DB 990

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DB 990

Post by thedoctor » Sun Sep 25, 2016 1:00 am

Replacing the fuel lift pump and push pin. Unable to remove the push pin, it will only come out about 2/3 of the way. Have tried pulling it out with vise grips with no luck. Have used PB penetrating oil on it with no luck. Acts as if the pin is flared internally. Any suggestion on how to remove this would be appreciated.

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RE: DB 990

Post by ollek » Sun Sep 25, 2016 8:01 am

The pin is flared at the inner end as you suggest. This happens when the camshaft rubs at the end of the pin and the pin wears and the end gets a flare. The only way to get the pin out is to use force so that the thin flare is removed. The pin is not sticking in the bore and penetrating oil will not help. Clamp the pin with the vice grips and use small crow bar to pull the pin out. Knocking on the crow bar will help as this creates strikes on the flare on the end of pin.

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Post by DB780 » Sun Sep 25, 2016 8:18 am

You could also using a slide hammer. Weld a suitable sized nut or bolt depending what is on the end of the slide hammer, that should 'shock' it out.

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Post by case-ih1594 » Sun Sep 25, 2016 8:53 am

I know it's a bit drastic, but if it seemed to be absolutely stuck, an option may be to remove the sump pan and have a look up with a torch to see how flared the pin is. It would be annoying to use such force as to damage the casting - which is probably unlikely, but probably possible. I think you can see the pin from the inside.

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