Theoben SLR Reseal Part 2

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Lewis

Lewis

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May 2, 2015
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Eureka, California, United States
If you missed it, see part one here...

Theoben SLR Reseal Part 1

I recently resealed and replaced the piston crown on a Theoben SLR for fellow member Wijib. I thank you for trusting me with such a fine rifle. Firstly, this is an heirloom condition and quality rifle. It is a Theoben SLR .177 carbine with a Hyedua stock. All non marring tools are used and the...
www.airgunnation.com www.airgunnation.com

All new soft parts were installed.

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Appropriate lubricants for each application.

Superlube silicone synthetic greasewith PTFE for o-rings contacting metal.

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Moly Disulfide for metal to metal points.

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STP pure synthetic additive for inside the gas ram.

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Job done!
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Michigander said:
Beautiful gun!

I don't know if it matters, but although Super Lube does make a silicone grease, what was pictured was a synthetic grease.

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Well spotted, you are absolutely right. Thank you for the correction I edited the post to reflect the correct product.
I use the silicone for o-rings contacting plastic (not often in springers but occasionally in PCP's) and the synthetic where o-rings contact metal, which is the most common scenario. The important part of both formulas is the PTFE which is good for both the o-ring and the metal. Most importantly, for springers both Super Lube formulas include PTFE. Many other silicones do not, which makes them a poor choice for metal. Silicone can make a good carrier in the right scenario but PTFE and/or Molybdenum disulfide are the favored lubricants. The following usage cases are from an article on the subject.


Metal-on-Plastic
Lubricants with silicone or PTFE (polytetrafluoroethylene) are best for use on plastic surfaces. PTFE is hydrophobic, meaning it repels water, so lubricants containing it are effective in damp conditions. Silicone lubricants make surfaces ultra-slippery while repelling water. They’re safe to use on rubber, plastic, wood and metal. While some lubricants can be used around painting operations, silicone-based lubricants should not, so check the product’s label.



Plastic-on-Plastic
Silicone or PTFE products are suitable for plastic-to-plastic lubrication, but the silicone will form a thicker, wetter layer that may collect dust and dirt. PTFE will have a thinner, yet harder layer that will not attract dust or absorb grime.

Metal-on-Rubber
PTFE products are best for lubrication of rubber. They provide a thin, hard layer that protects best against the accumulation of dust and dirt.
 
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Thank you Lewis for posting this. Rebuilding Theoben's have been a black art for many years. Jim Bentley was kind enough to take many of my Sunday calls to teach me how to rebuild them. One of the conditions was to document the process. It's attached.
The stock is beautiful and rare. I always received those bland, bone SLR stocks.

View attachment 16947-Rebuilding-a-Theoben-Eliminator.pdf
 
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