Sudden loud engine noise!!!, Help me diagnose.. but be gentle! |
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Sudden loud engine noise!!!, Help me diagnose.. but be gentle! |
bondo |
Dec 3 2005, 07:27 PM
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#1
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Ok, I've got a 914, with an unknown engine (serial is for RoW 1.7) that was rebuilt "several years ago". Just now I was shuffling cars... started it up, backed it down the driveway. I let it warm up for a couple minutes and shut it off. Then I went to move the MG so I would have toom to park the 914 next to it. The 914 was off for maybe 5 minutes. When I went to start up the 914, it immediately had a loud clack/knock. I drove it up the driveway and parked it next to the MG, and it made the noise the whole way. (about 75 feet) I shut it off, went to get the camera to record some videos. Then I started it up, and recorded these videos:
First is idling at about 1400 RPM, for 30 seconds. Second is idling with a few blips of the throttle, also for 30 seconds. The videos are 2.7 megs each. Thanks! |
SGB |
Dec 3 2005, 11:28 PM
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#2
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
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I'm sorry to be inclined to say thats painfull to listen to. I think it prolly is a valve seat also, It is possible that an adjuster has backed off (but that really can't happen suddenly), or the rocker assembly has backe off far enough to let a pushrod fall out of the cup (and I can tell you from experience that noise is LOUD- like beating a garbage can), but that would more typically include a recent valve or rocker reassembly gone bad. Eric- a welladjusted motor is alittle noiser cold, and if the valve clearances are too great a motor will be noisy until realy compleely fully warm. My motor sometime is more noisy when first startedthan other times. I think it is due to the position of the pushrod and flat spots that devellop after many many miles. the pushrods turn as the reciprocate and I think sometimes they location when turned off is sorta flatened and therefor has greater clearance than oiginallly adjusted to, Does any of that make sense or am I just too imagianitive? |
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