 Sudden loud engine noise!!!, Help me diagnose.. but be gentle! |
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| bondo |
 Dec 3 2005, 07:27 PM
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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! |
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| pfierb |
Dec 4 2005, 05:20 AM
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oldest member Group: Members Posts: 606 Joined: 1-May 05 From: The sign of good government in Connecticut is to keep raising taxes Member No.: 4,008 |
On my 73 2.0 had a similar noise....turned out to be a 10mm washer that a local "expert" Porsche shop had accidentally dropped into the manifold while changing a base gasket on one of the Webers.....they called me and said that the car had thrown a rod and for 6 to 12 thousand dollars they would rebuild the motor....I called one of the good guys in the club EJM and had the car flat bedded to his shop where he pulled the motor and found the washer embeded in a piston and cylinder head....Ed was able to clean up the gouges and reassemble...at a later date he pulled the carbs off and put the FI back runs great now....jeez but that is a long story just to tell you that something could have fallen off or thru of one of your carbs.
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Posts in this topic
bondo Sudden loud engine noise!!! Dec 3 2005, 07:27 PM
r_towle sounds valve related...
take off the valve covers... Dec 3 2005, 07:31 PM billswim Wow what a great tool that video camera turned out... Dec 3 2005, 07:32 PM J P Stein A big day for noises. Sounds valve related....use ... Dec 3 2005, 07:33 PM Bleyseng Sounds like a valve adjuster is in need of adjust... Dec 3 2005, 07:34 PM bondo Valves.. good..
It doesn't seem to me that i... Dec 3 2005, 07:55 PM Bleyseng The rocker can jump off the valve end and make tha... Dec 3 2005, 07:58 PM ChicagoChris It is a dropped valve seat.
I learned the hard... Dec 3 2005, 07:58 PM jkeyzer Pretty tinny/clacky sounding noise, my first guess... Dec 3 2005, 08:43 PM Eric Taylor Have you checked the exhaust? Mine has done that o... Dec 3 2005, 09:55 PM McMark Sounds remarkably like the valve head that broke o... Dec 3 2005, 10:18 PM Eric Taylor What if the noise stops after a while?
Eric Dec 3 2005, 11:01 PM SGB http://www.914world.com/bbs2/html/e... Dec 3 2005, 11:28 PM bondo Dec 4 2005, 12:30 AM scruz914 If it is a problem with a valve/valve seat a compr... Dec 4 2005, 12:45 AM Series9 Sounds like a rod bearing to me.
Regardless, I... Dec 4 2005, 12:49 AM bondo Dec 4 2005, 01:30 AM Dead Air Dec 4 2005, 08:25 AM Mark Henry Take the cover off and adjust your valves...if one... Dec 4 2005, 09:23 AM Mueller you might be lucky and one of the nuts came off of... Dec 4 2005, 11:15 AM Bleyseng http://www.914world.com/bbs2/h... Dec 4 2005, 12:24 PM Series9 I have a new opinion. Let's see if my logic h... Dec 4 2005, 12:40 PM Bleyseng definately a rocker/valve adjuster noise.....
rod... Dec 4 2005, 01:10 PM bondo Sean_V8_914 and hmeeder were just here delivering ... Dec 4 2005, 05:34 PM qa1142 my vote....
collapsed Hydrolic lifter - happend ... Dec 4 2005, 06:01 PM bondo Dec 4 2005, 11:47 PM bottomend The sound appears to be in unison with the exhaust... Dec 5 2005, 12:29 AM jhadler My first thought was remebering a quote from Star ... Dec 5 2005, 12:49 PM kwales How dirty is the oil?
If you have hydraulic lifte... Dec 5 2005, 05:41 PM bondo Ok, I pulled a valve cover, and here is what I fou... Jan 7 2006, 05:15 PM bondo I just had an epiphany that basically slapped me i... Jan 7 2006, 05:27 PM Joe Ricard Lifters are easy to pull. I would pull the suspec... Jan 7 2006, 06:53 PM bondo Success! I filled it with synthetic, and let i... Jan 7 2006, 06:58 PM kwales Getting the pushrods correctly seated into the hyd... Jan 7 2006, 07:09 PM bondo I never took it apart or messed with any adjustmen... Jan 7 2006, 07:12 PM kwales Check the valve gaps. Do you know who adjusted th... Jan 7 2006, 07:14 PM bondo Jan 7 2006, 07:42 PM bd1308 well...the late vanagons had L-jet on them and wer... Jan 7 2006, 07:51 PM bondo Jan 8 2006, 12:44 AM Tom Same thing happened to my 2.0 with hydraulic lifte... Jan 8 2006, 09:57 AM bd1308 usually, at least with solid lifters and cams, is ... Jan 8 2006, 10:00 AM CHAFF Tom something is buggin the hell outta me.
Could ... Jan 8 2006, 05:38 PM markb Jan 8 2006, 06:48 PM Tom Chaff,
Yes hydraulic lifters are possible. Some H... Jan 9 2006, 10:41 AM
kwales If the oil is dirty, those VW lifters can bleed do... Jan 9 2006, 01:40 PM |
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