rvwp Posted June 26, 2022 Report Share Posted June 26, 2022 Hi guys, I need to recheck my TR4A cylinder head torque after engine rebuild. Rather than remove the rocker shaft etc to access the nuts under the shaft, I'm sure I have seen a short flat adaptor spanner that will pass under the shaft and drop over the head nuts, 5/8unf one end and 1/2 inch square on the other to take the torque wrench. I know it's not that much trouble to remove the Rocker shaft and i would need to recheck the tappet clearances after re torque, but wondering if anyone knows of such a spanner, or have I imagined it! Rich Quote Link to post Share on other sites
Charlie D Posted June 26, 2022 Report Share Posted June 26, 2022 (edited) Rich, Google "crows foot wrench". May do the trick, but not sure. Charlie PS Just found this: https://www.tekton.com/blog/how-to-accurately-use-a-torque-wrench-with-a-crowfoot-wrench Edited June 26, 2022 by Charlie D Quote Link to post Share on other sites
rvwp Posted June 26, 2022 Author Report Share Posted June 26, 2022 OK I will have a look. Should have said 3/4 AF X 1/2inch square, not 5/8unf!! Rich Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 27, 2022 Report Share Posted June 27, 2022 Obstruction wrench Not sure the open end will stand up to the intended torque. Does not take long to remove the 4 nuts that hold the rocker shaft and you will have to check the tappets after torquing the head any way. Quote Link to post Share on other sites
Lebro Posted June 27, 2022 Report Share Posted June 27, 2022 +1 +1 Bob Quote Link to post Share on other sites
Motorsport Mickey Posted June 27, 2022 Report Share Posted June 27, 2022 (edited) Mechanic and engineers tool preference order. Single hex socket driving on the flats. Double hex socket driving on the corners. Ring spanner driving on the corners. Open ended spanner driving on the corners. . . . Obstruction wrench…Some hopeless piece of **** only used by plumbers….Lol. C’mon Rich, would you really use even an open ended spanner when you are putting 105 lb ft through it ? You can see the jaws spreading as the torque is applied ! Mick Richards Edited June 27, 2022 by Motorsport Mickey Quote Link to post Share on other sites
boxofbits Posted June 27, 2022 Report Share Posted June 27, 2022 42 minutes ago, Motorsport Mickey said: Mechanic and engineers tool preference order. Single helix socket driving on the flats. Double helix socket driving on the corners. Mick Richards I think you must mean ‘Hex’ or bi-Hexagonal socket Mick as opposed to Helix which normally refers to the twist as in a twist drill bit for instance, often being fast or slow helix? Kevin Quote Link to post Share on other sites
Motorsport Mickey Posted June 27, 2022 Report Share Posted June 27, 2022 (edited) 27 minutes ago, boxofbits said: I think you must mean ‘Hex’ or bi-Hexagonal socket Mick as opposed to Helix which normally refers to the twist as in a twist drill bit for instance, often being fast or slow helix? Kevin Thanks for the correction Kevin, yes Hex sockets. I’ve corrected my post. regards Mick Edited June 27, 2022 by Motorsport Mickey Quote Link to post Share on other sites
Dic Doretti Posted June 27, 2022 Report Share Posted June 27, 2022 I made this spanner/socket to remove and torque up the head nuts on a Ginetta G15/ Hillman Imp. It avoided disturbing the overhead camshaft. I made it out of an old socket and a ring spanner. Cheers Richard Quote Link to post Share on other sites
HSM Posted June 28, 2022 Report Share Posted June 28, 2022 Your Hillman Imp spanner is the same as the Churchill tool supplied to the agents Harvey Quote Link to post Share on other sites
ianc Posted June 28, 2022 Report Share Posted June 28, 2022 Clever, but I cannot imagine that the head nuts on a Hillman Imp, which has an alloy head, required the 105 lb.ft of torque which we have to apply to the good old TR 4 pot. I have a feeling that a variant of this clever tool might not cope on a TR. Ian Cornish Quote Link to post Share on other sites
boxofbits Posted June 28, 2022 Report Share Posted June 28, 2022 1 hour ago, HSM said: Your Hillman Imp spanner is the same as the Churchill tool supplied to the agents Harvey As per Harvey’s post this looks like the pukka tool for the Imp. Interesting one. https://www.hillmanimp.org/forum/workshop/s-special-tools/4236-rg-355-cylinder-head-bolt-wrench-access-cylinder-head-bolts-remove-not-cam-carrier Quote Link to post Share on other sites
HSM Posted June 28, 2022 Report Share Posted June 28, 2022 Ian Imp Sport 45 ft/lbs Harvey Quote Link to post Share on other sites
Andy Moltu Posted June 28, 2022 Report Share Posted June 28, 2022 It doesn't take long to pull the rockers off. You are going to need to check the tappet gaps after pullng the head down anyway so compared to the time to do that the 4 pedastel nuts are pretty quick to do. Quote Link to post Share on other sites
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