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Old 01-16-2019, 11:18 AM   #21
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Originally Posted by tadhana View Post
The heat exchanger probably has a rubber gasket seal. Use a little silicone grease (most any grease but not Vaseline..It contains hydrocarbons. Hydrocarbons can soften some rubbers. Silicone grease will not). I've been using silicone grease on my engine and gen set for 10 years, The gaskets are still fine. A small dab of silicone grease on the threads of your deck (fuel) fills and on the threads of your sea strainer caps will also help them seal and reduce the chance that they will get stuck!
Ok thanks. Was thinking gasket maker but sounds like that is overkill.
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Old 01-16-2019, 01:05 PM   #22
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If coolant is still clear as most are, just a drain and flush and refill is all that is needed. No need to chemically clean the coolant side as it is hard to get all the chemical out.

Why replace the thermostat? I have found Kubota tstats to be very reliable.

Heat exchanger should be chemically cleaned on the sea water side say every five or so years. Remove it to clean. If it has the central bolt end caps, it is probably a SenDure unit and the cap gaskets are generic. Replace them and end caps, available almost any marine supply house. Not sure about putting silicone grease on them as that may become a persistent lubricant and allow the gasket to extrude. Clean and dry is fine. And end of HX must be clean clean clean.

Belt tension, just put it "snug". Hard to describe, but it does not have much load on it driving alt and circ pump, so just snug it down so it does not flop around when running.
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Old 01-16-2019, 02:38 PM   #23
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Originally Posted by Ski in NC View Post

Why replace the thermostat? I have found Kubota tstats to be very reliable.

True, It is always best practice to check the thermostat as they get rust on them that affects their operation. Cheap insurance.
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Old 01-28-2019, 07:15 AM   #24
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Out of curiosity, does anyone know if the ODKBM has an alternator? I.e. will it charge the genset starting battery while running or do I need to use a battery charger?
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Old 01-28-2019, 11:11 AM   #25
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Look at what the belt drives. Bottom pulley is crank. Up top is circ water pump and off to one side is alternator, of some sort. I think your unit has a std car alternator. Some have permanent magnet alternator and a motorcycle type regulator (shunt type). PM types look like a bell, car alt types you can see the windings through air vents in the case.
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Old 06-08-2019, 10:37 AM   #26
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Quick question

Volvo filter # 3581078 comes with three large gaskets (I think two same size, one larger) and two small

Two small I have figured out

One larger goes on bottom of fuel filter between the bowl and filter as indicated by red arrow

Other larger goes up in lip of metal assembly as shown by a red arrow

But where does the third larger one go? In the lip of the fuel filter as shown by the yellow arrow??? If so, aren't there essentially two gaskets there then? (one in the metal lip and one at the top of the fuel filter)

Thanks
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Old 04-27-2020, 02:14 PM   #27
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All

I know I raised this a year ago but I am thinking about Barnacle Buster flush on the raw water side of the Onan MDKBM

Curious if the genset can be flooded by forcing water through the raw water side? I have heard many flood their gensets and destroy them. I think it was in relation to a high speed water pickup or something letting water in when the generator was not running. Just want to make sure if I attempt this I am not going to break anything...

Thanks!
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Old 04-27-2020, 02:44 PM   #28
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Does the smaller (water) hose come easily off the exhaust mixer? If so you can use that as one of the recycle points. With that off the mixer, no was to get the fluid to back up into engine. Just don't start it with it off.

Also when done and all back together, run it for many hours to get as much of that solution flushed out.
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Old 05-03-2020, 07:02 PM   #29
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Mystery -
What makes you think you need a BB treatment?
I freshwater flush about 1 x per month and add salt away.
So far no issues (5 years old)
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Old 05-23-2020, 04:35 PM   #30
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hi does anyone know if the MDKBM is considered fresh water cooled? can water get into the generator and cause damage if i leave the seacock valve open when underway but not running the generator?
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Old 06-15-2020, 09:32 PM   #31
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Has anyone done this service or had it done?

"Change Generator Bearing(s) & Drive Belt" the maintenance schedule says due at "5 years/2,000 hours"

Which belt is it talking about? Is the v-belt the same as the drive belt?

It says "Must be performed by a trained and experienced mechanic (Cummins Onan Distributor or Dealer) in accordance with the engine and generator service manuals"

Problem is the Cummins Onan dealer had no clue what it was when I asked. Said it meant the water pump LOL
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