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Old 28-05-2016, 22:22   #1
Gaijin
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Balance shaft belt snapped

Dodged a major bullet today.

A few weeks ago I was under the Evo looking at another issue and noticed the auxillary belt was cracked and looking a bit old.

Now, the Evo is well within it's belt service interval (it's on 45k and has had 2 timing belt changes already) but has been garaged pretty much since I brought it over here from England, so it started the cogs whirring as i've wanted to start using it a bit more as i've been learning more about engine mapping and wanted to do some datalogging etc.

Thus I elected to do the timing belt and associated tasks, as I felt I might as well if I was doing the auxillary belt anyway. So I ordered the kit and tools and this weekend started it at a leisurely pace.

So fast forward to today, after I put the engine in TDC and take the lower timing belt cover I was greeted by this:




Incidentally, the balance shaft belt has snapped at some point, no idea how long it's been like that, but judging from the pic above, it's been a while as you can see where the timing belt has cut a ridge into the balance belt from wear. Luckily the timing belt is intact.

I've not been in from the garage long but i'm quite perplexed as i've heard that not having an engine with a properly timed balance shaft, makes itself known by shaking you to pieces when you start it up - i've not noticed that at all when driving it. Anyone know how this could happen?

The other thing i've noticed is that the oil pump sprocket on the bottom right doesn't seem to be in the correct position. I believe the white mark on it should line up to the white mark near the bolt in the 10 o'clock position when the engine is at TDC. Haven't had much time to read up on it, but will be doing so - can anyone shed any light?
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Old 28-05-2016, 22:30   #2
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oil pump sprocket doesnt line up on every turn of the belt.... so that is normal..
you dodged a big cost..
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Old 29-05-2016, 06:42   #3
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Thanks for replying kikiturbo, I assume it would be correct to set it to the timing mark when replacing the timing belt though right? I'm aware of using a screwdriver to ensure it isn't 360 degrees out etc.
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Old 29-05-2016, 09:29   #4
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you have no idea of how lucky you were
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Old 29-05-2016, 20:17   #5
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balance belt elimination kit time
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Old 30-05-2016, 08:07   #6
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Originally Posted by Gaijin View Post
Thanks for replying kikiturbo, I assume it would be correct to set it to the timing mark when replacing the timing belt though right? I'm aware of using a screwdriver to ensure it isn't 360 degrees out etc.
IIRC the white mark will align every 3 revolutions of the engine... so if you spin it by hand a few times it should align..
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Old 30-05-2016, 08:22   #7
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Turn the sprocket and let it fall its self, when the timing mark falls near the timing mark then line it up and fit the belt and it wont be 360 out. Dont worry fussing with the screwdriver
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Old 30-05-2016, 08:23   #8
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Well if you couldn't notice any rough running with the balance belt out of service it makes you wonder why we have them at all?
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Old 30-05-2016, 10:59   #9
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Well if you couldn't notice any rough running with the balance belt out of service it makes you wonder why we have them at all?
The engine would vibrate more than normal, its just that he didnt notice it. While the shaft on the front side isnt rotating the rear shaft will be as its driven by the oil pump gear. It shouldnt be an issue really, you can run without both if you want to.

Lucky the balance shaft belt didnt interfere with the timing belt
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Old 13-09-2017, 12:31   #10
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Hi.
Who can let me know about my Mitsubishi EVO 9 MIVEC timing belt if broken will cause valve going to be bend valve ? Because my car is 2005 until now i never change a timing belt and balance belt . But i just run 50,000 km only in this 12 years. Thanks
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Old 13-09-2017, 13:14   #11
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Hi.
Who can let me know about my Mitsubishi EVO 9 MIVEC timing belt if broken will cause valve going to be bend valve ? Because my car is 2005 until now i never change a timing belt and balance belt . But i just run 50,000 km only in this 12 years. Thanks
change both the balance belt and cam belt. The pistons will hit the valves if they break, not only vlave damage, but usually piston damage and valve guide and rocker damage too

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Old 13-09-2017, 14:14   #12
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Ask again. As i bought a timing belt and balance belt bofore a fews years ago. 5~9 years. Can i use it ?
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Old 13-09-2017, 18:17   #13
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Ask again. As i bought a timing belt and balance belt bofore a fews years ago. 5~9 years. Can i use it ?
I wouldn't.
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Old 14-09-2017, 05:49   #14
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I wouldn't.
do you really think that a belt you buy in a store will be much fresher?
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Old 14-09-2017, 10:18   #15
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they should have a manufacture date stamped on them.
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