Piston lock cad 42 possible causes

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captaindan

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Hi there
So. I have a little problem with my cas 42 which has got piston lock. I am presuming it’s possibly from the bellows exhaust bend but am not completely sure.

I have taken the injectors out. But am not sure on how to check or get the water out. Was gonna get the water out and then perhaps poor some oil down them Before boxing back up any help and suggestions would be great as I am stuck in France Trying to transit back to the uk

thanking you in advance for your responses and advice

cheers dan
 
Years ago I inadvertently filled a car engine with water (stop laughing at the back) to get it out I did the following:
Get most of the water out of the cylinders with a cheap hand pump and some plastic pipe etc. Then when you are happy there is no way any serious water can get back in! spin the engine on the starter and it will spit out any dregs left. then try and spray some oil around the sides of the pistons and spin it on the starter again. (aerosol spray oil with a tube - bend the tube so it goes sideways when its in the cylinder)

After refitting the injectors, if you can get it started that will immediately get rid of any water etc. Better check/change the oil too. Any idea how the water is getting in?
 
kashurst said:
Years ago I inadvertently filled a car engine with water (stop laughing at the back) to get it out I did the following:
Get most of the water out of the cylinders with a cheap hand pump and some plastic pipe etc. Then when you are happy there is no way any serious water can get back in! spin the engine on the starter and it will spit out any dregs left. then try and spray some oil around the sides of the pistons and spin it on the starter again. (aerosol spray oil with a tube - bend the tube so it goes sideways when its in the cylinder)

After refitting the injectors, if you can get it started that will immediately get rid of any water etc. Better check/change the oil too. Any idea how the water is getting in?
Click to expand...
Lol. How did you fill your car with water. I am thinking the exhaust bellow might be the culperit. But am not totally sure
 
captaindan said:
Lol. How did you fill your car with water. I am thinking the exhaust bellow might be the culperit. But am not totally sure
Click to expand...
flushing out the cooling system on an old renault. Thought I was putting the hose pipe into a cooling water hose - it wasn't it was part of the air induction system. oops!

as to your exhaust elbow best thing to do is take it off and see what it looks like.
 
This seems odd to me, the exhaust elbow don't just get water backflow to the cylinders. If water came that way something significant and specific must have caused it, almost intentionally pressuring water the wrong way when the engine was not running. The only accidental way I can think of right now was if the boat was sunk to the point where the sea level was above the elbow. A broken exhaust bellow do not create this problem.

Unless something did happen it's more likely coolant and the head gasket.
 
Just wondering wether it’s possible to havegot some water in while I was out in rough weather coolant is fine and engine is not overheating. I did try to drink some But I was full up and didn’t have a lot of room in my stomach. Got the mrs to do it who informed me it was salty
 
I wonder if he bumped it with the starter and it ran backwards for a brief moment. Simple diesels can briefly if not awkwardly and bumpily run in reverse. I've had Listers that pumped water on the farms nearly tear my arms out of their shoulder sockets when hand cranking them to start and the compression bump causes them to go into reverse.
 
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@A_8 Oh you know that one too. We also had one that generated electricity for the farm house. If you didnt start it first go you were in deep trouble as you had spent all your weetabix. If that one kicked backwards the crank handle was long enough to remove your front teeth. Everyone was afraid of it. Crank handle to the
left
MENGIN-001-800x800.jpg
 
Drifting from the main line of the thread (Sorry Dan) but I’m visiting my boat next week for the first time in 2 years and was thinking of bumping the engine before a full cranking start (KAD43‘s) just to get some oil circulating.
In light of the above I might just go for a starting crank.
 
you may have misunderstood. If the starter doesnt have enough torque (battery soft or bad connection etc) and the diesel ignites before the compression stroke is completed, then could the engine run backwards for a few cycles? I have never witnessed it on boats with large multicylinder engines but have on big singles and funnily enough on stopping small diesel engines aka those on yachts (cue inverted raw water impeller vanes) where it may bounce backwards a stroke or two. I just questioned if it would be a possible scenario. Hot engine, glowing carbon deposits on the valves. Shut engine down but flywheel momentum almost completes a stroke- mechanical pump- pre-ignition - bounce back one or two strokes. ...:unsure:... it could explain why raw water was in the cylinder. Not much else does unless he has a major leak in the CAC intercooler.
 
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