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    ‘91 merc 60hp hitting wot rpm??

    Yes it’s newish to me. Had it about a year now and last season was the same result. Prop is a 13p prop stainless prop. Was thinking about dropping down to an 11p??
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    ‘91 merc 60hp hitting wot rpm??

    Hi all so last weekend I took my 16ft deep v aluminum boat with a 60hp mercury 2 stroke 1991 out on the water. With a full tank of gas and two people boat was hitting 33mph according to my gps on my phone and the rpm gauge was reading 4500rpm at wot. If I’m correct rpm range should be 5000-5500...
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    can you remove the top drain plug screw from a lower unit and re instal it with a new washer ?

    Yeah I doubt it too. Washers would have to be complete junk. Well that gives me better peace of mind
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    Quick silver 90w gear oil okay for 60hp

    Seems as thought they definitely learned something makes much more sense to run gear oil in a front axel rather than hydraulic fluid. I was just concerned about the difference in viscosity but figured running the 90w would just offer more protection rather than more wear on the gears. Thanks for...
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    can you remove the top drain plug screw from a lower unit and re instal it with a new washer ?

    I appreciate the information. I’ve done many lower unit oil changes always with the outboard vertical and always replace my drain plug washers with new ones. In this particular case I just wanted to make sure that this outboard was stored by its previous owner with gear oil and wanted to reuse...
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    Quick silver 90w gear oil okay for 60hp

    I have a 1991 mercury 60hp. Can you use quicksilver 90w gear oil instead of 80w-90?
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    can you remove the top drain plug screw from a lower unit and re instal it with a new washer ?

    Ya I plan on replacing all 3 lower unit washers when I change the gear oil. I just bought this outboard and the seller said he wasn’t sure if he drained the gear oil out or not which confused me so I wanted to check it and at least see if it had oil which it did.
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    can you remove the top drain plug screw from a lower unit and re instal it with a new washer ?

    Ok thanks I just wanted to double check. I just checked a lower unit from the top drain plug screw to see if it had gear oil inside. Planning to just put a new washer on and re install the plug.
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    can you remove the top drain plug screw from a lower unit and re instal it with a new washer ?

    Hi I know this may be a ridiculous question but better safe than sorry. can you remove the top drain plug screw from a lower unit and re install it with a new washer ?
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    ‘91 merc 60hp overheating alarm buzzing

    So it just occurred to me that when I changed the impeller I did more of a quick job and just replaced the impeller and left the current impeller plate gaskets on because I was really just trying to trouble shoot the issue. Pumps water great but if one of the seals is leaking could this lead to...
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    ‘91 merc 60hp overheating alarm buzzing

    So it just occurred to me that I messed up and put that these numbers were after running when in fact they were before running dry cylinder. After running it my numbers were 127 top 131 middle 131 bottom. Seems fine to me.
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    ‘91 merc 60hp overheating alarm buzzing

    So I had a feeling my compression tester wasn’t reading correctly. Bought a new test and tested today (after running for 5 mins) Top- 126 Middle- 130 Bottom-125
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    1991 mercury 60hp clutch problems?

    Ya I was definitely planning to get one and measure the temperatures of each cylinder while letting it idle on the muffs with a hose. Water is definitely cold from hose this time of year so I wouldn’t be surprised if thermostat is even opening even if the block feels hot. Thank you will update...
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    1991 mercury 60hp clutch problems?

    Got it thanks. Well I replaced my therostat and rebuilt poppet valve. After idling on muffs for a while the head seems to get hot. I a, only able to hold a finger on it for a second before it gets to hot. The water comin from the tell is cold?
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    1991 mercury 60hp clutch problems?

    Ah I see I thought it acted like the older style clutch dogs. Also quick question when installing thermostat on these motors does it have to be positioned a certain way when installing I forgot to check mine when I removed it.
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    1991 mercury 60hp clutch problems?

    Yes just confirming that I was reading it correctly thank you
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    ‘91 merc 60hp overheating alarm buzzing

    it’s not looking like it has one just connected to block no head or am I wrong ?
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    ‘91 merc 60hp overheating alarm buzzing

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    1991 mercury 60hp clutch problems?

    So it’s supposed to ratchet when turned clockwise? it locks fine when turned counter clockwise.
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    1991 mercury 60hp clutch problems?

    So today I drained and refilled my lower unit while waiting for parts for another project. Noticed some amounts of metal shavings, not major like shards just more like tiny flakes and only a few. I then tested to see if my clutch was fully engaging. I put the motor in forward full throttle and...
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