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  29.März 2024 00:28:3

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 Thema: Leaf spring replacement procedure  (Gelesen 1190 mal)
Mo

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Leaf spring replacement procedure
« am: 30.Januar 2023 16:33:55 »
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The workshop manual says

"Load the vehicle until there is an angle of 90 degrees between the spring shackle and frame. Then tighten the spring shackle upper bolt. Load the vehicle further until the spring is flat and tighten up the remaining spring bolts."

Referring to the front springs on a C303, how do you "load the vehicle"?

Thanks
Maurice
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Mo

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Re:Leaf spring replacement procedure
« am: 31.Januar 2023 11:48:19 »
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Interestingly the military workshop manual is slightly different. Page 72:3 says (Google Translate):

"Check that all spring bolts that have been loosened are not tightened. Jack up the car under the axle. Load the car until a 90 degree angle is obtained between the spring hanger and the frame. Tighten the upper bolt of the spring hanger. Load the car further to a straight spring and tighten the remaining spring bolts. Tightening torque 140-150Nm (13-15kpm)."

So lifting the axle was correct smiley

The English workshop manual says you need 5900Nm force (=600Kg) to get a flat front spring. Of course the inherent weight of the vehicle contributes to that if it's jacked up but still, it's a lot of weight in a comparatively small space. However I'm not only wondering how to do it, but also why it's necessary?

My simplistic understanding is that if you tighten the bolts with the wheels off the ground, when you lower the vehicle it torques/twists the bushes. This at rest torque is then increased when the suspension is loaded, and it causes the bushes to fail prematurely. By tightening the bolts when the vehicle is on the ground you avoid the at rest torque.

So why does the manual say to tighten the bolts at maximum loading? Surely that will also introduce an at rest torque but in the opposite direction?  huh

Maurice
« Letzte Änderung: 31.Januar 2023 11:53:12 von Mo » Moderator benachrichtigen   Gespeichert
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