Universal m-18 engine compartment smoke - SailNet Community
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post #1 of 13 Old 09-28-2019 Thread Starter
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Universal m-18 engine compartment smoke

Just took my Catalina 27 (with a universal m-18 motor in it) our for a cruise. It noticed a slight running sound when I started it up, went cruising for 20 mins and opened the engine compartment and a bunch of smoke was in there. I can’t see any belts rubbing or anything touching the engine that is melted. It smells like electrical or rubber type thing. I came back to the dock and killed the motor to have a look. Started it up again and running at full throttle tied to the dock and can smell it slightly but not as bad as before. Been running it for 20 mins now at the dock . Water pump has good flow. Any ideas ?
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post #2 of 13 Old 09-28-2019
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Re: Universal m-18 engine compartment smoke

Sealant burned off...?
Has any work been recently done?
When nose picks up elec smell, alarms in the mind set off quick

If elec and there was smoke, you should be able to find evidence

..another thought.
Double check the exhaust connections all the way

Last edited by RegisteredUser; 09-28-2019 at 05:00 PM.
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post #3 of 13 Old 09-28-2019 Thread Starter
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Can’t find any electrical that looks like it is burned. All the hoses look fine there are no leaks that I can see. I recently did an oil change but that was 20 hrs ago on the motor. What kind of sealant?

The rubbing/ scratchy sound is concerning to me but not sure what that could be
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post #4 of 13 Old 09-28-2019
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Re: Universal m-18 engine compartment smoke

The shaft isnt turning at the dock. No smoke or smell

Shaft turns when off the dock, smoke and smell....

May e something to check
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post #5 of 13 Old 09-28-2019 Thread Starter
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Shaft is turning fine when at the dock. Now I notice that when I put throttle up all the way, it will only go up to 2000 rpm. My typical cruising is 2200 rpm and if I wanted to I could get it up to 3000 rpm usually. Something with the fuel maybe? But not sure how that would have caused the engine to smoke
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Re: Universal m-18 engine compartment smoke

Smoke, smells and sounds are your tells.
I thought something may have been rubbed by the shaft when under power. May e something loose..zip tie broken etc

Have somebody watch it as you power along.

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post #7 of 13 Old 09-28-2019
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Re: Universal m-18 engine compartment smoke

Running the engine @ the dock w/o a load won't tell you anything other than you have ample water flow for no load.
Sounds to me like you might have lost an injector or a ring. Check your oil for water.
Trying to get to full no load RPMs when you don't know what caused the problem in the first place is not a good idea. If you don't know diesel engines, call a good (and perhaps expensive) mechanic before you turn a relatively small problem into a big one.

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post #8 of 13 Old 09-28-2019
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Re: Universal m-18 engine compartment smoke

Smoke in engine compartment due to bad injector or rings...probabaly not.
Running at dock would make chasing an elec prob easily apparent
Something else caused this.
He can prob chase this down.

Engine manuals can be had online.
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post #9 of 13 Old 09-28-2019
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Exclamation Re: Universal m-18 engine compartment smoke

Did you check your alternator to see if it has any output? You could also put your nose to it (and perhaps the regulator, if it is external) to see if they smell burned (not when running, unless you have a death wish for your face). Other than that, if it isn’t obvious what the problem is, I’m with capta—get someone in who can help with the diagnosis.

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post #10 of 13 Old 09-29-2019
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Re: Universal m-18 engine compartment smoke

Does your Universal engine still have the "trailer" connectors in the wiring harness? That could be a cause of the electrical smell.
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