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| Timing chain stretch https://slantsix.org/forum/viewtopic.php?t=48197 |
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| Author: | wjajr [ Thu Mar 15, 2012 5:16 am ] |
| Post subject: | Timing chain stretch |
My timing chain looks to have about an eighth inch of movement or about 2 degrees. I discovered this after frigging around with the previous timing – carburation issue back a few threads by using a piston stop. The FSM states the 3/16th movement is allowable, how good is allowable, or should I be changing out the gear and chain soon? |
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| Author: | Dart270 [ Thu Mar 15, 2012 6:17 am ] |
| Post subject: | |
Where is the 1/8" of movement - laterally in the chain? If so, that is totally fine. 2 deg is not a big deal for a broken in chain. Lou |
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| Author: | CNC-Dude [ Thu Mar 15, 2012 9:18 am ] |
| Post subject: | |
A new timing chain will begin to get slack in it in just a few hundred miles. It looks like your still a ways off from the 3/16 limit, but I would keep an eye on it. If your timing mark on your balancer jumps around a lot, that is also an indication of chain slop, so you might use that as a gage if it gets worse. |
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| Author: | wjajr [ Thu Mar 15, 2012 1:15 pm ] |
| Post subject: | |
Piston stop was set at top of the stroke. Zero or TDC timing lines up with + 2 degree mark, and crank pulley moves an additional two degrees to +4 mark, 1/8th inch before movement at rotor is seen. It is hard to roll this engine over with plugs removed due to the stout valve springs. The timing mark looks to be steady under timing light. So I guess the chain is good for a while longer. |
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