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68’ Chrysler will not heat up |
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Barr 68 
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 Topic: 68’ Chrysler will not heat upPosted: May-23-2005 at 2:34pm |
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I ran my 68' Cuda for the first time last week and it ran great for the most part . The water temp never got above 90 degrees. I checked the thermostat and found it was installed upside down by the previous owner. I checked the thermostat in hot water before reinstalling and it worked perfect. The problem is when I ran the boat in the driveway on hoses it still did not get above 80 degrees . The gauge seems to be working properly. Whats the problem? Is there too much water flow for the engine to heat up with the forced water flow of the hoses? Any one else experience this with 1968 Chrysler 318's? Thanks for any help/ideas, Jim
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Dninty9
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Posted: May-23-2005 at 9:41pm |
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I would replace the Thermostat just to be on the safe side ....As I might be opening at a lower than normal temp..Just my Idea..
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74 Skier
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Joined: March-11-2005 Location: United States Status: Offline Points: 35 |
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Posted: May-24-2005 at 4:58am |
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Yeah man I would replace the thermostat. It may have a car thermostat in it, and not one for raw water!!
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Barr 68
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Posted: May-24-2005 at 8:55am |
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Thanks for the input. The thermostat is the correct type and is openning fully at about 135 degrees. Any other thoughts as to the source of the problem? Thanks again,Jim
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: May-24-2005 at 10:39am |
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Your guage could be bad.
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Tim D
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Joined: August-23-2004 Location: United States Status: Offline Points: 2641 |
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Posted: May-24-2005 at 11:23am |
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If the thermostat was put in backwards, it would run hot because cool water touching the wrong end. While you have it running in the driveway, did you see the exhaust water steam once in a while? Before you replace the gauge, I would replace the sending unit that screws into the intake. It has a coil that could break on the inside, and it is cheaper.
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Tim D
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reidp
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Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Posted: May-24-2005 at 12:06pm |
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Barr68,
One other item you could check on this. These older Chryslers (pre-1975+/-) with the dual impeller water pump have a temp sending unit on both the intake AND one exhaust manifold, both tied into the same temp gauge. This is because one impeller feeds water constantly and directly to the manifolds and one sending unit records that, while the other impeller feeds the engine, and ultimately dumps into the exhausts. The highest temp apparently rules the gauge. With good cold water flowing thru the exhausts it may never get alot warmer at the sending unit on the front end of the exhaust, I don't know, esp on the trailer idling. You may want to check the sending unit on the intake, or swap them to see if it changes anything. I toasted a '68 318 by not realizing this. By the time I finished with the incorrect assumptions, the block and heads had overheated and subsequently cracked the heads. I've still got the assembled 318 short if anyone's interested. Lessons learned. |
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Barr 68
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Posted: May-24-2005 at 1:02pm |
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Thanks for the ideas. The thermostat and housing on this engine are different from any others I have seen in the past .Rather than a auto type that simply opens and closes within itself , this thermostat unit has a cylinder integtral to it that moves up when heated to connect an upper gallery in the the thermostat housing to a lower gallery which is fed by the impeller. When the thermostat is installed upside down the water from the impellor simply freeflows through the system. I disconnected the sender wire from sensor while the engine was running to see if the gauge would stop working and it did. The other reason I think the gauge is good is the engine block is cold even after running for 5 min on the garden hoses inthe driveway. I notice that the water intake hoses branch off to feed the back side of the exhaust manifolds before continuing on to the impellor intakes. Is it possible that it is back feeding the pressurized water thru the manifolds and the rest of the system when running on the garden hoses? Thanks for all your ideas/help. Jim
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reidp
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Posted: May-25-2005 at 1:43am |
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Jim,
If you haven't already, review the Chrysler engine manual in the reference section to see if yours is plumbed correctly. Also, while running with the hose, are you getting water water to each of the two water intakes/impellers as you do have two pick-ups, do you not? Make sure water is getting to both so that one isn't run dry. |
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