Mercury 4hp four stroke first use report oil overheat. - Page 3 - SailNet Community
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post #21 of 28 Old 07-29-2014
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Re: Mercury 4hp four stroke first use report oil overheat.

I used a 10w40 semi-synthetic in my Tohatsu 3.5, because I had a bottle handy, nothing terrible happened.

You can use a cylindrical, concave, flushing attachment - aka a bucket. As long as it covers the cooling water intake, and you don't put the engine in gear, it will suffice!

I gave up on finding a flushing attachement that fits my Yamaha 8, use a bucket instead.
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post #22 of 28 Old 07-29-2014 Thread Starter
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Re: Mercury 4hp four stroke first use report oil overheat.

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Originally Posted by MarkSF View Post
I used a 10w40 semi-synthetic in my Tohatsu 3.5, because I had a bottle handy, nothing terrible happened.

You can use a cylindrical, concave, flushing attachment - aka a bucket. As long as it covers the cooling water intake, and you don't put the engine in gear, it will suffice!

I gave up on finding a flushing attachement that fits my Yamaha 8, use a bucket instead.

I did just that. Ran it til' it died using up the little bit of gas that was left in the tank. I figure that it's flushed as well as it can be...
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post #23 of 28 Old 07-29-2014
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Re: Mercury 4hp four stroke first use report oil overheat.

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I did just that. Ran it til' it died using up the little bit of gas that was left in the tank. I figure that it's flushed as well as it can be...

See page 34:

http://www.tohatsu.com/tech_info/own...03-11059-6.pdf

Parts:

Tohatsu Outboard Motors

An earlier post had a link to West Mine for the coupler

Suggest you let it warm up so the thermostat opens

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post #24 of 28 Old 07-29-2014 Thread Starter
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Re: Mercury 4hp four stroke first use report oil overheat.

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Originally Posted by dabnis View Post
See page 34:

http://www.tohatsu.com/tech_info/own...03-11059-6.pdf

Parts:

Tohatsu Outboard Motors

An earlier post had a link to West Mine for the coupler

Suggest you let it warm up so the thermostat opens

Pau T
Sometimes things get lost in translation. If I understood it properly, you remove the prop and tape over the water inlet on the bottom of the shaft? Really, who is going to do that after every use? Doesn't running it in a bucket of clean water do the exact same thing, or am I missing something?
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post #25 of 28 Old 07-29-2014
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Re: Mercury 4hp four stroke first use report oil overheat.

There are two kinds of flushing attachments. If you use the Tohatsu one, it connects to the power head, so you have to plug the normal intake. You can also get things like a pair of headphones, that cover the normal intake. Finally, the bucket uses the normal intake, so do not plug it.

Finally finally, I believe the prop removal is a safety precaution, not needed for flushing per se.

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post #26 of 28 Old 07-30-2014
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Re: Mercury 4hp four stroke first use report oil overheat.

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Originally Posted by ericb760 View Post
Sometimes things get lost in translation. If I understood it properly, you remove the prop and tape over the water inlet on the bottom of the shaft? Really, who is going to do that after every use? Doesn't running it in a bucket of clean water do the exact same thing, or am I missing something?
I missed the part about plugging up the intake, have to go back & re-read it, seems like a pain? For many years, I had a barrel, & "ears", worked fine. When changing oil, I used a large bucket on the Tohatsu, also worked fine, just let it run for a while.

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post #27 of 28 Old 07-30-2014
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Re: Mercury 4hp four stroke first use report oil overheat.

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Originally Posted by dabnis View Post
I missed the part about plugging up the intake, have to go back & re-read it, seems like a pain? For many years, I had a barrel, & "ears", worked fine. When changing oil, I used a large bucket on the Tohatsu, also worked fine, just let it run for a while.

Paul T
Well, this page has a bit of a different take on it:

Frequently Asked Question: Freshwater Flush - Nissan and Tohatsu outboards

Quote:
Flushing Plug Attachment:
The flushing plug attachment is available for all outboards ($19.99). It is a bit cumbersome to use and requires removal of a water bolt on the engine. Once the water bolt is removed, the flushing attachment can be used. After flushing, the flushing attachment is removed and the water bolt is re-installed. When using the flushing plug method, the engine should NOT be operated while flushing.
Assuming it works that way, you wouldn't have to take the motor off the mount, if you can get at the flushing bolt.

In any event, flushing can't hurt. I have had motors on our sailboat, used in salt water, and not flushed, for many years, and with one exception, had no problems.

Paul T
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post #28 of 28 Old 09-01-2014
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Re: Mercury 4hp four stroke first use report oil overheat.

The Tohatsu/Nissan/Merc/Evinrude 4/5/6 4-stk can use a flushing adapter that screws into either the leg (some models) or under the powerhead. Better to run it in a test tank (garbage can) as then the intake is definitely submerged.

If you are running with the LED on, that indicates low oil pressure. The LED will flicker as you pull, then will light at first when started/running, and should go out when run for a few seconds. It clicks in at about 4 psi.

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