Temp gauge reading hot.

[Cyborg Pirate]

Yesterday driving House boat in on a windy day.... Had to run the rpm around 3000. Normally keep
Them at 1400. Temps were fine abt 140-160 entire hour long trip in. Stopped to pump out before going into slip. 5 min ride to slip temps read 220. Engine didn't look or smell hot. Water discharge from impeller was flowing fine. Let it cool off. Idled the motor again and temps on gauge went up to 200-220 again. Today changed impeller to be safe, thermostat is only 6 months old but taking the housing apart now to check for restriction. But replacement kit I have has only one gasket. Needs two. One for the housing and another for the marine center piece between a regular 305 motor and a marine application for the risers water flow. Where do I gat another gasket? And also any ideas on what else could cause this? Can a temp sending unit go bad like that?

 

[alldodge]

Re: Temp gauge reading hot.

Yesterday driving House boat in on a windy day.... Had to run the rpm around 3000. Normally keep
Them at 1400. Temps were fine abt 140-160 entire hour long trip in. Stopped to pump out before going into slip. 5 min ride to slip temps read 220. Engine didn't look or smell hot. Water discharge from impeller was flowing fine. Let it cool off. Idled the motor again and temps on gauge went up to 200-220 again. Today changed impeller to be safe, thermostat is only 6 months old but taking the housing apart now to check for restriction. But replacement kit I have has only one gasket. Needs two. One for the housing and another for the marine center piece between a regular 305 motor and a marine application for the risers water flow. Where do I gat another gasket? And also any ideas on what else could cause this? Can a temp sending unit go bad like that?

Could use a engine serial number, or at least a year of the engine/drive your working on for gaskets.

The issue with your gauge, may be your gauge or the sender. Temp sender reads around 30 ohms at 200 plus degrees, and 600-800 ohms at room temp. Check the gauge by grounding out the temp sender lead and it should show hot, then remove the ground and it should show cold. Check the sender by measuring it cold, put it in a pan of water or get the engine warmed up and check with the wire off.

 

[Cyborg Pirate]

Re: Temp gauge reading hot.

Thank u. Yes it was the sending unit

 

[tazrig]

Re: Temp gauge reading hot.

That extra gasket you should be able to get at almost any boat yard. They always have a box of extra parts lying around.