Mark Shaw Posted September 20, 2005 Share Posted September 20, 2005 Does anybody know if the number 6 piston can be removed from the bottom of a 1931 50 series engine? Only that one rod bearing is bad and I would like to avoid removing the head. My Specifications and adjustments manual doesn't seem to cover this procedure.Thanks,Mark ShawVancouver, WA Link to comment Share on other sites More sharing options...
Mark Shaw Posted September 24, 2005 Author Share Posted September 24, 2005 Well, since nobody answered my question, I went ahead and tried it. If the crank is carefully rotated while removing the piston from the side opposite the cam shaft, it works!Mark Shaw Link to comment Share on other sites More sharing options...
Alexander50 Posted October 13, 2005 Share Posted October 13, 2005 Hello Mark. Nice to hear you have a 1931 model 57. I have a 1931 model 54 and did a lot of mechanic work on it. (if you want to have an impression: look at the memberscars on the BCA-site). Indeed, as you have experienced, you can remove the piston and rod from the bottomside. And I understand you don't want to remove the head, because it's a lot of work. But I have to disappoint you: it is impossible to assemble it from the bottomside without damaging the rings. There is no way to compress the rings with a bushing or so because the space is too tight to slide such a bushing back along the rod. Using your fingers is not a great idea too. So I think you need to remove the head. Please let us know your experience on this. I am still learning. Best regards and good luck. Alex Veen, lexveen@hetnet.nl Link to comment Share on other sites More sharing options...
The Old Guy Posted October 13, 2005 Share Posted October 13, 2005 I purchased a ring compressor that you could disassemble ( I think it was originally for Corvairs) ,and it will fit in a 90 series ,so it should fit for the 50 series also. I reringed my 90 series from the under side many years ago, and it is still running fine. Link to comment Share on other sites More sharing options...
Alexander50 Posted October 13, 2005 Share Posted October 13, 2005 As I said: I am still learning every day. Though that it was possible to fit the piston and rings from below in a model 90 engine is not a garantee it will be possible in a model 50 engine. Compared to a 90 engine the 50 engine is small inside and you have only millimeters space to (dis)assemble. But maybe.. Mark: please let me know if you succeed. Link to comment Share on other sites More sharing options...
Mark Shaw Posted October 15, 2005 Author Share Posted October 15, 2005 Yup, it's done and is currently sitting on display at the Northwest Car Collector's Show in Portland OR. I did it using only my fingers to compress each ring as I pushed up on the rod with one hand. I cut a deep groove in the end of one finger in the process, but it worked. Now I can truthfully say I have blood sweat and tears in that car! Link to comment Share on other sites More sharing options...
Alexander50 Posted October 21, 2005 Share Posted October 21, 2005 Congratulations, next time I will do the same. If you have to remove the head you would probably also have had one or more light injuries. Link to comment Share on other sites More sharing options...
32Buickman Posted November 1, 2005 Share Posted November 1, 2005 Mark:Once you replaced the rings, how was the compression in the no.6 cylinder? Link to comment Share on other sites More sharing options...
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