28-04-2021, 08:48 PM
To start with, the usual apology if the question is displaying technical naivety, or possibly ignorance but comments and help will be much appreciated. An engine is being put back together, onto a crankcase and crankshaft that may or may nor have seen much service. Con rods ar first glance were identified, at second glance marks were numerous and confusing. Therefore con rods and big ends were offered up to journals, but attempts to find four compatible matches was not possible. Two big ends were tight on each and every journal, one failed to tighten up, tiny but noticeable gap between the halves of the big end. Now how tight should the big end be? Tightening up to indicated torque should not end up with it virtually solid, or would that be eased off by rotation under power and with lubrication? How do the experienced forumists judge the correct tightness of the bearings?