oil pump selection
 

Does anyone have the part number for a engine oil pump used in a 89 mercruiser 454? With the passing of katrina all my usual boat part stores are gone. Is there a cross over pump I could get at the local auto part store. One more thing, do I have to re-use the pickup from old one? It is welded on from fact.
thanks

Re: oil pump selection
 

For the big block application (and I think...I said think) They are the same for like 1968-1999, here is the listing for the high volume normal pressure pump, screen, and drive.

Depending on the capicity of the pan (7 quart?) Should be Melling Pump #M-77HV, Screen Melling #241S and Melling oil pump drive #IS77.

You will need to have the new screen welded to the pump. You should also be able to cross these numbers with other manufactures at your local parts store.

Hope that helps,
Dave

Re: oil pump selection
 

Thanks, I will look into this and I will have to look and see what a stock 454 oil pan cap. is. Do you know right off hand? Thought that I might get a pump from mercury but it was unclear if it came with pickup. Plus I'm sure you are going to pay more.

Re: oil pump selection
 

I think the Mercury does come with a pickup. I would go with an after market pump like the Melling and have someone weld the screen on for you. Be sure to see if those numbers will work with your application. Any "good" parts store will sell Melling and have access to a cataloge with pictures.

Good luck,
Dave

CHEVROLET CARS & TRUCKS396-454 1965-94 8Cyl (396 65-70 BORE 4.094) (400 70-71 BORE 4.125) (402 72 BORE 4.125) (427 66-69 BORE 4.250) (454 70-94 BORE 4.250)

OIL PUMPS
Part #10770 (M77HV) HI VOLUME PUMP-25% ADD’L VOL OF OIL THAN STOCK PUMP. INCLUDES I/S SHAFT W/STEEL GUIDE, USES STOCK 3/4” PRESS-IN SCREEN.

*Note: The mesh of the screen should be 3/8” to 1/2” above the oil pan.

From Melling!

Re: oil pump selection
 

The one from merc does come with the pickup but big $$$. If you have the sheet metal pan its 8 quarts. The cast aluminum one is closer to 6. You can use a dremel with a cutoff wheel to remove the weld from the existing pickup and reuse it but not recommended. Especially if from an engine failure.

Re: oil pump selection
 

Thanks for the information. I purchased 2 complete 454 take outs that were running fine. I guess the way to go on this would be to cut the pickups off the old pumps and install them on the new pumps. Heat will not damage the pump? Has anyone epoxied them in?

Re: oil pump selection
 

We have relocated to Ponchatoula, as we were wiped out by Katrina, and should have the parts you need in stock. Feel free to call us if we can help you in any way. Any business is greatly appreciated. Thanks

TMP

Steve: 504-415-6681
Eddie: 504-416-3607

Re: oil pump selection
 

Weld or Braize. Just a good spot so it wont fall off, you dont have to go all the way around. I always remove the pressure relief spring as it can get weak from the heat.

Re: oil pump selection
 

The screens are less then $10 each....I'd replace them if it were me. By the time you cut them off, clean them and re-weld them....Is it really worth it?

Dave

Re: oil pump selection
 

To TMP,
Great to hear from ya'll and that sounds perfect to me. We live in Tylertown Ms but keep our boat at the warsaw. Boat name "FARFROMPUKEN". My wife has been to the shop in slidell before. Have met one of ya'll at sun buns. I belive he was in construction.
Hope no one was hurt during storm. Still have the "cyclone" ? Last time I spoke to one of ya'll you were talking of building something in the 175-200 mph range.
I will call ya'll monday and hopefully I can get two complete pumps. I will have to get directions to pick up. Just love it when a plan comes together. This web site is a great place.

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 #.

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.

Re: oil pump selection
 

Tack weld with NI-rod. Brazing with torch makes too much heat before the bronze flows. --- Jer

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

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?

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

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?

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.