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Engine Builder
By Engine Builder
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Approximately how much can you grind off a crankshaft on a DDC diesel engine?

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The AERA Technical Committee offers the following information regarding crankshaft remanufacturing specifications for 1986-2007 DDC 11.1, 12.7 and 14.0L diesel engines.
The crankshaft for the above mentioned 60 Series engines can be remanufactured during the engine building process. Three undersize crankshaft bearing sets are available for both rod and main bearings.

Crankshaft Grinding

In addition to the standard size main and connecting rod bearings, .254 mm, .508 mm and .762 mm (approximately .010", .020", and .030"), undersize bearings listed in the table below are available. Crankshafts which exhibit surface irregularities may be reground to utilize these bearings.

 
NOTE: Crankshafts with discoloration are not acceptable for rework (For additional information on crankshaft regrinding see AERA Technical Bulletin TB1632).
To help determine which crankshaft you’re working on refer to Chart 2.

I’ve had complaints of coolant leaks in pre-combustion chambers on some Mercedes Benz diesel engines. Any help?

 
The AERA Technical Committee offers the following information regarding a pre-combustion chamber caution for 1986-88 Mercedes Benz 601, 602 and 603 diesel engines. Over time it is common for the pre-combustion chambers on these engines to develop fuel or coolant leak passages.

Mercedes Benz offers tooling, p/n 601 589 00 66 00 to reform the seating area of the head to assist in sealing the pre-combustion chamber. It is absolutely essential to observe the specified pre-chamber projection of 7.6-8.1 mm (Dimension C, Figure 1) as it provides the required clearance between the pre-chamber and the piston crown with the piston at TDC. Therefore, a spacer washer must be inserted on re-worked seating surfaces. These are available from Mercedes Benz in thicknesses of 0.3, 0.6 and 1mm. 

Chart 1 Connecting rod and main bearing sets available for 1986-2007 DDC 11.1, 12.7 and 14.0L diesel engines.Chart 2 Crankshaft identification for 1986-2007 DDC 11.1, 12.7 and 14.0L diesel engines.Figure 1 Pre-combustion chamber washers are available in 0.3 mm, 0.6mm and 1 mm thicknesses on Mercedes Benz 601, 602 and 603 diesel engines.

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