2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

What goes in this hole?

Old May 29, 2026 | 10:30 PM
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From: Independence Mo
What goes in this hole?

Hey folks,
quick question for one of my projects. What fastener goes in this lower hole on the front cover, down by the omp? Looking for sizes, threads, etc.



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Old May 30, 2026 | 09:07 AM
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From: Germany
Pretty sure thats where the air pump attaches. If you removed that, I would recommend to install the bracket anyway so the bolt help secure the water pump.
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Old May 30, 2026 | 09:50 AM
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From: Independence Mo
You are correct. Looking for the size of that fastener.
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Old May 30, 2026 | 09:59 AM
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From: https://www2.mazda.com/en/100th/
for an NA it looks like an M8x1.25x20, 9979-40-820 to be exact
if its a US turbo, i think it just holds a little stay for the metering lines, and its the same but 12mm long, 9979-40-812
the JDM cars have a different setup, and i think its a 65mm? 9979-40-865?
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