88BB8B
Proven Member
- 179
- 18
- Oct 14, 2016
-
Coldstream,
BC_Canada
Hey guys, so I'm pretty perplexed by this. I double and triple checked my timing and tension as I was putting my motor together. Turning the motor many times. The tensioner was such that the pin slid in and out freely. (And yes I removed it before installing the cover.)
I checked it again after I got the cover and crank pulley on and remember those marks lining right up perfectly because it was really satisfying.
Fast forward to today and I have the motor in the car and almost ready to crank and I go to quadruple check my timing and it's off by 2 teeth. It seemed that the crank had skipped clockwise by 2 teeth. The only time I could see this happening was when I was hammering the crank bolt tight (my impact has bit the dust) pulling things apart I found that the tensioner had changed its position, it was now a little more extended and I could only get the pin in the first 2 holes, but I reset it with a vice and installed the pin properly.
I was worried about the valves, I turned the motor super super slowly and carefully when I checked the timing. I only turned over 2 times before I realized it was off. I didn't feel any obvious hard spots that would indicate hitting a valve. And I felt really good compression (should've had the spark plugs out) I did a quick check by blowing down into the sparkplug holes while playing with the cams. I could hear when valves were open and which valves were open, and I could hear when they were closed and things seemed as sealed as I would expect a never run set of rings to seal. To further my luck I'm running forged pistons with big valve reliefs, but stock valves, and cams, and most of my lifters are really floppy right now. So hopefully we escaped that without damage.
the belt could have been slightly loose, but it wasn't like the it was slack or anything I was getting like a mid G when I plucked between the cam gears, . And I've been continually checking while I work on the car to ensure tension hasn't released for some reason.
I obviously want to make sure this is put together all correctly and this doesn't happen when the car is running. I've read the VFAQ on timing and watched a bunch of videos, and I'm doing everything correctly as far as I can tell.
Or was it just that I put barley not enough tension on the belt and that was enough to allow it to skip by hand?
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I checked it again after I got the cover and crank pulley on and remember those marks lining right up perfectly because it was really satisfying.
Fast forward to today and I have the motor in the car and almost ready to crank and I go to quadruple check my timing and it's off by 2 teeth. It seemed that the crank had skipped clockwise by 2 teeth. The only time I could see this happening was when I was hammering the crank bolt tight (my impact has bit the dust) pulling things apart I found that the tensioner had changed its position, it was now a little more extended and I could only get the pin in the first 2 holes, but I reset it with a vice and installed the pin properly.
I was worried about the valves, I turned the motor super super slowly and carefully when I checked the timing. I only turned over 2 times before I realized it was off. I didn't feel any obvious hard spots that would indicate hitting a valve. And I felt really good compression (should've had the spark plugs out) I did a quick check by blowing down into the sparkplug holes while playing with the cams. I could hear when valves were open and which valves were open, and I could hear when they were closed and things seemed as sealed as I would expect a never run set of rings to seal. To further my luck I'm running forged pistons with big valve reliefs, but stock valves, and cams, and most of my lifters are really floppy right now. So hopefully we escaped that without damage.
the belt could have been slightly loose, but it wasn't like the it was slack or anything I was getting like a mid G when I plucked between the cam gears, . And I've been continually checking while I work on the car to ensure tension hasn't released for some reason.
I obviously want to make sure this is put together all correctly and this doesn't happen when the car is running. I've read the VFAQ on timing and watched a bunch of videos, and I'm doing everything correctly as far as I can tell.
Or was it just that I put barley not enough tension on the belt and that was enough to allow it to skip by hand?