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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,267
You need to remove the upper and lower rocker covers and see if all the headstuds are intact. If the car is on level ground or on a lift you'll need to drain the oil first. You can jack up one side at a time and remove the lower rocker cover on that side so a bunch of oil doesn't pour out. The upper covers can come off anytime.

The right side heat exchanger has taken a shot and that force was put through the headstuds when that happened if those headers were on the car at the time. The origonal dilivar headstuds are known to break and that could have broken one or more. They may have been replaced with new or better ones like ARP or others when it was rebuilt and may be fine though and I don't think you have combustion leakage, just combustion blackened oil is seeping out helped by combustion pressure.
If there is conbustion leakage you'll probably hear it even with no muffler. There is no head gasket in a '88 930 motor unless fire rings were added when it was rebuilt.

Anyway, if all the headstuds are good and compression improves from driving it retorque the headstuds, adjust the valves and refill with clean 20w-50 oil. Then spray engine cleaner on the bottom of the motor, hose the oil gook off, drive it and look for fresh oil leaks.

If you find a broken headstud the heads and cylinders have to come off to replace it. Then it gets expensive.
If going there you'll be replacing the large and small chain box orings and gaskets so that oil leak will be fixed then. Any possible rocker shaft oil leaks can be addressed then too.
Old 12-10-2011, 06:28 AM
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