I knew there had to be a clean safe way to delete the oil cooler lines since GM does not use oil coolers on a lot of cars. The fact that they sell the oil filter adapter without the oil line option is nice so the filter is not recessed even more unless they make a longer filter like for some other engines.
This week we just removed two in the process of swapping our out half million mile 1998 4.3 X for another 119K 1998 4.3 W VIN engine. We removed and replaced it on the 119K mile engine (required to remove the oil pan) and put in a new O-ring to be on the safe side when we installed the new pan gasket.
Since this S10 was purchased as project truck for shop lessons and to be the son's truck when he gets his licenese in a couple years he is removing the blown engine piece by piece.
It started out with a bent valve that after running it for 5 minutes with a gallon of diesel in the crankcase then rodded hard with only ATF in the crankcase for about 15 miles a rod broke on the hole with the bent valve. Being 20 miles from home we drained the ATF out and added 15W-40 Rotella and drove it home at about 50 MPH. About 100 foot from the driveway the rod came out leaving a hole in both the block and oil pan. I drove it on up the hill with it pumping out all of the oil. I was going to use the starter to get it upon to the dolly but it tried to start instead so I just drove it up onto the dolly. When we got it to my friend's shop we drove it into the lift bay on its own power. These 4.3's are tough engines and the details here was covered in another thread.
Tonight when we pulled the head where #5 was our initial error code misfire the piston was really marked by the bent valve. The one main we pulled had spun. I wanted to trash the engine to remove temptations to patch it up after we had the 119K mile engine setting in the back of the Nissan.
The funny part is the 5 minute diesel only flush then 25 minutes of hitting 4K-5K in 1st and second on some crooked back roads running pure Dex/Merc ATF did NOT clean the varnish build up of the push rods, wrist pins, ect. I will still flush with Sea Foam per directions on the can but NEVER put ATF or diesel in a running engine AGAIN.
After working New Years and every evening this week on installing another engine and transmission and tearing down the 1/2 million mile 4.3 part by part we have gained a better understanding of how they work and how tough they are.
We put new oil cooler lines on but because when we back flushed the oil cooler we flowed out a lot of bearing metal the discussion came up in the shop as how to delete the oil lines IF we had not purchased a new radiator. Since this was a class project we went overboard $$$ because the used engine and 5-speed transmission appear to be in good condition. Got the differential drained, cleaned and refilled with synthetic as well as synthetic in the engine and transmission. Got down to welding of the exhaust pipes before calling it a night. In the morning we will learn if we wasted a lot of money and time. Regardless there was a lot of learning going on.
Hope our new oil cooler lines do not leak.