john milner Posted October 21, 2019 Share Posted October 21, 2019 I have been trying to tighten my crankshaft pulley to 205Nm but I could not get the wrench to click. I backed it off and the highest that I could get it to click was around 160Nm. It could be that the transmission is stopping me by soaking up the rest or it could be that my torque wrench is knackered. For reference the handbrake was on, in fifth gear and a plank of wood in front of each wheel. I was using enough force to get the car to start to ride up the planks. I tried again shoving a screwdriver in left side of the ring gear and it still would not click.I'll try again tomorrow when I will have an assistant to ensure the screwdriver in the ring gear is doing its job.Is there a DIY method for testing a torque wrench? Link to comment Share on other sites More sharing options...
Jonathan Kay Posted October 21, 2019 Share Posted October 21, 2019 Yes. Lots of YouTube videos, but here's a nice clear wikiHow.Which model and what's the nominal range?JonathanPS: Might you need to borrow one urgently, and where are you? Link to comment Share on other sites More sharing options...
john milner Posted October 22, 2019 Author Share Posted October 22, 2019 The make is Sealey Premier Line and the range is 42Nm to 210Nm. I did a cambelt change for the first time four years ago and tightening the pulley then was a lot easier than I thought it would be so I have reason to be surprised at the effort required this time.If I have to there is one I can borrow from family. Link to comment Share on other sites More sharing options...
SM25T Posted October 22, 2019 Share Posted October 22, 2019 I suspect you are not reaching the required torque as the crank is turning. You need a better lock in the flywheel teeth. I managed it with a big screwdriver. Link to comment Share on other sites More sharing options...
Tony Whitley Posted October 22, 2019 Share Posted October 22, 2019 I'll try again tomorrow when I will have an assistant to ensure the screwdriver in the ring gear is doing its job.This is the "assistant" I used. Link to comment Share on other sites More sharing options...
john milner Posted October 22, 2019 Author Share Posted October 22, 2019 Got there in the end. It was quickly apparent with my assistant (human) that the screwdriver that I tried yesterday was a bit too fat and blunt. A better fitting screwdriver and the wrench clicked easily so I must have way over tightened yesterday. I think it proves that brakes and chocks alone are not good enough to do the job accurately although they can get it tight enough. Link to comment Share on other sites More sharing options...
Bricol Posted October 23, 2019 Share Posted October 23, 2019 Plonk your assistant in the drivers seat with a foot hard down on the brake pedal next time - worked for me. Link to comment Share on other sites More sharing options...
SM25T Posted October 24, 2019 Share Posted October 24, 2019 Didn't work for us. Needed to jam the flywheel teeth. Link to comment Share on other sites More sharing options...
john milner Posted October 24, 2019 Author Share Posted October 24, 2019 I think it is easier to use a screwdriver. The assistant only needs a light touch to hold the screwdriver steady. It is harder getting in the driver's seat and more reliable.I am very surprised at how much muscle power the transmission, tyres etc. manages to soak up. I was able to move a half tonne car, in gear, brakes on and small chocks and the thing still would not click. With a screwdriver it was easy. Link to comment Share on other sites More sharing options...
Bricol Posted October 24, 2019 Share Posted October 24, 2019 Gear ratios thats all. You can do the same to vehicles a lot heavier than a seven. Link to comment Share on other sites More sharing options...
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