1984 Dodge, intermittent overheat?

rwise

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Ok in the last 6 months it has done this 3 times, the first time I was moving and working it hard. This time the top radiator hose split out 2" wide and a foot long. The thermostat was replaced as was the pressure cap and hose of course. The second time I was on the turnpike running somewhere around 100 - 120 (speedo doesn't read that high) started getting hot and missing. Slowed down and ran the heater, it cooled right down, but was missing. Three spark plugs and three plug wires were bad, replaced all plugs with platinum plugs of the same heat range, and helical wound wires. Yesterday, coming back in to town running 80 mph got hot fast and blew the top tank off the radiator. Now this aint one of those plastic tanks it's all metal! Got any ideas here? I'm thinking I'm gona pull the whole top off the engine, replace the cam (cause I have it) lifters (can't hurt and I have them) timing gears and chain, heads, water pump (which is about a year old) belts and hoses, can you say shotgun! LOL<br /><br /><br />Oh ya, gone to go get the truck,,,,,,,,, :rolleyes:
 

heycods

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Re: 1984 Dodge, intermittent overheat?

First thought is, sir you got a lead foot. Next if your gonna do all that to it thier is no way I would go that far into the motor without doing a complete overhaul Rings Inserts cam bearings, and mikeing shaft and cyls.<br /> I dont know how many miles you have on it, But never do a valve job on a motor with high or med high miles on it. Just asking for trouble. broke rings ect. When you change heads, you will of course have a valve job on the new ones, that is going to increase compression which in turn causes the rings to flex more,then they brake.<br /> which engine 360 or 318. I have a good elderbrock high rise that came off my old motorhome, its taking up space in my junk pile?<br />Its off a 360. <br /> I had a dodge 84 mod. 3/4 ton with a 360 in it. I pulled the 360 and droped in a 383 out of an old chrystler in it, she was quite the runner.
 

dolluper

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Re: 1984 Dodge, intermittent overheat?

What's the condition of the RAD???or maybe wrong temp of stat need a 160 running that hard
 

deputydawg

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Re: 1984 Dodge, intermittent overheat?

So many possibilities. Could have been a plugged radiator or enough junk in the cooling system to plug up the water ports.<br /><br />Sounds like a problem we used to have when I was running stock cars. At high speeds the water is circulating too fast. The water needs to stay in the radiator for a few minutes to cool. If circulating too fast it will overheat, until the RPM's come down.<br /><br />I would go ahead and pull the engine while replacing the parts. Changing what you are going to will not eliminate the heating problem. Pull it and have it boiled out at machine shop. When you put things back together, go with new water pump. Replace both radiator hoses and heater hoses in case they are collapseing. Finally check and replace all belts. They may be slipping at high RPM's.
 

rwise

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Re: 1984 Dodge, intermittent overheat?

Originally posted by heycods:<br /> First thought is, sir you got a lead foot. Next if your gonna do all that to it there is no way I would go that far into the motor without doing a complete overhaul Rings Inserts cam bearings, and miking shaft and cyls.<br /> I don't know how many miles you have on it, But never do a valve job on a motor with high or med high miles on it. Just asking for trouble. broke rings ect. When you change heads, you will of course have a valve job on the new ones, that is going to increase compression which in turn causes the rings to flex more,then they brake.<br /> which engine 360 or 318. I have a good elderbrock high rise that came off my old motor home, its taking up space in my junk pile?<br />Its off a 360. <br /> I had a dodge 84 mod. 3/4 ton with a 360 in it. I pulled the 360 and dropped in a 383 out of an old Chrysler in it, she was quite the runner.
lead foot, just a bit :D I was thinking of refreshing the motor this year anyway, but I was wanting to wait for warmer weather, the shad tree has no leaves :rolleyes: but if you want to get that intake out of your way email me at r54w04(at)yahoo(dot)com looks like I'll be doing the overhaul sooner than I wanted.<br /><br />
Originally posted by dolluper:<br /> What's the condition of the RAD???or maybe wrong temp of stat need a 160 running that hard
I had put an over sized (larger with more cores) in it because the original started leaking and I had it. But the tank is blown almost off the top now. It was fairly clean inside.<br /><br />
Originally posted by deputydawg:<br /> So many possibilities. Could have been a plugged radiator or enough junk in the cooling system to plug up the water ports.<br /><br />Sounds like a problem we used to have when I was running stock cars. At high speeds the water is circulating too fast. The water needs to stay in the radiator for a few minutes to cool. If circulating too fast it will overheat, until the RPM's come down.<br /><br />I would go ahead and pull the engine while replacing the parts. Changing what you are going to will not eliminate the heating problem. Pull it and have it boiled out at machine shop. When you put things back together, go with new water pump. Replace both radiator hoses and heater hoses in case they are collapsing. Finally check and replace all belts. They may be slipping at high RPM's.
If it happened gradual and regular I would go with the radiator partly plugged up, but it only happens about every 2 months, 3 times in all that it has overheated on me. coolant moving to fast through it was also an idea I had, but then it would do it all the time. I am on the turnpike at these speeds at least every other weekend and most of the time it's fine, but when it ain't :( and I am most likely going to pull it for a refresh, but it's only got 150,000 on it :rolleyes: also belts and hoses have been replaced in the last year, ya I know it doesn't make them good,,,,,,,<br /><br />I got it, the girl friend is going to have to move closer :D :cool:
 

heycods

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Re: 1984 Dodge, intermittent overheat?

Dog may have your Prob on the radiator hose thing. Make sure the bottom hose has a spring in it. I had one that sucked shut on a 427 ont time, only happened under lead foot conditions. It probably has something to do with a stopped up Rad. With the top blew off you out to be able to see in it and tell now.
 

rwise

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Re: 1984 Dodge, intermittent overheat?

the bottom hose is less than a year old and does have a spring in it, but I will put all new on! The top is 5 months old. As far as checking things out, I have had no time to look at it yet. Got it home yesterday about 2:30 and had to be at my daughters wedding at 5. I have seen the bottom hose collapse before also. I may just pull it this weekend and drop in a spare 360 I have, make the other repairs and run that until I can do a full rebuild! And a few mods like electric fans, good time to do that since I have to buy parts anyway. :rolleyes:
 

heycods

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Re: 1984 Dodge, intermittent overheat?

Rwise you have mail from heycods or lwr
 

surlyjoe

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Re: 1984 Dodge, intermittent overheat?

have you done an exhuast gas check on the cooling system? sounds like it may be leaking exhaust gas into the cooling at temp.
 

rwise

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Re: 1984 Dodge, intermittent overheat?

Actually, no, but that couls explain a bit of it. At this point I am pulling the 318 and dropping in a 360 that my son is going to put in a 65 dart. I'll run that while I do a rebuild on the 318! That should take care of anything thats wrong! Update a few systems while I am at it, TBI, electric fan/s etc.
 

surlyjoe

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Re: 1984 Dodge, intermittent overheat?

I bet you blew a gasket running it hard. make sure you spend the extra for the good gaskets on the rebuild if your going to be driving it hard.
 

deputydawg

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Re: 1984 Dodge, intermittent overheat?

That was my next suggestion. Blown head gasket, cracked head or cracked block. I have seen cracked heads that will only open and cause problems under certain conditions.
 

rwise

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Re: 1984 Dodge, intermittent overheat?

could well be a cracked head, but I want to change them out anyway, put heads from a 360 on it for free flow (bigger valves). <br /><br />Yes all part will be high quality! If I'm gonna overhaul it no need to short cut here! The truck has been good to me, held up for 8 years of my lead foot! Its worth the rebuild :rolleyes: ;)
 
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