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Old 02-19-2020, 06:25 PM   #1
krystalized_fozzie
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Default Timing belt change issues

Hello forum.

Doing a timing belt on my JDM ej20. I had everything lined up (with marks) when removing timing belt. I removed the idlers/tensioners and the timing belt moved. The right side top cam (when facing car) rotated and I heard a metal tap sound. I think about 2-4 times. When moving the AVCS gear I was able to replicate the tapping sound, it free spun. I did not force the cam gear to turn or press valves. Just free spun the avcs gear.

Did I **** up my valves? Is this normal of acvs? Kind of panicking. First Subaru, first time doing a timing belt (on subaru)
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Old 02-19-2020, 08:42 PM   #2
awfulwaffle
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I think you're fine. It's very unlikely you generated enough force to damage anything just popping a cam off of some lifters. If you're feeling paranoid, go rent a compression tester and test the car (after finishing the timing belt job, obviously). Should take you all of an hour with the motor sitting in the car.
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Old 02-19-2020, 08:53 PM   #3
krystalized_fozzie
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Thank you for the reply. I assume bent valves would = low compression? I was able to mimic the metal sound in the movable acvs part for a few 1/4 turns back and fourth (where it moves freely, not forcing the cam to move) then it stopped. Not too sure how the ACVS valve works otherwise I could speculate
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Old 02-19-2020, 09:46 PM   #4
NighthawkSTI
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the noise you hear is just the valvetrain releasing under the valve spring tension. I had that happen 3 times when I did my timing belt....it doesnt snap back and rotate enough for the valves to contact each other. My car pulls like a freight train...it doesnt hurt anything...its sounds disconcerting when it happens because it rotates so suddenly. You should have a locking tool to lock the top and bottom sprocket together on that side, then it cant move once its all lined up.
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Old 02-19-2020, 11:15 PM   #5
krystalized_fozzie
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Thank you for your reply. Makes me feel better about my situation
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Old 02-24-2020, 10:02 AM   #6
krystalized_fozzie
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Update - timing belt kit fully installed. Started up first crank. No issues. Hopefully someone else in this situation sees this and gets some relief
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Old 02-24-2020, 04:46 PM   #7
NicMonte
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Happened to me when I did the timing belt on my jdm ej205 swap. Scared Me! I didnít read any threads leading up to the service before putting in the motor, then scanned threads left and right to make sure all was good. Obviously I had lined up the timing marks before doing so but boy was that a scare! Next service interval I will definitely have that cam lock tool. Wouldnít hurt, as I had to carefully put on the belt while it was loaded.
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Old 02-24-2020, 10:04 PM   #8
krystalized_fozzie
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Yes. It is definitely sketchy attempting to put belt onto cams that are under tension. I unfortunately did it solo. I used squeeze clamps to hold everything in place. Worked smoothly. Glad I don’t have to do this again for another 60k kms
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Old 02-25-2020, 12:08 PM   #9
NicMonte
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Quote:
Originally Posted by krystalized_fozzie View Post
Yes. It is definitely sketchy attempting to put belt onto cams that are under tension. I unfortunately did it solo. I used squeeze clamps to hold everything in place. Worked smoothly. Glad I donít have to do this again for another 60k kms


I literally lined up the cams under load while they held there on there own, then carefully put on the belt, left side first then right. Pulled the pin on the tensioner and it was all good. Never again though! Lol
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