Blocked DPF

Car Mechanics (UK) - - Tales From The Workshop -

Com­plain­ing that his BMW 520d was emit­ting a con­stant sound of rush­ing air, the owner was sur­prised to dis­cover that the prob­lem was down to a blocked diesel par­tic­u­late fil­ter (DPF). The rush of air was the sound of the ex­haust gases fight­ing their way out via a small leak in the front flexi-pipe. The unit had long since passed the stage where a re­gen­er­a­tion would have helped and re­place­ment was go­ing to be the only op­tion.

In the­ory, this looked like a quick and easy task. Bolted into place with four nuts and bolts at the square flange on either end of the unit, it only needed the bolts to be un­done and the DPF to be dropped out. But the ef­fects of rust had been at work, so the nuts re­fused to come un­done and the bolts were stuck fast in the holes, al­though the use of a grinder and an air saw helped ease the job a lit­tle.

Once the new unit was fit­ted, the sound of rush­ing air was no longer au­di­ble and the ve­hi­cle’s per­for­mance was also in­creased.

Once the DPF has been re­moved, the dif­fer­ence be­tween the new and old fil­ters is ob­vi­ous.

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