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Catastrophic Failure

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Old Apr 21, 2011 | 06:24 AM
  #1  
Mitchell0406's Avatar
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Catastrophic Failure

I am looking at a EVO II, a while back the owner snapped the timing belt and when he had it replaced the mechanic said that there were two bent push rods. My question is if it would be cheaper to get a new engine r just replace the bent pushrods.
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Old Apr 21, 2011 | 07:24 AM
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Evos dont have push rods.. Is he talking about a bent valve?

I lossed a T-belt a long time ago on a DSM and ended up with 5 Intake or exhaust bent valves (I forget which side it was), but they weren't real bad. Just replaced all the valves on that side and it ran like a champ after.
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Old Apr 21, 2011 | 08:56 AM
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^u didn have to replace the pistons? Usually the pistons are in bad shape once they contact the valves. I know in my honda I did a money shift 1-2-1 at wot and before I could clutch it it was all over with, one piston had a hole in it from the valves and another was beat pretty bad.
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Old Apr 21, 2011 | 10:32 AM
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From: southcal
evos dont have pushrods, replace the valves and polish the spots on the piston, non a easy fix but you dont really need to replace the whole engine.
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Old Apr 21, 2011 | 10:53 AM
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Agree, should do perfecty fine just replacing the valves
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Old Apr 21, 2011 | 12:30 PM
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its a toss up if the pistons are shot but odds are the valves are gone. buy 16 valves for 200$, spend the money on a machine shop to seat them and you're good to go.
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Old Apr 21, 2011 | 03:18 PM
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You may of cracked a piston or worse. The results of a broken timing belt can range from no damage to damage so bad major overhaul is required. The common result, as stated above, is some bent valve heads. This may or may not crack a piston. If valve heads break off then the damage can be quite severe.
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Old Apr 21, 2011 | 11:03 PM
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I went and looked at it today and the engine wouldnt turn over. Would having bent valves cause this. If the mechanic said the pistons are bent what could that mean. Sorry im new to the whole EVO thing.
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Old Apr 22, 2011 | 07:01 AM
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Originally Posted by Mitchell0406
I went and looked at it today and the engine wouldnt turn over. Would having bent valves cause this. If the mechanic said the pistons are bent what could that mean. Sorry im new to the whole EVO thing.
The 4g63 is an interference engine. This means the valves and pistons occupy the same space at different times. Break a timing belt and they will try to occupy the same space at the same time. So, trying to turn over an engine with a broken timing belt is doing more damage.

Anyway, you need to tell us the actual condition of the engine - maybe talk to your mechanic again.
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Old Apr 22, 2011 | 07:29 AM
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The timing belt was replace prior to today, and has remained un-driven since.
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Old Apr 22, 2011 | 08:55 AM
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push rods lol
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Old Apr 23, 2011 | 02:01 AM
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From: southcal
just remove the head a see the damage
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