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Fbeca

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Posts: 13
Reply with quote  #1 
Just recently opened the gearbox for the first time to swap the the nozzle and cylinder head with the Laylax for Krytac ones and realized the shimming was exactly like the illustration in the manual (page 23) shows: with two part KA001-35U (stock shims) on top of sector gear and none on the bottom...

1) is this normal? like stock shimming as the illustration in the manual? seems a one size fits all kind of situation...

2) should I aim at a decent shimming job while trying to get at least a thin shim on the bottom of the sector gear so its not in direct contact with the bearing?

3) what is the thickness of stock shims (part KA001-35U)?

Thanks!
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KRISS Sierra Tango

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Kriss Staff
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Posts: 591
Reply with quote  #2 
With regard to shimming, yes this is normal. Please bear in mind that KRYTAC AEGs in general are mass produced, not hand-built boutique airsoft guns, using parts that we manufacture that are built within certain tolerances. The standard factory shimming diagram is designed to work with our components and their known tolerances.
Is it possible to fine tune the shimming? Absolutely. But this is impossible at the production level. Not only does this slow down production time for products that are already heavily backordered worldwide, this also greatly increases the cost of each airsoft gun due to the added labor and lower number of units being produced.

Factory shims measure approximately 0.2mm.

__________________
Please note, any specifications given in my posts (unless specifically noted) are North America/US market specifications. Your specifications may differ due to different markets, your country's regulations, etc.
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Fbeca

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Posts: 13
Reply with quote  #3 
Thanks, I understand that...just wanted to make sure I wasn't missing something since I have no experience...but, from what I could tell, the stock shimming seemed very good! Ended up replacing just the spring on the spur.

What did not impress me though was the Prometheus/Laylax cylinder head for Krytac specs...The stock cylinder head was much tighter with better compression...the Laylax was too loose - so much that I ended up keeping the stock I had (despite a small dent/bend in the cylinder head nozzle part). - and now probably buying a second cylinder head, this time stock from Krytac!

Thanks
best!  
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B3H1NDu

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Posts: 163
Reply with quote  #4 
It's pretty hard for a cylinder head to be too loose in a cylinder.

Remember that its held in place by the gearbox shell. Instead, your concern should be for air seal and build quality when it comes to a cylinder head. Its possible for a decently loose cylinder head to still seal better than one that fits extremely snug, and a full metal cylinder head will far outlast the stock cylinder head which is prone to cracking or having the brass nozzle snapping off after a lot of use.

Also it is quite common practice to use sealing products such as RTV silicone or Teflon tape to help sealing or fitment.
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