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Post by jstich on Aug 11, 2022 3:59:13 GMT -5
I've been trying to get a consistent grasp on chains with not much luck.I measured the centerline of the rivets holding a link and converted it to mm which comes out to 6.35mm .That matches what PFS calls the pitch on a #25 chain..So then I go to a #25 chain and it looks different than my cam chain.And then there's 420,426,etc type of chains and I can't find WTF my chain is regarding that. Nothing is standardized and different terminologies are just confusing and I can't make any GD sense of any of it.You need to be a trained machinist to figure out what's going on because I can't make much sense of it. The only progress I've made in hours researching is the centerline of the rivets for the links is 6.35mm.That lines up with what PFS calls pitch but I don't know what other parameters I need to pay attention to. No listings for cam chains list what chain type it is. #25? 426? No clue.Nightmare.
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Post by 190mech on Aug 11, 2022 4:23:10 GMT -5
Cam chains are not common chains,they are special built for the engine manufacturer..Ordering a 139qmb cam chain from any vendor should fit, you need to measure the link pin OD to see of the chain tool has a close match to its diameter.If so the tool will work and you can safely split and reassemble the chain...
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Post by jstich on Aug 29, 2022 2:10:52 GMT -5
Please look at the 2 pix of the chain breaker/vise type thing.0081 shows the extended pin that pushes the link/ rivet out of the chain. The problem is I'm supposed to have the pin part only flush with the outer part but as you can see the big part doesn't extend far enough towards the chain to accomplish this.
photo 0082 has the pin flush with the outer bolt part,but to make up the space difference I put what they call an anvil with a hole through it on the left side of the jaw.The hole in the anvil is big enough to accomadate the chain pin but it's pretty tight .This is the only 1 of the 3 anvils that has a hole through it. .
From my research the pin can break or bend if it's not flush with the outer bolt part while cranking the tool to remove the pin / rivet in the chain. . I got the exact same chain breaker kit that was linked by 190 mech. I think it's a good kit but don't want to mess up the tip because I only have one from the kit that will work with this chain.None of the pieces in the kit helps with this problem. Any help is appreciated.
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Post by 190mech on Aug 29, 2022 4:01:09 GMT -5
If you are worried about bending the breaker push pin, I would start with a bigger one till the chain pin is pushed flush with the outer link plate, then switch over to the correct breaker push pin..An anvil should be used on the back of the breaker to keep the chain centered on the breaker..
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Post by jstich on Aug 30, 2022 18:14:19 GMT -5
Thanks 190.With all the u tube videos I saw I shoulda been able to figure that out.It's gonna be really hot here the next few days( 100f 37c) so it'll be a bit before I try to get the old chain off.I'm too old and crabby to try to do it with those temps.
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Post by jstich on Sept 9, 2022 12:16:08 GMT -5
I managed to get the chain off. I knocked it flat with a bigger one then used the smallest one to push it all the way through. It's not bent or mushroomed but it's a bit scratched because I didn't have it perfectly on the link.
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Post by 190mech on Sept 9, 2022 16:51:34 GMT -5
COOL! Now it's time to install the new one!! Take some pics along the way...
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