I guess I will start at the beginning. I was useing my YM1700 the other day gradeing my hill, that goes to my driveway. It was 94 degrees, and after a while it started to make a lot more noise. I thought it must be hot, so quit and came back to the house, as I came it quieted down, by the time I got to the house, about 1/5th mile, it sounded OK. I found out the bulb to the temp. was burnt out. I replaced it and I thought I would change the antifreeze at the same time to get the 30/70 I should have as didn't know what it was. After I flushed it out good and changed it, I ran it for about 10 minutes or so and checked it to see if it was full and all. But I found air bubbles coming out of the overflow tube. Is this normal? It seems to be runing allright and no oil in water or water in oil. So am wondering if I have a problem or not.
Wonder if I have a problem
- Thread starter pruntyc
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fivestring
Veteran Member
I don't know about the air bubbles but I believe most folks use a 50/50 mix.
gbirky
Platinum Member
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- Yanmar models: YM1110D, YM1301D
Fivestring,
That is one of the things you have to watch for with the older tractors that don't have water pumps. The YM1700 is one without a water pump. If you use a 50/50 mixture of antifreeze, the coolant won't circulate and you will overheat the engine. In order for the natural "thermosyphon effect" circulation to work, the antifreeze must be 30% or less.
That is one of the things you have to watch for with the older tractors that don't have water pumps. The YM1700 is one without a water pump. If you use a 50/50 mixture of antifreeze, the coolant won't circulate and you will overheat the engine. In order for the natural "thermosyphon effect" circulation to work, the antifreeze must be 30% or less.
gbirky
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Dick,
Are you saying that there was coolant and air coming out the overflow tube with the radiator cap on, and the engine running? That is normal, especially as the engine gets warm the first time after filling the radiator. The thermal expansion of the water (and any air in the system) will cause enough pressure in the system to expell excess coolant. That is why most cars (and tractors) have an overflow reservoir and a cap that allows the recovered coolant to go back into the radiator as the engine cools down.
What you need to watch for is bubbles in the coolant when the tractor is cold and you first start it up with the radiator cap off. Just look inside the radiator with the cap off for a few minutes when you start it up. Bubbles could mean a leaking head gasket, or a cracked head.
Are you saying that there was coolant and air coming out the overflow tube with the radiator cap on, and the engine running? That is normal, especially as the engine gets warm the first time after filling the radiator. The thermal expansion of the water (and any air in the system) will cause enough pressure in the system to expell excess coolant. That is why most cars (and tractors) have an overflow reservoir and a cap that allows the recovered coolant to go back into the radiator as the engine cools down.
What you need to watch for is bubbles in the coolant when the tractor is cold and you first start it up with the radiator cap off. Just look inside the radiator with the cap off for a few minutes when you start it up. Bubbles could mean a leaking head gasket, or a cracked head.
allenp
Silver Member
I also have a YM1700 and can offer this advice. The engine temperature will run a few degrees cooler with a 30/70 mixture than with a 50/50 mixture. An even better “summer time” mixture would be 100% pure distilled water with a rust inhibitor.
As far as bubbles in the overflow, you need to take it one step further. Let it cool down COMPLETELY, like tomorrow morning, take the radiator cap off and start it up. Look closely in the top of the radiator to see if there are any bubbles. If you see bubbles, you may have a blown head gasket, cracked head, or possibly the head is not torqued to proper specs (130 lbs).
If you want to know exactly what is going on with the temperature, I would install an aftermarket temperature gauge. You will need, however, a 16mmx1.5mm adapter for the temperature probe. These are available at some auto parts stores or directly from www.sunpro.com (and probably a few other places).
Hope this helps.
Allen
As far as bubbles in the overflow, you need to take it one step further. Let it cool down COMPLETELY, like tomorrow morning, take the radiator cap off and start it up. Look closely in the top of the radiator to see if there are any bubbles. If you see bubbles, you may have a blown head gasket, cracked head, or possibly the head is not torqued to proper specs (130 lbs).
If you want to know exactly what is going on with the temperature, I would install an aftermarket temperature gauge. You will need, however, a 16mmx1.5mm adapter for the temperature probe. These are available at some auto parts stores or directly from www.sunpro.com (and probably a few other places).
Hope this helps.
Allen
Soundguy
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I know that sunpro now sells some metric adapters alongside their kits. When i got an aftermarked oil gauge, right next to it for another few bucks was an assortment of sae to metric adapters. ( and also some copper line... which I bought instead of that plastic tubing. )
Soundguy
Soundguy
fivestring
Veteran Member
Well...... Mine is 87 model 3cyl. Iseki. I guess I better look to see if I have a water pump. I've had it 4 months now. Dealer (Corriher in Newton, NC) told me to use a 50/50 mix. Glad I haven't had to add any yet!!! Thanks.
normde2001
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"after a while it started to make a lot more noise."
This, coupled with bubbles, could be a leaky head gasket, at least when hot. Check for any kind of fluid seepage between cylinder and head.
This, coupled with bubbles, could be a leaky head gasket, at least when hot. Check for any kind of fluid seepage between cylinder and head.
kayssupply
Platinum Member
The YM1601 I had that had a bad head gasket would " make " water in the overflow bottle. It wouldn't start getting hot until it had over flowed the bottle enough to make it low on water. Then it would get hot fast. Also there was a red rust colored film anywhere the radiator water had touched.
Well, you guys were right. When I filled it up yesterday, with the mixure, I put some in the overflow bottle also. Well, after it cooled down and I checked it the bottle was almost dry. So I refilled it, to the line and took the cap off and started it and watched it for a few minutes and no bubbles in it. Then I put the cap back on and it had a few bubbles, used it for a little while and checked it again and no bubbles, and overflow stayed full this time /forums/images/graemlins/grin.gif. So I am thinking it probably had a small air lock in it someplace, and it worked out. As it seems to be fine now, thanks a lot guys, one does worry about their little toys, or I mean their work machines.
