How to get circlip into Supertech piston?
#1
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So I'm building up my new block (84mm 9.0:1 Supertechs, Carrillo A-beams), and it's time to attach a piston to a rod. The wrist pins fit in nicely, now I need to install the circlips to hold them in place. Buh? These aren't snap rings! How are you supposed to get them into the grooves in the pistons?
--Ian
--Ian
#2
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put one corner in & slowly push it around until you get the the other end & clicks in (are you sure you want to be doing this if you cant install circlips)??? no disrespect maybe find a mate that has done this a couple of times, you dont want a motor letting go after you have put your hard urned cash into it.....
#3
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i agree with sprx3, i wouldnt trust my self, if you search theres a few post about wrist pin failure due to wronge tolerance. it seems pretty common that they need to be checked and machined for proper fit.
#4
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Try this spirolock tool, it is available in both plastic and steel:
The Lock In Tool - A piston locking tool for installing spiral wrist pin locks and wire wrist pin locks
The Lock In Tool - A piston locking tool for installing spiral wrist pin locks and wire wrist pin locks
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OK, got the first one in. Bent needle-nose helped a lot -- it only went springing across the room once.
Why don't they use snap rings? From googling around, it seems like lots of folks have problems getting them in, and I'd think snap rings would be whole lot easier.
thanks,
--Ian
Why don't they use snap rings? From googling around, it seems like lots of folks have problems getting them in, and I'd think snap rings would be whole lot easier.
thanks,
--Ian
#9
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Does the piston have pick lock grooves? It's a relief cut from the outside of the pin boss tower parallel to the pin axis that intersects the lock groove. If so, what you need is a straight pick or a small flat head screwdriver. Put the lock partially in the groove (it will only go in so far without compressing it) with one end of the lock completely overlapping the pick lock groove. Hold the lock partially in with one hand, put the pick in the groove with your other hand (groove acts as a pry location) and use the pick as a lever to compress the lock and slide it in at the same time. If that doesn't make sense I can take pics at work as I do it.
#10
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OK I'm having the same trouble. The stock pistons circlips are super easy with round x-section needle nose pliers. I tried the same technique on the Supertech pistons until I scratched them up.
iWeasel, is the technique you describe similar to that in the first half of the video on this page:
How to use the Lock In Tool
iWeasel, is the technique you describe similar to that in the first half of the video on this page:
How to use the Lock In Tool
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