The 75 and ZT Owners Club Forums - View Single Post - Penetrating Oil : Rusty Bolts on Rear Suspension Trailing Arm Brackets

MikeHurley · 21st August 2018, 21:59

Hi All,

Hopefully a few members will have had experience of dropping the trailing arms in order to refresh or renew Rear Suspension parts and will have been faced with rusty bolts as per the attached photos.

I am planning have most of the rear suspension serviced in a few weeks and want to get feedback from people who have faced or done this when the rust seems bad and there is a need to apply penetrating Oil in advance.

So the question is what is the best Penetrating Oil / Product you have used to remove similar bolts and how have you applied it in advance, spray once a few days in advance or every couple of days over say a week. Also is it possible to gain access to spray around the captive nuts on the non visible side of the trailing arm bracket.

This is feeling like mission impossible but I know the Bolts are of a very high quality steel and assume the captive nuts are likewise to the rust that it visible it just excessive surface rust (I hope).

Experiences and advice welcome as I am sure many more members are about to face this kind of maintenance in the relatively near future.Trailing Arm Bracket 1 .jpg

Trailing Arm Bracket 2 .jpg

Trailing Arm Bracket 3 .jpg

21st August 2018, 21:59	#1
MikeHurley Gets stuck in Rover 75 Saloon 2.5 V6 Join Date: Sep 2007 Location: London Posts: 659 Thanks: 129 Thanked 26 Times in 24 Posts	Penetrating Oil : Rusty Bolts on Rear Suspension Trailing Arm Brackets Hi All, Hopefully a few members will have had experience of dropping the trailing arms in order to refresh or renew Rear Suspension parts and will have been faced with rusty bolts as per the attached photos. I am planning have most of the rear suspension serviced in a few weeks and want to get feedback from people who have faced or done this when the rust seems bad and there is a need to apply penetrating Oil in advance. So the question is what is the best Penetrating Oil / Product you have used to remove similar bolts and how have you applied it in advance, spray once a few days in advance or every couple of days over say a week. Also is it possible to gain access to spray around the captive nuts on the non visible side of the trailing arm bracket. This is feeling like mission impossible but I know the Bolts are of a very high quality steel and assume the captive nuts are likewise to the rust that it visible it just excessive surface rust (I hope). Experiences and advice welcome as I am sure many more members are about to face this kind of maintenance in the relatively near future.Trailing Arm Bracket 1 .jpg Trailing Arm Bracket 2 .jpg Trailing Arm Bracket 3 .jpg __________________ To do list: Aux Drive Belt ....... Sept 2017 Kaiser Alumium Stat Housing ....Jan 2017 Rear o/s wheel bearing set changed.....Aug 2014 Cam & Aux Belts...May 2014 Tazu Inner tie rod ends...May 2014 Need Timing Belts changed...done April 2014 Front Shocks and Strut Bearings ....done Mar 2014 Polybushes to Wishbone Arms.....done Mar 2014 Handbrake compensator changed...done Oct 2013 Exhaust Back Box a.......done 16/8/13 Quality Front Drop Links...done 16/8/13 Rear Springs ..done 16/8/13