$4.00
The Johnson/Evinrude Crankcase to Cylinder Screw 0308747 used on a wide range of OMC production outboards and on the SST-45 / Formula Light powerhead.
2 Bolts are included to secure the crankcase to the cylinder assembly and is used alongside other crankcase hardware to maintain proper clamping and alignment of the powerhead.
Ideal for powerhead rebuilding, restoration, or replacing corroded, damaged, rounded, or missing original hardware.
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The Johnson/Evinrude Screw is a crankcase to cylinder bolt set of 2 bolts used on many OMC outboard powerheads.
Unlike some SST-45-specific components, 308747 was also used extensively on standard production Johnson/Evinrude engines, including numerous 2-cylinder outboards.
Its primary purpose in these applications is to help secure the crankcase to the cylinder assembly and maintain proper clamping of the powerhead.
OMC used 308747 for many years on production Johnson/Evinrude engines.
It appears in cylinder and crankcase assemblies on numerous models, including select:
and other OMC applications depending on model year and engine family.
On many production 2-cylinder engines, 2 bolts are used in the crankcase to cylinder assembly.
Because OMC hardware was frequently shared across different engines, always verify the part number and quantity for your specific model before ordering.
The SST-45 / Formula Light powerhead also uses 308747 as part of the crankcase to cylinder fastening system.
For the SST-45 configuration:
These two screws work together with the other crankcase fasteners, including the 308742 and 308752 bolts, to securely clamp the powerhead assembly together.
The 0308747, 0308742 and 0308752 are all identified as crankcase to cylinder screws on applicable Johnson/Evinrude engines, but they are not the same fastener.
On the SST-45 powerhead:
This is why it is important to match the correct bolts to its position rather than assuming all of the crankcase fasteners are identical.
The crankcase and cylinder assembly must remain securely clamped together to maintain proper internal alignment and sealing.
The 0308747 bolt help provide the clamping force needed to maintain:
A damaged or incorrect fastener can make proper assembly more difficult and may affect the integrity of the crankcase joint.
Inspect the bolts whenever the powerhead is disassembled.
Replacement should be considered if you find:
Older saltwater engines deserve especially close inspection because corrosion can affect both the fastener and the threaded mounting hole.
Before installing the crankcase hardware:
Do not substitute a similar looking bolt unless its dimensions and application are confirmed.
At Liquid Revolutions, we pay close attention to the different crankcase fasteners during SST-45 powerhead assembly because the bolts are not all interchangeable simply because they perform a similar job.
The SST-45 uses two 308747 screws in the crankcase-to-cylinder assembly.
Keeping the correct hardware in the correct location is a simple but important part of building a reliable race powerhead.
The same 308747 screw is also useful for owners rebuilding standard Johnson/Evinrude engines, making it a good example of a production OMC part that carries directly into the SST-45 racing platform.
| Weight | 0.5 lbs |
|---|---|
| Dimensions | 4 × 2 × 2 in |
