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! |
Katmanken |
Jan 7 2006, 07:09 PM
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#2
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Getting the pushrods correctly seated into the hydraulic lifters can be a trick sometimes and can account for noise and misadjustment. Change the oil with synthetic, make sure the pushrod is in the appropriate place in the center of the lifter, not to one side. If it is to one side, you can damage the lifter. Recheck the valve adjustment. If you adjusted to a gap of .006 and ran it ,the pushrods are slopping around (NOT GOOD)and you need to readjust ALL valve gaps.
Hydraulics have no gap and some preload. Correct adjustment is 2 half turns of the adjuster screw (in tighter) past valve contact. Some adjust it in to just touching the valve, run it for a while and then turn it in 2 half turns tighter. That allows collapsed lifters to fill and then you adjust the valves correctly once they are fully pumped up. See Boston Bob's website for a full how to.... By the way, the manual is WRONG at 2 FULL turns past contact. Been discussed mightily on Vanagon forums. That should do it. Mine rarely clank after a synthetic change (20w50), a new good filter and an adjust. Fram filters kill hydraulic lifters too. Good luck! |
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