Logo
FULL SITE MENU

Mariner 99 HP

Y

yelleroses

New member
"I have a mariner OB, 9.9 HP w

"I have a mariner OB, 9.9 HP with a serial number OD087848. Can anyone lead me to a site to determine the year a specs of this motor? It was only used 3 times and has been in high and dry storage. Thank you."
 
"Gary, that is a 1992 Mercury

"Gary, that is a 1992 Mercury built Mariner (so just a 9.9 Merc with different paint/decals).

Great little motors (own 2 of them). Don't jigger it up in a rush to get her going.

Change the impeller and gear oil - make sure she will turn over ok by hand (just rotate the flywheel with the plugs out) - if all feels good then put about a teaspoon of outboard oil in each cylinder (or spray in some fogging oil) and get them lubed up.

A new set of sparkplugs wouldn't hurt either and then try to fire it up.

Not much can go wrong with these, so a minimal bit of prep will ensure that you don't toast something the first time you get her running..."
 
"hi everybody,

just wondere

"hi everybody,

just wondered if anybody could help!! my engine is a mercury 9.9 hp 1987 model. it works fine going forward and in neutral, but when i put it in reverse it makes the right sound and everything but its not making the prop spin fast enough!!!

please please please can anybody help!!!!"
 
"Richard,

A few questions t

"Richard,

A few questions that might help us troubleshoot.

Does the motor have shift controls at the motor side/tiller handle, or in the remote control handle?

Is this a new problem that has arrived suddenly, or a feature of a recently acquired motor? In other words, has it worked OK before?

When you refer to the "right sound", do you mean that you are gaining revs as you throttle up in reverse? Or that you can hear the reverse gear engage but can't get enough throttle in reverse?

As for "not making the prop spin fast enough", when you shift into reverse, does the prop start turning backwards (counterclockwise) at all, or does it still turn the same way as in neutral (the prop typically rotates slowly clockwise even when in neutral). Can you drive the boat in reverse at all?"
 
"hi tom,
many thank for your

"hi tom,
many thank for your reply. ill try my best to answer your questions.

iv had the engine a few years now and it as always worked in reverse. i had problems with it not starting so i replaced the cdi unit and neutral switch and it seems to start and run fine (apart from the reverse problem)

it dosent have a tiller handle it has a throttle next to the steering wheel - if that makes sense!

the sound i can hear is it building revs, it gets louder like it should do but it just wont reverse at all!!

im unsure about the prop, my grandfather said it was turning couterclockwise, but im not sure he could see it clearly.

sorry about my answers, i know nothing about engines


thanks again"
 
"No worries, I'm not a pro

"No worries, I'm not a pro expert like some of the senior guys around here, but have done a fair bit of tinkering on a couple of 15hp's which are basically the same engine as yours (I think).

Sounds to me like the outboard is not actually shifting into reverse. Though if the prop actually is turning CCW even though the engine is revving up, then I must confess I'm a bit mystified. Do you hear and feel a definite "clunk" when you shift into reverse, similar to when going from neutral to forward?

I suppose the shift/throttle cables or their linkages at the engine might be somehow out of adjustment. The throttle handle next to the wheel will have 2 cables coming out, one of which is the throttle and one of which is the shift cable. These connect to some cams and levers at the engine end, and if the adjustments are out by even a few millimeters, the shifting won't work properly (struggled with this for about a year on my engine).

Just to make sure we're talking about the same thing, can you post your serial number so we can get to the right parts diagrams? Does your engine look the same as this, particularly in the highlighted components?

294604.jpg
Mercury 15hp linkages
 
"the Serial number is: 9476539

"the Serial number is: 9476539
i dont 100% believe my grandfather when he said it is turning ccw, i will have to check my self and let you know.
iv had the lid off the engine and have moved the throttle forward and backwards and it seems to move the correct components inside the engine.

i dont think i did hear a clunk sound, just the sound of the engine getting louder, it works perfect going forward.

my engine looks a little bit like yours, it has the two linkage cables coming into it like yours does.

would you mind sending me you email address so i can contact you tomorrow when iv had a second look, ill take a pic too.

mines: [email protected]

regards"
 
"OK, I think the parts diagram

"OK, I think the parts diagrams for your engine are these: http://www.crowleymarine.com/mercury_parts/496.cfm

Looks pretty much identical to what I'm used to seeing so the parts & adjustments are probably the same, but do have a look at your motor anyway.

Probably the first thing I'd do is disconnect the shift cable from the engine and see if you can shift into reverse manually by moving the lever that the cable connects to (officially I think you're not supposed to do this with the engine not running, but often there seems to be no way of avoiding it).

The shift cable is the lower one, not visible in the pic above. Just make sure you don't drop the cable locking collar overboard - it will fall off the cable end once disconnected (don't ask how I know).
wink.gif


With the shift cable disconnected, you could use the throttle handle to set the engine to idle and then shift manually by pushing the lever front (Forward) or towards the rear (Reverse). You can tell when it's in neutral from the fact that the little ratchet-type lever at the corner of the starter housing swings out to allow the manual starter to be used.

Once in reverse, add a bit of throttle from the handle and see if you can drive backwards. If this works OK then I'd suspect a problem somewhere in the link adjustments, control cables or even the throttle/shift handle.

I'll email you a section from my official Mercury electronic service manual (the aftermarket Clymer/Seloc shop manuals are otherwise excellent but unfortunately have nothing to say about control cable attachments). If the shifting works without the shift cable as described above, then as a next step you could check that the adjustments are as specified.

Note, however, that the manual is officially for slightly newer model year range, so don't sue me if something goes awry...
happy.gif
My e-mail can be found in the profile link to the left.

Cheers"
 
"hi tom,
>
> sorry a

"hi tom,
>
> sorry about my late reply, i havnt had chance to visit my boat in
> over a week!!!
>
> iv wrote down below what i did today, i hope it makes sense, i did
> what you suggested but still no luck im a affraid!!
>
>
> what i did today:
>
> 1 disconnected the linkage from the remote throttle.
>
> 2 pushed the clutch lever by hand into reverse (clunked sound was
> heard), when I did this the prop started turning anti-clockwise very
> slowly (the prop didn’t move in neutral at all)
>
> 3 pushed the acceleration lever by hand, the engine built up revs
> and the water started bubbling but the prop defo neverspeeded up and
> continued to turn anti-clockwise very slowly.
>
> 4 pushed the clutch lever by hand into forward gear, then applied
> acceleration by hand and the boat started to move forward ( this
> seems to be working fine)
>
> hope you can help
>
> kind regards
>
> richard"
 
"Hi, no worries, have suffered

"Hi, no worries, have suffered from similar withdrawal symptoms myself recently...


I must admit that I'm a bit mystified, not sure what could be wrong. Clearly it sounds like it's shifting correctly between the gears, but it's strange that it works differently between forward and reverse.

I've sometimes had a slightly similar problem with a propeller hub that was worn out and slipping (there's a rubber grommet in the hub which lets the prop slip if hitting a rock, thus protecting the propshaft & gears). In that case, the boat also moves very slowly even though the motor is revving like mad. However, if this were the case then one would expect the same problem to occur in both forward and reverse. Weird.

In any case, might be worthwhile just to check the prop hub for slippage, you can do this by unscrewing the prop nut and making an index mark across the splined metal hub and prop itself with a waterproof marker. See below for an example.

294892.jpg
Propeller hub mark"">

Then reinstall the nut, run the engine to recreate the problem, and then recheck the mark. If it's still aligned, the problem is elsewhere - if not, you've found your culprit.

Just be sure to disconnect the plugs and/or set the kill switch to off when working on the prop so you don't accidentally crank the engine and start it..."
 
"Richard, if I can jump in and

"Richard, if I can jump in and make a suggestion because to me it sounds like either your clutch assembly is partially toasted, or you have a bad reverse gear.

Next time you are at your motor with it NOT running and the kill switch in the KILL position, put it in reverse and try and turn the prop by hand.

There should be a little play - you should be able to get it to move either direction about an inch or so, but then it should lock up solid, whether trying to force it either clockwise or counter-clockwise.

Don't "super reef" on it, but see it you can get it to rotate in one direction or the other - if you can there is a problem somewhere in the gear case..."
 
I need to convert to a tiller

I need to convert to a tiller handle for shift and throttle on 9.9 1989 mercury also how do i activate the elec starter after installing tiller . I have a 8 pin plug what wires to activate starter also the kill switch.
 
"hi graham,

i have managed

"hi graham,

i have managed to get down to my boat today and i carried out the test on the engine you suggested, my findings are below:

in reverse gear: i could move the prop freely in both directions!
in forward gear: i could move the prop freely clockwise, but it locked up when i tried to turn it anti-clockwise!

i know you have mention the gear case, where is this? and how do i access it?

kind regards

richard"
 
"It sounds like your reverse g

"It sounds like your reverse gear or half of your clutch is toast.

So at this point you have a couple options.

First - do nothing and live without reverse gear.

Second - get yourself a Seloc's manual (35 bucks) and take a good read of the proceedure for tearing down and repairing the lower unit (the gears are all in that case behind the propeller).

If after reading you figure you can tackle it yourself -

A reverse gear could run you about 150 bucks, a clutch is about 125. Plus, if you crack her open you will need to "reseal" it - so that's about 50 bucks for a seal kit.

Of course, it could simply be a 50 cent clutch spring causing your problem, but you can't tell until the lower unit is disassembled (which means a reseal at the very least).

Third - take it to a shop and have them 1) tell you it will cost too much to repair and fortunately they have a brand new 4 stroke in the showroom that you can get a deal on or 2) charge you more than the cost of a new lower unit from Merc (currently about 1600 bucks) to repair what is wrong.

Fourth - keep an eye on Ebay (or the like) for a used lower unit...."
 
"Re: option #2 - depending on

"Re: option #2 - depending on your lower unit model, it's possible that you also might need to purchase (about $70) or construct yourself a special-purpose tool to remove the bearing carrier (the part through which the prop shaft runs).

A shop manual is a great investment even if you decide not to tackle this particular project."
 
Back
Top