hoover mod gone wrong

[esde]

well, I didn't do this, but whatever happened, the result is the same

I made a chamber to pre lube my engine

and found the added bonus is that I found a major oil leak without the engine running. The pic is lousy but you get the overall idea

I can't get a straight look as the sleds and header are blocking the view, but I was able to look using a small inspection mirror. There is a steady stream of oil coming from a spot , right where you would drill through deepening the bore from the cam bearing. I can only think I got too close and there is some porosity in the case casting there. If that's the case, maybe I can drill it straight through , tap, and plug it
Any other thoughts? Welding in that recess is clearly out of the picture.. I'm confident that the drillings to add oil to the 1-2 side lifters could be plugged back up, is there another way to supplement the 1-2 side oiling? Or am I taking another case off of the shelf to prep

[flyinglow94]

It would be difficult to get a good weld in there but you might be able to put a plate over it and weld it up, kind of like the plate behind #3. When I had drilled my case for the mod I went at an angle through the bearing saddle to avoide the pocket all together.
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[vince1]

Ouch I think I'd prefer to see the first pic since you now have entirely built the engine around this case

Maybe you can do what you said, but for a first try, and to keep the hoover mod, I'd clean the recess very well, even grind it a little with a dremel to have "fresh" magnesium, then fill the recess with some JB Weld, then if it doesn't work, I'd plug it back (2 plugs), one in the cam main, and one drilled from the front of the case.

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[andy198712]

I'd epoxy metal or just plug where it burst through like you say , and keep the hoover mod.

I did this drilling recently and angled the bit as much as one can to ovoid it, and angled the vertical drilling so it would meet sooner, if that makes sense
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[jbbugs]

I had the exact same thing happen to me. I filled a section of that cavity with J.B.Weld, then re-drilled it. I've run (2) 14-Hour endurance races in my Chumpcar with it. I beat this thing pretty hard when I'm racing, and thankfully, there has been No leaks, no problems so far.
The motor also has seen oil temps as high as 260F degrees. Don't sweat it.
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[esde]

[raul arrese]

If you can get in there you could get like a reamer or whatever you have and poke at it till you get the hole that's obviously there and make a coned plug out of aluminum and hammer it into the hole like a wedge , same way the factory plugs the galleys , then clean and fill the complete hole in case with j.b weld the 24hr one ...

[vince1]

Or you could make a small tube installed with some block press in the oil galley, then redrill from the cam saddle....

Like a 6mm OD and 4 mm ID tube, redrill the oil galley to 6.5 untill The first cam saddle then press the tube until the front of the case.

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Click here for my full pix detailed 2165 engine build with beehive valvetrain.

Sorry for my poor English, I'm a French guy ...

[esde]

So, no point in sitting around feeling sorry for myself so jumped right in this eve. From the outside no issues:

Hold a light up and look again

from the inside there is some chatter in the bore, not a very cleanly drilled hole, and this is the result
I tapped it for 1/8-27npt, and a plug fits ok

but 2 issues I am not happy with
1. it blocks the extra hoover drilled oil galley
2. the case is still pretty thin where the other oil galley intersects the one I just plugged
I am going to try to machine a small flanged plug, and use an o-ring as well as thread locker. If I can see where the plug snugs down, possibly it can be modified so the two oil passages are still connected. Fingers crossed

[fastone]

I have to ask why you would ever do this mod, I built many USAC midget engine's for Auto-Craft back in the day
and we never needed anything like that and we won a lot of race's.

Your building a street car engine.. and you need this why?

BTW who the hell is this Bob guy did he ever win any kind of racing.

[koolkarmakombi]

[esde]

[mark tucker]

I drill all mine at an angle so it dosent get close to that cavity.pretty easy.

[esde]

For what it's worth, just general information: Last night I measure the location of the oil passages relative to the case on the case I'm fixing, and another I have sitting here. On the case that is pictured, I measured from the cam bearing to the bottom of the intersecting oil passage, the long one through the lifter bore. 1.73" same as what Hoover lists. From there to the outside of my case is less than .1", too thin for comfort. Angling the bit from the cam bore probably helps, but using a slightly smaller aircraft bit for the intersecting hole will be my path on the next case. Comparing the other case, the casting seems a bit different, but there is no way to be sure as there isn't any straight surfaces, and I haven't blown a hole through the case yet with which to measure. The cam saddle to lifter bore hole is slightly smaller than 1.73" though, 1.68, so there are variations for certain. Bottom line is that you just have to be more careful than I was, measure 12 times and drill slowly.

[mark tucker]

I use a 3/16" or .225" bit for mine. just beware you can do the same thing inside the case if you angle it too much....so... get all ducks in a row befors the final shot so you dont have one running around like a chicken with it's head shot off. you can also make a lifter bore bushing for the drill bit so it keeps the bit more inboard if your using a smaller bit like I do. every little bit helps from doing extra work.

[esde]

Made the plug, the flange idea wouldn't work, as there isn't enough room. The plug is opened to keep the oil passages connected, and was installed with red loctite. I used some JB weld on the last turn and a half of the plug, and then filled around the plug. If it ever comes loose I'll follow up, but for now it holds pressure fine
the modified plug is the lower one

Here is the notch to keep the passages connected

SD

[fastone]

[andy198712]

It mists up there and flies everywhere take off your rocker cover and rev the engine.... Wear PPE
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[esde]

[mark tucker]

you can also get allen head plugs there a little easyer to install.