oil pump selection
#11
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Re: oil pump selection
I would probably try to avoid the merc pump. I know the pump they use on the 500efi and 525efis have the gasket under the top cover. In my mind this is something I always avoid and replace with a better quality pump that is a machined fit. Such as Melling. I am not sure who makes these pumps I would assume it is a GM part #.
#12
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Re: oil pump selection
The Melling punp is about 40.00 from any auto parts supplier. I hate to think what Mercruiser sells it for, probably a couple hundred. Go with the Melling and a new pick up. Weld or braze the pick up.
#14
Re: oil pump selection
M77 Hv . Do yourself and your motor a favor and deburr the gears inside on a wire scratch wheel or file by hand. This will help keep the pump from wearing itself out. BBB
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Re: oil pump selection
By using a high volume pump do I have to worry about high pressures and stock clearances. I have got the block assembled and balanced so opening up oil passages is out. What is a NII rod in welding? Will a wire fed mig do?
Last edited by team Tickfaw; 12-05-2005 at 10:27 AM. Reason: miss-spelling
#16
Re: oil pump selection
Mig is no good for that. Ni rod is nickel. Pump manufacturers suggest taking the pump apart to weld, I have good luck just tack welding with a 55% nickel rod. Forney sells a good rod and you can get 'em at any Ace hardware. for apx $5 for a pack of them. Also make sure you use a big enough pan in order not to pump all the oil out of the pan before it returns back down. BBB
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Re: oil pump selection
I will be using the stock stamped steel oil pans. When starb. motor left it took the 14 qrt oil pan with it. After pricing these I decided to run the stock pans on both new engines. Everything is starting to come together now but at the point of selecting oil pumps. I was told not to run high volume if I had not opened up oil passages. Any insight on this?
#18
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Re: oil pump selection
The oil pump number I gave you is high volume and stock pressure. All I've ever used with no issues. Big or small block.
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