Z320 Posted October 2, 2023 Report Share Posted October 2, 2023 (edited) Good morning all, I want to make a special pulley for my TR4A. With a number of them on my workbench, all silghtly diffent, I have doubts about the correct depth. Did anybody out there made a sketch, or have a not used original pulley to confirm "?" is 40 mm, please? Or what ever is correct. Thanks in advance, Marco Edited October 5, 2023 by Z320 Quote Link to post Share on other sites
Lebro Posted October 2, 2023 Report Share Posted October 2, 2023 will check later, I should have an original wide belt pulley in my shed Bob Quote Link to post Share on other sites
Lebro Posted October 2, 2023 Report Share Posted October 2, 2023 I then measured from inside surface to left hand edge, then left hand edge to center of groove. One minus the other gave 42mm. Bob Quote Link to post Share on other sites
Z320 Posted October 2, 2023 Author Report Share Posted October 2, 2023 (edited) Hi Bob, thank you very much! I don't want to stress your kindness too much, but could you please measure like this: With maybe a differen result, of course Ciao, Marco Edited October 2, 2023 by Z320 Quote Link to post Share on other sites
BlueTR3A-5EKT Posted October 4, 2023 Report Share Posted October 4, 2023 Sorry, late to the game on this. My dimensional checks on a used pulley reveal the centre of the belt groove is 41.35mm back from the internal abutment face for the water pump bearings. v groove is 18.3 mm wide using milling edge finder and digital mill scales. So agree with your measurements Marco. Quote Link to post Share on other sites
Lebro Posted October 4, 2023 Report Share Posted October 4, 2023 41 minutes ago, BlueTR3A-5EKT said: Sorry, late to the game on this. My dimensional checks on a used pulley reveal the centre of the belt groove is 41.35mm back from the internal abutment face for the water pump bearings. v groove is 18.3 mm wide using milling edge finder and digital mill scales. So agree with your measurements Marco. So, my 42mm wasn't far out then ! Quote Link to post Share on other sites
BlueTR3A-5EKT Posted October 4, 2023 Report Share Posted October 4, 2023 (edited) Let’s face it 42 is the answer to the ultimate question. Plus or minus 40 thou. Works for me when you consider the possible gasket thickness Edited October 4, 2023 by BlueTR3A-5EKT Quote Link to post Share on other sites
Z320 Posted October 4, 2023 Author Report Share Posted October 4, 2023 Hi Peter, you are welcome when ever you join, and thank you for your effort! What is strange: a v groove 18 mm for a belt typ 20? But this is also the case on 3 old pulleys I have. Yesterday I had an idea, and this old engine I bought years ago (wife: "are you shure we need this") is a joy! Floor and engine leveled, parallel to the brick wall, laser 90° to the wall, this is what i measured: 44.5 mm - 3.9 mm back to the inner ring of the bearing = 40.6 mm. I think 41 mm is a good determination for me, I can take some 1/10 off or shim 1 mm. And +/- 1 mm should not be a problem? Ciao e mille garzie, Marco Quote Link to post Share on other sites
BlueTR3A-5EKT Posted October 5, 2023 Report Share Posted October 5, 2023 (edited) I like the use of the laser level. Very creative. Bet you did not think of using it that way when you picked it up in Lidl….just in case. Edited October 5, 2023 by BlueTR3A-5EKT Quote Link to post Share on other sites
Z320 Posted October 6, 2023 Author Report Share Posted October 6, 2023 I will tell my business partner later this morning. It‘s his BOSCH laser, I borrow it when ever I need it. Indeed he did not think of this usage when he bought it 25 years ago to check the craftsman building his house. Quote Link to post Share on other sites
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