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Old 15-07-2015, 00:36   #1
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FNM CMD ENGINE

Hi all.
My NEW Fiat FNM, CMD Engine has gotten water into the sump again! I'm just about ready to pull it and throw it.
Does anyone know about these critters or know someone who does?
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Old 15-07-2015, 04:19   #2
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Re: FNM CMD ENGINE

Salt water or coolant?

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Old 15-07-2015, 04:43   #3
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Re: FNM CMD ENGINE

Pretty sure it's coolant.
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Old 15-07-2015, 16:14   #4
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Re: FNM CMD ENGINE

Ouch! Get yourself 100% sure. Does it fill up while sitting unused, or only when it running. Is it random or regular. Has the water emulsified the oil, or did you catch it before you ran the engine?

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Old 15-07-2015, 17:51   #5
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Re: FNM CMD ENGINE

The start of the saga; I flooded the engine with raw water. I got that all sorted. Did everything properly. Then got the engine running, all sweet. I ran it up to operating temp a few times. All good. The missus had to move the boat while I was away, she done a good job. She checked the oil before start up, OK. Then she checked the oil again and it was emulsified. Haven't ran it since. I haven't drained the oil yet. I'm too sick to look at it.
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Old 15-07-2015, 18:04   #6
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Re: FNM CMD ENGINE

I can't even get an oil filter for it. Darned if I can get a head gasket.
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Old 16-07-2015, 05:23   #7
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Re: FNM CMD ENGINE

I had something similar. A faint, and hopeful possibility is that there was water sitting in the bottom of the sump before it was started. Hard to notice sometimes. Then running it emulsified it. If that was the case it could be a simpler problem like raw water syphoning into the engine somehow. I guess either way you gotta get the muck out of it before the bearings start to rust. Hope you get better soon.

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Old 18-07-2015, 23:26   #8
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Re: FNM CMD ENGINE

G'day mate,
I flushed it with diesel before filling with oil. I had a radiator pressure test gauge on it and it was leaking pressure.
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Old 19-07-2015, 01:04   #9
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Re: FNM CMD ENGINE

G'day,
There is one way to find if you are dealing with direct flooding of coolant into a cylinder or not. Remove all injectors place over the holes dry clean cloth, then crank engine over, look for a damp cloth this will indicate a leaking head gasket, cracked head, leaking exhaust manifold/gasket or leaking injector sleeve if fitted, this will cost you nothing.
If test is unsuccessful, remove coolant heat exchanger, oil cooler also fuel cooler if fitted.
A good engineering shop such as Diecon Engineering Brisbane will be able to test correctly, also repair if necessary. I am not familiar with FW circ pump setup on your engine but this is a another possible leak source.
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Old 19-07-2015, 01:41   #10
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Re: FNM CMD ENGINE

It would also be interesting to see if you are getting any blow back bubbling into the coolant with the cap off? The coolant level also should have dropped. It would be interesting to do a test on the oil. Anybody know an easy way to check, ie can you buy test sticks for salt or antifreeze?

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Old 19-07-2015, 01:50   #11
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Re: FNM CMD ENGINE

Hi Doug,
You're spot on mate. A nice spray of water out of 3&4.
At least now I KNOW I'm not taking the head off for nothing.
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Old 19-07-2015, 01:53   #12
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Re: FNM CMD ENGINE

Sad to hear that. Hopefully it is just the gasket. My old bukh had a corroded/cracked head. good luck.

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Old 19-07-2015, 02:49   #13
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Re: FNM CMD ENGINE

Thanks mate,
It'll be what it'll be.
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Old 19-07-2015, 03:24   #14
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Re: FNM CMD ENGINE

When you remove riser from the exh manifold end look for a snail trail in the carbon it will indicate raw water back feeding
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