Author Topic: Tohatsu outboard  (Read 365 times)

Offline Adagio19

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Tohatsu outboard
« on: December 12, 2017, 11:41:28 AM »
We are the new owners of an old Tohatsu 5hp 2 cycle outboard probably from the 80's . Should there be water coming out of the tell tale tube when the motor is first started or does a thermostat stop the flow until the motor is hot? About how long should we wait for the water to come out of the tell tale before we panic?     Thanks  Doug  Com-pac19 Lake Guntersville, Alabama

Offline bruce

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Re: Tohatsu outboard
« Reply #1 on: December 12, 2017, 12:14:35 PM »
Doesn't sound right to me, but I don't know the specific OB.

Here's a pdf from Tohatsu for 5 HP carbureted 2-strokes, with and without the internal tank. Doesn't give a model year. Page 8 says check for flow after starting. No mention of waiting until it warms up. It doesn't have a parts diagram, but you could look for that if you wanted to verify for sure that there is or isn't a thermostat.
http://www.tohatsu.com/tech_info/own_man_pdfs/Toh5B_5BS.pdf

Most blockages for me have been corrosion right at the discharge hole, and easily cleared. Good luck!
Bruce
Aroo, PC 308
Narragansett Bay, RI

Offline slode

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Re: Tohatsu outboard
« Reply #2 on: December 12, 2017, 12:38:39 PM »
It can take a few seconds for water to pump through the system but you should see something regardless of engine temp within 20 seconds.  If you don't you need to check the impeller, because even if it's a blockage the impeller is likely shot from overheating.  I'd get the whole kit with gaskets and housing.  And with it apart check all the passages both inlet to pump and through to outlet.  It's common for sand and such to clog things up.  And if you find any chunks or vanes missing from the impeller those can get stuck inside too.

Offline brackish

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Re: Tohatsu outboard
« Reply #3 on: December 12, 2017, 09:20:18 PM »
The tell tale stream is separate from the actual cooling circuit.  It is just there to tell you that you have circulation.  If you have a thermostat it will not stop the tell tale stream, it should come on immediately.  You could have a problem with your impeller or more often you could have a spider web or dirt dauber plug in the tell tale pipe.  Poke something up there and if that is not successful then tear it down and check the water pump.  Not a big or complicated job.

Offline Adagio19

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Re: Tohatsu outboard
« Reply #4 on: December 13, 2017, 07:52:53 AM »
Thanks for the advice.  A  local repair shop suggested I run the motor for 5 or 10 minutes to see if the thermostat would open.
                                                                                                     Doug  Guntersville,AL

Offline Gerry

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Re: Tohatsu outboard
« Reply #5 on: December 13, 2017, 09:43:51 AM »
Everyone else is correct.  Water should come out of the telltale right away.  In a motor that old you should change the impellor anyway.  Spark plug, lower unit lube, impellor, etc. is regular maintenance.  There are lots of UTube videos showing how a do-it-yourselfer can complete all of these jobs.  Never trust the person before you in ownership.  AND don't forget to use ethanol free, high octane gas in every small engine.
WYATTC: CP-16; 1981

Offline Adagio19

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Re: Tohatsu outboard
« Reply #6 on: December 15, 2017, 06:39:44 AM »
Thanks again for the feedback. The problem has been perhaps temporarily fixed  by a local shop who used air pressure to back flush the tell tale. The previous owner had used the motor in salt water and maybe not flushed it. As noted by you folks the water appears from the Tell tale very quickly with a good flow.     Doug com-pac19 "Adagio" Guntersville AL                                                                           

Offline Yamaha33410

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Re: Tohatsu outboard
« Reply #7 on: December 15, 2017, 08:20:47 AM »
water should come out instantly on most engines, if not all(well everyone I've ever seen)

My smaller outboards, Tohatsu 6hp 4 stroke and Yamaha 4 hp 4 stroke, will push water out just by turning the engine over with the pull chord....

1981 Compac 16

1979 Compac 23

-West Palm Beach, FL