CM 871 Timing
02-03-2020, (Subject: CM 871 Timing ) 
Post: #1
CM 871 Timing
Hi Guys
I have a question on timing. Picked up CM871 and noticed that the 4/6 on the valve cover had been changed to 4.25/6. So, i went to the origional owner and in his files found that this truck had a recent overhaul, In the paper work they discribed setting the timing, i have attached a picture and was wondering if this is the proper way to set the timing at overhaul. Is this the base timing method? Thanks for the help.   
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02-03-2020, (Subject: CM 871 Timing ) 
Post: #2
RE: CM 871 Timing
They've used the proper static injection timing kit to get your timing as close to nominal as possible (0.5515).
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 Thanks given by: 2dlb
02-04-2020, (Subject: CM 871 Timing ) 
Post: #3
RE: CM 871 Timing
I have never had to use anything but 4/6 wedge on a CM871 engine... And they all come from the factory at that setting, the software expects them to all be set at exactly 4/6. - Not sure that the older methods even really apply on them as such, but that is up in the air for speculation.

Most of the time when they do this older methods, they also don't properly use loc-tite-609 on the tapered gears to secure them, so that they can take them on and off... Also only setting liner height to 0.010" (or less), and a lot of other things that i would not trust one damn bit.



Was it counter-bored?-- liners raised to 0.014"? -- was it a brand new head? Was it all OEM parts?

I would be skeptical of this build.


just my thoughts when reading this.
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 Thanks given by: 2dlb





  
  
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