I'm gathering parts to rebuilt a 6.2 or 6.5 for my dually that I tow with. I was wanting to know what is the prefered way on the crankshaft? I have heard to turn it down others have said not to even think about turning it. So which way is right?
CK5
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crank turning
- Thread starter odee1
- Start date
Jarhead is right.
The 6.2/6.5 cranks are made of nodular iron, and they are heat treated to have a fine pearlitic matrix for excellent ductility. The journals are then nitrided for good wear properties. This combination gives a hard enough surface to resist wear, but a ductile enough core to resist the shock loads of 21.3:1 diesel combustion.
The nitride layer is only a few thousands thick, and any grinding will remove this wear resistant layer is short order.
Polishing is okay; grinding is bad. /forums/images/graemlins/smile.gif
The 6.2/6.5 cranks are made of nodular iron, and they are heat treated to have a fine pearlitic matrix for excellent ductility. The journals are then nitrided for good wear properties. This combination gives a hard enough surface to resist wear, but a ductile enough core to resist the shock loads of 21.3:1 diesel combustion.
The nitride layer is only a few thousands thick, and any grinding will remove this wear resistant layer is short order.
Polishing is okay; grinding is bad. /forums/images/graemlins/smile.gif
arveetek
1/2 ton status
[ QUOTE ]
Jarhead is right.
The 6.2/6.5 cranks are made of nodular iron, and they are heat treated to have a fine pearlitic matrix for excellent ductility. The journals are then nitrided for good wear properties. This combination gives a hard enough surface to resist wear, but a ductile enough core to resist the shock loads of 21.3:1 diesel combustion.
The nitride layer is only a few thousands thick, and any grinding will remove this wear resistant layer is short order.
Polishing is okay; grinding is bad. /forums/images/graemlins/smile.gif
[/ QUOTE ]
What he said! /forums/images/graemlins/thumb.gif
Casey
Jarhead is right.
The 6.2/6.5 cranks are made of nodular iron, and they are heat treated to have a fine pearlitic matrix for excellent ductility. The journals are then nitrided for good wear properties. This combination gives a hard enough surface to resist wear, but a ductile enough core to resist the shock loads of 21.3:1 diesel combustion.
The nitride layer is only a few thousands thick, and any grinding will remove this wear resistant layer is short order.
Polishing is okay; grinding is bad. /forums/images/graemlins/smile.gif
[/ QUOTE ]
What he said! /forums/images/graemlins/thumb.gif
Casey
So I guess the answer is not to run one that has been turned. I have seen alot of bearings lately on ebay for a crank that has been turned on mains and rods. I thought it might be a good way to save a few dollars on a rebuild.
