Welder Dave
Senior Member
On some equipment the rad shrouds and air flow is very important. On Lincoln welders the the cooling system is designed to work the best with the side doors closed.
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Kubota v1505 overheating
- Thread starter MrFritsch
- Start date
Update. Yesterday I had a feeling the head gasket wasn’t sealing correctly due to the blow by and overheating. So I pulled the head, it all looked good, slight scoring on the cylinder liners but nothing I could feel which I figure is the blow by. Not sure how that happened with new piston, rings and liners. The head gasket looked great. I used a different one and put 5 coats of copper coat on both sides per one of the mechanics in the area. No change when back together but made me feel better. Today I pulled the water pump. It was the correct impeller size and correct direction according to the push not scoop orientation I read. Put it back together and no change. I ordered a coolant pressure gun that uses a garden hose and compressed air to clean the coolant system. Maybe the guy before me dumped a few bottles of head gasket fix and it’s just full of sludge that the garden hose can’t flush out by itself. But I’m pulling at straws. I had a few tractors that I overhauled where the block was half full of sludge and overheated.
Nige
Senior Member
No coolant circulation.? Should be close to 20 Deg difference between upper and lower hoses.
Nige
Senior Member
That’s not what the temperatures are saying.
The top and bottom were 200F, randoms spots on the rad tubes were either 100 or 140. This is with the original rad and fan. Thermostat out and coolant flowing. There’s a small hose that comes off the water pump and connects to the thermostat house, no other by pass. I picked up an electric rad fan and was going to install that and the new rad tonight when the kids go to bed and re test. I did a chemical flush a few days ago and everything came out clean before, during and after.
92U 3406
Senior Member
Stupid question but have you verified the fan is installed the correct way? If it's on backwards they tend to not move air through the rad very well.
Yup fan was on the right way, one of the first things I checked. Put the new radiator and electric fan on. It heated to about 200 in less then ten minutes. I checked the temp at the thermostat housing with the temp gun and it read 210, 200 top of rad, 160 bottom of rad and 210 at inlet of the water pump coming from the lower radiator hose. I spent a while with the temp gun and the temp of the rad slowly rose to about 200 throughout the whole thing. I was thinking maybe the water was flowing to fast so I’m going to grab another thermostat tomorrow, as the other one I gutted as part of the diagnoses earlier.
The blow by is still concerning to me from the fresh rebuild. I’m not sure if the extreme amount will cause the overheating. It has decent pressure, smoke and drips oil out of the valve cover breather-after it warms up.
92U 3406
Senior Member
All the shrouds are in place, all the foam sealing strips between the coolers and around the sides are in place? The larger Hitachi excavators were known to overheat if the shrouds, guards and the gaps between the coolers were not all sealed up properly.
92U 3406
Senior Member
Is this electric fan on there factory or was it a modification done to the machine? I can't say I've ever seen a mini ex with electric cooling fans before. Engine driven fans tend to move a lot more air than an automotive style electric fan.
HarleyHappy
Senior Member
Okay so you have blow by. How was this rebuilt engine broken in and what oil did you use and what was the condition of the head? Did you use plastic or metal?
What was there when it was tore down, plastic or metal?
What was there when it was tore down, plastic or metal?
The engine was broke in with 15-40 oil and let at a high idle for 45 minutes. The head was pressure tested and valve guides replaced at the machine shop. I ended up buying a replacement head because it was still overheating and still have the same issues. What are you asking was plastic or metal? The head gasket was the 2 piece metal