best way to remove piston slap????
09-25-2009, 11:18 AM
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Piston slap?
How do you know that it is piston slap? I have a feeling what you are hearing at startup are hydraulic lifters. Sometimes, especially after sitting, they take a second or two to pump up. It should be fine, but don't rev the motor until it stops. A good engine flush might help and you may want to monitor your oil pressure closely.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
09-25-2009, 11:28 AM
#6
How do you know that it is piston slap? I have a feeling what you are hearing at startup are hydraulic lifters. Sometimes, especially after sitting, they take a second or two to pump up. It should be fine, but don't rev the motor until it stops. A good engine flush might help and you may want to monitor your oil pressure closely.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
09-25-2009, 01:54 PM
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How do you know that it is piston slap? I have a feeling what you are hearing at startup are hydraulic lifters. Sometimes, especially after sitting, they take a second or two to pump up. It should be fine, but don't rev the motor until it stops. A good engine flush might help and you may want to monitor your oil pressure closely.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
I've been driving my truck since I bought it at 78,000 miles with the supposed piston slap! It has 146,340 miles on it now! Hasn't blown up yet!
His advice to do a compression test is spot on if you're worried. In addition, if you are going through the trouble, perform a leakdown test as well if you find compression to be off!
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09-25-2009, 02:06 PM
#8
How do you know that it is piston slap? I have a feeling what you are hearing at startup are hydraulic lifters. Sometimes, especially after sitting, they take a second or two to pump up. It should be fine, but don't rev the motor until it stops. A good engine flush might help and you may want to monitor your oil pressure closely.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
Do a compression test to make sure it is not pistons. Potentially, they can swell as the motor warms up and stop slapping audibly. Even if this is the case the rings are worn and your clearances are way too loose. If your compression is weak, it's time to pull the motor. If your pistons are slapping it's a ticking time bomb that's gonna blow any day.
09-25-2009, 07:35 PM
#9
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Piston slap at start up is extremely common on the earlier GENIII engines and documented by GM to be an acceptable condition that will not cause any abnormal or increased wear. It's from the short skirt pistons rocking slightly in the cylinder until they expand from heat. My truck only does it on very cold days for a second or two, but some engines slap for a few minutes.
