Melling O-ring blue one or black?
Melling O-ring green one or black? I am installing a melling oil pump. It came with 2 o-rings a green one (thicker) and a black one (stock size). Which one do I install on the pickup tube? Thanks in advance, Ken.
Last edited by KSrebuilder; Feb 17, 2007 at 07:57 PM. Reason: Wrong discription
Ken,
I've run into this before when I ported my stock oil pump. I ordered both o-rings and tried them both. Only one of the two really filled out the gap between the oil pick-up tube and the pump inlet. If I were you, I'd oil them both and try them both and see which is the better fit. I suspect that the oil pump inlet inside diameter is the same on all pumps. However the oil puck-up tube outside diameter may vary depending on P/N. Sorry I can't be more specific.
Steve
I've run into this before when I ported my stock oil pump. I ordered both o-rings and tried them both. Only one of the two really filled out the gap between the oil pick-up tube and the pump inlet. If I were you, I'd oil them both and try them both and see which is the better fit. I suspect that the oil pump inlet inside diameter is the same on all pumps. However the oil puck-up tube outside diameter may vary depending on P/N. Sorry I can't be more specific.
Steve
The green o-ring is a little too big. It doesn't want to go into the pump without a lot of pressure and when it does the pickup tube doesn't want to seat. I also changed out the red spring for the blue after reading forum posts on this issue. The last thing I want to do is have to take off the oil pan after the motor is installed.
Originally Posted by KSrebuilder
I am installing a melling oil pump. It came with 2 o-rings a green one (thicker) and a black one (stock size). Which one do I install on the pickup tube? Thanks in advance, Ken.
Originally Posted by KSrebuilder
The green o-ring is a little too big. It doesn't want to go into the pump without a lot of pressure and when it does the pickup tube doesn't want to seat. I also changed out the red spring for the blue after reading forum posts on this issue. The last thing I want to do is have to take off the oil pan after the motor is installed.
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I put the old oil ring on and stuck it in the old pump and the new pump. It fit the same, not real snug but not loose either. I then put the new black o-ring in the old pump and also the new pump. It fit the same in both pumps, slightly tighter than the stock one. It did take a little more pressure to get it in when the stock o-ring took no pressure. I then put on the green larger o-ring and it was difficult to get in but it would go in. At rest when pushed all the way in there was a 1/16" gap before the tube would seat. The smaller new o-ring had a 1/32" gap at rest. I think the smaller o-ring is the correct fit compairing it to the old stock one. Thanks for all your input, Ken.
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my felpro timing cover kit also came with 2 o rings green and a black. stock was grey i believe. i could not get the green one in right! so i used the black one. I kinda wish i reused the old one. I bought this motor and trans and put the new ls6 katech bluprinted cnc ported oilpump before i even started up motor in my swap vehicle. at idle with 0w30 catrol germen syn i get 28 to 30psi and cruising i get 40 to 45psi on freeway. Does this seem ok ? If i used wrong o ring would i be getting any kinda pressures like that ?
Called Melling today and they e-mailed me a copy of the instructions. There are 2 different styles of pickup tubes. One tube (like mine) just has a bead maybe a inch or so from the end of the tube, this uses the smaller black o-ring. The other style of tube has the same bead but the end of the tube is flaired a little, this uses the green o-ring. It appears that according to the drawing that the green o-ring just fits between the flair and the bead. I have no idea what tubes were manufactured when except mine is a 2002. Ken
Originally Posted by KSrebuilder
Called Melling today and they e-mailed me a copy of the instructions. There are 2 different styles of pickup tubes. One tube (like mine) just has a bead maybe a inch or so from the end of the tube, this uses the smaller black o-ring. The other style of tube has the same bead but the end of the tube is flaired a little, this uses the green o-ring. It appears that according to the drawing that the green o-ring just fits between the flair and the bead. I have no idea what tubes were manufactured when except mine is a 2002. Ken
