I agree with Tom again.

but there are two measurements you would need to take.

-the gap between the ring lands and each individual ring.

-the end gap of each ring when placed in the cylinder perfectly square.


Obviously, you would need to remove the rings from the pistons to do this... are you really going to put them back on once you've measured them

no.

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A comment on ring ridge....if you are not changing the rings you don't need to worry about this. It has to be removed if new rings are installed so that the unworn rings won't bump against the ridge left from the old rings which because of the wear on their sides would not reach as high on the cylinders.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

The new rings will not go any higher than the old rings? Right?

They can. It is usually much more of a concern in higher mileage / wear conditions.

It doesn't sound like you have much to worry about, but it is bad practice to ignore this detail.

Remove all the carbon / dirt in the region and drag a piece of soft metal (a penny?) along the area you think the ridge should exist. Drag lengthwise through the bore.

this should give you a good idea of what you are dealing with.

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The only carbon in the cylinders is at the very top, is this what you are talking about?

Yes.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

The bottom of the new rings will be the same position but the unworn ring will be taller and will bump against the ridge and can break rings. If you can catch a ridge with your fingernail you need to ream it if you put in new rings.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

How do I ream the cylinder, with what do I clean the ring without doing any damage?

Just ran my fingernail up the cylinders and it did catch just alittle, can I do this with a brass wire brush? Also, where is a good place to get the piston rings?

You can probably rent a ridge reamer from Autozone or from a machine shop. A few phone calls will probably do the trick.

I own one but have no idea where it is.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I called dealer about the piston rings, they want $140.00 per cylinder!!! Phill has the whole set for all cylinders for $170.00. I will order then sometime this week.

Well piston rings are on there way, I cant wait to get the 190D back on the road. I drove my wifes 300D the other day and I love the diesels.

I would love to have a nice clean 190d with a five speed. It is a beautiful design.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Got my piston rings and ready to put it all back together. I dont know about my crankshaft, it has some marks on the mains. Im thinking about taking the crankshaft out of the other motor, to see if that one is in better shape. Can I take the crankshaft out without taking the motor out?

I'm sure you could find a way to do it.... but you will be cussing for a week and writing me hate-mail for suggesting it.

even if you drop the trans and take the flywheel off... there is a tab on the timing cover that prevents removal of the crank. - the timing cover will have to come off unless you decide to break that tab.


post pictures the crank main damage. - good ones, many angles