Hey guys,
I'm a little troubled. I've noticed in the last little bit I'm getting a knocking sounds, apparently from the right rear, like I did before I did the subframe bushings.
When I first did them about a month ago, that knocking sound had gone away.
The only thing I can think of that I may have done wrong was the tightening of the 22mm nut for the subframe. I couldn't find a torque spec in Bentley, and I didn't notice the one at the bottom of the RTSAuto article on the bushings - 70 ft lbs. In the article he says: "Subframe to body (Big bolts) – 94.9nm (70ft lb) <<< I found this torque to be fairly low, most of the community agrees to tighten the shit out of the nut with a normal size breaker bar (like you would a lug nut)".
Soooo, I talked to my buddy who was helping me. He does machine assembly, and he said according to torque specs, a nut that size could be torqued as high as 170 ft. lbs. I tightened it as far as I could manage with my big 250 ft lb capable Husky torque wrench, but didn't make it that far. I'm guessing I'm somewhere between 100-150 ft. lbs. I haven't had a chance to check it.
I've taken a look at the bushings while I had the car on ramps, and things looked ok from that vantage. I haven't had a chance to suspend the car, leaving the subframe in air yet.
I'm a bit miffed that the knocking sound is back and I'll be really annoyed if something went wrong with the bushings. I know we didn't damage them during the install into the frame - we'd used a mallet, soapy water, and had cleaned the subframe holes well with a wire brush, and they fit in beautifully with a few rubber mallet whacks.
Any suggestions here?
I'm a little troubled. I've noticed in the last little bit I'm getting a knocking sounds, apparently from the right rear, like I did before I did the subframe bushings.
When I first did them about a month ago, that knocking sound had gone away.
The only thing I can think of that I may have done wrong was the tightening of the 22mm nut for the subframe. I couldn't find a torque spec in Bentley, and I didn't notice the one at the bottom of the RTSAuto article on the bushings - 70 ft lbs. In the article he says: "Subframe to body (Big bolts) – 94.9nm (70ft lb) <<< I found this torque to be fairly low, most of the community agrees to tighten the shit out of the nut with a normal size breaker bar (like you would a lug nut)".
Soooo, I talked to my buddy who was helping me. He does machine assembly, and he said according to torque specs, a nut that size could be torqued as high as 170 ft. lbs. I tightened it as far as I could manage with my big 250 ft lb capable Husky torque wrench, but didn't make it that far. I'm guessing I'm somewhere between 100-150 ft. lbs. I haven't had a chance to check it.
I've taken a look at the bushings while I had the car on ramps, and things looked ok from that vantage. I haven't had a chance to suspend the car, leaving the subframe in air yet.
I'm a bit miffed that the knocking sound is back and I'll be really annoyed if something went wrong with the bushings. I know we didn't damage them during the install into the frame - we'd used a mallet, soapy water, and had cleaned the subframe holes well with a wire brush, and they fit in beautifully with a few rubber mallet whacks.
Any suggestions here?
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