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Old Sep 27, 2023 | 02:44 PM
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Injector shims

Is it possible to create more problems if injectors are over-shimmed by say .001 or .002 ?
 
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Old Sep 28, 2023 | 09:11 AM
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From: Bahstun
.001-.004 is the spec

too tight wont fire well until warmed up
too loose timing will be delayed and or not fire at all
 
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Old Sep 29, 2023 | 05:47 AM
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thanks for the information,

so with clearance at .004 set cold, it would expand when hot and make it harder to start, closer to .001 the better.
 
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Old Sep 29, 2023 | 08:33 AM
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From: Bahstun
closer to .004 is better

cold oil is harder to compress/move
 
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Old Oct 24, 2023 | 01:15 PM
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.004 to .005 is new injectors according to the guy on ebay that sells shim kits. KIT COMES WITH:

1. Packets of TEN+ .004" and TEN+ .002" (one required per injector) special stainless-steel washers. TO BE INSTALLED UNDER THE ARMATURE PLATE TO INCREASE THE CLEARANCE BACK TO over .004" to .005" (like new injectors)
I am a 77-year-old mechanic that has worked on a fleet of 7.3 Power Strokes for the last 23+ years. ( Kit provider)

https://www.ebay.com/itm/94-03-7-3L-...oAAOSwZuFdjt5p
 
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Old Oct 26, 2023 | 02:00 AM
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Does oil viscosity play a role here? 10-30 vs 15-40?
 
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Old Oct 27, 2023 | 02:51 PM
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Originally Posted by carl2591
.004 to .005 is new injectors according to the guy on ebay that sells shim kits. KIT COMES WITH:

1. Packets of TEN+ .004" and TEN+ .002" (one required per injector) special stainless-steel washers. TO BE INSTALLED UNDER THE ARMATURE PLATE TO INCREASE THE CLEARANCE BACK TO over .004" to .005" (like new injectors)
I am a 77-year-old mechanic that has worked on a fleet of 7.3 Power Strokes for the last 23+ years. ( Kit provider)

https://www.ebay.com/itm/94-03-7-3L-...oAAOSwZuFdjt5p
Well if the guy on eBay trying to sell me something said it then it's obviously true and accurate.
 
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Old Oct 28, 2023 | 03:56 PM
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Never said it was true or right, but he has sold a **** ton and most are happy with results. If u think It's not right then don't buy, till then your opinion is like azzhole, every body has one.

Originally Posted by udsuth78
Well if the guy on eBay trying to sell me something said it then it's obviously true and accurate.
 
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Old Oct 30, 2023 | 08:36 AM
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Originally Posted by aawlberninf350
Just to be That Guy.

Does oil viscosity play a role here? 10-30 vs 15-40?
Yes. I changed from 15-40 to 5-40 and it helped with the cold starts. So.Cal cold, not Alaska cold. From memory it lowered the 'no start/hard start' temperature threshold by about 10 degrees. Some time later I shimmed my injectors to .004 and cured the problem. Most of them were at or near 0 clearance, some were a tight 0. #8 injector looked newer than the rest, it was the only one with measurable clearance. This was at around 430k miles, now at 446k.
 
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Old Oct 30, 2023 | 02:52 PM
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Originally Posted by '88 E-350
#8 injector looked newer than the rest, it was the only one with measurable clearance. This was at around 430k miles, now at 446k.
Likely because somebody threw an injector at a ghost code for #8 contribution test failing.
 
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