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Old 10-21-2019, 12:42 PM   #1 (permalink)
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In chasis 5.9 Cummins re-ring?

So the 2004.5 HO is showing some age, a bit more blow by than I like.
Has anyone done an in frame ,down and dirty re-ring on these? rest of the rig is in great shape, I work alone and don't want to pull the whole mess.
Thoughts ?
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Old 10-21-2019, 01:02 PM   #2 (permalink)
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Can you get #5 and 6 piston and rod out from under the cab with the block in the chassis?
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Old 10-21-2019, 02:57 PM   #3 (permalink)
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Everything I have read says no...

With how expensive parts are for this engine... I do not think I would want to half do it.
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Old 10-21-2019, 03:06 PM   #4 (permalink)
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I just recently split an injector on my 04.5 and roasted #6 cylinder rings. I talked to 3 different shops and none of them would even entertain the idea of a re-ring. I ended up spending $9000 on a full out of frame rebuild bored .020 over with new injectors, arp head studs an Edge CTS2 monitor and a new south bend clutch (that was close to needing replaced, so I had them do it.) Imho it was well worth the cost instead of paying the ridiculous prices for a new truck.

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Old 10-21-2019, 07:29 PM   #5 (permalink)
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Itís a 5.9. Pull it and do it right IMO. Itís so straight forward. I spent 10k on my 12v. Full rebuild. Balanced rotating assembly. .20 over stock. Head o-ring, and 500 rwhp when all is said and done. I will say my injectors are significantly cheaper, but if youíre staying stock, I would be surprised if you spent more than 5-6k on a rebuild.


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Old 10-21-2019, 07:57 PM   #6 (permalink)
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You have to lift the motor to get the pan out.

Pulling the head in body is a night.are. if its studed forget it.

Pull it out and do it right. Its a lot of heavy work but less of a fight a d strain.
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Old 10-22-2019, 04:27 PM   #7 (permalink)
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Originally Posted by Mopar Moe View Post
So the 2004.5 HO is showing some age, a bit more blow by than I like.
Has anyone done an in frame ,down and dirty re-ring on these? rest of the rig is in great shape, I work alone and don't want to pull the whole mess.
Thoughts ?
Diesel don't typically wear rings out, plus new rings require a hone not a back yard thing on a hand drill, thats caveman.
So even if you could rering you have not addressed what the problem is .

One needs to measure the cylinders, ring lands, or just start guessing and hoping.
Not worth it.
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Old 10-22-2019, 08:27 PM   #8 (permalink)
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Diesel don't typically wear rings out
That is incorrect. In fact, that is one of the main reasons to tear down and rebuild heavy diesels. Compression drops until power is significantly reduced or they won't start. There is a spec for blow by to prevent reaching a no start before rebuilding. Valves, too, wear, but the rings are a big part.
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Old 10-23-2019, 05:25 AM   #9 (permalink)
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[QUOTE=scenicruiser549;44654706]Diesel don't typically wear rings out, plus new rings require a hone not a back yard thing on a hand drill, thats caveman.
So even if you could rering you have not addressed what the problem is .

One needs to measure the cylinders, ring lands, or just start guessing and hoping.
Not worth it.[/QUOTE


I know the process , 33 year career as a machinist, my question was if anyone had done it. We re ring the big stuff all the time.

Ive built everything from 1200rpm generators to 9800 rpm sports car engines, The rest of this engine is sweet , my concern was the clearance issues in extracting the pistons then getting a Sunnen CK hone set in
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Old 10-23-2019, 07:45 PM   #10 (permalink)
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I’d just pull the motor, anytime something like that needs attention, I put the few extra hours to re-gasket. Hell of a lot easier on a stand.
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Old 10-28-2019, 08:04 PM   #11 (permalink)
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Diesel don't typically wear rings out, plus new rings require a hone not a back yard thing on a hand drill, thats caveman.
So even if you could rering you have not addressed what the problem is .

One needs to measure the cylinders, ring lands, or just start guessing and hoping.
Not worth it.
STFU noob. You have no idea wtf you are talking about.

OP, just pull the engine out. Its a PITA ass to get the oil pan off the engine with it in the truck. Even then, I don't think #5 and #6 piston and rod will come out between the block and the cowl...and thats after you remove a 200# cylinder head.

Just pull the engine and do it right. #6 for sure, and #1 probably needs bored and honed anyway.
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Old 10-28-2019, 09:16 PM   #12 (permalink)
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How hard is it to lift the cab on a Dodge?
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Old 10-28-2019, 10:15 PM   #13 (permalink)
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If you dont have a lift? Pretty fuckin hard.
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Old 10-29-2019, 08:15 AM   #14 (permalink)
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How hard is it to lift the cab on a Dodge?
Oh Jesus....Dont start this shit again!
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