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  Topic Review (Newest First)
10-08-2010 10:52 AM
deniseO30 Welcome to the forums Hypex! You sort of replied to an older thread. If you starte a new thread; "Idle speed" you may get more replies.
10-08-2010 06:02 AM
hypex I had some trouble with cut out when return line didn't have loop to base of fuel tank.
What is recommended idle speed on a 722d? How best to set? (I'm a new owner just getting it going on the hard)
10-20-2009 05:40 PM
Waltthesalt Unlike gas engines diesels don't like being run at low load. You want to be about 85-90% otherwise you'll get carbon build-up. It's aggrevated by running the engine at low power then shutting it down without getting it fully loaded and the cylinders up to temperature. Check with Beta.
10-14-2009 07:05 PM
Northeaster I removed the (likely original) aluminum fuel tank in my 30 year old boat, as I figured it should be checked / cleaned. Lucky I did. it had pits on the bottom, where it sat on a wood frame. I was able to dig small holes in the tank with a screwdriver. It had been leaking somewhat, as the wood smelled heavily of diesel.

I replaced the tank with the new 19 gallon moeller poly fuel tank (around $150), and it came complete with the sending unit. I think it is a no brainer to replace the old tank, if you can get at it. Even removing the engine is not a big job. Just label all wires, and don't adjust your engine mounts, so the alignment will still be good.

I now have very little worry about clogged filters, and even water (my racor never has any in it) for a few years, as the tank is so much cleaner than an old one. Don't get me wrong, I still change filters, etc, but thye will be much less fouled than if I had a bunch of crud in the old tank, getting stirred up with every big wave you hit.
While i had the engine / tank out, I took the opportunity to clean / sand and paint the engine compartment, and the engine itself. It is so much better to have it redone. Can see leaks easily, and keep everything clean.
10-11-2009 08:02 AM
toastchee thanks maybe we are running it too high.
10-10-2009 10:19 PM
mitiempo Most marine diesels max at about 3000 rpm. Based on Beta's specs for the BD722, max rpm is 3600 rpm. Was this under load or in neutral? A diesel should not be run at high rpm unless under load. When running your best rpm is probably between 2500 and 2800 rpm. You also probably won't gain more speed past this - just dig a bigger hole in the water and burn more fuel. Reserve max rpm for short runs when you really need it.
I'm not sure about the glow plugs as I've never had a diesel with them.
If you smell a lot of diesel combined with the advice to remove 30 year old steel tank I suggest you have that work done asap. Unless you have spilled diesel fuel while changing filters or bleeding lines there should be no diesel smell. A diesel is a closed system with injectors and the only openings the engine has to the atmosphere should be the tank vent and the exhaust. As I write this I am sitting at the salon table within 6 feet of a Yanmar that has no smell whatsoever.
If you're not sure about the operation of your diesel get a good book like Calder's book (shown below). It might be a good idea to pay a good mechanic to spend an hour going through your engine and systems on the boat to learn how to operate them properly.
10-10-2009 08:26 PM
Originally Posted by jrd22 View Post
Why in the world would you run it for 20 minutes at 3500 rpm? Isn't that maximum rpm for the engine? Usually the CCW direction on the key is for the glow plugs, is it spring loaded in that position?

I'll dblchk my numbers but it definitely isn't at the top of her range...
10-10-2009 08:14 PM
jrd22 Why in the world would you run it for 20 minutes at 3500 rpm? Isn't that maximum rpm for the engine? Usually the CCW direction on the key is for the glow plugs, is it spring loaded in that position?
10-10-2009 06:13 PM
timebandit Sounds like a vent problem to me.
10-10-2009 05:47 PM
r.furborough What you have is a Beta Marine BD722 (Now Beta 20) based upon a Kubota D722 20 Beta Marine US Ltd. Distributors for Kubota based marine diesel engines and generators for sailboats, yachts and trawler boats.

Speak to Stan at Beta Marine US regarding your issues - (252) 249-2473
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