1937 Buick 66C Posted August 5, 2014 Share Posted August 5, 2014 Good Afternoon all,Because of the interest various folks have expressed in the modification which is made to the coolant bypass valve to address certain overheating situations in our pre-war Straight 8 Buicks, I have posted the files which address this modification to my personal website. This documentation is specific to a 1937 Century, but I believe it is applicable to most pre-war 8-cylinder Buicks, both large and small series.You can read a summary of the symptoms, diagnostics and download the files here:http://2experts.org/Vehicles/Buick/Coolant_Bypass.htm -- Best Regards,Jon B KanasWebsite: http://www.2experts.org Longmont, Colorado; Cultural Center of the Universe Link to comment Share on other sites More sharing options...
danhar1960 Posted August 6, 2014 Share Posted August 6, 2014 Nice article Jon to a very common problem with these old beasts.Danny Link to comment Share on other sites More sharing options...
1937-44 Posted August 6, 2014 Share Posted August 6, 2014 Thanks for posting the article Jon. I haven't had the problem yet, but always nice to have a solution just in case. Carl Link to comment Share on other sites More sharing options...
Guest Jon Barker Posted August 7, 2014 Share Posted August 7, 2014 Interesting article. Could you tell me the exact size of the freeze plug to be used please (I guess 1 3/8"), and if any particular type of metal is needed ? Thanks. Link to comment Share on other sites More sharing options...
pont35cpe Posted August 7, 2014 Share Posted August 7, 2014 I just modified both my Buick engines my `36-233 took a 1 1/16" freeze plug, and the `41-248 took a 1 1/4" plug, which I had to reduce the OD slightly.. Tom Link to comment Share on other sites More sharing options...
Guest Jon Barker Posted August 7, 2014 Share Posted August 7, 2014 Thanks Tom. Just need to get as tight a fit as possible I guess. Link to comment Share on other sites More sharing options...
1937 Buick 66C Posted August 7, 2014 Author Share Posted August 7, 2014 Thanks Tom. Just need to get as tight a fit as possible I guess.I do recall that I smoothed down the surface of the casting with a small grinder (Dremel tool) in order to get a good surface to secure the freeze plug. Fortunately, if the freeze plug does come loose, it can't go anywhere where it might do significant damage. Link to comment Share on other sites More sharing options...
marcnoni Posted March 17, 2015 Share Posted March 17, 2015 Do you know anyone that can do to modification for me. Unfortunately my amatuer mechanic days are over. Link to comment Share on other sites More sharing options...
1937-44 Posted March 17, 2015 Share Posted March 17, 2015 Marconi you might be able to just take yours off and clean it up real good and free the disc. My car's bypass has never been modified and in Charlotte for the Nationals when it was 100 the highest temperature I saw on my gauge was 185 and that was while I was stopped waiting for a train. Carl Link to comment Share on other sites More sharing options...
critterpainter Posted March 25, 2015 Share Posted March 25, 2015 A quick way to accomplish the same thing is to slide a freeze plug into the short hose between the water pump and the t-stat body. Don't forget the small hole for the by-pass. Link to comment Share on other sites More sharing options...
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