Diesel engine help - Page 2 - SailNet Community
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post #11 of 16 Old 03-30-2007
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turn over by hand, my thoughts

Hello,

I would put a large socket and breaker bar on the crank bolt and try to turn the engine over by hand. This will let you know if the engine is seized or not, water logged or not, etc.

If that works OK I would make sure there is fuel, oil, and coolant. Then I would connect a fresh battery and try to start it.

If it starts and runs, I would turn it off after a few minutes. THEN I would change fluids, filters, impellers, belts, etc.

If it doesn't start I wouldn't spend another penny until I knew why. No point in spending good money if the engine is shot.

If you start off by changing things, and it doesn't run, you have no way of knowing if you did something wrong, or if there is something wrong with the engine.

Case in point. My new to me boat came with an engine that ran great - when I could get it started. Since I knew the engine ran, my diagnosis was much easier. In my case the glow plugs were not getting power because of a bad connection. When I cleaned the contacts the engine became much easier to start.

Then I changed the fuel filters. And the engine would not start. It was because I bled the primary filter and secondary filter, but not the injectors. Since the engine ran before I touched the fuel filters, it had to be something I did.

If I just started changing things, trying to get the engine started would have been much more difficult.

Good luck,
Barry

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

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post #12 of 16 Old 04-01-2007
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Quote:
Originally Posted by btrayfors
Patrick,

Take your last penny to the bookstore and buy Nigel Calder's Marine Diesel Engines.

Bill
Even if I already have his "Electrical and Mechanical" manual, which includes a fair amount on marine diesel maintenance and troubleshooting?
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post #13 of 16 Old 04-01-2007
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Quote:
Originally Posted by eherlihy
I would reccomend the following in sequence:
  1. Remove the injectors - while they are out, you may want to have them serviced by a pro, or not...
  2. Crank it over (to see what comes out of the fuel tube, and the cylinder head )
  3. Change the oils (Engine & Tranny)
  4. Clean the fuel tanks (hopefully you can)
  5. Replace the air & Fuel Filters and clean the water strainer
  6. Replace the belts (note that I would NOT change the impeller, but I'd definately have a spare available)
  7. Reinstall injectors
  8. Bleed the fuel lines
  9. Fire it up
  10. Check the water flow from the exhaust
  11. enjoy

Remember - Free advice is worth every cent
Ed
How tricky is it to remove injectors? Do you need a special tool for that? FWIW, the diesel in my boat is a Univeral 5416, made in 1981.

Would it be wise to routinely remove the injectors and squirt WD40 or fogging oil into the cylinders for winter layup?
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post #14 of 16 Old 04-01-2007
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Quote:
Originally Posted by patrickbwells
the engine has not been started in about a year. It is a pretty new Isuzu Marine Diesel with very little rust or corrosion. What should I do to the engine before I start it?
A year is nothing for a diesel to sit especially if it is fairly new.

1. check all fluids.

make sure clean and up to level, No debris/water in fuel filter Etc.

2. Build up oil pressure before starting.

You can do that by cranking engine watching o/p gauge with either cable kill engaged or by pulling the wire from the solenoid on the injector pump.

3. Try starting...

After checking fuel filter for crap more than likely there is air in the system and you will need to bleed the air out by loosening (do not remove line from injector) the injector line on the injector if you have more than four cylinders crack two lines loose. Don't get discouraged if it takes a bit to bleed the air out it's not uncommon, although on a newer engine shouldn't be a problem.
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post #15 of 16 Old 04-01-2007
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Quote:
Originally Posted by wumhenry
How tricky is it to remove injectors? Do you need a special tool for that? FWIW, the diesel in my boat is a Univeral 5416, made in 1981.

Would it be wise to routinely remove the injectors and squirt WD40 or fogging oil into the cylinders for winter layup?
Here's a link for the owners manual it will tell you what tools you need.
just hover over link right click "save link as"


http://www.aloha34.com/information/u...omicowners.pdf
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post #16 of 16 Old 04-01-2007
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Quote:
Originally Posted by CarelessNavigator
Here's a link for the owners manual it will tell you what tools you need.
just hover over link right click "save link as"


http://www.aloha34.com/information/u...omicowners.pdf
Thanks, Careless. Wow, it says you need a wrench with a 27 mm socket!
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