The Stovebolt Site Forums The Shop Area Engine Shop what is this bung?!

Hi guys,

have a look at the photos? this is in the side of a 261 engine I have just picked up?

its in the hole for where the engine would breath?

what's it for? and why would you fit one?


http://i995.photobucket.com/albums/af75/hootschc/20thfeb2013truck003_zps6e7fef09.jpg

http://i995.photobucket.com/albums/af75/hootschc/20thfeb2013truck002_zpsa04ed62e.jpg

http://i995.photobucket.com/albums/af75/hootschc/20thfeb2013truck001_zpsd3873d84.jpg

http://www.oreillyauto.com/site/c/search/Expansion!s!Freeze+Plug/N0290/C0142.oap

That is the hole for the road draft tube (or the hole for the sealed tube for use with the factory PCV system).

That hole is found in all 216/235/261 engines.

That expansion plug, "freeze plug" (block casting hole plug = core plug, or Welsh Plug where you live) is a cob-job part (most likely in an attempt to put together a home-made PCV system).

If it is simply a plug for the hole, and there is no lower-engine breather, I'd drop the pan and check inside the engine.

thanks chaps, Tim, what would be the main thing to look for in the pan / engine? and that the last person was trying to solve?! i took the pan off and apart from a load of sludge, i dont know any history on the engine. compresion is around 100-110 across all six, this is without me completing a valve job.

that would explain the sludge, needs to have a crankcase vent system of some kind. Sounds like someone put that plug in to try to keep oil vapors from comming out the road draft tube.