1610D Loosing Coolant

[wscott]

My yanmar is loosing coolant through the overflow bottle. The coolant bottle stays full because the coolant does not drain back into the radiator after the tractor has cool off.
Could this be the radiator cap or problem the radiator or engine.

 

[YanmarFever]

I would replace the radiator cap first & see what happens,
its a cheap fix compared to a dismantle of your cooling system.
Ern.

 

[gbirky]

Someone may have replaced the cap with an incorrect one. You need one specifically for a recovery system - most of the Yanmars are 13psi.

 

[BigAl]

Radiator cap for sure ! Look at the old one and see if the rubber seal is torn or split . I bet it is . Just get a new cap "13psi" that is for a "recovery type system" .
Big Al

 

[BigAl]

I forgot ! Make sure your recovery hose does not have a hole in it as this will also stop it from working .
Big Al

 

[wscott]

Thanks,

I will be getting a new radiator cap order tomorrow. The rubber on the old cap is in good condition.

 

[BigAl]

If it is a recovery type cap , it will have two rubber seals on it . One outer and one inter .
BigAl

 

[jbitting]

This may sound silly, and you've probably already looked there, but... make sure the cap for your recovery bottle also has the hose INSIDE of it (mine didn't when I bought it)... so it would flow into the bottle, but upon cooling would suck air back into the radiator... /forums/images/graemlins/blush.gif
..and make sure it too, is not cracked or sucking air toward the top.

of course, if it fills from the bottom... well...
just forget I mentioned it. /forums/images/graemlins/wink.gif

 

[kayssupply]

I had one that someone had put a hose on the inside that was too big. They had wrapped a wire around it to hold it on, but it was loose enough to suck air, not water.

 

[wscott]

I got a new radiator cap installed, but this did not solve my problem. My dealer thinks it my be a cracked head. The coolant will complete fill my overflow bottle when i have ran the tractor for about 3 to for hours and overflow the bottle.
There are small bubbles in the overflow bottle (foamy at the top). Would a cracked head or blown head gasket cause this problem or a stopped up radiator. When i remove the radiator cap after the tractor has cooled down, there is still pressure built up in the radiator.

 

[bruce1966us]

Your radiator is stopped up. Have it flushed by a good shop and you should be ready to go!

Thanks,
Bruce

 

[DavesTractor]

It may be a head gasket, but if so, it isn't a big problem. It is an easy job to pull the head and replace the gasket. Of course check for cracks, but the 3-cylinder Yanmars do not seem as prone to cracking as some of the older 2-cylinder models.

 

[kayssupply]

I had a YM1610 that did the same thing. It was a blown head gasket. That is much cheaper than a cracked head.

 

[normde2001]

"When i remove the radiator cap after the tractor has cooled down, there is still pressure built up in the radiator."

I could be wrong, but I don't believe that is possible. That has to be vacuum caused by drawing neither water nor air back into the radiator as the coolant cools to normal temterature and contracts. Is it emptying the radiator or only dropping 1"-2"?

 

[wscott]

It could be vaccum, but if it was vaccum, would it not draw water back in. If I don't refill the radiator, it will almost empty the radiator. The overflow bottle will fill and overflow. The coolant comes out the overflow tube foamy like. I guess I will be taking it back from the dealer I bought it from this weekend, since it is under warranty, but it is a 4 hour trip one way.

 

[DavesTractor]

Those are classic head gasket symptoms. It will take longer to drive to your dealer then to fix it, yet it is probably the best thing to do in case it is more serious than just a gasket.

 

[wscott]

Just an update, I solve my problem. I got a replacement radiator from my dealer, and that has solve my problem. I guess the other radiator was partially stop up. My Dealer has been great. If your are in North Alabama, be sure check out Fredricks Equipment. /forums/images/graemlins/laugh.gif

 

[bruce1966us]

Glad you got the problem solved.

Bruce