug in your s/n's and they can tell you the right part numbers?

 

[Don S]

Re: 1987 merc 120 - which outdrive and parts.....

NEVER reuse a gasket or oring of any kind. They are not meant to be re-usable items.<br />If you want to make sure you get the right parts, go to the Mercury Parts Express site<br /> http://www.mercurypartsexpress.com/PartsExpress/HomePage/homepage.asp <br />Then type in your serial numbers. Look up your parts and order them.<br />Now, if you want after market parts, just look up the part numbers at parts express and then order the after market part that is supposed to replace that Merc part number.<br /><br />The other TOOL you will need is the service manual. Get the Mercruiser manuals for your engine and drive. They cost a little more, but they also have the proper information and more of it. Having all the proper parts doesn't help much if you put them together wrong.

 

[bullelkklr]

Re: 1987 merc 120 - which outdrive and parts.....

I do have the merc service manual - thanx for the link I am going to check it out right now.<br /><br />How much cheaper are aftermarket parts? <br /><br />Is the part quality worse?<br /><br />Is it worth the expense to use OEM?

 

[bullelkklr]

Re: 1987 merc 120 - which outdrive and parts.....

So -- When you put in a water pump impeller kit, you always install a new lower seal kit? <br /><br />Shouldn't the impeller kit come with all of the seals that are required?

 

[bullelkklr]

Re: 1987 merc 120 - which outdrive and parts.....

I figured it out by clicking on the individual parts, looking at the diagram, then seeing which parts and pieces are included in the rebuild kits....<br /><br />or at least I think that I figured it out<br /><br />I am going to purchase the water pump rebuild kit part number 46-96148A 8<br /><br />to see if that fixes the overheating problem and the leaks in the lower unit (milky oil). i am hoping that the mechanic that put in the impeller last time simply didn't replace all of the seals that should have been.<br /><br />I haven't found the flapper part number yet, but will look next.<br /><br />That website is great. I had actually found most of the parts I think I need from the aftermarket people....but i am going to buy OEM parts....

 

[bullelkklr]

Re: 1987 merc 120 - which outdrive and parts.....

I cannot find the engine parts (exhaust manifold) - under the dropdown menus??

 

[Rhadley]

Re: 1987 merc 120 - which outdrive and parts.....

The flapper is in the diagrams, PN 60930. You also need the rubber grommet to mount it. I will try to bring in the error info Monday. A buddy and I have had good experiences with amarket, and ebasicpower.com has good prices also. I just ordered the elbow kit,bellows, and flapper parts for $187 including shipping. NAPA often can get you parts also.