Sounds like maybe it is a late model manifold with the hole for the O2 sensor. Is it a fine thread about 3/4" in diameter?
If so you can get a plug off E-Bay cheap enough.
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| Author: | thebilgerat [ Tue Jul 04, 2017 8:20 am ] |
| Post subject: | Threaded hole in exhaust manifold firewall side |
Hi all - new member here. Lurker for a while. I just picked up a 1982 D150 with a slant. Been driving it for a couple of days when it sounded like the exhaust flange broke from the manifold. Turns out there must have been a plug in a large hole on the firewall side of the manifold right below the heat exchanger. I did my best with what I had (a brass pipe plug and some epoxy) but that didnt last long from the heat cycle. Can anyone tell me the thread pitch/dimensions/etc of that hole? I'd like to pick up an iron plug that will hopefully not heat cycle as hard. |
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| Author: | Rick Covalt [ Tue Jul 04, 2017 8:41 am ] |
| Post subject: | |
Really the brass plug should have been fine if it threaded into the manifold? |
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| Author: | thebilgerat [ Tue Jul 04, 2017 8:49 am ] |
| Post subject: | |
It threaded in, but loosely. I did my best to figure out interior thread diameter with a caliper and get something close at the hardware store. |
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| Author: | slantzilla [ Tue Jul 04, 2017 9:19 am ] |
| Post subject: | |
Sounds like maybe it is a late model manifold with the hole for the O2 sensor. Is it a fine thread about 3/4" in diameter? If so you can get a plug off E-Bay cheap enough.
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| Author: | DusterIdiot [ Tue Jul 04, 2017 10:02 am ] |
| Post subject: | x2 |
Quote: Sounds like maybe it is a late model manifold with the hole for the O2 sensor.
If this is correct, most auto parts stores should have a steel O2 sensor "plug" that can be installed.
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| Author: | SpaceFrank [ Tue Jul 04, 2017 12:39 pm ] |
| Post subject: | |
It should be a standard 18 mm O2 sensor plug. There are steel ones all over the place, including eBay. Not sure if there's a thread sealant recommended for these. |
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| Author: | DusterIdiot [ Tue Jul 04, 2017 1:10 pm ] |
| Post subject: | I'd... |
Quote: Not sure if there's a thread sealant recommended for these.
I used RTV Copper since that's about as high temp as you can get over the counter... after a while driving it'll carbon up and seal anyway...
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| Author: | emsvitil [ Tue Jul 04, 2017 5:39 pm ] |
| Post subject: | |
Dorman 65220 oil pan plug (18mm x 1.5 thread, 19mm hex head) |
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| Author: | Reed [ Wed Jul 05, 2017 8:34 am ] |
| Post subject: | |
An oxygen sensor will plug that hole really well and let you run an air/fuel ratio gauge to help tune your motor. |
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| Author: | thebilgerat [ Wed Jul 05, 2017 9:25 am ] |
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Awesome - thanks for the info! I'd love to run an O2 sensor as it was my plan for tuning anyways. Hopefully the shop manual comes soon so I can start seeing what the PO did and didn't do when they removed all the smog equipment. |
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