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| 5 HP -4 Stroke Nissan THERMOSTATE a... |
| Author |
Message |
    
Chuck Rothert
Member
Username: lucky_bum
Post Number: 8
Registered: 10-2007
| | Posted on Monday, November 19, 2007 - 08:50 am: | 
|
I wish I would'a payed more attention to the water stream that exits on the starboard aft of the engine.
Just replaced the fresh water impeller and I'm running the motor on a stand with the lower unit sunk in the big heavy duty Rubbermaid "ROUGHNECK garbage container. Here is the scenario,,,
a. At start up Engine runs and pumps a good stream (water is cold).
b. Takes quite awhile to warm (8-10 min.)
c. When warm, the stream tends to slow and water changes from warm to almost to hot to touch. Them the flow increases and water gets cold quickly.
I think it is normal scenario of a working thermostats. Any thoughts?
Another thing the Tohatsu shop manual talks about how to test the thermostat in a pan of boiling water---etc. But does not show where it is on the motor. Any one know where they are located? |
Graham Lamb
Senior Member
Username: galamb
Post Number: 2240
Registered: 05-2007
| | Posted on Monday, November 19, 2007 - 12:23 pm: |
|
Chuck, it sounds like your thermostat is toast - opening too late - belive your model will have a thermo set for about 125-130 degrees - sounds like it is opening late.
Anyhow, I don't have a Nissan manual, however, the 5 horse Nissan is built by Tohatsu. They also build the Merc 5 horse. So here's a diagram from the Merc service manual (the motors are identical except for a couple minor items and the colours/decals.
#19 in the pic is the thermostat...
 |
Chuck Rothert
Member
Username: lucky_bum
Post Number: 9
Registered: 10-2007
| | Posted on Monday, November 19, 2007 - 01:51 pm: |
|
Graham,
Here is the page in my Tohatsu shop manual.. Strange that it does not show a thermostat where your Mercury manual does. It is the same drawing but labels are different.
I can't see the thermostat offered here on this forum however I do see it at the Mastertech forum parts department. Would like to buy here, especially because I get such good replys here. I'll try to post my pix. No sucess Need to reduce to less size megabytes. Anyway your pix show me where to look and I thank you. Send me an e-mail at crothert@gmail.com and I'll send you directly. |
Chuck Rothert
Member
Username: lucky_bum
Post Number: 11
Registered: 10-2007
| | Posted on Monday, November 19, 2007 - 08:17 pm: |
|
See if this
works.
From the Tohatsu
manual |
Andrew Menkart
Moderator
Username: andrew
Post Number: 1439
Registered: 03-2001
| | Posted on Monday, November 19, 2007 - 08:27 pm: |
|
What is the part number of the thermostat? |
Tohatsu Guru
Member
Username: tohatsu_guru
Post Number: 40
Registered: 06-2007
| | Posted on Monday, November 19, 2007 - 10:12 pm: |
|
The part numbers are at the address below:
www.internetoutboards.com/partdetail.asp?id=718
The difference in the manuals is due to one being a parts manual and the other being a service manual. |
Chuck Rothert
Member
Username: lucky_bum
Post Number: 13
Registered: 10-2007
| | Posted on Tuesday, March 18, 2008 - 08:59 am: |
|
Follow up,
Thanks to Tohatsu Guru, The thermostat kit works just fine. I installed in my 5 HP Nissan 4-stroke and ran for over an hour at a steady low idle and water temp is now constant at a warm temp not hot as it were.
Back in the 70's I had built a Heath Kit Engine Analizer with all the toys.. Unfortunatly it does not have a provision to check RPM's for a one cylinder engine.It reads for 3-4-6-&-8 cylinder engines |
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