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Erratic engine heating |
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meplante 
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Joined: October-03-2013 Location: Orange Park, FL Status: Offline Points: 28 |
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 Topic: Erratic engine heatingPosted: January-26-2016 at 11:07pm |
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Lately engine is having large swing in temp from 120 to 240. Had to sit at idle for 10 minutes to allow to cool. Ran at reasonable temp for 20 minutes then had quick swing to 240 again. Engine is Chrysler 273. Is this a sign of a bad temp stat.? Thanks
Mike |
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Mike P.
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baitkiller
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Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Posted: January-26-2016 at 11:15pm |
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Unlikely to be the stat. But the Mopar stuff has some really goofy plumbing. Double pocket pumps, two inlets etc. I would start with the impeller(s) and inspect for loose hoses, clamps etc. I am no expert on these but one or more will be along soon. I just didn't want you to strip the thermostat when they almost never are the culprit.
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Jesus was a bare-footer.............
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: January-27-2016 at 6:10am |
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Mike,
I almost missed your post. I should take a look in the "new" forum section more often but did using the "new posts" ran across it.. Did you ever change both impellers back in 2014 when you had a similar problem? If so, what was their condition? I'm also wondering if you still have any acorns or impeller pieces still in the system on the suction side of the cooling system? You by chance, haven't been running the engine even briefly out of the water without water hooked up. The impellers being water lubricated will self destruct without water. It doesn't take much. |
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dave12gauge
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Joined: April-06-2015 Location: California Status: Offline Points: 34 |
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Posted: March-17-2016 at 3:20am |
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Not sure if your cooling system is like mine, but if you have a small bypass hose going from your intake manifold to your circulation pump there might be an obstruction. Took awhile to figure out but you need to take the hose off and poke wire or something to make sure its clear. Don't forget about both barb fittings. I did a visual and only when I pulled it off did I see it. Good luck
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: March-17-2016 at 8:49am |
David, As mentioned, the Chrysler marines were plumbed differently than the typical marinized engine and quite different than your BB. We do however appreciate your input I'm not sure if Mike found his problem or not since he hasn't been back on the site in some time. I wish he would since I and I know others sure like to hear if we've helped or not. From time to time we do get new members joining, asking questions and then disappearing. |
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meplante
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Joined: October-03-2013 Location: Orange Park, FL Status: Offline Points: 28 |
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Posted: March-23-2016 at 12:55am |
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Well since my mechanical ability usually comes to a quick halt after spark plugs, belts and hoses I hauled our Mustang into the shop in Melrose, FL. Hoses were inspected for acorns and such but none were found. Ended up with a new thermostat and is running within safe range again. The shop did find something that appeared odd. The temp gauge was wired into two different sensors from the engine. The shop owner also said that the Chrysler marine engines had a fairly complicated cooling system. . We have put 6 hours on the boat since getting back last week, so far so good.
Mike 
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Mike P.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: March-31-2016 at 8:33am |
Mike, It's great to hear that the T stat solved your problem. I'm surprised since the typical T stat fails in one position and doesn't cause the temperature swings you described. I recommend finding another shop that knows Chryslers. before they hack up the engine. They obviously don't know about Chryslers and the dual station temperature senders. |
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meplante
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Joined: October-03-2013 Location: Orange Park, FL Status: Offline Points: 28 |
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Posted: April-01-2016 at 12:05am |
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Thanks for the advice! Any suggestions in the Jacksonville, FL area? Also I probably need to buy the tech manual for the engine, do you know a source? Thanks Mike
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Mike P.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: April-01-2016 at 11:24pm |
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Mike,
Take a look here for the specific manual for your Chrysler. There's one in the reference section but it doesn't cover your 273. I don't think there's much difference between it and a 318 but I'm not sure. Others may have a good idea for someone in your area that knows Chryslers. |
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dave12gauge wrote: