O-Rings, Pictures, Myths, Facts and Info!
#12
most places say studs over 45 psi, and fire ring/ o ring at boosts over 60-65. if i remember how they classify it, fire rings are cut in the head, o rings are cut in the block. and on fire rings the head gasket is modified and the original ring is removed from it and a mild steel ring that fits the groove in the head replaces it. if you are going for really high boost levels over 125 i would say you should have both the head and block cut. this way in theory if the head does lift any the ring cant shift or blow out of place. i read an article recently that the owner of BD diesel wrote stating that just to prove his point he built a cummins that produced so really high boost numbers on a stock gasket and stock head bolts. now how long it would last is a good question, but he did do it and stated the truck had roughly 10,000 miles on it on that setup. you would be fine with a stock cummins gasket and studs. i only fire ringed mine for longevity. i ran 65-75psi before i fire ringed it. on studs and a stock gasket and never blew one.
#14
#15
#17
BaditsDiesel is incorrect...
O-RINGS are cut into the HEAD only. It STILL uses a stock head gasket. The O-ring crushes down REALLY hard on the STOCK head gaskets compression/fire ring (the metal o-ring built into all head gaskets.
FIRE-RINGS do NOT use the stock head gaskets compression/fire ring. It is REMOVED and there is a ring pressed into the head that fits in a groove cut into the block. THIS ring becomes the holder of ULTIMATE pressure because it fits in both grooves.
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ASMXB24 - You should at LEAST stud your head!! I wouldnt o-ring it unless you blow the stock gasket. But you should be ok! I only did it because my head ALREADY blew its gasket AND I am going to get twins and want to be SAFE!
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AROBERTSON - No the stock head does NOT have a groove cut in it. Part of the BIG $$ of having o-rings done is the perfect groove they cut in the head. Its cut into the head in a perfect circle they then press in a wire that fits TIGHT in that groove. That smashes the stock head gaskets fire/compression ring as stated above.
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TurboStang - You should not have to re-torque once the initial re-torque sequence is done... A few times perhaps... You do this to make sure the stock gaskets fire ring is crushed properly and seated TIGHT
O-RINGS are cut into the HEAD only. It STILL uses a stock head gasket. The O-ring crushes down REALLY hard on the STOCK head gaskets compression/fire ring (the metal o-ring built into all head gaskets.
FIRE-RINGS do NOT use the stock head gaskets compression/fire ring. It is REMOVED and there is a ring pressed into the head that fits in a groove cut into the block. THIS ring becomes the holder of ULTIMATE pressure because it fits in both grooves.
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ASMXB24 - You should at LEAST stud your head!! I wouldnt o-ring it unless you blow the stock gasket. But you should be ok! I only did it because my head ALREADY blew its gasket AND I am going to get twins and want to be SAFE!
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AROBERTSON - No the stock head does NOT have a groove cut in it. Part of the BIG $$ of having o-rings done is the perfect groove they cut in the head. Its cut into the head in a perfect circle they then press in a wire that fits TIGHT in that groove. That smashes the stock head gaskets fire/compression ring as stated above.
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TurboStang - You should not have to re-torque once the initial re-torque sequence is done... A few times perhaps... You do this to make sure the stock gaskets fire ring is crushed properly and seated TIGHT
#18
im not so sure i agree with your deffinitions. everyone i deal with II, scheid, haisleys, all call O-ringing a groove in the block. fire ringing is in the head. but fire ringing can be done in both head and block for a better hold. cause my head is fire ringed and its only cut in the head. and uses the modifiyed gasket.
#19
Here is pure diesel powers description, the engine shop that did mine shares the same terminology... Maybe its just a PER SHOP description...
Fire Ring versus O Ring Cylinder Head Dodge Cummins Diesel
I dont really know, i would love to know the official description
Fire Ring versus O Ring Cylinder Head Dodge Cummins Diesel
I dont really know, i would love to know the official description
#20
so to o-ring you have to pull the block out and take it to the shop? i don't want to go to that length . i will more than likely be pulling my head this summer to do some port work on it so i figured while it was off i would go ahead and do this stuff to it. and im not too familiar with it yet . so if i am gathering the info right the firering is in the head or head block combo, and o-ring is in the block only? i read on another forum that firerings have to be torqued down much more often than o-ring? to firering you have to get a modified gasket but o-ring has just a metel wire that goes into the groove and uses the stock head gasket?sorry not trying to steal the thread just want some info