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11-20-2019, 02:09 PM
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#1
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New Member
Join Date: Nov 2019
Posts: 2
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C-7 Athearn Taking Too Long to Start? Any advice?
Greetings all,
I have a C-7 Athearn in my 2006 Thomas and it seems to be having an issue with starting.
Now, to clarify, it does start but it takes a considerable amount of cranking before it will finally kick over. For the most part it takes from between 7 to 12 seconds of cranking before it will finally start. If that doesn't sound like a long time, try just counting out 7 seconds and imagine the engine cranking the entire time before starting.
The engine seems to run just fine once it starts and I have no issues that I can find once the engine is going, it just takes forever for it to finally start. The engine temp seems to have no effect on this as I have both driven it till warm as well as let it idle until warm, turned it off and then immediately restarted it only to find that it still took considerable cranking for it to finally kick over.
I am curious if anyone here might have a theory as to what the issue might be? What would keep the engine from kicking over as quickly as it clearly should, regardless of temp?
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11-20-2019, 03:28 PM
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#2
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Quote:
Originally Posted by frontierphotographer
Greetings all,
I have a C-7 Athearn in my 2006 Thomas and it seems to be having an issue with starting.
Now, to clarify, it does start but it takes a considerable amount of cranking before it will finally kick over. For the most part it takes from between 7 to 12 seconds of cranking before it will finally start. If that doesn't sound like a long time, try just counting out 7 seconds and imagine the engine cranking the entire time before starting.
The engine seems to run just fine once it starts and I have no issues that I can find once the engine is going, it just takes forever for it to finally start. The engine temp seems to have no effect on this as I have both driven it till warm as well as let it idle until warm, turned it off and then immediately restarted it only to find that it still took considerable cranking for it to finally kick over.
I am curious if anyone here might have a theory as to what the issue might be? What would keep the engine from kicking over as quickly as it clearly should, regardless of temp?
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The 3126 and C7 just do that from what I've been told. Mine does.
Mine takes about 5-8 seconds usually. today took about ten as I haven't started it in 2 or 3 months.
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11-20-2019, 04:14 PM
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#3
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Bus Crazy
Join Date: Jun 2015
Location: Wisconsin
Posts: 1,259
Year: 2001
Coachwork: Bluebird
Chassis: All American
Engine: 8.3 Cummins ISC
Rated Cap: 75
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HEUI engines take awhile to fire when it's cold out and the oil is still thick.
It could possibly be a sign that your high pressure oil pump is starting to let go but you'd notice the motor cutting out at load if that was the case.
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11-20-2019, 04:19 PM
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#4
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Bus Geek
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
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Quote:
Originally Posted by WIbluebird
HEUI engines take awhile to fire when it's cold out and the oil is still thick.
It could possibly be a sign that your high pressure oil pump is starting to let go but you'd notice the motor cutting out at load if that was the case.
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C7,Twin Falls, Id, sub freezing temps. Bus starts in 3-4 seconds.
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11-20-2019, 05:58 PM
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#5
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New Member
Join Date: Nov 2019
Posts: 2
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Quote:
Originally Posted by EastCoastCB
The 3126 and C7 just do that from what I've been told. Mine does.
Mine takes about 5-8 seconds usually. today took about ten as I haven't started it in 2 or 3 months.
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Sorry, but I just don't buy that at all. There is no way that this engine is supposed to take between 7 and 10 seconds to start. I can't think of a single vehicle that has to crank over 20, 30 even 40 times before it will start. Nothing about that says that it is working properly.
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11-20-2019, 06:12 PM
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#6
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Quote:
Originally Posted by frontierphotographer
Sorry, but I just don't buy that at all. There is no way that this engine is supposed to take between 7 and 10 seconds to start. I can't think of a single vehicle that has to crank over 20, 30 even 40 times before it will start. Nothing about that says that it is working properly.
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I'm just telling you what I'm experiencing. Also Sam aka "Native" has the same.
AdeptApe says its pretty standard on 3126's and C7's. Mine looks and runs like its new. Quietest, smoothest running bus I've had.
How many medium duty Cat's have you had?
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11-22-2019, 04:46 PM
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#7
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Bus Crazy
Join Date: Aug 2019
Location: Moved to Zealand!
Posts: 1,517
Year: 2002
Coachwork: Thomas
Chassis: Freightliner FS-65
Engine: 7.2L Cat 3126 turbo diesel
Rated Cap: 71 passenger 30,000 gvwr
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In bringing my 'dead cat' back to life today -- a 3126: It only took 2-3 sec to start up and it hasn't been started in a month, and a years before that -- still on my fuel from 2017...
I would say you're loosing prime or injector pressure.
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11-22-2019, 04:51 PM
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#8
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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some hpop's just take a few more seconds.
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12-16-2022, 08:51 AM
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#9
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New Member
Join Date: Jul 2016
Location: Indianapolis
Posts: 6
Year: 2002
Coachwork: Thomas
Chassis: HDX Safety Liner
Engine: 3126 cat
Rated Cap: 72
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hard starting
I realize that this thread is a few years old but I just came across it. I had this exact same issue... it would take 5 or so seconds of cranking before it would start, warm it up, shut it off and restarted it and it still took 5 or so seconds of cranking to start. I've been trying to figure it out for a few years and finally figured out that one of the timing sensors was bad. Check engine light never came on as far as i know but it had a stored code for it. I replaced both timing sensors and it has started within 1-2 seconds every time ever since. Mine is a 2002 Thomas with a 3126 cat.
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