Prod­uct Test: Torque Wrenches

Cor­rect torque val­ues are the dif­fer­ence be­tween fail­ure and pro­longed suc­cess

Land Rover Monthly - - Contents -

Cor­rectly tight­ened fit­tings are crit­i­cal for re­li­a­bil­ity and safety, mak­ing these the main rea­sons for us­ing a torque wrench. En­sur­ing com­po­nents are cor­rectly fit­ted needs to be more spe­cific than tight­en­ing as far as you can and then a bit more. Equally, com­po­nents that are un­der-tight­ened, such as cylin­der heads, will pre­ma­turely fail – and with­out a torque wrench this is eas­ily done. For ex­am­ple, a fit­ted en­gine of­fer­ing re­sis­tance to your ratchet turns makes it eas­ier to tighten 90 lb ft cylin­der head nuts than a loose en­gine on a trol­ley or the floor.

Torque wrenches are avail­able in an ar­ray of drive socket sizes, mea­sur­ing scales and phys­i­cal size, so match­ing one or more to your needs de­pends on in­tended use. A one-off en­gine re­build is a dif­fer­ent dis­ci­pline to reg­u­lar sus­pen­sion work for off-road use, for ex­am­ple, or for fit­ting a va­ri­ety of wheel types in a pro­fes­sional en­vi­ron­ment.

All the wrenches tested are ISO 6789 com­pli­ant, mean­ing they are cal­i­brated for ac­cu­racy be­fore sale. A cer­tifi­cate is­sued with the wrench will give the cal­i­bra­tion re­sults you can ex­pect at dif­fer­ent set­tings across the torque ranges. This is im­por­tant be­cause it al­lows you to fine-tune the wrench to crit­i­cal set­tings if nec­es­sary. If your wrench use is con­fined to an an­nual ser­vice or one-off restora­tion, buy a wrench with the broad­est range pos­si­ble to match the torque val­ues pro­vided in a work­shop man­ual.

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.