Lahti35 Posted June 4 Share Posted June 4 I was tightening the chain on my 1920 roadster when I noticed the two link pins had no fastener. The mechanics repair manual says there is a fastener that goes here but what type is it? Is it cotter pin that goes through both pins? The manual mentions two chains, I have the early type that needs 1/2" slack and has the two pins. Link to comment Share on other sites More sharing options...
Mark Gregush Posted June 4 Share Posted June 4 (edited) Mine were very small cotter pins. Because of flexing, don't think I would use any type of wire but if you do, don't use copper. Edited June 4 by Mark Gregush (see edit history) 2 Link to comment Share on other sites More sharing options...
Lahti35 Posted June 4 Author Share Posted June 4 I figured a cotter pin would work, I've got a jar of vintage pins from tiny to large so no problem there. The mechanics book sounds like they want one cotter pin going through both chain pins, i'll have to reread it again. One pin or two is better than none! Link to comment Share on other sites More sharing options...
cutdown Posted June 6 Share Posted June 6 When you put the new split pin in, make sure you put it in, in the direction of travel, so that the end that is bent back, can not be straightened out again if making contact with some foreign object, [ which should not be in the engine anyway ] while the engine is running. BTW, the latest one I got from Myers, has to pieces to each link, forming a roller type action when in motion, similar to picture. Not a good drawing though 1 Link to comment Share on other sites More sharing options...
nat Posted June 7 Share Posted June 7 On 6/4/2024 at 11:45 AM, Mark Gregush said: Because of flexing, don't think I would use any type of wire The pins and the plates that both pins pass through don't hinge and shouldn't flex. Link to comment Share on other sites More sharing options...
Mark Gregush Posted June 7 Share Posted June 7 33 minutes ago, nat said: The pins and the plates that both pins pass through don't hinge and shouldn't flex. Shouldn't, I will have to tell mine that! LOL (Good point, I just don't want to take chances) Link to comment Share on other sites More sharing options...
nat Posted June 7 Share Posted June 7 The pins pass through seven stationary side plates and a straight cotter pin will pass through both pins. 1 Link to comment Share on other sites More sharing options...
nat Posted June 7 Share Posted June 7 That type of chain is known as "silent chain". There are more variables than what is described here but these are the basics. When identifying a silent chain, you can consider things like: Part description: Industry standard descriptions start with "SC" for silent chain, followed by the pitch in 1/8 in increments, the width in 1/4 in increments, and the guide link location. For example, a 3/4 in pitch, 2 in wide, side guide chain would be described as SC 6 (3/4 = 6/8) 08 (2” = 8/4) SG. Markings: Check the chain links for markings. Width: Measure the width over the pin heads and the width between guides if the chain is side guided. Joints: Determine if each chain joint has one or two pins. Components: Consider if the chain has spacers or a single oval pin. The shape of the links can also help identify the type of chain. For example, if the chain is for power transmission (PT), the shape of the driving links can help determine the type. 2 Link to comment Share on other sites More sharing options...
Lahti35 Posted June 10 Author Share Posted June 10 It's a darn small pin! The smallest one I had (.050") was still too big by just a hair... I'll try the hardware tomorrow and see if they have a tiny small one! Link to comment Share on other sites More sharing options...
jan arnett (2) Posted June 17 Share Posted June 17 I got mine at a lawn mower repair shop. 1 Link to comment Share on other sites More sharing options...
Lahti35 Posted June 17 Author Share Posted June 17 (edited) 8 hours ago, jan arnett (2) said: I got mine at a lawn mower repair shop. I've got a lifetime supply now, lol. None of the local older hardware stores had them that small in steel, only brass. Mcmaster Carr had them. Never thought about a lawn mower place... Edited June 17 by Lahti35 (see edit history) Link to comment Share on other sites More sharing options...
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