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Crusader 270 overheated

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chillee

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"Hello all i'm a newbe to

"Hello all i'm a newbe to boating,the boat i was interested in was a 1994 silverton 31c with twin crusader 350 cid engines velvet drives,during the sea trial the port engine overheated and shut down .My question is does this model have a high temperature safety shut down,or is this a major problem and i should walk away from this boat"
 
"most all come with an overhea

"most all come with an overheat warning horn and some of the newer computer controlled engines have a 'limp home mode' that can operating temp driven.

If its due to lack of maintenance, it can be "expensive" depending upon the parts impacted by the neglect. I wouldn't label it as a major problem.

I you like the boat, get the owner to fix it before you buy it. If he wants to sell it, it should be fixed in a week or two, depending upon the backlog at the yard chosen."
 
"I checked the wiring diagram

"I checked the wiring diagram for the crusader 270 engine and found a high temp switch in the pictorial electrical schematic,however the diagram did not show if it just illuminated a warning light or if it interupted the engines ignition wiring?"
 
"if you looked at the engine d

"if you looked at the engine diagram, there should have been three switches in parallel - overheat, lo oil pressure and gear overheat.

On the "instrument panel" is where you can find the 'other' end of the overheat circuit. the switches provide multiple ground paths for a buzzer or horn. the horn is fed from the key switch, usually from the IGN terminal. (a light can be hooked up parallel to the horn.)

This circuit has no Control over the engine."
 
looking for answer to a high temp switch. I have 2006 crusader 6.0 captains choice. Closed cooled system. Running 170-175 at cruising but still getting a high temp alarm going off. I don’t see a dedicated alarm switch in the manual and was wondering if the temp SENSOR is what they used through the ECM to set the alarm.
 
it depends upon how the engine was installed...there is the default - use the ECU to drive the warning horn and then there are options. One of those options is to use an independent set of temp and pressure switches to drive a stand alone alarm...

Have you check to see what is under the dash and on the engine?
 
I have referred to the crusader manual to see what to look for as far as sensors for temp. All I see is temp sender for gauge and temp sensor. Optional exhaust gas sensor that I don’t have. I don’t see any other optional sensors in the manual. I believe at the dash there is an indicator light, which I don’t believe is working and the manual says the alarm will sound in different patterns depending on what the issue is. The sound I’m getting is for high engine temp
 
In the 2006 owner's operation manual, page 16, section entitled ENGINE ALARM SYSTEM (IF EQUIPPED):

" NOTICE: Some boat builders may install their own
alarm system. It is recommended that the boat owner
check with his or her boat dealer for an explanation of
the particular alarm system upon initial delivery. "

(If Equipped) typically refers to optional equipment.

the text prior to the notice (and other data in that manual) tell you the PCM will sound its audio alarm if the coolant sensor reading indicates the coolant is 200 deg F or higher.

I think 2006 was the last year the gauge sending unit was factory installed; 2007, they went with the 'next generation' ECU.

So if your water temp gauge is normal, and you only have the ECU driven warning horn (BEEP-BEEP at KEY ON), I'd suggest getting the ECU scanned to find out what the ECU 'sees' the coolant temperature to be...I'd also suggest getting an IR gun and doing a quick scan on the engine...two sensors showing different values means you have a problem...two (out of three) sensors showing the same value (within normal tolerances) indicates the oddball is bad.
 
Thanks Makomark. I’ll see if the tech at my marina has a scan tool for that engine and I’ll have him check the temps while he’s there. Greatly appreciated.
 
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