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Jul 21st, 2025 | | | | Joined: Sep 2009 Posts: 433 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 433 | While extracting the pilot bearing I discovered this Expansion Plug in the back end of Crank. Is it covering a bearing ? The pilot bearing covers it . Bigger viewOn a 1960 235 engine with Hydra-Matic transmission.
Last edited by healingbear; 10/22/2017 11:27 PM.
1954 Chevy 3104 3 Window Hydra-Matic in my family for over 60 Years
Once in a while you get shown the light in the strangest of places if you look at it right... "Scarlet Begonias" Grateful Dead 1974
| | | | | Joined: Jan 2015 Posts: 910 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 910 | When I see a plug like that I think it is a core plug for the cooling
system. Though there is not enough of the engine in the picture
to take a good guess, and I have not seen enough of the backs
of these engines to know for sure. Though somebody that does
will be here soon with the correct answer. Jeffrey | | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | It is the back of the crank shaft. There is nothing but solid metal in that location. No oil passages in a Stovebolt.
Could it be that it is not actually a plug and just a step machined in it.
I don't know about H-Matics, (so@@y about the ab@eviations, but my key between "E" and "T" quit wo@king), but P-Glides have a diffe@ent sized hole in the back of the c@ank, needing a special pilot bea@ing.
Ca@l
(New keyboa@d will be in on the 26th.)
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Sep 2009 Posts: 433 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 433 | Carl, it appears to be a Expansion Plug because it got scuffed when I drilled out the old pilot bearing and I can see a rim on the edge.. I also believed there was not anything behind the pilot bearing besides the hard crank steel.
1954 Chevy 3104 3 Window Hydra-Matic in my family for over 60 Years
Once in a while you get shown the light in the strangest of places if you look at it right... "Scarlet Begonias" Grateful Dead 1974
| | | | | Joined: Sep 2009 Posts: 433 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 433 | Mystery solved. It is the way the inside of the crank end was milled. They left a raised lip at the bottom of the hole. No plug, just steel. I guess the drill bit I used to drill out the pilot bushing was sharper then I thought to leave a scuff mark.
1954 Chevy 3104 3 Window Hydra-Matic in my family for over 60 Years
Once in a while you get shown the light in the strangest of places if you look at it right... "Scarlet Begonias" Grateful Dead 1974
| | | | | Joined: Jan 2015 Posts: 910 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 910 | I just saw the first photo. It was too small for me to tell that is was the back end
of the crankshaft. Eyes are getting old. Jeffrey | | |
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