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Old 08-31-2011, 09:36 PM   #1 (permalink)
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Default Timing belt failure; bent valves always?

Just trying to determine if I can test compression simply after replacing the timing belt before buttoning everything up. '91 LSX 1.8. - 90K miles. Belt failed on a startup attempt, not while at elevated RPM's. Don't want to have to pull the head unless absolutely necessary.
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Old 09-01-2011, 01:08 AM   #2 (permalink)
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put a belt on and find out, 99% of the time bent valves.
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Old 09-01-2011, 01:58 AM   #3 (permalink)
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doubt you bent any valves with a ls motor
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Old 09-01-2011, 02:17 AM   #4 (permalink)
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Quote:
Originally Posted by sheryip View Post
doubt you bent any valves with a ls motor
Why not? They're all interference engines.
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Old 09-04-2011, 03:29 PM   #5 (permalink)
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O.K. - valve cover and top timing belt cover off today. Rotated crank pulley to TDC mark. Intake and exhaust cam sprocket marks line up perfectly, no teeth missing from belt, normal tension on belt. The shop that diagnosed timing belt is obviously wrong. I tried both raw gas and starting aerosol in the throttle body throat with no response. Pulled one plug wire and grounded to engine, then cranked and witnessed spark arcing. What next?
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Old 09-04-2011, 08:49 PM   #6 (permalink)
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Check Compression..... Is the engine rolling over? Does it sound like how it normally did when rolling it before this issue?
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Old 09-04-2011, 08:57 PM   #7 (permalink)
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I bought my LS DA bc the timing belt broke and they "bent the valves" but in fact what happend was when they replaced the timing belt they didnt know the trick to getting it in time, so it was a tooth out and we fixed it and i gotta $350 car!
just make sure you or whoever fixes it knows exactly what they are doing and like somebody else mentioned above, you shouldnt have any issues.
They were driving my car at 35-40 mph when the belt broke.
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Old 09-09-2011, 01:18 AM   #8 (permalink)
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uhhhh.... lol
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Old 09-09-2011, 08:55 AM   #9 (permalink)
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go and change the timing belt.. i remember when i purchased my first LS, i got it for $500 because it had a snapped timing belt, i also thought it had bent valves but it ended up not having any issues.. it really depends on the situation the belt snapped, but then again in your case you might have bent valves.. like i said get a new timing belt in there and check.
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Old 09-09-2011, 09:33 AM   #10 (permalink)
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my girlfriends 93 accord just recently broke the timing belt driving down the road at about 35. And NO bent valves
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Old 09-09-2011, 02:45 PM   #11 (permalink)
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yea snapped my timing belt on my LS a fw weeks ago going 10-20mph and no bent valves. either way if u have to buy a head ls head go for 150
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Old 09-09-2011, 02:58 PM   #12 (permalink)
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Just wondering, did all of you who said you didn't bent any valve actually do a compression & leak down test? Just because the car is still driving doesn't mean you didn't bend a valve.
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Old 09-09-2011, 03:57 PM   #13 (permalink)
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yea i actually did, had everything done once belt was installed.. if i remember correctly the compression was 190'ish accross.. also there i ended up finding out that the engine had been fully rebuilt with wiseco pistons, eagle rods, dual valve springs. etc. guess it was lucky buy for $500 bucks.
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Old 09-09-2011, 04:15 PM   #14 (permalink)
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lucky is an understatement.
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