Re: [OMC-Boats] OMC-Boats Digest, Vol 68, Issue 1

Re: Bogging own after 45 min.
I had the same problem with my 1965 Deluxe 155 V6. I thought it was the
coil overheating as well, BUT found out after a few outings that
unfortunately the oil had leaked out of the upper gear case and it was
seizing-up when it got hot. Then after it cooled a little, it would go
again for awhile. I used it a few times like this thinking it was the coil
until it seized solid. That's why it it won't go any faster the more gas
you give it- it's seizing!
Once I changed the upper gear case it ran perfect.
Check the oil level in the upper and lower gear cases.
Good Luck

On Mon, Jul 8, 2013 at 12:00 PM, <omc-boats-request@...>wrote:

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> 1. Bogging down after 45 mins of running - any ideas? (Micah Donahue)
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> Message: 1
> Date: Mon, 8 Jul 2013 02:47:41 +0000
> From: Micah Donahue <mdonahue@...>
> To: "omc-boats@..." <omc-boats@...>
> Subject: [OMC-Boats] Bogging down after 45 mins of running - any
> ideas?
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> 44f4dae973ac402bafdd8ce9a0a35ab9@...>
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>
> Howdy --
> I own a '68 Sportsman 120 w/ a '69 155 engine kept in Southwest Harbor,
> Maine. It's fairly original, meaning points, OEM coil, rebuilt carb from
> Flying Fish if I remember correctly, etc. The major mods at this point are
> only a new outboard engine style fuel tank (old one rusted out), oil
> filter-style fuel filter, separate blower/bilge pump and such small stuff.
>
> So, I had the old girl out this Fri for a few hours -- 1 of the typically
> half dozen days a season I get to use it. The rest of the time it's stored
> inside. It's always fogged and gas drained in the fall. On Fri, after
> charging battery and checking all the typical issues (tilt motor, shifting,
> bilge pump) I filled the tank, dunked it in the lake and it fired right up.
> Idled low and quiet, pumping water just like it's supposed to. I breathed a
> sigh of relief and cast off.
>
> I then proceeded to run at 3/4 throttle or so for about 45 mins. At that
> point, I noticed I could give it more gas but it wouldn't go any faster. It
> then started to bog down more, and eventually the motor died completely, as
> if you shut off the key. All this time there were no "hot" or "oil" lights
> on, both manifolds were warm but not burning, and it didn't smell hot.
> Wondering what was up and if I'd be paddling to shore, I opened the gas
> tank cover, topped off the tank from a jerry can, and let it rest for maybe
> 15 mins. At that point, it started right up and ran well for another 45
> mins or so, until same issue. After lunch, I found I could run for at least
> 2 hours at say 1/4 throttle. So it seems related to higher revs/load.
>
> Any ideas, ladies and gentlemen? I did not change the screw-on fuel filter
> or sparkplugs this year, although I did both last year. The filter would
> have been cleared of any old gas by the time I had a problem anyway. It
> didn't look like the plastic gas tank was sucking in and there was no
> whoosh when I opened it, so I don't think I have an inop tank vent. Also,
> my gas line to the outboard style tank has a squeeze bulb inline and that
> seemed to always be full. Could I be overheating the coil?* I noticed that
> was very hot to the touch. Dying fuel pump? That's pretty cheap and easy to
> replace.
>
> Help...my eternal gratitude to any and all replies/ideas!
>
> *Related, I'm considering upgrading to CRT performance's HEI ignition and
> coil anyway, which would eliminate the spark related causes. I'll be
> driving by their shop this week, in fact. Please let me know if anyone
> believes that $250 wouldn't be $ well spent.
>
> Thanks much,
>
> -Micah Donahue
>
> Newburyport, MA
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> End of OMC-Boats Digest, Vol 68, Issue 1
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Received on Monday, 8 July 2013