Chrysler Repair: oil leak after internal detonation (pop): 2.5 V-6, silicone gasket, motorcycle mechanic

Question
Hi!  I just had a no-spark on a 99 cirrus 2.5v6.  Sorted that out, was a cam pos. sensor, an previous answer from you made it easy to track down, thanks.  It fired right up, but after a few seconds let out a loud but muffled POP, kept running.  I shut it down, checked underhood, all ok.  But it was leaking oil rapidly now, down back of oilpan.  I'm thinking all of the no-spark cranking loaded the motor up with fuel, and it either flashed in the crankcase or the plenum, pressurizing the crankcase and pushing out a seal or a gasket.  No vaccum lines were blown off, runs smooth.  It leaked running or not.  overnight it leaked out about a quart, down to the first add notch on the dipstick, then stopped.  Haven't fired it up again yet to see if it contiues to leak running.  I'm a career motorcycle mechanic but have no car lift.

Any idea what seal or gasket was most likely damaged?  I'm thinking oilpan or crank mainseal, but the oil mainly dripped (poured!) down the back of the oilpan.

Thanks!!

Answer
Hi Marc,
Your theory of a detonation in the oil pan is possible. I would suspect either the oil filter, which is on the back side, is blown or leaking or the oil pan seal to engine block is blown. The latter is simply a 4 mm bead of silcone rubber so it wouldn't take too much to blow that out. It will be necessary to remove the pan to replace it:
Drain oil.
remove cross-under exhaust pipe,
remove drive belt splash shield,
remove dipstick tube,
remove starter motor,
remove struts/bending braces between engine and tranaxle,
remove transaxle inspection cover.
Then remove pan and clean interface surfaces.
Apply 4 mm bead of silicone gasket material, looping around screw holes to the inside of each hole.
Then position pan and tighten screws to 50 inch-pounds,
Reverse procedure for the balance.
You will want to raise the vehicle by jack and put on jack stands.
But first try to clean away all the oil and run the engine with a full load of oil to observe exactly where the leak is coming from rather than doing unnecessary work.
Roland