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My Jinma 284 has an overheating problem. I do not see a radiator leak. When I open the cap (cool water), it looks as if the water is circulating well. Since all of my instruments and electrical parts have long been shot, I don't see when the water gets hot. The radiator fan works, belt is OK.
A couple of times, while mowing, the engine began loosing power, and down-shifting did not help, and the engine stalled. I then opened the radiator cap VERY, VERY carefully. Even after all the hissing was gone, a fountain of super hot water burst out (I was prepared). Considering the water lost in that geyser, not much water was lost before opening. I would fill up the radiator and start the engine up again (no starting problem). Within 30 min., same thing.
Q: Although the water LOOKS as if it is being circulated, how can I find out whether it is actually working?
Q: Thermostat: where is it, what does it do? Could it be that only the thermostat is bad, and that the pump is running but no cooling water is run through the engine? And that the radiator water heats up that fast?
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If it's like mine the thermostat housing is where the upper radiator hose connects to the engine, and you can check the thermostat with a pot of boiling water. Most likely the radiator fins are plugged with chaff.
You want to be very careful if using compressed air to clean them, you can lay the fins over real easy if you're not careful. Even if your electrical system is not working right you should get a manual gauge and sending unit from a parts store or anywhere that sells gauges, a cheap one will do the job. You don't have to go overboard, but you should have something.
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Wash the radiator out with a hose and blow thru the fins with a air blower, if you cannot see thru the fins that is your problem, we have had so many tractors brought to us with this problem, the customer said they cleaned the radiator, once they seen us clean it they did not know what to say , we had a pile of dirt under the tractor
If you cannot see thru it, wash and blow it out again
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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Aloha Tommy,
That was indeed the problem, I think. Most importantly, there was a big help from Jerry, who told me about when and why the thermostat kicks in . I found the right thermometer, and yes, the pump and thermostat work as they should. Cleaned again and again, and now things seem OK.
On another note, the sputtering and dying engine was UNRELATED, just coincidental and very misleading. I pulled out the little gas filter and it was filthy. All seems well.
On the third (yes, that thing is a lot of trouble, and even after 10 years of hands-on observation , there is still a lot that is pure mystery, until I discover that it's just mechanics. I was mowing yesterday, a neighbor's lot, when I got so close to a hidden (by very high weeds) steep ravine (10' deep) that the whole tractor, rotary mower and all, nearly toppled down. I immediately lowered mower and bucket 100% and very gingerly climbed out (on the right,i.e., “wrong” side) My neighbor insisted that he could get it out, and did, with help of 3 people who stood on the mower and rear wheel (for counter balance) while he inched it away fro disaster. In shifting frantically, he did something, perhaps awful:
The gear stick noodles around without any internal contact. I will, this morning, take of the gear box cover and see what happened. Yes, I am scared.
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