DCR Posted January 23, 2011 Share Posted January 23, 2011 What should the normal running temp be on a END673 engine? I have a 1958 B61 and let it run today for over an hour at 1500 RPM and the temp gauge only went to the first line past the 100 mark. I am assuming that this is the 100 degree mark. The whole time the engine was running the shutters were closed tight and I was not getting any heat from the defrosters. I am thinking that I need a new thermostat. What is the proper temp setting for the thermostat or is there something else I should look at. Thanks.Denny Quote Denny330-550-6020A "Mack Pack" Charter Member Link to comment Share on other sites More sharing options...
Rob Posted January 23, 2011 Share Posted January 23, 2011 What should the normal running temp be on a END673 engine? I have a 1958 B61 and let it run today for over an hour at 1500 RPM and the temp gauge only went to the first line past the 100 mark. I am assuming that this is the 100 degree mark. The whole time the engine was running the shutters were closed tight and I was not getting any heat from the defrosters. I am thinking that I need a new thermostat. What is the proper temp setting for the thermostat or is there something else I should look at. Thanks.DennyIt prolly doesn't have a thermostat. I like cardboard in front of the radiator but you need to be careful and watch the temp. They seldom warm up at idle in the winter. You would need to load the engine down to generate heat into the cab.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
hatcity Posted January 23, 2011 Share Posted January 23, 2011 A) What is the outside air temp? Do you have a valve for the defroster? Open or closed?3) No load on motor Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
oldmacktrucks Posted January 23, 2011 Share Posted January 23, 2011 I would say a 180 thermostat would work, but not sure about B-models. My old DM600 (the 73 truck) has shutters and a 180 stat and the heat cranks. My engine is an old 237. Hope this helps...if you do have a thermostat it might be stuck open, this has happened to me countless times Quote Link to comment Share on other sites More sharing options...
randyp Posted January 23, 2011 Share Posted January 23, 2011 Loaded up and pulling in winter, mine will run around 180, and in hard pulls might do 185 or 190. I would guess its a 180 thermostat, it has shutters also. It wont get very warm, even cranked and left idling in winter, shutters wont ever open just idling. randyp Quote Link to comment Share on other sites More sharing options...
DCR Posted January 23, 2011 Author Share Posted January 23, 2011 Thanks for the replies. I can't take the truck out for a hard drive since my generator isn't generating and the truck will stall from dead batteries after about a 30 min run. Still working on that problem. I ran it today at 1500 RPM for an hour, with battery charger attached, thinking that it should heat up in that time frame. Maybe that was not enough time in 12 degree temps. Are there two motors for the heating system - one for heater and one for defrosters? When I pull the defroster switch I can hear a motor running but when I look in the heater box on the passenger side the fan motor in there is not turning with the heater switch on.When it warms up, I will pull the thermostat and replace it with a 180 degree one and see what happens. I could feel engine heat radiating from the firewall but no other heat from the heater. It is just too cold to start tearing things apart and working on it. Denny Quote Denny330-550-6020A "Mack Pack" Charter Member Link to comment Share on other sites More sharing options...
Rob Posted January 23, 2011 Share Posted January 23, 2011 Thanks for the replies. I can't take the truck out for a hard drive since my generator isn't generating and the truck will stall from dead batteries after about a 30 min run. Still working on that problem. I ran it today at 1500 RPM for an hour, with battery charger attached, thinking that it should heat up in that time frame. Maybe that was not enough time in 12 degree temps. Are there two motors for the heating system - one for heater and one for defrosters? When I pull the defroster switch I can hear a motor running but when I look in the heater box on the passenger side the fan motor in there is not turning with the heater switch on.When it warms up, I will pull the thermostat and replace it with a 180 degree one and see what happens. I could feel engine heat radiating from the firewall but no other heat from the heater. It is just too cold to start tearing things apart and working on it. DennyThat diesel does not need an electrical source to keep running. If it is stalling there is another problem. If the engine is stalling at a common time each time, change your fuel filters. I've seen them pull sludge and grime up from the tanks that plugs filters when running. When not running the heavier components of the "dirt" fall from the media and the fuel can flow once more.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
DCR Posted January 24, 2011 Author Share Posted January 24, 2011 RobWhen it stalled I was coming to a stop for a traffic light or making a sharp right turn. It was my fault. But the engine would not turn over due to batteries. Jump batteries and started right up. I need more seat time for shifting experience.Denny Quote Denny330-550-6020A "Mack Pack" Charter Member Link to comment Share on other sites More sharing options...
randyp Posted January 24, 2011 Share Posted January 24, 2011 Denny, if it is generator equipped, unlatch brush cover on rear of generator and spray lectra clean and run commutator cleaner stick against commutator while engine is running. It could be brushes stuck or commutator dirty. I have to do mine that way every now and then as power steering pump is mounted behind generator and leaks just a tiny bit, soiling commutator. I do agree with Rob, dead batteries wouldnt stall that engine, just make it a pain when it does stall. randyp Quote Link to comment Share on other sites More sharing options...
DCR Posted January 26, 2011 Author Share Posted January 26, 2011 My generator problem is solved. I pulled the generator and took it to a local electrical shop for testing. They cleaned it and then tested it and said it was good. I reinstalled it thinking that I had some other problem, started the truck and the amp gauge was showing around 30 at 1500 RPM with all the lights and heater on. Thanks for all the help on this issue. Now on to my next item - getting heat in the truck. The heavy paper/cardboard defroster diffuser is shot. What little warm air I am getting is being dumped into the dash and never reaches the windshield. What have others used to replace this unit? Where can I find a replacement?Denny Quote Denny330-550-6020A "Mack Pack" Charter Member Link to comment Share on other sites More sharing options...
Lmackattack Posted January 26, 2011 Share Posted January 26, 2011 I think watts mack has the heater ducts for sale. Quote Link to comment Share on other sites More sharing options...
DCR Posted January 26, 2011 Author Share Posted January 26, 2011 Thanks for the help. I checked Watts website and they carry them. Will order todayDenny Quote Denny330-550-6020A "Mack Pack" Charter Member Link to comment Share on other sites More sharing options...
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