Hey I just purchased a new melling m155 Oil Pump, wet sump 3/4 in Inlet plus new pickup for my 350 4x4 tahoe chevy S B. Did the pickup measurement and pre oil prime and watched for oil to show at the rockers, oil flow looked OK. Was told by melling techs it would produce 60 plus PSI which it only produces 40 PSI cold and 30 after engine warmed up. But the real problem is the pump is the most noise pump I've ever heard. Pump sounds like it's grinding or whining like crazy untill engine reaches the 190 degree operating temp but you can still hear the sound just not as noticable but clearly still there! Almost like running timing gears sound but some what louder! I'm real disappointed as there was a real mellow sound from the pump when I was priming the engine. If not for having to pull my engine again to get to the pump I put the old GM pump back in ASPA which produced a soild 60 cold and soild 50 warmed but weather is just to cold right now. This GM pump had over 100 thousand miles with oil changes every 2,000 needed or not so thought it was time to replace even though inside of old pump was excellent and pressure was always consistent. Once the weather gets warner, garranteed I will. Even removed engine belt to make sure it was not the water pump or AC. I should have not listened to the tech saying melling pumps are better that GM pumps. All my bro's who said melling would not be their first choice but rebuild a lot of engine are saying after hearding the sound that this melling pump was making they won't be chancing replacing any oil pumps for their customers or friends with melling made in china junk. I even purchased a automotive stethoscope, sure enough it's the melling oil pump. Have done two oil changes with no sign of any metal shaving on my magnetic oil plug. The sound is unnerving and has my attention all the time while driving, can't wait to change it out!
What dont you lnow the shaft cant fall off once it installed the coller on the shaft will not let the shaft come off out ---- new dude its alright to be ignorant
Hey I just purchased a new melling m155 Oil Pump, wet sump 3/4 in Inlet plus new pickup for my 350 4x4 tahoe chevy S B. Did the pickup measurement and pre oil prime and watched for oil to show at the rockers, oil flow looked OK. Was told by melling techs it would produce 60 plus PSI which it only produces 40 PSI cold and 30 after engine warmed up. But the real problem is the pump is the most noise pump I've ever heard. Pump sounds like it's grinding or whining like crazy untill engine reaches the 190 degree operating temp but you can still hear the sound just not as noticable but clearly still there! Almost like running timing gears sound but some what louder! I'm real disappointed as there was a real mellow sound from the pump when I was priming the engine. If not for having to pull my engine again to get to the pump I put the old GM pump back in ASPA which produced a soild 60 cold and soild 50 warmed but weather is just to cold right now. This GM pump had over 100 thousand miles with oil changes every 2,000 needed or not so thought it was time to replace even though inside of old pump was excellent and pressure was always consistent. Once the weather gets warner, garranteed I will. Even removed engine belt to make sure it was not the water pump or AC. I should have not listened to the tech saying melling pumps are better that GM pumps. All my bro's who said melling would not be their first choice but rebuild a lot of engine are saying after hearding the sound that this melling pump was making they won't be chancing replacing any oil pumps for their customers or friends with melling made in china junk. I even purchased a automotive stethoscope, sure enough it's the melling oil pump. Have done two oil changes with no sign of any metal shaving on my magnetic oil plug. The sound is unnerving and has my attention all the time while driving, can't wait to change it out!
That does not look like a weld , a formed tube bead ?
Use kids Silly Putty to check oil pickup housing to oil pan clearance .
What dont you lnow the shaft cant fall off once it installed the coller on the shaft will not let the shaft come off out ---- new dude its alright to be ignorant