EPDM Coatings
rvupgradestore.com Composet Products Custom Yacht Interiors

Author Topic: Cat 350 diesel. - should I need to crank it below 35 degrees?  (Read 446 times)

KandT

  • ---
  • Posts: 906
Cat 350 diesel. - should I need to crank it below 35 degrees?
« on: November 26, 2017, 08:20:23 PM »
My cat C7 doesn't like to start when it is about 35 and below.  I wait until the "wait to start" light goes out but need to crank for 10 seconds or so - sometimes multiple tries.  Am I wearing out the starting motor by doing this?  Should it start faster?

Thanks!
2005 Winnebago Vectra 36RD
American Car Dolly
2009 Accord Toad
It's not a problem.  It's a project!

WILDEBILL308

  • ---
  • Posts: 2540
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #1 on: November 26, 2017, 08:25:44 PM »
Have you tried running your engine heater for 2-3 hours before trying to start? When it  is cold I leave my engine heater on overnight. (where you have shore power)
Try doing the wait to start a couple times before actually trying to start it.
Bill
2003 Bounder 38N
300 HP 5.9 Cummins
Allison 3000MH Trans.
Towing 2014 Honda CRV
Home base Fort Worth, Texas
A man who carries a cat by the tail learns something he can learn in no other way.
-Mark Twain-

billwild

  • ---
  • Posts: 702
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #2 on: November 26, 2017, 09:18:59 PM »
As Wildebill said, plug it in, and if you have battery boost, that is where you press the button to use both chassis and coach batteries  to start the engine, use it as well. I did both in very cool weather and the engine started well.


Bill
« Last Edit: November 26, 2017, 09:20:32 PM by billwild »

WILDEBILL308

  • ---
  • Posts: 2540
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #3 on: November 26, 2017, 09:32:24 PM »
I have ben lucky my coach starts well when cold. Doing the pre start sequence a couple of times will add more heat to the intake.
Bill
2003 Bounder 38N
300 HP 5.9 Cummins
Allison 3000MH Trans.
Towing 2014 Honda CRV
Home base Fort Worth, Texas
A man who carries a cat by the tail learns something he can learn in no other way.
-Mark Twain-

KandT

  • ---
  • Posts: 906
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #4 on: November 27, 2017, 04:46:54 AM »
Thanks - yes the heater does make a big difference but where it is stored now it would be quite a bit of effort to make that happen.  My chassis batts need changed so I do use the batt boost to start - maybe I just need to put new batts in the Chassis and it will crank right over.  I never thought to do the Prestart sequence a few times will give that a try as well - all good ideas thanks.
2005 Winnebago Vectra 36RD
American Car Dolly
2009 Accord Toad
It's not a problem.  It's a project!

WILDEBILL308

  • ---
  • Posts: 2540
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #5 on: November 27, 2017, 08:16:17 AM »
If your batteries are low you can run the generator to charge the batteries and power the engine heater.
Bill
2003 Bounder 38N
300 HP 5.9 Cummins
Allison 3000MH Trans.
Towing 2014 Honda CRV
Home base Fort Worth, Texas
A man who carries a cat by the tail learns something he can learn in no other way.
-Mark Twain-

boatbuilder

  • ---
  • Posts: 1124
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #6 on: November 27, 2017, 08:50:42 AM »
10 seconds at a clip should not harm the starter.  Heat is the biggest enemy of any electric motor. That is why most instructions tell you to crank no more than 20 to 30 seconds followed by a rest period to let it cool off. 
Charlie

Gary RV_Wizard

  • Forum Staff
  • ---
  • *
  • Posts: 62285
  • RVer Emeritus
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #7 on: November 27, 2017, 09:04:38 AM »
You should expect slower starting (more cranking) in cold weather, even after the Wait to Start light goes out. 10 seconds of cranking is not a problem, but I wouldn't go much more than that without a brief pause in between start attempts. Starters get hot, but that is less of a concern in cold weather anyway.

Low batteries results in a low cranking speed and higher amperage through the starter circuitry, so I would not leap to any conclusions until you get the chassis batteries replaced. My guess is that it will start a bit easier then.

In my limited experience with a Cummins ISL, it would start in about 4-5 seconds at those temperatures, even without using the block heater.
Gary
--------------
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Mile High

  • ---
  • Posts: 775
  • Lone Tree, CO
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #8 on: November 27, 2017, 03:18:27 PM »
Question is, are you starting it to go somewhere, or starting it to exercise it?  If just to exercise it, forget it and wait until it warms a little.
Brad and Dory
2013 Winnebago Itasca Meridian 42E (new to us 2016)
2013 Jeep Wrangler Unlimited Sahara
FMCA 457993 / WIT W170238

Sprucegum

  • ---
  • Posts: 176
Re: Cat 350 diesel. - should I need to crank it below 35 degrees?
« Reply #9 on: November 27, 2017, 05:56:58 PM »
Diesel engines start better when cranked at higher rpms. Stronger batteries and/or warmer temps give you higher rpms.
2014 Navion 24V on Mercedes Sprinter Chassis (SOLD)
Ready to roll after 9 years camping in one spot
F-150 TV
Shasta Revere 25BH

 

Hosted by Over The Network