Westerbeke 21 Diesel Engine Question... - SailNet Community
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post #1 of 12 Old 04-13-2009 Thread Starter
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Westerbeke 21 Diesel Engine Question...

My other half and I just took out our heat exchanger and had it serviced with an acid bath, and had it pressurized. We went out motoring for about 2 hours after putting it back in and the boat ran fine. Now were overheating?!? While we were cleaning up our mess my other half knocked out a black female wire with a red piece of tape on it. Its on the lower left side....near the oil dip stick. We cannot figure out where this wire goes or if it has to do with our overheating. We checked the thermostat, raw water impellier, fresh water pump, and looked everywhere for leaks. The antifreeze is building up pressure and is actually pushing the tubing off!! Its going to 230+ temp within minutes. Were competely baffeled as to whats wrong and to where this wire goes. Does anyone have helpful advise for me??
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post #2 of 12 Old 04-13-2009
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Just curious, but is water coming out of the exhaust? If not, you either have a clogged intake, clogged raw water strainer or a blown impeller.

The wire may not have anything to do with it...

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post #3 of 12 Old 04-13-2009 Thread Starter
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We do have water coming out the exhaust....a good amount not just a dribble. We checked the water strainer and impellier they are both good. This whole thing is like one big mystery.

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post #4 of 12 Old 04-13-2009
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Do you have engine heated water heater? If so, you might have air still in the system.

We had an overheat after commissioning last year...ran fine for a while, then...pow.

We have a Westerbeke 18hp.

It's not whether you're paranoid...it's whether you're paranoid enough.

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We do have an engine heated water heater.....we'll have to get the air out and see if that works. Thanks!!
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post #6 of 12 Old 04-13-2009
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Good luck...I think I have the recommended process. I'll dig it up and post it for you.

It's not whether you're paranoid...it's whether you're paranoid enough.

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Thanks sooo much!!!!

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post #8 of 12 Old 04-13-2009
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Hmmm...can't find it. Don't recall where I read it...but, I did a quick search and found this thread on the Torresen Marine site. Gives the same procedure.

Good luck.

It's not whether you're paranoid...it's whether you're paranoid enough.

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post #9 of 12 Old 04-14-2009 Thread Starter
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Thanks!!

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post #10 of 12 Old 04-14-2009
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Are you loosing coolant(antifreeze)? Like from the pressure cap blowing and filling your overflow bottle.

If not, I suspect you may not really be overheating. Does the motor smell hot?

A cooling system with just 10# of pressure will make the rubber hoses almost imposible to squeeze.

SO---

First put more pressure on the hose clamp and maybe add another--

next--

The wire that you found may be for the temp sender and with it off you may be getting a bad reading.

Remember rule #1

The last thing you mucked with is the first thing to mess up.

Rick
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