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! |
Tom |
Jan 8 2006, 09:57 AM
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#2
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Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
Same thing happened to my 2.0 with hydraulic lifters. Running OK, shut it off. Next start, clakety- clack for about 10 minutes , slowly getting quiter. I knew what it was right off due to living with a 76 Dodge PU that I overhauled 16 years ago and put in a new cam and lifters. Every once and a while it is noisy on start up for several minutes. Been doing this for the past 10 years. What happens is this; if the leaky lifter is on the cam lobe under load when the engine stop turning, it will leak down. Upon initial start up it does not have the proper amount of oil in it and is noisy until it pumps back up. Probably should remove and replace this lifter , but otherwise the truck runs great.
I do think I should change out the lifters in my 2.0 while I have the engine out. Anyone have a procedure for doing this. Not tearing the engine apart, only cleaning it up and replacing the clutch. Any issues with just changing out the lifters and not the cam? Tom |
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