Skip Navigation Links
Setup
New Post
Search
Forum Home
Home
Decoder

Original Message
Something's loose,...obviously I suppose
By John - 09/23/2002 7:54:21 PM; IP 142.177.92.152
Very interesting. The fact that the knock gets worse when you disconnect a sparkplug wire indicates something loose that rattles/knocks more when the engine has a vibration such as when a plug is not firing. This doesn't sound like bearings, but I could be wrong. If it's only # 7, then I'd suspect a valvetrain problem. If touching the lifters at an idle changes the sound like you say, this sort of backs up the theorey. I would check valve clearance(to check lifter adj) and lift (to check cam lobes) starting with # 7. Compare it to another cylinder if you're not sure of the specs. Are you sure it's not a tapping sound from lifters or valves vs a knock from deep inside the engine? Also, I've had no experience with Stainless Steel valves, but I did have a problem once that sounded like yours. With the SS valves you must certainly have had valve seats installed in the head. I had an insert fall out (partially) on a Datsun engine once that made a pretty terrible "knocking' sound. If the Machine Shop just put in the inserts, I wonder if one loosened and dropped out a tad.
This thread, so far...
Skip Navigation Links.
Collapse <a href=../ForumFE/reply.aspx?ID=14606&Reply=14606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14606" onclick="return false;">Knocking In A 428 CJ</a>&nbsp;-- <font color=#0000ff>Jim, <i>09/22/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14606', contentMargin: 60, icon: $('anchor14606') }); </script>  Knocking In A 428 CJ -- Jim, 09/22/2002
 RE: Knocking In A 428 CJ -- EEEd, 09/22/2002
 RE: Knocking In A 428 CJ -- John, 09/22/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14609&Reply=14606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14609" onclick="return false;">What kind of knock?</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>09/22/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14609', contentMargin: 60, icon: $('anchor14609') }); </script>  What kind of knock? -- Dave Shoe, 09/22/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14622&Reply=14606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14622" onclick="return false;">Pull the Plug wires</a>&nbsp;-- <font color=#0000ff>John, <i>09/23/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14622', contentMargin: 60, icon: $('anchor14622') }); </script>  Pull the Plug wires -- John, 09/23/2002
 RE: Pull the Plug wires -- Jim, 09/23/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14624&Reply=14606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14624" onclick="return false;">RE: What kind of knock?</a>&nbsp;-- <font color=#0000ff>Jim, <i>09/23/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14624', contentMargin: 60, icon: $('anchor14624') }); </script>  RE: What kind of knock? -- Jim, 09/23/2002
Collapse <b>Something's loose,...obviously I suppose</b>&nbsp;-- <font color=#0000ff>John, <i>09/23/2002</i></font>Something's loose,...obviously I suppose -- John, 09/23/2002
 RE: Something's loose,...obviously I suppose -- Ron D., 09/24/2002
 RE: Knocking In A 428 CJ -- Doug, 09/24/2002
 RE: Knocking In A 428 CJ -- Mike, 09/24/2002
Post A Response
Name:
Email Address:
Subject:
Post:
Upload Image:
Human Check:   Enter the code 2025151233 in the box