OK its time for the great fluid change......

[RICHARDG]

O.K.,,its an air bubble thing,,not a metal issue,,,starting to make a LITTLE more sense,,,,still don't get why they would be less/more air bubbles in a motors cooling system,,the wet sleeeve must be it,,don't know enough about wet sleeve verses nonwet sleeves to make a comment on that,,,not even close to being a mechanic,,,still having trouble understanding why an additive would make air leave a void,,I have less of a hard time understanding the fact that air could be trapped in a void,,but that air would be cooled also by the liquid around the air pocket,wouldn't it?,,and you would think over time,that air would become so saterated with coolant,,from being sloshed around,and what not,that it would work its way out,,must be air coming in somehow,,,not trying to give a hard time here,,just trying to understand this,,,I mean water would work perfect for cooling,,except it freezes,,some additives could hurt aluminium,understand that,,but this air pocket thing,,sounds like piss poor engineering,and these china motors are low tech,,been around for many,many years,,not the newest high tech ford truck diesel,,how many years has this coolent been out,,,forever?,,or did the need for it just develope with newer diesals???Thats kinda my point here. thingy

 

[SevenCorners]

When I stop my tractor there is always a small amount of noise from the radiator sounds like some bubbles, not a boiling sound. I did not use anti-cavitation stuff might be interesting to see if sound diminishes with anti-cav.

 

[GRUMPA]

7 When I was younger and working on cars alot what you described sounds like what we called AIRBOUND. Meaning that if air can get in small air bubbles will float aound in your cooling system and acumulate around the water pump and thus basically block the flow of water. Just for good measure you might want to just see if any of the water hosees are even the slightest bit loose.

 

[JohnS]

Richard,

I don't quite understand it either, but it is cheap peace of mind to use the Fleet anti-freeze.

Dictionary:
cav·i·ta·tion

1) The sudden formation and collapse of low-pressure bubbles in liquids by means of mechanical forces, such as those resulting from rotation of a marine propeller.
2) The pitting of a solid surface.


Now diesels have much higher compression ratios than gas engines, but still don't understand how that effects the back wall of the cylinder.

 

[Harrygoodwrench]

From experience I believe all big diesel engine manufactureres require a "Diesel Coolant Additive" to their cooling systems.Some are Cat, International, Cummins, Mack, Ford and so on. It may be already added into the coolant such as CAT uses. I know Ford has there own specific called DCA.
What happens with liner cavitatation is the coolant is being circulated at a fairly high rate. This movement causes turbulance which causes small air bubbles much like tap water coming out your kitchen sink. If you pour a glass of water you will see the small bubbles stay for awhile. Well, when these small bubbles pass around the cylinder liners the firing impulses of the cylinders cause the bubbles to "implode"(no its not mis-spelled).
This causes a displacement of a few metal molecules every implosion. Eventually the cavitation eats right thru liner and coolant enters the cylinder.
The additive "modifies" the adhesion properties of the coolant to help prevent the bubbles, as well as other purposes(anti-rust, etc). Some manufactureres even use coolant spin on filters that have the additive wafer built inside and also to filter.
Whichever way you go it certainly can't hurt to add some. I do.
Hope I did not bore anyone.

 

[Bird]

Bore anyone? Not at all. That's the best explanation in this thread.

 

[greg_g]

</font><font color="blue" class="small">( An Anti Cavitation additive is recommended by all Deisel Engine manufacturers. If you got a diesel in one of the big 3 pickups )</font>
I get it; adds anti-cavitation properties to coolant, similar to anti-foaming additives to gear oil. But I don't think "the big three pickups" constitutes "all diesel engine manufacturers".

In addition to the Kubota manual not specifying, my Yanmar/Jinma/KAMA manuals make no mention either. Keep in mind that (a) these are Asian engines, and (b) they're not BIG diesels. I have a 3 liter Mercedes turbo diesel with a quarter million miles on it. Nothing specific recommended by MB, so it's not had anything in it but the green stuff for 20 years.

This is not to say that coolant additives are a BAD thing. Just that maybe it's leaning toward overkill on small Asian diesels.

//greg//

 

[RICHARDG]

Harry,you are getting to be the smartest man I never met,,,,will look for disiel rated antifreeze when I go buy oil and filter this or next week,,,or maybe just the additive,,that would be easier and cheaper.if they sell it?. Still,now that I know what this all means,,wondering if it really is a factor in these small chinese engines,,,and am wondering how long this stuff has been available[or even known about],,,I can tell you this much,,ain't been a concern in over 300 hrs,,,,,,wonder if ole jules uses this stuff,,,,,,,na,,,,,,,bird,,glad to see your over here learning about these chinese tractors and cavitation,,tell sound person,hello,,,thingy

 

[Harrygoodwrench]

When I said the big engine manufactures I meant the BIG engines like in trucks, heavy equipment etc. Ford recommends/requires it in theirs too. Do these small engines require it????????probobly not in my opine. Do I use it? yes I do but its just an added precaution. I get a 16 ounce bottle and it will last me for life of my tractor. About 9 bucks a bottle. Just my choice and not an endorcement of a product.

God Bless our Troops

 

[SPIKER]

I too put standard antireeze in mine and the small bypass hose didn't like it at all! it lasted about 100 hrs before a big jolt blew the bypass hose the main rad hoses have shown no signs of the dry-rotting type cracking that the bypass hose showed. anyhow after the bypass hose blew I changed to the ford spec truck anti-freeze GL8 I think? it is not the pee green but a pee yellow stuff: I know that the wet sleeve is steel liner not cast iron like a normal block for say a car. this is part of the differeance I belive. I know I was told 300K from a FORD diesel with proper additive/anti-freeze and only 100~170 if using the standard anti freeze! this from a fleet tow truck company owner... he is a good friend and been in the buisness for 20+ yrs. he has had many types and will only buy the fords now as he has the repairs and maintenance down pat...


anyhow just my 2 cents worth.

MarkM /forums/images/graemlins/shocked.gif