Tartan 27' owner
Join Date: Jan 2008
Thanked 107 Times in 99 Posts
Rep Power: 8
Loss of Tach.
On a friends boat we had to have the alternator rebuilt after we fried the diodes by setting up the batteries incorrectly. I re-installed the alt. which has a wire running to the tach. That wire connection was done in a shoddy way by me and disconnected rendering the tach. useless. I had to make a proper connection and the tach. worked fine.
Squeal from engine.
Find out where the squeal is coming from. It is probably one of the water pumps, the alt. or the alternator. They all have bearings around shafts that spin that eventually fail and will create a nasty sound and need to be replaced.
Idling your diesel.
I'm not an expert by any means but I have read a great book by Nigel Caulder ('Boatowners Electrical & Mechanical Manual'). Everything I have read indicates that diesels like to be run at WOT (wide open throttle) or close, while under load so they get up to operating temperature rather then idling them where they do not get as hot. A hot diesel is a clean burning diesel whereas a cool idling diesel is likely to have incomplete combustion in the cylinders. You don't have to run the engine at WOT to get the temp up but you are supposed to have it under load, ie., either in forward or reverse, not in neutral.
Dripless or traditional require water in the shaft log for lubrication. This could also be the source of your squealing sound. Make sure your neutral gear is fully engaged and the shaft is not spinning if running 'on the hard'/drydock.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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