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| Persistent, worsening pinging https://slantsix.org/forum/viewtopic.php?t=45325 |
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| Author: | SlantSixDan [ Fri Jun 17, 2011 7:25 pm ] |
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Quote: points gap
Not on a '73, which has electronic ignition.Quote: check rockers..working properly w/valve cover off..visual inspect../pushrods /bent/ wrong adj gap can increase comp.
Already stated multiple valve adjustmentsQuote: any intake leak
Nope.  Thanks for ideas, tho. |
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| Author: | Reed [ Fri Jun 17, 2011 7:26 pm ] |
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OK- here is my dose of FABO advice- Slant sixes never run right! The best way to fix your pinging is to swap in a 440!  
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| Author: | Rick Covalt [ Fri Jun 17, 2011 7:30 pm ] |
| Post subject: | 440 |
Quote: The best way to fix your pinging is to swap in a 440!
That is good advice. Everyone know that a 440 gets better gas mileage than a slant 6 anyway!  Good luck Dan! Rick |
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| Author: | USAJon [ Fri Jun 17, 2011 8:00 pm ] |
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draging brakes? or non working oil pressure to pistons |
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| Author: | SlantSixDan [ Fri Jun 17, 2011 8:39 pm ] |
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Quote: draging brakes?
No, and no.
or non working oil pressure to pistons |
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| Author: | littleslant [ Fri Jun 17, 2011 8:43 pm ] |
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You probably checked the PCV and vacuum advance? |
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| Author: | SlantSixDan [ Fri Jun 17, 2011 9:21 pm ] |
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Yes -- all of that. It's not a simple routine case of ping caused by faulty state of tune. It's internal to the engine. I'm trying to figure out the mechanism, is all. |
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| Author: | sandy in BC [ Sat Jun 18, 2011 9:57 am ] |
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What do the plugs look like? Compression test? Leakdown test? Vacuum readings? Litres of oil per 1000kms? valve timing map? ......or are we just going to guess? |
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| Author: | USAJon [ Sat Jun 18, 2011 11:13 am ] |
| Post subject: | |
have you taken off the valve cover started , let idle and observed..look/listen? I just did that to adj my valves on our 1968..nice show ! |
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| Author: | easy803 [ Sat Jun 18, 2011 11:51 am ] |
| Post subject: | |
Quote: Quote: points gap
Not on a '73, which has electronic ignition.
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| Author: | Joshie225 [ Sat Jun 18, 2011 12:12 pm ] |
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Electronic ignition was standard equipment in 1973. I do not believe it was a delete option. If so everything was built with electronic ignition. |
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| Author: | SlantSixDan [ Sat Jun 18, 2011 12:41 pm ] |
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Quote: are we just going to guess?
Looks like it. Don't look like we're much into reading the question, either!
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| Author: | Reed [ Sat Jun 18, 2011 1:45 pm ] |
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Since we're guessing, Grapes! Gravy! Very small rocks! Sorry, I couldn't resist the Monty Python reference since we are taking about the machine that goes PING! Seriously though, it sounds like Dan has investigated all the possible causes of spark knock/preignition. I think this will wind up being an odd internal mechanical problem. That much timing chain slack on a motor with under 60k miles is unusual. I am going to bet a dollar the that problem will wind up being something like loose connecting rod cap bolts allowing the piston to rattle a bit or a loose wrist pin allowing some piston slap to happen, or an exhaust leak. |
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| Author: | emsvitil [ Sat Jun 18, 2011 2:43 pm ] |
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Pebbles in the hubcaps......... |
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| Author: | Slanted Opinion [ Sat Jun 18, 2011 3:21 pm ] |
| Post subject: | |
If you replace the engine and it still has the ping... run away, very fast. 
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