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- Jul 23, 2011
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As part of my BBC build http://forums.iboats.com/forum/engin...ll-the-admiral I had picked up a mark 4 (1965-1990 454) 8-quart mercruiser cast aluminum oil pan. The problem is I picked up a Gen V/VI core motor for the project because I wanted a 1-piece oil seal and roller cam and valve train.
So after weeks of trying to sell the pan on CL and Ebay, I thought.... what the heck. Lets look up the dimensions, and see if we can get it to fit. Not to mention the admiral said I have an oil pan, so I cant buy another until I sell it or make it work.
After a bit of measuring, the mods are easier than I thought.
So in true hot rodding fashion, its time to make things work the way I grew up doing. Have the skills and access to the right equipment, so why not. I am posting this here because it is BBC related, and not brand specific. Also because there may be another boater trying to do the same thing. In the end I will have an 8-quart cast aluminum oil pan on my Gen 6 motor.
Here is a link to the photobucket folder, http://s1343.photobucket.com/user/sc...?sort=3&page=1
First step - see what hits. Front lip is too long, rear lip and seal surface is too small of a diameter.
I laid the pans side by side, even went so far as transfer the dimensions onto a chunk of plywood.
First mod to do is cut off the lip on the front of the oil pan. Both pans have the same dimension in length, and the radius for the front pan gasket to timing cover is the similar (had to put a bead of weld on it).
Next mod - open the back side radius a bit (ok, a lot).
After a bit of grinding and clearancing and material removal with a belt sander, it fits the block.
Next mod - make a jig to re-drill the holes. I ended up indexing the oil pan aft about 1/4" to get the pan to sit properly. All the mounting holes will be welded shut and re-drilled.
I drew up the jig for the laser to burn out tomorrow. Will post more then.
So after weeks of trying to sell the pan on CL and Ebay, I thought.... what the heck. Lets look up the dimensions, and see if we can get it to fit. Not to mention the admiral said I have an oil pan, so I cant buy another until I sell it or make it work.
After a bit of measuring, the mods are easier than I thought.
So in true hot rodding fashion, its time to make things work the way I grew up doing. Have the skills and access to the right equipment, so why not. I am posting this here because it is BBC related, and not brand specific. Also because there may be another boater trying to do the same thing. In the end I will have an 8-quart cast aluminum oil pan on my Gen 6 motor.
Here is a link to the photobucket folder, http://s1343.photobucket.com/user/sc...?sort=3&page=1
First step - see what hits. Front lip is too long, rear lip and seal surface is too small of a diameter.
I laid the pans side by side, even went so far as transfer the dimensions onto a chunk of plywood.
First mod to do is cut off the lip on the front of the oil pan. Both pans have the same dimension in length, and the radius for the front pan gasket to timing cover is the similar (had to put a bead of weld on it).
Next mod - open the back side radius a bit (ok, a lot).
After a bit of grinding and clearancing and material removal with a belt sander, it fits the block.
Next mod - make a jig to re-drill the holes. I ended up indexing the oil pan aft about 1/4" to get the pan to sit properly. All the mounting holes will be welded shut and re-drilled.
I drew up the jig for the laser to burn out tomorrow. Will post more then.
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