Cutting O-rings into the block instead of the head?

[PToombs]

Typical parts swapper!

Detroits used to be like that, white quad rings around the water jackets, black for the oil, a steel ring around the cylinder and a reallllllll long black one for around the outside of the block to keep spillage in. (like that really worked!)

[RCCUMMINS89]

Sounds like they had a know it all engineer......

[ellis93]

Like I'm gonna analyze the freakin compounds making up the fire rings,I went to 3yrs of uti not MIT

That's the only motor I remember having dedicated ring tho. I've torn down 4 or 5 of those for in frames and all of them had it. I've been in some big cam cummins engines and from my knowledge they were the same old gasket we use.

[ellis93]

Sounds like they had a know it all engineer......

Just one that didn't know how to keep the oil inside
Then again how do you keep an engine from leaking if you force feed the crankcase with a blower

[PToombs]

Eric, IDK, it was real simple and they made millions (seems like ) of the darn things. Definitely made millions of dollars from them!

Ellis, UTI? Penicillin usually clears that up.

[ellis93]

Eric, IDK, it was real simple and they made millions (seems like ) of the darn things. Definitely made millions of dollars from them!

Ellis, UTI? Penicillin usually clears that up.

Works great
Old joke.....just like the school

[diesel freak01]

Here's a new one for you to mull over. The new thing in the tractor world is c rings. Supposedly they are reusable and seal better at high boost numbers. They are pricey though, $700 for a set and that doesn't include machine work. The I rings we use are about $60 a set. Seal tec makes them for about $4 a piece. I think with the correct clamping force the fire rings work great. Just make sure the machine shop does the work correctly or you will be pulling the head to change gaskets a lot!

[RCCUMMINS89]

O rings are also re usable... what exactly is a c ring?

[fatty]

O rings are also re usable... what exactly is a c ring?

Depends who you ask. I asked ED and some other big shop if I could reuse my orings when I pulled my head a while back. They both said no, the head needed new rings. I just put it back on though and had no problems since.

[RCCUMMINS89]

If one doesn't have to resurface the head.... I don't see why they wouldn't be.

The problem is the fact that you can't run a 6bt head for more than about a re torque without the damn thing being warped.

If you have to re surface it... obviously get new rings.

[Begle1]

So I'm finally getting around to dropping my new block off at the machine shop... What diameter/ thickness/ depth of O-ring should I ask for if I'm getting .020-over pistons?

[diesel freak01]

Diameter I can't help with. We use a .105 fire ring. The size of the ring depends on how deep the cut is. Biggest thing you to come up with is how much crush the gasket will have. With a 105 ring you want it to crush down to .085 roughly. So take the crush of the gasket and subtract the crush of your ring and that's how deep the groove needs to be. If that made any sense at all.

[Begle1]

How much crush does a normal Cummins head gasket have?

How much crush does a size-thicker Cummins head gasket have?

Where can somebody actually buy the actual rings?

[RCCUMMINS89]

6 to 8 thou of protrusion is what I've always been used to (that's what she said).


Begle.......Are you having a shop do this that is saying " I can cut them, but I don't know what to do "

[Begle1]

I trust this machine shop and am probably just going to go with their intuition anyways, they're not Cummins guys though so I want to make sure we don't do something stupid.