The tachometer in my Beneteau370 (Volvo Penta 2001) only works intermittently, and now I think it quit altogether. What's wrong, and can it be fixed?
tachometer
- Thread starter dkanel
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Exactly what doesn't work? The rpm indication or the hour meter or both. I have had two V-P tachs fail with intermittent hour meter readings but never the rpm indication.
My fix has been to replace the entire tach with one that I bought on eBay. I think you will find that V-P prices are totally nuts.
My fix has been to replace the entire tach with one that I bought on eBay. I think you will find that V-P prices are totally nuts.
Intermittent (works fine some of the time) faults are a sign of a loose/rusty connection or a bad wire shorting to ground. Does the volvo have a tach sensor on the engine or does it use the alternator stator winding as a source?
Thank you for he reply. It is the rpm needle. It does not have an hour meter. I have a separate meter for engine hours.
After yo check for bad connections and are certain that it really is the tach itself, I would replace. Check eBay for a size you need.
I dont think you have a Volvo 2001 on a 30+ feet boat. Volvo 2001 means 1 cylinder.
Almost all diesel tech uses the AC from the alternator to provide input to the R.P.M
You might have bad connection.
Almost all diesel tech uses the AC from the alternator to provide input to the R.P.M
You might have bad connection.
Just did it
I just replaced my tack on my yanmar,check wires going to tack red hot black ground orange should be the wire from tack and check engine not running and than running,or turn key on and see what wires are doing what when key on and off and than check wires with engine on and off.
Got my tack from Defender.
Nick
I just replaced my tack on my yanmar,check wires going to tack red hot black ground orange should be the wire from tack and check engine not running and than running,or turn key on and see what wires are doing what when key on and off and than check wires with engine on and off.
Got my tack from Defender.
Nick
While I was working as a boat tech 2 years ago, I was asked to replace a Volvo-Penta tach with the factory part. Yeah... $$$. In this case the tach had water damage, so it hadda be changed. But still...
To the OP - if your tach isn't physically damaged and water hasn't entered it, it would be worth the half-hour to hour it would take to check the tach wiring - from the back of the tach through the remote panel, the remote panel's connector, through to the engine harness and the harness connector. The goal is to find and tighten any loose connection.
If I recall correctly, the multi-pin connectors in the engine-panel harness can sometimes have a contact problem. DO not disconnect anything while the engine is running unless you know exactly what you're doing. The multi-pin harness connectors can be opened and inspected if the engine is stopped, and preferably, the engine's 12v breaker is off.
Obviously you do any of this at your own risk. If you aren't comfortable with electricity and electronics, and you don't have a friend with real electrical experience who could help, then you're best off calling a pro.
I've found good working tachs at boat flea markets for as low as $10, but they're not always a good match for a specific requirement.
To the OP - if your tach isn't physically damaged and water hasn't entered it, it would be worth the half-hour to hour it would take to check the tach wiring - from the back of the tach through the remote panel, the remote panel's connector, through to the engine harness and the harness connector. The goal is to find and tighten any loose connection.
If I recall correctly, the multi-pin connectors in the engine-panel harness can sometimes have a contact problem. DO not disconnect anything while the engine is running unless you know exactly what you're doing. The multi-pin harness connectors can be opened and inspected if the engine is stopped, and preferably, the engine's 12v breaker is off.
Obviously you do any of this at your own risk. If you aren't comfortable with electricity and electronics, and you don't have a friend with real electrical experience who could help, then you're best off calling a pro.
I've found good working tachs at boat flea markets for as low as $10, but they're not always a good match for a specific requirement.
Volt meter
Disconnect the wires off the back of tack and see what you get key off and on and hot and ground and one wire will do nothing when engine off and than start engine and that wire for volts.
If power to all wires on back of tach than tach bad and need to replace.
Nick
Disconnect the wires off the back of tack and see what you get key off and on and hot and ground and one wire will do nothing when engine off and than start engine and that wire for volts.
If power to all wires on back of tach than tach bad and need to replace.
Nick
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