tach question
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=31132
Printed Date: November-18-2024 at 2:47am
Topic: tach question
Posted By: 75 Tique
Subject: tach question
Date Posted: August-08-2013 at 2:03pm
My tach shows roughly 500 to 700 RPM high, I would guess (based on rule of thumb that 1:1 trans and 13 inch prop, then MPH ~ RPM.)(note speeds are GPS speeds, so I am confident in those)
I will also point out that at top-ish end, it always seems off. At lower end (like idling) sometimes it seems right (600-700)and other times it seems to read high (1100, when I know its making 600-700 sound)
Before I drop the dough on a new tach, are there other possible causes of this symptom? (wiring, ground.....?) or do those symptoms suggest the unit is the culprit?
Thoughts? Thanks.
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Replies:
Posted By: Air206
Date Posted: August-08-2013 at 6:09pm
Larry - Let's turn this into a generic troubleshooting the tach thread since my tach is reading in error as well.
I assume we should start at the engine and work to the dash. My old tach has cylinder settings and a trim pot on the back to fine tune the rpm. So, I figure we need to go to the source and cut out the wiring harness to begin with. How do we do that?
I have this crazy laser rpm gauge for lathes... would sighting that at the crankshaft pulley give me engine RPM as shown on the tach? Can I try to trim the tach to those points at varying RPM? Should I pull the tach out of the dash and go straight to the engine with it?
What's the best way to zero in a tach?
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78 SkiTiq
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