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YOUR RESEARCHRusted Motor Mounts ... Heat or impact ?
Leading reported evidence
Clean tb
Performed · outcome unconfirmed
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Performed · outcome unconfirmed · Original poster
Not a total loss, cleaned TB, replaced drive belt etc.
Leading evidence: 'Clean tb' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean tb' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Not a total loss, cleaned TB, replaced drive belt etc.
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Suggestion · Original poster
On my 03 C4S I was attempting to replace the motor mounts.
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Suggestion
I would steer clear from using heat but an impact gun...why not.
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6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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So... On my 03 C4S I was attempting to replace the motor mounts. Similar symptoms as others, vibration etc.
got the car up on stands and jack, however I'm unable to loosen the 18mm nuts Rusted pretty good, both of them. I tried some gentle heat but then thought about it and stopped.
I've soaked them pretty good with pbblaster and will try again tomorrow.
Not a total loss, cleaned TB, replaced drive belt etc.
Question: suggestions on how to remove the rusted nuts ? Small torch for heat ok ? Impact wrench ?
I have honestly never heard of a rusty mount. I would steer clear from using heat but an impact gun...why not. If you can get a cut off tool up you could cut the thing off. Good luck!
Try again as you say tomorrow, then blast it again as often as possible. If the actual nut is still intact and not rusted away, it will give eventually. Even try it clockwise a smidgers. That may loosen it up. Get a breaker bar on it. I think it's 63pound/foot. I just remembered something when I changed mine recently. When I was waiting for them to be delivered, I doused mine a few times and was damned if they would turn until I give it the 63 lb/ foot with the torsion bar and I heard a loud short squeal. That told me they had moved. They squealed more until a full turn was gained. So don't give up. Keep dousing them with PB blaster and they will eventually give. If they do not and break, nothing is lost. Loosen the top ones and buy another nut for the new ones. Make sure that you have taken up the weight of the engine on the floor jack. Good luck.
If the bottom nut does not come out, the rod/pin will eventually unscrew from the mount itself.
It happened to me on the passenger side. I had to remove the bottom nut from the rod in a vise, which worked out well enough. Good luck!
Thanks for the input guys. Outcome update. One bolt was so rusted I had to replace it.
Previously this baby lived in New England so many of the undercarriage bolts are corroded.
I did not need the full arsenal of weapons for an assault, heat etc.. another overnight PBlaster soak and then the 1/2 inch pry bar and pipe worked well.
A few days of driving now and it was definitely needed. Her big *ss does not jiggle nearly as much, traffic lateral movements are excellent and yes all the other benefits too: no seat vibration, crisper shifting etc.
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