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> Piston Slap?, Advice Please
solex
post Apr 19 2009, 05:52 PM
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I recently performed a top end rebuild on my engine with:
  • NOS Mahle pistons and cylinders
  • rebuild heads from HAM
  • Rebuild Raby rods
  • New Rod Bearings
During the break-in period everything was going well, using Brad Penn break-in oil, performed a tune up with new oil at 100 miles.

At about 150 miles I started to hear a knock at idle, sounded like it was coming from #2. The sound seemed to be some what reduced when the plug wire was disconnected.

At 200 miles I decided to do some more investigation; during oil change I noticed that there was a sludge / silvery substance on the oil strainer plate and decided to tear it down, thinking that there was a problem with a rod bearing.

The first thing I noticed was some rubbing on the #4 exhaust push rod.

I removed the heads and noticed that there was cylinder scoring on the tops and bottoms, remove the cylinders and saw the tops and bottom were worn... this must be the source of the silvery sludge. Attached are some pictures.

No what do I do? Any advice would be greatly appreciated... (IMG:style_emoticons/default/sad.gif) (IMG:style_emoticons/default/sad.gif)

Dan


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Posts in this topic
solex   Piston Slap?   Apr 19 2009, 05:52 PM
Jake Raby   Looks like the cylinder/ piston wasn't cleaned...   Apr 19 2009, 06:13 PM
r_towle   are there any markings on these "NOS" pi...   Apr 19 2009, 06:21 PM
solex   Yes Jake I take a number of short cuts and am now ...   Apr 19 2009, 06:30 PM
r_towle   Yes Jake I take a number of short cuts and am now...   Apr 19 2009, 06:32 PM
Jake Raby   Yep.. Most every time that people try to "get...   Apr 19 2009, 06:39 PM
solex   As you can imagine I'm kicking myself. :headba...   Apr 19 2009, 06:59 PM
Jake Raby   The pics aren't showing anything notable... Fe...   Apr 19 2009, 07:08 PM
solex   That pin looks like it was stuck in the rod. was ...   Apr 19 2009, 07:17 PM
Jake Raby   Not tomorrow.. I am scheduled on the dyno all day ...   Apr 19 2009, 07:24 PM
solex   I can talk to you on my way home tomorrow night, ...   Apr 19 2009, 07:30 PM
r_towle   It looks like the rod bearing spun...or is that ju...   Apr 19 2009, 07:28 PM
solex   It looks like the rod bearing spun...or is that j...   Apr 19 2009, 07:33 PM
Jake Raby   I thought the bearing had spun as well, but only o...   Apr 19 2009, 07:40 PM
solex   I thought the bearing had spun as well, but only ...   Apr 19 2009, 07:44 PM
jmill   Did you change the lifters out? Wonder if you swa...   Apr 20 2009, 07:23 AM
solex   Did you change the lifters out? Wonder if you sw...   Apr 20 2009, 07:37 AM
solex   After splitting the case, looks like I have some c...   Apr 22 2009, 07:53 PM
r_towle   looks like possibly the case did not close correct...   Apr 22 2009, 07:56 PM
solex   Rich, I think the dowels and bearings were all lin...   Apr 22 2009, 08:33 PM


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