Description
Stainless Steel 304 Alloy Fuel Injector Sleeves
Fits 1994.5-2003 7.3L Powerstroke Diesel Engines
PN – SWF-9F538-7.3SS
– STAINLESS STEEL 304 ALLOY OE STOCK REPLACEMENT –
– 200% STRONGER THAN OEM BRASS SLEEVES –
- Includes 8 Injector Cups
**Using the Correct Sealant: Loctite 620 Retaining Compound
For stainless steel injector sleeves, Loctite 620 High-Temperature Retaining Compound is strongly recommended.
Why Loctite 620?
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✔ Designed specifically for cylindrical press-fit assemblies
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✔ Rated for high-temperature diesel engine environments
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✔ Excellent resistance to fuel, coolant, and oil
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✔ Prevents sleeve movement under heat cycling
*Standard thread locker or RTV silicone is NOT acceptable and will fail.
Proper Application of Loctite 620
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Apply a thin, even coat of Loctite 620 to:
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The outer surface of the injector sleeve
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The injector bore (light coat only)
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Do not over-apply — excess compound can hydraulic-lock the sleeve during installation
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Install the sleeve immediately after application
3. Correct Sleeve Installation
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Use a proper injector cup installation tool to ensure the sleeve is pressed in straight and to the correct depth
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Never hammer the sleeve into place
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Ensure the sleeve seats fully and evenly
Misalignment can cause injector damage, sealing failure, or premature sleeve cracking.
4. Cure Time Is Critical
After installation:
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Allow Loctite 620 to fully cure for a minimum of 24 hours
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Do not install injectors or add coolant before full cure
⏱️ Rushing this step can compromise the seal and lead to coolant intrusion into the fuel system.
Why Prep Matters on the 7.3 Powerstroke
The 7.3L Powerstroke is known for:
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High heat cycling
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Long service intervals
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Coolant exposure around injector cups
Proper bore prep combined with stainless sleeves and Loctite 620 dramatically reduces:
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Coolant-in-fuel failures
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Injector sleeve movement
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Repeat labor and downtime
Pro Tip
Many professional diesel builders consider stainless steel sleeves with Loctite 620 to be a lifetime fixwhen installed correctly.
