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Any good ways to bend oil lines?

It's always something... I need to modify a '74 cross under oil line for clearance issues. I tried wailing on it with a vice and mallet, but found that really didn't work. Part of the problem is that the pipe is curved. The pipe is 7/8" in diameter.

Any suggestions for how to do this cleanly, and economically? I've started to look at electrical conduit benders, but they don't work with 7/8" tubing. Also I'd like to get a smaller radius, I think around 4". It would be great to find a solution that would allow making custom oil lines.

I do have access to a press, which might help, if there are jigs that could be used to produce different radius bends in odd shaped pipes.

Any ideas would be greatly appreciated.

-Juan

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Old 10-12-2005, 09:25 PM
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This is just a wild stab at it, but why not try something flexible inside the pipe and just a little smaller diameter, like a hose or a spring. Theoretically, this should prevent the pipe from crimping during the bending process. Then you could bend the pipe over a form of the desired diameter.
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Old 10-13-2005, 10:46 AM
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Heat is your friend, too. Some pack the inside with Sand.
Let us know how it works out.
Doug
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Old 10-13-2005, 10:50 AM
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"I tried wailing on it with a vice and mallet, but found that really didn't work. Part of the problem is that the pipe is curved. The pipe is 7/8" in diameter."

Juan,
Errrr. How does it look after the beating? Does its appearance after recurving matter?

There might be other alternatives such as a partial path using flex hose which might save you some aggravation. A rigid line can only bend so far. Hose allows easier matchup with the next oil fitting. Take relative movement/vibration into consideration as a rigid tube connected between moving parts isn't recommended.

Doug's suggestion of sand might be something you can explore. Cap both ends so the sand prevents tube collapse, then you can try a plumbers helper to nudge it into the shape you require. A 4" radius, however, is pretty tight. BTW, the minimum bend radius for 7/8" (~AN16) flex hose is around 9-10".

Hope this helps,
Sherwood

Old 10-13-2005, 11:44 AM
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