D1-20 manual

Thanks ,but thats just a parts list for consumables.

Any idea where the temperature sender is so that I can check it out?

Also, how can I check out the freshwater pump?
 
The diagram on page 46 of the owners manual shows where the temperature sensor is!
What do you want to check on the fresh water pump?
 
I need to check whether its working sufficiently as my overheating alarm keeps sounding, there's water coming out of the back, its not the (new & checked) impeller and the thermostat opens and closes ok, and even without it in yesterday I had the overheat alarm sounding. Its seems temperamental, running the engine in gear in the marina for an hour it was all ok but ten minutes after restarting engine on return leg from Brightlingsea it sounded again.
 
And This diagram shows the water pump.

No parts listed for it as far as I can see. /forums/images/graemlins/frown.gif I bet a new one costs a whole mortuary full of arms and legs!

Part #2 is the temperature alarm switch
 
Ok so now we are getting there. It's overheating! apparently.

Does the alarm sounding agree with a high reading on the temperature gauge

Have you checked out the seawater side. Are you sure you are getting the full seawater flow there was when it was all new.

Are the inlet, strainer, and exhaust injection point clear and free of obstructions.

Is the heat exchanger scaled up?
 
I dont have a seperate temp guage, I guess that'd be a good investment.
Sea water is getting through but seems only tepid when I hung bucket over the stern at 2000 revs and collected a gallon in about a minute or less. Is that normal?

I've taken the thermostat out now in the expectation that that was the problem but alarm sounded again yesterday without it in.
Could it be just a poor electrical connection to that sensor?

Any other ideas?

Thanks for your help.
David
 
I assumed that the "temperature switch" was for an alarm or warning light and the temperature sensor was for a gauge. Not so as I now realise. I haven't a clue why there are apparently two different sensors. I guess it's the one on the pump that brings up the alarm.

I am also finding details of an exhaust temperature alarm fitted to an exhaust hose. but no mention of it as far as I can see in the manual

VP used to put a full wiring diagram in the owners manuals but sadly not now

It could be the sensor that is faulty. A poor connection would just result in it not operating I think.

I cant think that there could be problem with the freshwater pump. If they go round they pump, if a seal goes they leak.

If the water leaving the exhaust is only tepid then there does not seem to be a problem with its flow other wise it would be hotter.

You have determined that the thermostat is not the problem.

Scaling or corrosion of the freshwater circuit should not be an issue.

Leaves two possibilities. Defective temperature switch or a scaled up heat exchanger (seawater side).

Ideally you need to be able to measure the temperature to see if it really is getting too hot or if it is a faulty sensor.


There's an interesting comment in the current thread on an overheating alarm on a 2001 that refers to air locking due to blocking of a connection between heat exchanger and header tank. I wonder if you have a similar problem.
 
I guess my approach will be to see which electrical connector is present on the engine 1 ( from page 46) "Engine coolant switch" or 3 "Engine coolant sensor"

I'm not clear what the difference is but maybe something has been lost in translation.

Then if I get a temperature gauge from a chandler I should be able to fit it & feel more confident about the actual temperature.

Although I had a fine wind from Dunkerque and across the channel it would have been nice to have had confidence that the engine would see me into Ramsgate. The gale warning half way across didn't help, but with three reefs and a handkerchief of fors'l it turned out to be a cracking good sail !
Although deciding to take the thermostat out in the black deep did cause me some anxiety since that's where the VLCC's make their approach. Still no wind and no engine = no option !

Regards
David
 
I see it has been confirmed in your other thread that the temperature alarm switch is the one on the top of the water pump and that the puzzle about the temperature sensor is cleared up to. I wondered if it was for an gauge to be fitted as an extra but it was not mentioned anywhere I looked. Sometimes the accessories are in the parts lists.

A gauge will be a lot more useful than just warning light and it will give you something extra to worry about!
 
Thanks.
Looking at the engine today it has a single brown wire which when disconnected sends an alert message to the display. Electrically this seems to be fine.
Then there is another (plugged) hole on top of the freshwater pump which appears to be there for subsequent fitting of a temperature sensor which must be connected to a gauge.
In order to eliminate these I have ordered both a new switch and temperature sensor & gauge.
(Running the engine today for an hour at 2000 revs produced no alarm)
 
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