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Tach Problem??/Low Idle

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Ten42 View Drop Down
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    Posted: 05/24/2012 at 10:03pm
Hello,
 
I finally finished up getting everything ready to go for the year...So I thought. I fired the motor up and it idled right away...It sounded right where it needed to be. So I got to looking at the Tach and it was idling at 1500 according to the gauge. That seemed awfully high to me so I adjusted the idle screw and was able to get it down to 1300 but I wouldn't want to take it any lower. I've double checked and on the back of the tach I have it on "3" as my motor is a 3 cylinder. Does anyone have any suggestions? I'm starting to see why the boat didn't have any gauges installed from the factory now. I don't think any of mine are accurate. I've adjusted the trim gauge as far as it will go and still can't get it to read a true up and down setting, and my voltmeter seems to be low as well. It likes to stay at around 12 even when the boat is running or even when the battery is hooked up to the charger. But my main concern is getting the tach issue resolved. I'd like to make sure the prop I'm running is going to give me the correct RPM at WOT. It's pretty much the whole reason I bought the PS Gauge Panel to begin with. Thanks for the help!
1992 Godfrey Sweetwater 24'
2004 Mercury 90 2-Stroke
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:18pm
Set the switch on the back of the tach to the "6" setting. The switch setting is for the numbers of "Pulses" your engines alternator puts out, not the number of cylinders for your engine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ten42 Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:28pm
OK, I'll try that. In the instructions PS provides it states to set the switch to the # of Cylinders your motor has. This is what it says:

Rotate adjustment screw on back of tachometer to match number of cylinders on your

outboard engine.

Is something not right with their instructions or I wonder if they have tried making it easier to install but messed something up? I sure hope this works. And I'm probably going to have to mess with it in the morning to see. Thanks for the advice!!
1992 Godfrey Sweetwater 24'
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:36pm
That would apply if your engine was an Inboard or an Inboard/Outboard automotive type engine. But outboards go by the number of alternator poles. Which Tachometer do you have? It must be for an outboard motor..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ten42 Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:39pm
It is the one included in the Pontoon Stuff Gauge Panel. It's a Faria Tach.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:47pm
Always, ALWAYS verify. I will contact PontoonStuff to get them to correct that. Here's the correct installation settings http://faria-instruments.com/site_manuals/IS0086p.pdf. Their instructions are incorrect as 7000 rpm tachs are for outboards and they use pulses.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ten42 Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:50pm
I had already read through those instructions as I was doing my research but I just kind of thought PS had done something to make it an easier install or something. I try to follow directions whenever available!! No harm, no foul though. In the morning I will change the settings on the tach and then readjust my idle. Hopefully I can get it back to where it was anyhow!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:54pm
I see that the Faria site recommends the "5" pulse setting. That is in conflict with the settings I have always used with a 12 pole alternator, which is the 6 setting. On that same page, it even says that "Electrical pulses per revolution are equal to 1/2 the number of alternator poles". That would be 6...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:55pm
Email sent to retail bosses to fix the installation instructions
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ten42 Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 10:56pm
Well now I'm startin to get a little confused as well!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:00pm
The correct setting for a 7000 RPM outboard tach with an outboard that has a 12 Pole alternator is "6". That is what you have..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:01pm
Must be talking about this piece you see (which appears incorrect)
(lower right) 

OB ALT SWITCH SETTING

1 - 4 POLE

2 - 6 POLE

3 - 8 POLE

4 - 10 POLE

5 - 12 POLE

SLIGHTLY DEPRESS WHILE TURNING

7000

Instead of this on the left side
 

50 HP & above, ** 75, 90,115 HP (4 stroke EFI) 12 pole setting (6)



Edited by Wildcat Dude - 05/24/2012 at 11:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:04pm
Yep..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ten42 Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:06pm
So that is the same diagram that is on the back of the tach as well. So even though it appears that the diagram is showing to use setting 5, its a misunderstanding and I should just use setting 6? I found it odd that the diagram didn't say anything about setting 6.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:06pm
 Should be:

OB ALT SWITCH SETTING

2 - 4 POLE

4 - 6 POLE

4 - 8 POLE

5 - 10 POLE

6 - 12 POLE

Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:08pm
I do remember getting a tach years ago, that they had 0 through something and then 20 (force) and 5 did indicate 6 pulses on that particular tach, but again, that was years ago and I don't remember who made that tach (talking early to mid 80's)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:09pm
You can set it on 6 and see what happens. If it's way off, then try the 5 setting. All I can say is I've never set a Tach on the 5 setting when using a motor that had a 12 pole alternator. Maybe Faria has changed their gauges..Confused Might be worth a call to Faria to see what they say..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ten42 Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:11pm
Well the back of this one is numbered 1-6. I went out and crawled under the cover just to make sure my mind wasn't playing tricks on me!! I'm going to try setting 6 tomorrow and I'm sure that will solve my problem!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CajunDiver Quote  Post ReplyReply Direct Link To This Post Posted: 05/24/2012 at 11:56pm
I don't know much about tach settings, etc but I wouldn't adjust my engine RPM's based on the tach at the gauge panel. I would use a tachometer made to attach to check RPM's at the motor and set that way. I have seen tachs, in fact Fariah tachs, that would change readings just by tapping on the glass. Adjust the motor to the proper idle RPM using a tachometer then work the gauges to agree.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 12:49pm
Got an email, they will make changes to the web site to reflect the correction soon.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 5:55pm
Website instructions have been updated now
 
 


Edited by rickdb1 - 05/25/2012 at 6:22pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote p3cflyr Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 6:05pm
Tried those links and get a 404 error.  Also went on PS and found the inst to still read 4 for 10 pole and 5 for a 12 pole.  May not be ready just yet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 6:16pm
Maybe Faria has a different kinda tach that uses those setting. But it would be different from every other brand. I think I may have kept my original Faria Tach that came with my toon when new. I'll have to look and see what it was set on. I was hoping thisdj1 would let us know what worked for him..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 6:23pm
Originally posted by adakops adakops wrote:

Tried those links and get a 404 error.  Also went on PS and found the inst to still read 4 for 10 pole and 5 for a 12 pole.  May not be ready just yet.
 
Links fixed..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 6:41pm
Well.........I went out and looked at my original Faria Tach and low and behold, it is set on "5". It read the RPM's correctly when it was installed on my toon that has a 12 pole alternator, so "5" is the correct setting. I stand corrected. Smile But only for Faria Tachs, cause I know for sure others (Teleflex, Etc) use the "6" pulse setting.Wink
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 7:02pm
Haa, well I be whipped. thanks for the pics Rick as that certainly cleared that up. So Faria just had to be different LOL, wonder if we can get thisdj1 to take a pic of the back of his, but I'll bet its the same as yours Rick, thus explaining the settings.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/25/2012 at 7:25pm
Most outboard Tachs don't have the "1" setting. Usually 2-3-4-5-6. So I guess they had to be different.LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lampe208 Quote  Post ReplyReply Direct Link To This Post Posted: 05/26/2012 at 3:17pm
Setting the tach at 6 . Does this apply to a 1989 evil rude 25 up . I can't get my tach to work. It starts moving when I turn the key and moves slowly around like a second hand on a clock
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05/26/2012 at 5:03pm
See your other post..
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