OEM Exhaust Valve - Benjamin 342
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OEM Exhaust Valve - Benjamin 342
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Topic: OEM Exhaust Valve - Benjamin 342 (Read 980 times))
SpiralGroove
Ruminating Perfectionist !!!
GTA Senior Contributor
Posts: 7195
>The gun's gotta look good and shoot straight ->
Real Name: Kirk
OEM Exhaust Valve - Benjamin 342
«
on:
March 14, 2017, 02:52:32 PM »
Hey Tim,
Received a valve replacement kit from you and scope mount yesterday
.
Read over your instructions and was surprised to see you recommending the OEM exhaust valve over the new (cheaper) one for the re-build. This assumes the OEM part is in reasonably good condition.
So today, I tried to clean up the OEM part (using my lathe to spin) and it looked good, .... until I noticed two small cracks running across the seal? Before cleaning, the gasket piece between the cracks seem to contain a flake of lead from a pellet or debris.
Here are two photos:
So IYO, should the part be reused, repaired or discarded
?
- Also, only the rear-end,
Lead Gasket
came out when the valve was removed. I think I need to get in there to remove this older piece for the rebuild as your PTFE gaskets are better - right?
I think re-using the lead parts is not recommended - right?
Thanks,
Kirk
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Bothell, WA
PCP's:
AR2079A-HPA (.177)
AR2079A-HPA (.22)
BSA R10 (.177) Huma Regulated
RAW HM1000x LRT Camo - (.20) + .177, .22 Barrels
RAW HM1000x LRT RED - (.25)
RAW HM1000x LRT Blue - (.22) + .25 Barrel
QB78 (.177) OEM
Pumper's:
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347
Springer's:
Beeman R9 (.20) - Circa 2019
Beeman R10 (.20) - Circa 1988
HW30S (.177)
HW35E (2) - Blued (.177)
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HW50S - Blued (.177)
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HW80S (.20)
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HW95 Hybrid (HW98 stock) (.177)
TimmyMac1
Expert
Posts: 1793
"You've Come A Long Way BB"
Re: OEM Exhaust Valve - Benjamin 342
«
Reply #1 on:
March 15, 2017, 09:50:37 PM »
The best exhaust valves we see are the late 70's and 80's vintage Sheridan stems. I fashion the back of them to accept the Benjy spring. Even over 30 year old parts will go another few decades if not torn up or damaged on the sealing surface. The older Benjy stems do not have as good a seal material as the Sheridans did. Yours is toast and the one in the kit is NOT a new part. It is an 80's take out. On the 342's they often have a long valve spring that can be shortened a little by taking it to coil bind so it relaxes a bit. That will make it easier to get the valve open and it will clear more pumps.
TimmyMac1
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"No Guns Would be a Riot"
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OEM Exhaust Valve - Benjamin 342