timing chain guide broke
11-02-2014, 01:39 PM
#1
Thread Starter
Join Date: 10-30-2014
Location: chandler ok
Posts: 3
timing chain guide broke
new to the forum my sons 09 hhr has 2.2 plastic guide broke . how likely of bent valves ? it happened on start up and has been turned over with the starter but not run. thank You in advance for Your replies !
11-02-2014, 01:49 PM
#2
Deceased
Join Date: 06-30-2010
Location: Kannapolis NC
Posts: 25,739
It would really depend on when the guide failed, high rpm or low rpm, and whether the timing chain went slack enough to jump a sprocket tooth on one or both of the cams.
Unfortunately, this is one of those "you aren't going to know until you get in there" deals. Unless you can lay your hands on a borescope to look at the piston crowns for "witness" marks left by the valves.
If the stars aligned right, and luck is on your side, the engine didn't jump time. But you'll find out for sure when you replace the chain and guides.
Unfortunately, this is one of those "you aren't going to know until you get in there" deals. Unless you can lay your hands on a borescope to look at the piston crowns for "witness" marks left by the valves.
If the stars aligned right, and luck is on your side, the engine didn't jump time. But you'll find out for sure when you replace the chain and guides.
11-09-2014, 06:40 PM
#4
Thread Starter
Join Date: 10-30-2014
Location: chandler ok
Posts: 3
Timing Chains
Just finished Sons car . No bent valves . Balance shaft chain was 1 tooth off I guess ever since new .Replaced guides chains gears & tensioner runs smooth as a baby tush .oh and only 4.5 hours to complete !
11-09-2014, 07:23 PM
#5
Technical Moderator
Join Date: 01-23-2009
Location: Fredericksburg, Virginia
Posts: 24,665
Do you have a DTC P0315? That will require a scantool to relearn the crankshaft position sensor.
If the engine was ever turned counter-clockwise the chains will jump teeth.
Oddly enough the "book" says 4 hours labor!
If the engine was ever turned counter-clockwise the chains will jump teeth.
Oddly enough the "book" says 4 hours labor!
Cool beans, glad you got it fixed up.
11-10-2014, 06:30 AM
#9
Join Date: 10-07-2014
Location: Cornelius NC
Posts: 2
should I replace timing chain tensioner before it fails?
2010 LS, 60K, just bought it last month. It is a GM CPO car with a 12m/12k warranty, but this car is for my daughter and I don't want any disasters while she's driving.
What are everyone's thoughts on having the timing chain tensioner replaced proactively, i.e. before it has a chance to fail? I have no problem with the cost if everyone thinks this is a good idea.
Thanks.
What are everyone's thoughts on having the timing chain tensioner replaced proactively, i.e. before it has a chance to fail? I have no problem with the cost if everyone thinks this is a good idea.
Thanks.