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  1. #1
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    Nut driving me nuts

    HAVE a 1987 220 efi. i lost the lock nut that goes on the stud that holds the throttle cam[black] that moves the rubber roller, opening the shutters. it takes a 3/8 wrfnch. ive tryed 6 or more nuts, none has the correct thread. even robbed fron a 150 carb, no good. could it be metric? sae fine? tryed to find it in linkage tech guide manuals, no luck. engine# ob211002. also the little plastic bushing that slides on first. goin nuts!

  2. #2
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    HeeHee ya need a squirell.....Might be metric......but if it came off with a 3/8 then not....How much bigger was the 150 nut?

  3. #3
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    about the same, but wont thread on. mybe 10/32? if it was bolt, ide just go to hwd. store, but its in the block..

  4. #4
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    If it isn't any of those it has to be......https://www.boltscience.com/pages/screw4.htm
    Outside of nut who cares.... Could be a 2" spanner with a 1/2" hole. Hardware stores usually have a hole and stud size tool set where the nuts and bolts are. Owned a 1984 F250 with a 460cid engine. When replacing the water pump found 1 bolt that was metric. Fun trying to remember the correct hole it went in.
    Gary

    I don't know enough, to leave well enough alone.

  5. #5
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    Is it the same on the 2.5? I have few nuts like that. got a pic of the stud?

  6. #6
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    3/8" wrench size will be either a 10/32 (fine) or 10/24 (coarse), most likely a 10/32 as I have never seen a 10/24 on an outboard.
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

  7. #7
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    Yall all mine is 7/16ths wrench. And looks fine thread. Did u get a odd ball on that stud? The 2.4 and 2.5 carb is same stud. or mite b a carb thang. Have u tried something like a switchbox nut for the connections? I think those 3_8ths mite b standard cant member. If 1 of those nuts would work u could match it up at hardware for 1 way
    Last edited by Merc 2.5; 12-03-2019 at 07:21 PM.

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  9. #8
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    The site I linked to has some very good diagrams with part numbers. Sometimes I order direct, sometimes the shipping is so much I take the part numbers to Ebay. Not sure if this is your motor in the link. If it is not, I am sure you will figure it out.

    http://www.marineengine.com/parts/me...nd-shift-shaft

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  11. #9
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    from old time memory.. if its a 3/8 nut its gonna be 10/32.. if its 7/16 nut its gonna be 1/4 machaine thread.. only metric I remember ona 220 laser is tha two nuts on tha fuel pump stud connections???.. anything different is a screw up....
    Last edited by tlwjkw; 12-04-2019 at 05:53 AM.

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  13. #10
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    3/8" wrench would most likely be 1/4 -20 or 1/4 -28 bolt.
    Measure the diameter, you will know from that measurement what it is.
    Also, make sure the 1st two threads are not burred up or dented.
    hope this helps.
    Last edited by DEN; 12-05-2019 at 09:51 PM. Reason: typo
    If you think this is fun, wait til next weekend!

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  15. #11
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    hummmm,
    Glad I could help!
    If you think this is fun, wait til next weekend!

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