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Old 09-05-2016, 09:43 PM   #141
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70 degrees out of the 180+ (or something) it needs to start easily.
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Old 09-05-2016, 09:43 PM   #142
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Shoot some starting fluid into it
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Old 09-05-2016, 09:51 PM   #143
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Consider this: A quick Google search indicates that diesel fuel needs 210 degrees C to ignite. Compressing air heats it up, but when the engine is cold, the compression rings may not seal as well as when it is warm, so it needs a bit of help bringing the combustion chamber air up to 210C. As an engine ages and wears, the compression isn't as strong when "cold" (as in, engine not brought up to operating range). When an engine is new, it may not even need glow plugs or heater grid (or if it does, only when it's very cold outside). But 10 - 15 - 20 years and a couple hundred thousand miles later, they may need the heat to start even on 80 degree days.
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Old 09-05-2016, 09:53 PM   #144
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Quote:
Originally Posted by Stu & Filo. T View Post
Shoot some starting fluid into it
I would *NEVER* do that on the Cummins 5.9, unless you want to blow the head right off of it, or risk a fire in the intake system, or something equally bad.
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Old 09-05-2016, 09:54 PM   #145
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I am thinking loss of compression is the issue, but it disappears once started?
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Old 09-05-2016, 10:01 PM   #146
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I might suggest finding some cetane booster, which may help with easier cold starts. Finding higher cetane fuel might be a challenge, but cetane boosting additive should be available at most truck stops and some big-box stores.

"A higher cetane number indicates that the fuel ignites more readily when sprayed into hot compressed air." (Source: Wikipedia)
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Old 09-05-2016, 10:03 PM   #147
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Remember, once started, the compression rings (along with countless other parts) will warm up and expand. The gaps in the rings will close up (and when rebuilding an engine, this gap is a critical measurement!) and seal better. So yes, it does "disappear" after it's started.
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Old 09-05-2016, 10:49 PM   #148
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Old 09-06-2016, 08:52 AM   #149
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how does it do when the engine is warm? so you drive it, shut it off, wait 30 minutes.. will it start right up?

is there a possibility your fuel is draining out and pump is losing prime so you have to pump fuel back up to the injector pump on each start?

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Old 09-06-2016, 08:54 AM   #150
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Originally Posted by Brad_SwiftFur View Post
Remember, once started, the compression rings (along with countless other parts) will warm up and expand. The gaps in the rings will close up (and when rebuilding an engine, this gap is a critical measurement!) and seal better. So yes, it does "disappear" after it's started.

plus the engine is spinning much faster when running so any leakdown through the rings is less percentage compared to the air compressed..

I do question compression since this bus had all the blow-by oil leak issues when under heavy load... extra high blow-by indicates compression / power loss as it is combustion gases being blown past the rings...

-Christopher
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