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    1973 Mercruiser 165hp and MR drive factory parts manual?

    Hi guys, A couple of years back, somebody gave me a link for those 2 manuals. I lost the links. Anybody have the links for those so I can save them in my new computer? Thanks
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    Water when pulling stern drive

    So I winterized my boat and as I was pulling the stern drive, water immediately poured out after I cracked the seal. The bellows look good (I did them a few years ago). The thing that caught my eye was the large round rubber O ring that goes over the ujoint. Assuming the leak was...
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    Recommended fuel for 1973 inline 6

    The boat is running like brand new but one thing has always bothered me since I got it a few years ago (for free…😂. Yeah, right…😩). There is a placard that states “Leaded fuel required. Minimum 93 octane research method”. The engine is a 1973 Mercruiser 250 ci inline 6. All I...
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    Which rear nav light position do I use?

    I have a 1973 18’ I/O. The boat has a two sided white position light. In the “anchor” selection, both sides light up. In the other selection, only the forward lights up. I have found information pertaining to sailboats which discusses masthead lights verses anchor lights. It...
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    Trim tab anode replacement for Mercruiser part number 34127A1?

    I have a high rake prop on my 1973 MC-1 drive so that means the factory trim tab anode (part number 34127A1) does not work with the newer style props. Is there an offset trim tab made for these older drives? Do the Alpha 1 anode trim tabs fit the MC-1?
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    Trouble reinstalling pre-alpha drive

    I pulled my drive to check the bellows job I did last year and to check the impeller. Now I can’t get the drive back on. The pic shows the furthest I can get it which is obviously not even close. What am I doing wrong? It is not a shift shoe issue as I am not even close to those...
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    1973 Mercruiser 165hp sterndrive gasket kit?

    I pulled my drive off to check how well my first bellows replacement job went last year. I am trying to find the correct outdrive gasket kit but all the ones I find are for newer pre Alpha drives. My serial number is 3605794. Aren’t the Mercruiser kits simply “universal” nowadays with...
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    Mercruiser in-line 6 165hp water reversal kit

    I was reading through the archives and stumbled across a post that solved a mystery for me: https://forums.iboats.com/threads/165hp-inline-6-water-flow-reversal-kit-for-exhaust-manifold.613347/ Now I know why my open loop cooling system does not match the Seloc manual. The main cooling...
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    1973 Mercruiser in-line 6 water temp gauge issue

    Hi guys, I recently replaced the water pocket, impeller assembly, lower unit, bellows, upper bellows, water shutter, manifold gasket, elbow gasket, etc. The engine is running much cooler now in the 140 degree range. The water temp reads accurately when the gauge is working. On any...
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    Mercruiser part 27-46401 vs going to NAPA

    My exhaust gasket failed on my Mercruiser 165hp in-line 6 (1973). Can I just get a new gasket for a 1973 Chevy at NAPA or is the Mercruiser gasket specific and required?
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    Last minute question after bellows job and shift cable repair

    Hey guys, I just reinstalled my sterndrive on my 1973 Cobalt. It’s a pre-alpha drive. From what I can tell, it slid on easily. I have the shift feet lined up and they mated properly. I put new gear fluid in via the drain plug until it came out the vent screw. The thing that...
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    1973 pre alpha u joint bellows orientation?

    Hey guys, I’m slowly getting this thing back together. Feels good to finally in the reassembly stage. There are two labels on the u joint bellows. In the pic, it “top forward” on the lip of the bellows. Simple enough except there’s another label that says “top aft” on the other...
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    What is this piece of metal? (1973 Mercruiser pre-alpha bellows job)

    When I took the stern drive off, this piece was laying inside one of the bellows. Any ideas what it is and if it is important? (Glasses for size comparison)
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    Pre-alpha water pump melted. What to check?

    So I’m doing a full service on the back end of the boat with a bellows/transom kit and gimbal housing rebuild on a free boat I was given. The water pump housing was melted. There were pieces of the impeller missing. Besides replacing the entire housing assembly, is there anything...
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    1973 Mercruiser drive 3605797 preload pin or not?

    Hi guys, I’m tearing into a boat for the first time. My exhaust bellows ripped wide open on my free (yeah right) 1973 Cobalt with a 165hp in-line 6. Since I’m going to be doing that, I thought I’d replace all 3 bellows, install a new water pump kit, redo the gimbal housing, change out the...
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