I did some discing today with my MC and she kept getting warmer and wamer. She got right up to about 225 but never did make it to 230. I got a book with it when I bought it but danged if i can find it. I assume that 230 is a bit warm for it. What is the normal running temp for these. She probanbly is ready for a good flushing and possibly a thermostate. Maybe even a full boil out of the radiator. But, she pulled that disc like it wasn't even there and I enjoyed using her.
Thanks for any help,
Normal Temp of the MC
Normal Temp of the MC
Randy Baker
Winters, CA
John Deere MC
Cat D2
Power Wagons
Winters, CA
John Deere MC
Cat D2
Power Wagons
MC is thermosiphon, no thermostat. Early MC had the temp probe in the water outlet, and never read the correct temp. Later ones were in the back of the block, and were much better. An MC is going to run hot no matter what, just the way a thermosiphon system seems to work.
If you pull the radiator, have it cleaned reall well, or replace it with a new one. At the same time, put the fan shroud off of a 40, that will help a lot.
Lavoy
If you pull the radiator, have it cleaned reall well, or replace it with a new one. At the same time, put the fan shroud off of a 40, that will help a lot.
Lavoy
fan shroud
I have a 40C with what looks to be MC radiator and the fan shroud does not have anything to mount to. What can I do?
John Deere 40C SN: 60180
Have a Great Day,
DJ Edman
Have a Great Day,
DJ Edman
-
Stan Disbrow
- 350 crawler
- Posts: 2898
- Joined: Fri Jul 15, 2005 3:13 pm
- Location: Raleigh, NC
Hi,
Basically, ignore the temp gauge and wait for the coolant to squirt out of the vent hole in the radiator cap. That tells you when it's too hot and time to take a break.
Nothing like a simple thermosiphon system. No water pump. No thermostat. No pressurization.
Just can't work 'em as hard, though. But, then, they do a better job of telling you when it's time to slow down and have a cold one yourself!
Stan
Basically, ignore the temp gauge and wait for the coolant to squirt out of the vent hole in the radiator cap. That tells you when it's too hot and time to take a break.
Nothing like a simple thermosiphon system. No water pump. No thermostat. No pressurization.
Just can't work 'em as hard, though. But, then, they do a better job of telling you when it's time to slow down and have a cold one yourself!
Stan
There's No Such Thing As A Cheap Crawler!
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
-
Stan Disbrow
- 350 crawler
- Posts: 2898
- Joined: Fri Jul 15, 2005 3:13 pm
- Location: Raleigh, NC
Hi,
All the early engines were thermosiphon. I think the Deere 40 was about the last of them, though.
They work by the principal that hot water rises and cold water sinks.
As the engine runs, it heats the water in the block and head, which passes thru the upper radiator hose and into the radiator tank.
As the fan pulls air thru the radiator tubes, it cools the water, which sinks to the bottom tank. This, in turn, pulls the warmer water downward into the tubes.
The cooler water enters the engine block thru the lower radiator hose, where it gets pulled upwards by the warmer water leaving the head.
So, you see, there's a natural flow of water thru the engine, removing heat and sending it to the radiator where it gets cooled again. It's a simple and effective system.
Effective, that is, as long as everything is working well. If there's a restriction to the water flow, or to the air flow, then things heat up quickly. Also, if the machine is overloaded, things will heat up quickly as well. That's why I said that the real indicator is water coming out of the vent hole in the radiator cap, as that means there are steam bubbles forming inside the engine - and it's time to stop and cool off a bit.
As time went on, engines became more and more powerful and the old trusty thermosiphon system could no longer handle the heat. So, they added a pump to move the water thru faster than it could naturally. They then had to add a way to slow the water back down when necessary, so that's the thermostat. Later on, they pressurized the system to push the termperature where boiling occurred higher. Finally, they changed the coolant from water to something that had a higher boiling point.
If you look at the M and the 420, they have essentially the same engine (yes, I know the 420 has a bit more displacement), yet the M has 18 MH and the 420 has 32. With that extra HP in the 420 came extra heat - and a water pump to handle it.
So, that's the story.
Stan
All the early engines were thermosiphon. I think the Deere 40 was about the last of them, though.
They work by the principal that hot water rises and cold water sinks.
As the engine runs, it heats the water in the block and head, which passes thru the upper radiator hose and into the radiator tank.
As the fan pulls air thru the radiator tubes, it cools the water, which sinks to the bottom tank. This, in turn, pulls the warmer water downward into the tubes.
The cooler water enters the engine block thru the lower radiator hose, where it gets pulled upwards by the warmer water leaving the head.
So, you see, there's a natural flow of water thru the engine, removing heat and sending it to the radiator where it gets cooled again. It's a simple and effective system.
Effective, that is, as long as everything is working well. If there's a restriction to the water flow, or to the air flow, then things heat up quickly. Also, if the machine is overloaded, things will heat up quickly as well. That's why I said that the real indicator is water coming out of the vent hole in the radiator cap, as that means there are steam bubbles forming inside the engine - and it's time to stop and cool off a bit.
As time went on, engines became more and more powerful and the old trusty thermosiphon system could no longer handle the heat. So, they added a pump to move the water thru faster than it could naturally. They then had to add a way to slow the water back down when necessary, so that's the thermostat. Later on, they pressurized the system to push the termperature where boiling occurred higher. Finally, they changed the coolant from water to something that had a higher boiling point.
If you look at the M and the 420, they have essentially the same engine (yes, I know the 420 has a bit more displacement), yet the M has 18 MH and the 420 has 32. With that extra HP in the 420 came extra heat - and a water pump to handle it.
So, that's the story.
Stan
There's No Such Thing As A Cheap Crawler!
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
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