Thread: My Red '97
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Old 01-27-2020, 05:34 PM   #7
78F350
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Join Date: Jul 2014
Location: Oklahoma
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Busy at work, some travel, and waiting for parts; I finally got some more work done on the Red. Clearly it has been leaking oil for a while and that needs to be addressed before putting many more miles on the car. Oil is everywhere. I cleaned the engine and after a drive it was on the top, the bottom, and both sides. Best to start with the simple common stuff before worrying about the RMS or anything difficult. Spark plug tubes and the oil cooler o-rings are my prime suspects and good to do anyway as preventative maintenance on a 180k+ mile car. As I worked through them, they clearly needed it.


The spark plug tube o-rings were clearly leaking and most of the coil boots were in rough shape. I replaced the right side with the parts I had on hand, but had to order a set for the left side - forgot that I had used up most of my stock on another car during the summer. How to remove old spark plug tubes: Spark Plug Tube Removal Tool



After going for a 15 minute drive and checking the top of the engine, it was clear that coolant was leaking on top of the engine as well as oil. Most likely suspect for that is the oil cooler and it can be a cause of intermix of coolant and engine oil as well. So far there has been no intermix, just leaks. I removed the old oil cooler. The large o-rings on the coolant side were shot, but the oil side didn't look that bad. I was glad to find that the oil cooler on this car was the standard one and not the version that was specific to the early '97s. That meant that I could put a new, larger S-Model oil cooler on without an adapter plate.

After putting it back together, torquing the bolts to 7.5 ft/lbs (90 in/lbs), I ran the engine to check for leaks. There was a sound of rushing air, not quite right for the intake. I moved around listening and feeling for leaks. the oil filler tube on top of the engine was hissing. I put my hand on it and it easily rocked back and forth. With the engine off, I found that the rigid part of the tube that bolts to the top of the engine was cracked and not fully inserted into the engine. I have two used ones 'in stock' from scrapped engines. Tomorrow, I'll have that replaced and go for a drive. Hopefully that will take care of the leaks.
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