Tipidave Posted August 14, 2023 Report Share Posted August 14, 2023 Hi all i am about to replace the timing cover oil seal and wonder if anyone can confirm the crank nut size… does 1 7/16 inch sound correct? If so this is 36.5mm would a 37mm impact socket be to big? I am having difficulty getting hold of the imperial socket. Thanks in anticipation of replies david Link to comment Share on other sites More sharing options...
JohnD Posted August 14, 2023 Report Share Posted August 14, 2023 Always worth checking previous threads: John Link to comment Share on other sites More sharing options...
PeteH Posted August 14, 2023 Report Share Posted August 14, 2023 I had reason to go out to the Garage just now, and out of curiosity I measured the 13/60 Engine sat in the cradle, 1-13/16", (<47mm) Such that I went back and double checked. That IS one dirty big Nut!!!. I don`t think I even have a socket that big in my 3/4" socket set. Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted August 14, 2023 Report Share Posted August 14, 2023 The bigger engines are 1 13/16, but not the 1200 which is smaller. 1 7/16" sounds closer, it's not quite 1.5 inches. I'll confirm once I've finished burning my tea... Link to comment Share on other sites More sharing options...
JohnD Posted August 14, 2023 Report Share Posted August 14, 2023 It may interest some that 1 13/16" is exactly the same as the wheel nuts of a WW2 Willys Jeep! I know because that was how we changed the pulley on Mark Field's ADU 1B at Classic Le Mans in .... Oh, many years ago! John 1 Link to comment Share on other sites More sharing options...
PeteH Posted August 14, 2023 Report Share Posted August 14, 2023 27 minutes ago, JohnD said: It may interest some that 1 13/16" is exactly the same as the wheel nuts of a WW2 Willys Jeep! I know because that was how we changed the pulley on Mark Field's ADU 1B at Classic Le Mans in .... Oh, many years ago! John I havent actually Checked. But the Wheel nuts of my American R-V where not that big. And that was a BIG spanner job, around 1-1/2"AF, and a jack stand, and a 6ft(ish) length of Scaffold, Just to get the Bu**er`s undone. The wheel (nut) Torque, was 375lb/ft (officially). But there was 8 per wheel. Pete Link to comment Share on other sites More sharing options...
Tipidave Posted August 14, 2023 Author Report Share Posted August 14, 2023 (edited) So I guess the second part of my post is on my mind… if I am unable to get a 1 7/16 impact socket… would a 37mm be a satisfactory substitute? Would the .5mm oversize be significant when using an impact driver? Edited August 14, 2023 by Tipidave Link to comment Share on other sites More sharing options...
Sandy Gibson Posted August 15, 2023 Report Share Posted August 15, 2023 My 1296 mk3 Spitfire is 1 7/16” af. I’ve got the correct socket, it’s a 3/4” drive but I have an adaptor to suit. Link to comment Share on other sites More sharing options...
johny Posted August 15, 2023 Report Share Posted August 15, 2023 (edited) 8 hours ago, Tipidave said: So I guess the second part of my post is on my mind… if I am unable to get a 1 7/16 impact socket… would a 37mm be a satisfactory substitute? Would the .5mm oversize be significant when using an impact driver? Thatll be fine on that size of nut, not something youre doing every week👍 Edited August 15, 2023 by johny Link to comment Share on other sites More sharing options...
DanMi Posted August 15, 2023 Report Share Posted August 15, 2023 I have a 36mm which I believe is what I used sot 36 or 37 will be ok Link to comment Share on other sites More sharing options...
Tipidave Posted August 15, 2023 Author Report Share Posted August 15, 2023 Great… I will stop fretting and get on with ordering all the other bits that will inevitably need renewing 👍👍😀 Link to comment Share on other sites More sharing options...
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