mkmac Posted August 9, 2020 Share Posted August 9, 2020 Hi fellas, Dads got a 237 motor with a 7220 behind it earmarked for restoration but has an oil leak. It looks more like engine oil than transmission fluid but only leaks when not running. All we can really see is it around the bell housing but wondering why it only leaks when not running? Im thinking rear seal and maybe when running there's pressure thats enuf to seal it. Also not sure how high the oil level sits in relation to rear crank seal. Any thoughts or suggestions on what to try/test before pulling it down? Thanks. Quote Link to comment Share on other sites More sharing options...
JoeH Posted August 9, 2020 Share Posted August 9, 2020 Rear main seal would make the inside of the bell housing wet and oily. If that's dry then it shouldn't be the rear main seal. Could be oil pan. How substantial of a leak is it that you can tell it's leaking only when turned off? Quote Link to comment Share on other sites More sharing options...
mkmac Posted August 16, 2020 Author Share Posted August 16, 2020 Haven't split it but can wash it off run it for a while and all good, within maybe 30 min of shutting it off, starts to seep, after 2-3hrs starts to form a drip. Leave about a 30cm round oil mark on the ground overnight. Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted August 16, 2020 Share Posted August 16, 2020 Need to see if the inner bell housing is wet all over or just running out from the transmission side It might not be much or could be something more serious Paul 1 Quote Link to comment Share on other sites More sharing options...
JoeH Posted August 18, 2020 Share Posted August 18, 2020 If it's transmission oil it'd probably smell like sulfur/rotten eggs. Quote Link to comment Share on other sites More sharing options...
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