The dreaded knock. |
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The dreaded knock. |
atmadsen914 |
Dec 28 2008, 11:06 PM
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#1
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Am I sure I like old cars? Group: Members Posts: 45 Joined: 7-September 07 From: Carlinville IL Member No.: 8,087 Region Association: Upper MidWest |
I recently rebuilt a 2.0/4 motor and installed it in my 914. After getting many fuel system issues sorted out I finally was able to drive it a few times but after about 150 miles of driving. It developed a knock. I readjusted the valves and the knock seems to get better but never goes away. The knock is audible from idle to about 1500 rpm then smoothes out. When I roll the motor over by hand I can hear a knock on every cylinder.
The motor is basically stock with the exception of a web cam (73 grind). I am about to pull the motor and start disassembling as the sound does not seem good. However after many hours of tinkering has not gotten worse. Ideas? or do I just get to do it all over again? |
SGB |
Dec 30 2008, 02:44 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 |
exhaust is tight? Those valves are RIGHT THERE at the exit from the head. They actually do go "tapitty-tap" in a distinct metal to metal way that is essentially muted by the rest of the exhast-
BUT- If it does this on rotation by hand, there is something mechanical going on. Did the rockers go back on OK? Sure those pushrods were seated when you set the valve adjusty? |
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