Steering Rack to Subframe Bolts - Alfa Romeo Forum
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Steering Rack to Subframe Bolts

Is there a good reason (in terms of engineering practice) why these bolts have no drainage slot in their crush tubes?

I dismantled two 147 subframes yesterday and both had good evidence of water/moisture entrapment in these tubes, causing noticeable corrosion to the bolts. The subframe to chassis rail crush tubes have drainage slots and no buildup of corrosion.

EDIT: I thought "Bugger this for a lark" and ground small slots into the tubes, at the trailing edge. See attached image for the approach taken. Liberal copper grease application to entire bolt was also a part of my fix.
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File Type: jpg Subframe_Drain_Slot_sml.jpg (78.4 KB, 5 views)

Last edited by addo; 3 Weeks Ago at 10:31.
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(Post Link) post #2 of 2 Old 2 Weeks Ago
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Perhaps it was thought that the aluminium rack would seal the top of the tubes, while the steel chassis rail wouldn't?
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bolts , rack , steering , subframe

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