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hardin marine thermostat housing wont warm up

Old 04-29-2021, 01:03 PM
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Is the top of the intake possibly painted where it mates to the T-stat housing and gasket??
The sender grounds through the crush rivets in the tstat gasket. Did use sealer on the sender?? Can't do that or it won't ground.
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Old 04-29-2021, 01:09 PM
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I had a cooling issue and looked at that same aftermarket thermostat housing - i skipped it because I already had a problem I was trying to solve...
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Old 04-29-2021, 01:55 PM
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mechanical gauge mounted in intake manifold next to stat housing
Did say its starts at 130
If your sure the gauge is accurate
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Old 04-29-2021, 02:24 PM
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Tested gauge prior to starting. Water pump hose and intake water passage gets warm to touch just not warm in up rest of the way for some reason. Gonna change stat cause itís not new. Just looking for some crazy thing someone else may of had. This is actual set up


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Old 04-29-2021, 02:31 PM
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Look like a Oil temp gauge
Water temp would be no higher then around 240
Head gasket blows around 210 - 220

Either way its still cold
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Old 04-29-2021, 02:50 PM
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I'd still be concerned about 190F. There is no room for error.
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Old 04-29-2021, 02:58 PM
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We are getting hung up on the temp for some reason. Iím more worried about getting the temp up to where itís stated And why or how it could be bypassing and not letting water stay in block long enough to warm up
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Old 04-29-2021, 03:44 PM
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Been looking for a exploded view of the internal paths in the housing, but unable to find. The main flow from the intake should be separated by the bottom of the thermostat. There would be a small bypass hole used to allow air to escape

At this point I would remove the housing and see if the port is to large or its open between the raw water side and the motor



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Old 04-29-2021, 03:52 PM
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Also the spacer (item d) must stay fully up against the thermostat when fastened to the intake. If it doesn't water just keeps circulating around the thermostat
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Old 04-29-2021, 04:44 PM
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Does the actual temp probe stick down below the reducer adaptor? (as in submersed in water). If it is fully shrouded it may be reading the manifold metal temp not the water temp.
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