Schumann oil pump ?
October 25th, 2022, 06:31 AM
#3
Registered User
Join Date: Sep 2011
Location: Plano, TX
Posts: 1,900
Yup, I use one. It's a blue printed melling. Is it worth it? I dunno.
They buy batches and mix/match housings and gears to get the best side clearance. Then they mill the housing to get the best top/bottom clearance. The bottom gets milled flat. They also drill holes in the bottom of each gear tooth - I assume that's a cavitation thing. The one I got several years ago had the green spring with a bolt spacer instead of using the pink spring Melling now supplies. Oh, and they replace the bypass spring retention carter pin with a tiny bolt and two nuts.
The large bypass one has some other modifications to it.
You can also just get a Melling and check clearances yourself, and exchange if you don't like it. It's always a good idea to thoroughly inspect and clean parts anyway.
They buy batches and mix/match housings and gears to get the best side clearance. Then they mill the housing to get the best top/bottom clearance. The bottom gets milled flat. They also drill holes in the bottom of each gear tooth - I assume that's a cavitation thing. The one I got several years ago had the green spring with a bolt spacer instead of using the pink spring Melling now supplies. Oh, and they replace the bypass spring retention carter pin with a tiny bolt and two nuts.
The large bypass one has some other modifications to it.
You can also just get a Melling and check clearances yourself, and exchange if you don't like it. It's always a good idea to thoroughly inspect and clean parts anyway.
October 25th, 2022, 06:36 AM
#4
Registered User
Thread Starter
Join Date: Jan 2020
Posts: 87
Yup, I use one. It's a blue printed melling. Is it worth it? I dunno.
They buy batches and mix/match housings and gears to get the best side clearance. Then they mill the housing to get the best top/bottom clearance. The bottom gets milled flat. They also drill holes in the bottom of each gear tooth - I assume that's a cavitation thing. The one I got several years ago had the green spring with a bolt spacer instead of using the pink spring Melling now supplies. Oh, and they replace the bypass spring retention carter pin with a tiny bolt and two nuts.
The large bypass one has some other modifications to it.
You can also just get a Melling and check clearances yourself, and exchange if you don't like it. It's always a good idea to thoroughly inspect and clean parts anyway.
They buy batches and mix/match housings and gears to get the best side clearance. Then they mill the housing to get the best top/bottom clearance. The bottom gets milled flat. They also drill holes in the bottom of each gear tooth - I assume that's a cavitation thing. The one I got several years ago had the green spring with a bolt spacer instead of using the pink spring Melling now supplies. Oh, and they replace the bypass spring retention carter pin with a tiny bolt and two nuts.
The large bypass one has some other modifications to it.
You can also just get a Melling and check clearances yourself, and exchange if you don't like it. It's always a good idea to thoroughly inspect and clean parts anyway.
October 25th, 2022, 10:47 AM
#6
Registered User
Join Date: Apr 2018
Location: Los Angeles, CA
Posts: 825
October 26th, 2022, 06:06 AM
#7
Registered User
Join Date: Sep 2011
Location: Plano, TX
Posts: 1,900
Fun story: this is now permanently in my brain because I was chasing a low oil pressure problem last year. Finally spun up the oil pump with the distributor out to find that I had an *external* oil bypass. Back when the block was machined, the operator sent the boring bar too low and it cut into the main oil feed galley leaving a pea size hole. At the time I didn't know what was going on so assumed it was splash from the oil pump or something. That was fun to fix.
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