Dave in Texas Posted September 11, 2008 Report Share Posted September 11, 2008 I've removed the oil-filter adapter and oil tube. The gasket under the adapter was in bad condition and the o-ring for the other end of the tube wasn't the correct piece. I've got the gasket and will receive the correct square-cut o-ring tomorrow. I'm concerned if I have an o-ring missing. Under the flange of the oil-tube there is a grooved land that might be for an o-ring. (There was no ring there, but whoever worked on this before might have left it off. The bottom o-ring was not the OEM part.) The point on the block that the flange covers is chamfered as if to make a seal. The GM exploded parts diagram for this area does not show an o-ring for this groove, but it does not show the flange on the tube either. Anyone have any experience with this oil-tube sealing? Thanks for any help, I appreciate all advice. GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
KHE Posted September 11, 2008 Report Share Posted September 11, 2008 There should be o-rings at each oil cooler tube connections. There is a gasket and a large o-ring that seals the oil filter adapter to the engine block. I'm not sure where a square cut o-ring is used. Have you checked with the dealer parts counter? They should be able to provide all the correct parts. The oil filter adapter gasket and the large o-ring are usually like stone from the thermocycling and age they've been in service. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Dave in Texas Posted September 11, 2008 Author Report Share Posted September 11, 2008 Both holes in the adapter use the same gasket. The one for the oil-tube is all chewed up and I think that is where my leak was. The square-cut, but round o-ring for the bottom of the tube will arrive at the dealer Thursday. The exploded parts diagram is what the parts guy at the dealer gave me, but at that time I'd not gotten into this job, so I didn't know what I'd run into. I'm almost sure there should be a ring under the oil-tube flange, but since that diagram doesn't show one Or that flange, so I'm at a loss. The parts guys only know what they see on the diagram, so I was hoping someone would know. I may put one in anyway.....I don't see what it would hurt and it would seal the bottom of the tube-flange to the tube hole in the block.....Thanks for the reply! GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
KHE Posted September 11, 2008 Report Share Posted September 11, 2008 I replaced the oil filter adapter and gasket on my Fleetwood awhile back. Thee was a large diameter o-ring (3" in dia.?) where the adapter casting mates to the engine block. That o-ring had a round cross section but appeared somewhat square due to the compression set over the years it had been in there. I know it is not the same engine but it seems as though the sealing methods would be the same. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Dave in Texas Posted September 11, 2008 Author Report Share Posted September 11, 2008 Fleetwood newer than '87? If so, must be a different adapter to block configuration. Mine is rectangular and not gasketed.....at least there wasn't one there when I took it off. GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
KHE Posted September 11, 2008 Report Share Posted September 11, 2008 Mine must be different - it is a '93 with a 5.7L (350) engine. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Dave in Texas Posted September 12, 2008 Author Report Share Posted September 12, 2008 After replacing the oil-tube gasket and o-ring, the oil leak remains. Same area/same quantity. Only things left are a rear-main seal leak or camshaft boss crack. Trouble is, the transaxle has to come off......expensive diagnostic if a block crack is the problem. It has been suggested to me that a 4.9L block can replace my 4.1L and all the pieces/parts from my engine will transplant to the 4.9 block. I'm concerned about the 4.1 heads on the larger bore 4.9 block. Anyone have any experience with this operation? Thank you for any info/advice. GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
Dave in Texas Posted October 19, 2008 Author Report Share Posted October 19, 2008 Pulled the old engine yesterday. RM seal is fine/no cracks in block, so the engine is fine. The massive leak was coming from the tube at the top of the oil-pump. That o-ring was the wrong one. So now I've got an 'extra' engine! 95k miles on it..... GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
Texas Jim Posted October 19, 2008 Report Share Posted October 19, 2008 I sure hate to hear THAT. That turned out to be ONE EXPENSIVE O-RING. But the upside is.. (if there is one)... you have a new engine in it now. Link to comment Share on other sites More sharing options...
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