Mercury MerCruiser Quicksilver Pinion Stud 8M0113182 | 7/16-20 Stainless Steel
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Mercury MerCruiser Quicksilver Pinion Stud 8M0113182
- Part Number: 8M0113182 (service format: 43-8M0113182)
- Brand: Mercury Marine / MerCruiser / Quicksilver
- Official Product Type: Pinion Stud
- Material: Stainless steel
- Thread: 7/16-20
- Quantity: 1
- GTIN: 745061324572
- Supersedes: 818381, 8183811, 8183812 (confirmed Mercury supersession chain)
- Replaced By: No further confirmed supersession — 8M0113182 is current
- System: Accessory drive / idler-pulley assembly
What This Part Does
The Mercury Marine 8M0113182 is a genuine OEM stainless-steel pinion stud used as mounting hardware within the idler-pulley and accessory-belt drive assembly on selected MerCruiser gasoline engines. Despite the catalog name “Pinion Stud,” this part is shown in engine diagrams alongside the idler pulley, bushing, and retaining nut — not in the sterndrive gearcase. It is the current replacement for earlier stud numbers 818381, 8183811, and 8183812.
Compatible Applications
- 420 GM 454 V8
- 425 GM 454 V8
- 465 GM 502 V8
- 500 GM 502 V8
- 525 SC GM 454 V8
- 454 EFI Ski
- 7.4L MIE
- 7.4L MIE MPI
- 8.2L MIE
- 454 MAG Bravo
- 502 MAG Bravo
- Later MerCruiser accessory-drive assemblies using idler pulleys 807757T or 864625T
Confirm the engine model, serial number, and accessory-drive parts diagram before ordering. Mercury used several belt and idler-pulley configurations across big-block engine families, and the correct stud depends on the installed bracket and pulley setup.
Superseded Part Numbers
Confirmed Mercury supersession chain: 818381 → 8M0113182, 8183811 → 8M0113182, 8183812 → 8M0113182.
If your parts diagram or existing hardware shows any of these earlier numbers, 8M0113182 is the current service replacement.
When to Replace This Stud
- Threads are damaged, stripped, or corroded
- The stud is bent or distorted
- The idler pulley or bushing shows excessive movement caused by loose or damaged mounting hardware
- The stud is damaged during accessory-drive service or pulley removal
Installation Notes
- Inspect the idler-pulley bushing and bearing before reassembly
- Check the retaining nut and washer condition
- Confirm the correct belt routing before final assembly
- Tighten to Mercury service specifications
- Verify the pulley rotates freely without side play after assembly
Related Components
This stud is typically serviced alongside the following components in the accessory-drive assembly:
- 865193 — Bushing
- 859135 — Retaining nut
- 807757T / 864625T — Idler pulley (application dependent)
- 20084 — Washer (selected configurations)
Technical FAQ
Is this a gearcase or sterndrive pinion stud?
No. Despite the Mercury catalog name “Pinion Stud,” 8M0113182 is shown in engine accessory-drive diagrams mounting the idler pulley and belt system — not in the sterndrive gearcase. Do not use it as a gearcase component.
Does 8M0113182 replace 818381?
Yes. The confirmed Mercury supersession chain is 818381 / 8183811 / 8183812 → 8M0113182. All three earlier numbers are replaced by the current 8M0113182.
What thread specification is this stud?
7/16-20. Confirm this against the existing stud and assembly before ordering, as Mercury accessory-drive assemblies use several different hardware specifications across engine generations.
Should I replace other components when replacing this stud?
It is good practice to inspect the idler-pulley bushing (865193) and retaining nut (859135) at the same time. A worn bushing can cause belt misalignment and accelerated wear even after the stud is replaced.
Related Parts
- Mercury MerCruiser Pinion Nut 11-35921
- Mercury MerCruiser Quicksilver Gear Housing Shim Set 8M0063267
- Mercury Gearcase Shim Set 15-32563A1
Parts Desk Insights
The most important thing to know about 8M0113182 is its actual location in the engine: it mounts the idler pulley in the front accessory-drive system, not in the sterndrive or gearcase. Customers occasionally look for it in the wrong diagram because of the “Pinion Stud” name. When ordering, match by engine model and serial number first, then confirm against the accessory-drive or serpentine-belt diagram. If you are replacing this stud due to idler-pulley wobble or belt alignment issues, always inspect the bushing and retaining nut at the same time — these wear together and are inexpensive to replace as a set.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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Item must be in new, unused condition
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Important:
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