philb Posted August 29, 2018 Share Posted August 29, 2018 Could someone please tell me the torque settings for the B40 big-end nuts, main bearing cap nuts and the flywheel stud nuts? As far as we can see (maybe not far enough?) the manual does not mention them. Cheers, Phil Quote Link to comment Share on other sites More sharing options...
fv1609 Posted August 29, 2018 Share Posted August 29, 2018 Phil but what manual are you looking in? EMER POWER S 528 Inspection Standards B40 Crankshaft main bearing nuts High 425 lb in Low 400 lb in It also lists the torques for 3/8 & 5/16 set screws if you want them Flywheel bolts High 475 lb in Low 450 lb in I remember once snapping a stud on a flywheel forgetting it was inches not pounds! Quote Link to comment Share on other sites More sharing options...
philb Posted August 29, 2018 Author Share Posted August 29, 2018 Thanks Clive. Any mention of the big end figures? The manual we have is a disorganised reprint of a cocktail of EMERs, very descriptive but short on useful info. You seriously tried to apply 450 ft lbs? Report to the headmaster's office for a good whacking. Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted August 29, 2018 Share Posted August 29, 2018 32 minutes ago, philb said: Thanks Clive. Any mention of the big end figures? Hi Phil, You have to measure the length of the big end bolts to achieve the correct tightness. First measure the bolt then tighten until the length increases by 0.006" to 0.009", then fit the split pins in the nut. You can measure the bolts insitu with a caliper. regards, Richard Quote Link to comment Share on other sites More sharing options...
philb Posted August 29, 2018 Author Share Posted August 29, 2018 Thanks Richard. That's the first time I've come across a sensible way to accurately pre-stress bolts in small engine construction. Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted August 29, 2018 Share Posted August 29, 2018 17 minutes ago, philb said: Thanks Richard. That's the first time I've come across a sensible way to accurately pre-stress bolts in small engine construction. Phil, You gotta love Rolls engines! The REME Inspection Standards for the B40 engine, dated 1953, has no mention of torques, just tighten big end nuts using a 6" Tommy bar of 3% Nickel Steel .................... Quote Link to comment Share on other sites More sharing options...
philb Posted August 29, 2018 Author Share Posted August 29, 2018 but what size Ape do you attach to the Tommy bar? Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted August 29, 2018 Share Posted August 29, 2018 Stick to the bolt stretch method, it came from a much later EMER instruction - No Apes required !!! Quote Link to comment Share on other sites More sharing options...
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