Oil filter adapter o-ring replacement-how to gmc 1991 k1500 5.0l

Remove the oil filter and there is a nut that you take off (same threads as oil filter) the oil filter adapter will become loose, continue to slide it off, on the engine side of the adapter is the O-Ring, replace the o-ring and install in reverse order.

Hi Juan, I think it would be more advisable to replace the oil filter which comes with the seal. Regards John

it might not be completely tightened down by hand all the way

Make sure the seal from the old filter is not still stuck on the housing. If it is it will leak for sure. I always smear some oil on the new filter seal before putting it on. I also fill the new filter with oil.

You can purchase a seal kit from your local gm dealership.It consists of two o-rings.Remove the two bolts in the center of the oil filter adapter.

16mm 3/8 drive short socket. 3/8 drive ratchet wrench. turn left to loosen and right to tighten

there should be 1 nut and stud holding the lines to the housing. I would suggest replacing the upper o-ring for the oil filter adapter at the same time. The oil cooler hoses are also prone to leak, if so, you want to replace evreything while you are there.

First, make sure there isn't an old filter "o" ring stuck to the filter adapter. Sometimes when removing the old filter, the "o" ring stays, and this will leak oil, after installing the new one, as you will have two "o" rings together.
If this is OK, then inspect the adapter for cracks, or bad threads. The adapter is what your filter threads onto, and this is replacable.

The lines can be disconnected from both ends and the bracket removed but to remove the lines from the front (they cannot be removed to the rear) loosen and remove the drivers side engine mount bolt. Use a block of wood between a floor jack and the cast aluminum oil pan and jack the engine assy. up slightly (just enough to "snake" the oil filter adapter lines by the drivers side engine mount. Leave engine jacked up slightly while you "snake" the new lines into position and install the end at the engine oil filter adapter. You can then lower the engine reinstall engine mount bolt and finish the install of the lines by installing the oil filter end of the adapter lines and attach the bracket (that comes with the GM lines) to the block.

common oil leak on those vehicles is the "quick connects" where the oil lines go into the oil cooler (what i believe you are calling the "doble") replace the o-rings on the quick connects for the lines