Mercury Quicksilver Flo-Torq II Drive Sleeve 835290Q1 | Propeller Hub Replacement Sleeve
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Mercury / Quicksilver OEM Flo-Torq II Drive Sleeve — Part No. 835290Q1
| Part Number | 835290Q1 |
|---|---|
| Brand | Mercury Marine / Quicksilver |
| Product Type | Propeller Hub Drive Sleeve |
| Material | High-strength Delrin plastic |
| System | Flo-Torq II Propeller Hub |
| Sold As | Individually (sleeve only) |
About This Part
The 835290Q1 is a genuine Mercury Marine / Quicksilver OEM Flo-Torq II plastic drive sleeve — the primary shock-absorbing component inside the Flo-Torq II propeller hub system. The sleeve fits between the propeller bore and the hub assembly, transferring engine torque to the propeller while allowing the propeller to slip momentarily on impact, which protects the gearcase, prop shaft, and driveshaft from sudden shock loads.
This listing is for the sleeve only. If you need the complete hub assembly including the forward thrust washer, aft adapter, spacer, nut, and cotter pin, order the appropriate complete Flo-Torq II hub kit for your engine (see Related Products below).
Compatible Applications
The 835290Q1 drive sleeve is included in multiple Flo-Torq II hub kits and fits outboards where those kits are specified. Confirm the correct hub kit for your engine and propeller application before ordering the sleeve alone.
- Mercury outboards using the Flo-Torq II hub system — confirm by engine model, serial number, and propeller application chart
- Included as a component in hub kit 835274Q1 (Yamaha 150–300 HP 4-stroke & VMAX SHO)
- Included as a component in hub kit 835257K1 (Mercury & Mariner outboards)
- Included as a component in hub kit 835257K6 (Mercury & Mariner outboards)
- Mercury Verado outboards using the Flo-Torq II system — confirm by engine serial number
Note: The 835290Q1 is the sleeve component shared across multiple Flo-Torq II hub configurations. If you are replacing the sleeve after a strike event, confirm the rest of the hub kit components are also in serviceable condition before reassembly.
When to Replace
- After any propeller strike — inspect the sleeve for cracking, splitting, or deformation even if damage is not immediately visible
- Propeller slipping under load at normal cruise or WOT RPM (worn or fatigued sleeve)
- Visible cracking, splitting, chipping, or distortion of the sleeve body
- Sleeve spins freely inside the propeller bore (loss of drive)
- Propeller replacement where the existing sleeve is aged or worn
- Any time the hub kit is disassembled and the sleeve shows wear beyond acceptable limits
Installation Notes
- This sleeve is a component of the Flo-Torq II hub system — install with the correct matching hub kit for your engine
- Inspect the propeller bore for wear, corrosion, or deformation before fitting the new sleeve
- Inspect the propeller shaft splines for wear or damage
- Seat the sleeve fully and squarely into the propeller bore before assembling the remaining hub components
- Assemble the complete hub kit in the correct sequence: forward thrust washer → drive sleeve → aft adapter → spacer → propeller nut → cotter pin
- Torque the propeller nut to specification per the Mercury service manual for your engine
- Always fit a new cotter pin — never reuse the old one
- Check the propeller after initial operation
Technical FAQ
Can I replace just the sleeve, or do I need the complete hub kit?
If only the sleeve is damaged and all other hub components (thrust washer, aft adapter, spacer, nut) are in good condition, replacing the sleeve alone is a cost-effective repair. However, after a significant propeller strike it is good practice to inspect the entire hub assembly and replace any component showing wear or deformation.
Why does the drive sleeve crack or fail?
The sleeve is designed as a sacrificial component — it absorbs impact energy that would otherwise be transmitted to the gearcase. Cracking or splitting after a strike is the sleeve doing its job correctly. A sleeve that slips without any strike event has usually fatigued from age, heat cycling, or sustained overloading.
Related Products
- Mercury Quicksilver Flo-Torq II Hub Kit 835274Q1 — complete Flo-Torq II hub kit for Yamaha 150–300 HP & VMAX SHO (includes this sleeve)
- Mercury Quicksilver Flo-Torq II Hub Kit 835257K1 — complete Flo-Torq II hub kit for Mercury & Mariner outboards (includes this sleeve)
- Mercury Quicksilver Flo-Torq II Hub Kit 835257K6 — complete Flo-Torq II hub kit, K6 variant (includes this sleeve)
- Mercury MerCruiser Flo-Torq SSR Hub 8M0101602 — SSR hub for MerCruiser sterndrive applications
- Mercury MerCruiser Flo-Torq SSR HD Hub 8M0101601 — SSR HD heavy-duty hub
- Mercury MerCruiser Quicksilver Thrust Washer 835467Q01 — thrust washer for propeller hub assemblies
Parts Desk Insights
The 835290Q1 is the most commonly replaced individual Flo-Torq II component — it’s the part that takes the hit when you strike something. The most common scenario we see is a customer who hits a sandbar or debris, pulls the propeller, and finds the prop looks fine but the boat is slipping badly at cruise RPM afterward. That’s almost always a fatigued or split sleeve. The sleeve can crack internally without obvious visible damage, so any time there’s been a hard strike, pull the hub apart and inspect it. If you’re going to put a new propeller on anyway, it makes sense to fit a fresh sleeve at the same time rather than risk losing drive on the water with a new prop.
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
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.