Street Smart -

Blown Away by High Pressure

Remember the Dodge truck we talked about in the January 2015 issue? The 2003 Dodge Ram 3500 5.9 diesel? This is what happened to the front clutch (figure 1).  The truck came in with the front clutch blown apart; the shop replaced the drum, only to blow the new drum apart while it was still on the lift.  After replacing the valve body with a new, stock valve body, the pressure dropped down to where it belonged. I inspected the old valve body and found it was severely worn out, with pieces missing.  Now we’re looking at a 2005 Dodge Ram 2500 5.9 diesel with high line pressure; 110 PSI (760 kPa) at idle and 160-180 PSI (1100-1240 kPa) at stall. The pressure should only be
50-60 PSI (335-415 kPa) at idle, and stall should be no more than 95-100 PSI (655-690 kPa).  So I sent a call tag to have the shop send the valve body to me for inspection.