Elements of depreciation
1 - shock absorber;
2 - cover;
3 - support;
4 - upper spring support;
5 - nut (tightening torque with external hexagon piston rod 65 Nm, tightening torque with internal hexagon piston rod 45 Nm);
6 - protective cap;
7 - upper spring plate;
8 - plastic spring;
9 - spring;
10 - lower spring support;
11 - nut;
12 - bolt (only in the version for driving on bad roads);
14 - ring (for full piston rod);
15 - sealing ring;
16 - washer;
17 - washer;
18 - bolt.
Dismantling of amortization rack/removal and installation of the shock-absorber/spring
Attention: On the same axle, replace the spring struts only in pairs with exactly the same ones with BMW identification numbers. The number is on the counter.
Withdrawal
Remove the shock absorber.
To be able to remove the shock absorber, you need to compress the spring with a suitable compressor. Use a plastic pad to protect the surface of the spring.
Caution: Never remove the shock absorber until the spring has been removed.
Attention: It is necessary to install the compressor on the coils of the spring so that it securely wraps around them and cannot slip off the spring. The spring is compressed with great force, so you need to use only a reliable device. In no case do not tie the spring with wire - this is dangerous.
Loosen the fastening nut with a bent ring wrench, while holding the piston rod, depending on the design, either with a hexagon or ring wrench 11.
Attention: The nut is tightened with a strong torque, so if necessary, loosen it by hitting the wrench with a hammer.
Remove the puck.
Remove the support with sealing key and washer.
Remove the upper spring plate with support, as well as the spring, or remove the shock absorber from the spring.
Caution: If only the spring needs to be replaced, loosen it slowly. If only the shock absorber needs to be replaced, the spring remains compressed.
Remove the plastic spring, rubber boot and lower spring plate.
Installation
The new spring is coated with a protective composition against corrosion. Before installation, check the integrity of the coating and, if necessary, restore it in the right places.
Check the rubber boot, plastic spring and spring seats for damage and replace if necessary.
Insert the shock absorber with the lower spring plate, plastic spring and boot into the compressed spring.
Assemble the shock absorber according to the drawings. Make sure that the ends of the spring fit into the recesses of the upper and lower spring plates. Tighten the new self-locking nut a few turns.
Slowly release the spring until it enters the spring cups. Pay attention to the correct fit of the spring supports (rectangular notches).
Tighten the fastening nut to a torque of 65 Nm (if the piston rod has a recess for a hex key, then 45 Nm), while holding the piston rod. Workshops use a special set of wrenches to ensure the correct tightening torque.
Fully release the spring and remove the compressor.
Install the shock absorber.