Re: Special Antifreeze for Diesel?

Posted by Jon H on June 02, 2005 at 20:10:04 from (69.26.17.20):

In Reply to: Re: Special Antifreeze for Diesel? posted by Jerry/MT on June 02, 2005 at 17:34:42:

Thats pretty close to what I read in a little booklet put out by Caterpiller. The normal detonation shock wave at fuel lightoff in the cylinder liner of a diesel engine causes certain areas of the cylinder liner to ring like a bell. The vibration of this area of the liner will cause bubbles to form then collapse with enough force to scour the liner down to bare metal. No problem if the coolant additives have prevented any rust or corrosion from forming on the liner.The problems start when the coolant is allowed to get old with all the additives depleted and the coolant turned somewhat acid (As ethelene glycol antifreeze ages,heat and air slowly converts it to sulferic acid). When the liners begain to get rust on the outside from sour coolant,When these vibrating"hot spots" on the liner ring,the cavatation bubble scours the rust off,down to bare metal. When you shut the engine down for a matter of hours or days with sour coolant,these cavatation scoured spots rust again.When the engine is restarted,cavation again scours the rust off that spot down to bare metal. This cycle repeats itself untill a little worm hole is rusted completly through the liner,and coolant leaks into the cylinder/crankcase. Cavatation damage seems to be worse in engines with tall,unsupported thin sleeves which vibrate worse than short thick liners. The 300 and 400 series IH engines were bad for this,You either kept the coolant sweet or you faced an early engine overhaul. Many newer engine designs have a mid support on the liner to dampen the vibration and lessen liner cavatation.
Diesel engines need the special coolant additive package because they run under constant detonation,while a gas engine does not.

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