I'M A DUMB AS I striped at oil press switch on a 305 - Team Camaro Tech
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post #1 of 4 (permalink) Old Sep 27th, 05, 03:39 PM Thread Starter
 
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I'M A DUMB AS I striped at oil press switch on a 305

I'M a dumb *** and have managed to strip the threads on the oil pressure switch above the filter housing. Can't get the 1/4 18 npt tap to bite, has anyone drilled and installed a heli- coil with the engine in the car. If so i'm having trouble finding the Heli- coil. Any help is good
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post #2 of 4 (permalink) Old Sep 27th, 05, 06:46 PM
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Re: I'M A DUMB AS I striped at oil press switch on a 305

I doubt a helicoil will work for that. Helicoils are made for straight threads used to fasten hardware. Your oil pressure sender is pipe thread and meant to seal against pressure.

Dave
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post #3 of 4 (permalink) Old Sep 27th, 05, 08:28 PM
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Re: I'M A DUMB AS I striped at oil press switch on a 305

Any chance you could get a nipple with more threads to reach past the damaged threads and tighten? If you could you could use an elbow or coupler to connect to a new sending unit. I would use teflon tape and don't overtighten.
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post #4 of 4 (permalink) Old Sep 29th, 05, 10:54 AM
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Red face Re: I'M A DUMB AS I striped at oil press switch on a 305

The Heli-Coil set you need is #5407-2 for 1/8"-27 NPT.
The good news is they do make NPT thread repair kits... the bad news is they are very expensive.
I have just 2 sizes in the shop and each 'kit' was over $150. ea.
Stripping the threads on these fittings is not all that uncommon. When installing hard steel senders in a soft cast block the threads will often become galled and then fail the next time someone services the sender.

As others have said, try chasing the threads slightly with a good NPT tap and then reinserting the sender to see if you can get some good thread contact.
You may also want to try increasing the amount of threads on the sender itself by using a NPT Die and making the threaded section a little longer.
Another option would be to chase the original hole threads as best you can with an NPT tap and then using a pipe plug with Loc-Tite on it to plug this hole and using another Oil pressure source such as the one in the front of most blocks.

After using any of the tapping methods, I would recommend you remove the coil wire and crank the engine over a few turns to build some pressure to blow out the pieces. I know this sounds 'messy' but, it can be done with minmal mess if you cover the area with some rags and be ready with a drip-pan to catch the drips.
You definitly don't want stuff getting back into the oil passages...

Hope some of this helps;
John

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