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  1. W

    low water pressure in 80hp merc

    g'day mate's<br /><br />go my 1971 merc 800 thunderbolt back from the mechs after it swollowed a bolt from one of the reed banks into No.3 piston (messy!!! new piston and rings)and thought that I would fit a water pressure gauge .no probs there was a fitting at the back of the mottor between...
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    just to lighten thing up a bit

    REAL TRUTHS ABOUT LIFE, THAT LITTLE CHILDREN HAVE LEARNED:<br />1) No matter how hard you try, you can't baptise cats.<br />2) When your Mom is mad at your Dad, don't let her brush your hair.<br />3) If your sister hits you, don't hit her back. They always catch the second person.<br />4) Never...
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    Santa clause

    SANTA CLAUS - - - - - - - - - - - - AN ENGINEER'S PERSPECTIVE<br />OR — THERE’S ALWAYS SOMEBODY WHO WANTS TO MUCK THINGS UP.<br /><br />[I] There are approximately two billion children (persons under 18) in the<br />world, however since Santa does not visit children of Muslim, Hindu, Jewish<br...
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    this is interesting

    It is time to elect a new world leader, and your vote counts. Here are the facts about the three leading candidates: CANDIDATE A, B or C?<br />> > ><br />> > > Candidate A:<br />> > > Associates with crooked politicians, and consults with astrologists.<br />> > > He's had two mistresses. He also...
  5. W

    anyone know about harmonic vibrations

    g'day mate's<br /><br />got this 73 80hp merc thunderbolt that broke a bolt that holds the reeds onto the crank and proceeded to eat it (not good)<br /><br />My mech said that this was probly harmonic vibrations <br /><br />My Q is what do you do to stop it or avoid it<br /><br />cheers daryl
  6. W

    harmonic vibration

    g'day mate's<br /><br />this is a repeat of an earlier post just this time I got the spelling right (I think)<br /><br />EDIT: Go back to your original post, click on EDIT and make your changes there.<br /><br />Good luck. JB
  7. W

    harmonic vibration

    g'day mate's<br /><br />I've got 1973 80hp mercury just fitted to my 16ft f/g boat and did about 3 or 4 hours and it broke one of the bolts that holds the reeds to the crank and than proceeded to swollow it(not pretty) Any way my mech. said that harmonic vibration would cause this! dose this...
  8. W

    73 80hp merc swollowed a bolt

    G'day mate's <br /><br />been away fishin for a week out at lake kepit ( Northern N.S.W australia) the first two day were great no probs.Then comein back to camp one morring crusin at about 32 mile/hour (just off WOT) and it all happened the motor gave a surge and then a horrifying rattle and...
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    down size my prop?

    g'day mate's<br /><br />got my boat going with the old merc (73 80 hp)on the week end and goes prety good with a smaller load(35 miles per hour) but really struggles to pull up a skier.<br />the boats a bell boy 16 ft f/g deep hull 1962(prety heavy) the prop that came with the motor is a 13"X...
  10. W

    should I install water presure gauge

    g'day mate's<br /><br />got my old 73 80hp mercury fitted and took it out for run on the local lake and it goes great<br />pulls about 35 miles per hour on my 16 footer(heavy boat) even pulled up a skier,just (big bloke thougth 240 pound 6 foot 6 inchers) <br /><br />just got two questions <br...
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    mercury tacho

    g'day mate's<br /><br />just bought a 1973 80hp merc (800 cc thunder bolt) and the bloke in the shop said I needed to buy a ridgy didg mercury tacho as others (brands) wont fit<br />my question is is he fair dinkem or does he just want to sell me a new one ( at $400 australian dollar [$200...
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    1973 80hp merc water presure

    g'day mate's<br /><br />just a quicky<br /> what water presure should I expect out of this old darling and do these old girl have a higher compession than other makes and models (i've just bought her )<br />shes runing 152psi in no.1 <br />150psi in no.2<br />153 psi in no. 3<br />155 psi in no...
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    1964 75hp Johnny

    Hi everyone<br /><br />Need to know the dry weight of this old girl if anyone would be kind enough to let me know<br />I've just taken off my 16 footer and replaced with 1973 80hp merc. I was wanting to know the difference in weight please?<br />Cheers<br />Daryl
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    OutboardJim

    g'day Jim mate <br /> yer I think that is a great slab of dirt to (down under) and reckon youd be wellcom back any day mate <br /><br />cheers daryl<br /><br />ps always abit keen on USA myself<br /><br />pps sorry adout using this forum for this just had to say something.
  15. W

    specs on 1973 80hp merc

    is there a web site that will give me the specs on this out board eg weight fuel econ type gearing used in LU etc.etc...
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    what tacho would be best

    hi and happy new year to ya<br /> I'll need to get a tacho to fit to my boat as i am up datting my motor and will need to see if the prop is the right one etc. etc. and was wanting to know what make and model would be best. The motor is 1973 80hp merc (4cyl inline)<br />going onto an old boat(...
  17. W

    what prop would suit

    I am just in the middle of changing the motor on my 1962 16ft bell boy f/g boat from 1963 75hp johnson to a 1973 80hp merc and was hopen some one may be able to surgest a prop that will give me an all round preformance(mainly use the boat for fishing but the kids like to use a ski biscut)<br...
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    1964 75hp Johnson Help needed

    This motor has an overheating problem dont know much about it. It idle well run well until it gets hot(how do I get to the water pump). Any help greatly appreciated.<br />Cheers Fisher
  19. W

    1973 80hp mercury any good?

    was thinking of buying one and was wondering is there any thing I should look for and what should the compression test read etc.etc.
  20. W

    1973 80hp mercury

    I've heard that this motor has a plain steel shaft (not stainless steel) and is prone to rusting is this true :confused:
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