Who calibrated your digital unit?
I never buy a clickable setting torque wrench. Like StarTech said, you must dial back to 0 when done. I just buy the old school beam style jobs that work for decades. Pick them up at garage sales or facetrash market place for cheap.
oldcodger
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Beam type wrenches work well for head bolts but when trying to torque a bolt in a tight place you can't get a view of the reading. To view the scale properly you need to view the scale from straight above it, not on an angle.
StarTech
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Tap Magic doesn't work very on aluminum. I have tried it then my machinist suggest the alcohol.
That is what happens when they make a product that accommodates too many options. Too many compromises. It does not work well at anything while claiming it can do everything.
StarTech
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A lot of the products out there makes a lot of promises with few realized. I got some Free All penetrating oil that failed on every stuck fastener. A total waste of my funds when a 50/50 Acetone and transmission mix beats it hands down.
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I recall the cast iron engine days of book specific head bolt torque values and "by the book" was the rule.
When aluminum heads and blocks came out, the game changed due to dissimilar metals and a high coefficient of friction. Steel bolts and aluminum components have different rates of expansion and contraction with changing temperatures.
To resolve issues many manufacturers switched over to angle torque settings and torque to yield one time use bolts. That was mainly critical on the automotive engine designs due to higher engine compressions and longevity.
On the small engine side, they mostly still relied on fixed torque settings, but all the head bolts required a very thin coat of lube to prevent excess friction during the bolt torque process.
The whole idea of properly torquing bolts is providing the proper bolt clamping force and gasket crush to ensure proper long-term sealing.
When aluminum heads and blocks came out, the game changed due to dissimilar metals and a high coefficient of friction. Steel bolts and aluminum components have different rates of expansion and contraction with changing temperatures.
To resolve issues many manufacturers switched over to angle torque settings and torque to yield one time use bolts. That was mainly critical on the automotive engine designs due to higher engine compressions and longevity.
On the small engine side, they mostly still relied on fixed torque settings, but all the head bolts required a very thin coat of lube to prevent excess friction during the bolt torque process.
The whole idea of properly torquing bolts is providing the proper bolt clamping force and gasket crush to ensure proper long-term sealing.
ILENGINE
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Or in the case of the old Kohler K-series it was recommended to replace the head bolts. The understanding was the bolts were designed to expand and contract with the aluminum, but were basically a one time torque to yield bolt.