Description
Johnson/Evinrude Water Passage Cover Bolt Set 0302288
The Johnson/Evinrude 302288 Screw is used to secure the water passage cover to the cylinder and crankcase assembly on select OMC outboard engines.
This listing includes a complete set of 12 bolts for applications using the 325308 style water passage cover.
Stock Johnson/Evinrude Applications
Part number 302288 / 0302288 is used on a number of standard Johnson/Evinrude 2-cylinder outboards.
Depending on model and year, it may be found on select:
- 35 HP
- 40 HP
- 45 HP
- 48 HP
- 50 HP
- 55 HP
- 60 HP
applications using the same style of water passage cover.
For standard production engines, always verify the exact model and required bolt quantity before ordering, since OMC reused the same fastener in different engine families and locations.
SST-45 / Formula Light Application
The SST-45 / Formula Light powerhead also uses the 302288 bolt to secure the water passage cover.
This 12-piece set provides a complete replacement set for that cover assembly.
Related SST-45 cooling-system parts include:
- 302288 – Water Passage Cover Bolts
- 325308 – Water Passage Cover
- 325211 – Water Passage Gasket
- 333105 – Drain Elbow
These components work together to route and contain cooling water through the upper powerhead.
Why Replace the Complete Set?
During disassembly, it is common to find the original cover bolts in mixed condition.
Some may have:
- Corroded threads
- Rounded heads
- Pitting
- Damaged threads
- Evidence of over-tightening
- Different replacement hardware mixed in
- Unknown service history
Replacing all 12 at once helps provide a matching set and removes questionable hardware from the cooling-system assembly.
Why Even Clamping Matters
The water passage cover must clamp evenly against the gasket and cylinder/crankcase surface.
Uneven clamping can contribute to:
- Water leaks
- Poor gasket compression
- Cover distortion
- Repeat gasket failure
- Cooling-water loss
Using a complete matching set of bolts helps make the final assembly cleaner and more consistent.
Common Reasons to Replace Bolts
Replacement should be considered when:
- Bolt heads are rounded
- Threads are corroded
- Bolts are bent
- Threads are damaged
- Fasteners are heavily pitted
- Original bolts are missing
- Hardware is mismatched
- The cover has been removed repeatedly
- A powerhead is being restored or rebuilt
Saltwater engines deserve especially close inspection because corrosion can affect both the bolt and the threaded hole.
Installation & Service Tips
Before installing the cover:
- Remove all old gasket material
- Clean the mating surfaces
- Inspect the 325308 cover for corrosion or warpage
- Clean the threaded holes
- Inspect the new bolts before installation
- Install a new 325211 gasket
- Tighten the bolts evenly
- Follow the proper tightening sequence
- Use the correct torque specification for the engine
Do not over-tighten the bolts into the aluminum cylinder/crankcase assembly.
Key Features & Benefits
- Complete 12-Piece Set – Includes all 12 water passage cover bolts
- Secures Cover – Correct hardware for applicable water passage cover assemblies
- Production OMC Application – Used on select standard Johnson/Evinrude outboards
- SST-45 / Formula Light Application – Complete cover bolt set for the race powerhead
- Ideal for Rebuilds – Useful during cooling-system or powerhead service
- Eliminates Mixed Hardware – Replaces corroded, damaged, or mismatched original bolts
Liquid Revolutions Racing Experience
At Liquid Revolutions, we prefer replacing cover hardware as a complete set rather than mixing old and new fasteners.
On an SST-45 engine, consistent cooling-system sealing is especially important because the engine spends long periods operating at high RPM.
A new gasket can only do its job if the cover is flat and the bolts provide even clamping.
Providing all 12 of the 302288 bolts as one complete set makes the repair easier and helps ensure the water passage cover goes back together with matching hardware throughout.
For SST-45 / Formula Light applications, this provides the complete set for the water passage cover assembly.
For stock Johnson/Evinrude engines, verify the exact engine model and parts diagram to confirm the same 12-bolt configuration.

