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  • Bobcat 250 starting question

    This is the first Bobcat I've owned. Right after initial start it runs fast then after a few seconds it finally idles down. Never thought running cold engines wide open when they're cold was good for them. Is there anyway to adjust that out to allow a proper slow speed warm up?
    I guess the fact that they've been running for thousands of hours without problems settles the argument, but it just goes against what I've been taught about running cold air cooled engines hard right after initial start.
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  • #2
    I agree. I cringe when starting mine in the winter but that's how they are.
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    • #3
      My Trailblazer does the same thing. I bought it new and it has done this since day one. Sort of like cars with a carburetor the butterfly stays closed until the engine warms up.

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      • #4
        Bobcat 250 starting question

        I'm the same!! Makes me cringe every time I start mine. I never rev a motor up till has good oil pressure and cyl. temp is up. That's basic engine 101. And if I would have reved a cold engine up as a kid a would have got slapped up side the head, & well deserved. I hate to start my Big 40 Diesel cold.
        Agreed they do last but how much longer and less repairs would u have if we're set up correct.
        I always run high quality oil and good additive such as Lucas or equivalent to keep damage at Min. Still makes me cringe every start.

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        • #5
          Originally posted by Gobysky View Post
          This is the first Bobcat I've owned. Right after initial start it runs fast then after a few seconds it finally idles down. Never thought running cold engines wide open when they're cold was good for them. Is there anyway to adjust that out to allow a proper slow speed warm up?
          I guess the fact that they've been running for thousands of hours without problems settles the argument, but it just goes against what I've been taught about running cold air cooled engines hard right after initial start.
          I was taught the same as you. However, with age, experience, and education, I have learned this is the best way to start these engines.

          Let the howling begin.

          Griff

          P.S.
          Take Cruizer's advice and switch your oil to Castrol Syntec 5w50
          Last edited by griff01; 03-08-2014, 11:46 AM. Reason: addition

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          • #6
            Originally posted by gnforge:318384
            I'm the same!! Makes me cringe every time I start mine. I never rev a motor up till has good oil pressure and cyl. temp is up. That's basic engine 101. And if I would have reved a cold engine up as a kid a would have got slapped up side the head, & well deserved. I hate to start my Big 40 Diesel cold.
            Agreed they do last but how much longer and less repairs would u have if we're set up correct.
            I always run high quality oil and good additive such as Lucas or equivalent to keep damage at Min. Still makes me cringe every start.
            Are you talking fuel or oil additive? If it is fuel them Lucas is not worth much. Stanadyne or optilube is goof fuel additive for diesels.
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            • #7
              Originally posted by griff01 View Post
              I was taught the same as you. However, with age, experience, and education, I have learned this is the best way to start these engines.

              Let the howling begin.

              Griff

              P.S.
              Take Cruizer's advice and switch your oil to Castrol Syntec 5w50

              I have the gas engine. Was that 5w50 meant for the gas or the diesel?
              Syncrowave 200
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              Two big fire extinguishers

              "I'm a slow walker, but I never walk backwards" - Abraham Lincoln

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              • #8
                Originally posted by Gobysky View Post
                I have the gas engine. Was that 5w50 meant for the gas or the diesel?
                I know he recommends the 5w50 for the gas engines but I am not sure about the diesels.

                Griff

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                • #9
                  Bobcat 250 starting question

                  Elvis: I was talking oil.
                  I also agree, like stanadyne, better than Lucas and fppf etc. for fuel.

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                  • #10
                    Gnforge,
                    Sounds good. There seem to be a lot of people that assume that a big company that makes a fuel additive must make it well. Lucas, amsoil and the like don't make a good diesel fuel additive. Only a couple that are worth anything.
                    MillerMatic 251
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                    Cutmaster 42
                    Victor Journeyman OA

                    A rockcrawler, er money pit, in progress...

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                    • #11
                      Bobcat 250 starting question

                      We had tough winter here. Wile using polar power & some others jelled off 4 times.
                      Went back to stanadyne cold weather add.
                      Never jelled again. Proof in experience.
                      Sometimes we learn the hard way.
                      Had my big 40 injection pump rebuilt this winter, they sent me stanadyne add to use in it when got pump back. The guys rebuilding the pumps know what works. I did use Lucas till I learned the lesson the hard way. Now it's stanadyne only.
                      Thx

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                      • #12
                        Im guessing it starts at high idle because it has a constant load...the generator set. Kinda like spinning a flywheel

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                        • #13
                          Originally posted by tomwelds324 View Post
                          Im guessing it starts at high idle because it has a constant load...the generator set. Kinda like spinning a flywheel
                          Nope. Not unless you have a circuit completed. And you should not do that until after the machine is running.

                          Griff

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                          • #14
                            Originally posted by griff01 View Post
                            Nope. Not unless you have a circuit completed. And you should not do that until after the machine is running.

                            Griff
                            I think he is reffering to getting the rotating mass of the rotor up to speed, not an actual electrical load on the generator itself.


                            After it is idling and you are letting it warm up, to get an idea of engine temp, you can feel of the oil filter with your bare hand. The oil filter temperature is a good indication of what the general engine temp is. Nothing you can do about the high idle speed on initial start up though, like everyone else has already mentioned.

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                            • #15
                              Originally posted by elvis View Post
                              Are you talking fuel or oil additive? If it is fuel them Lucas is not worth much. Stanadyne or optilube is goof fuel additive for diesels.
                              Originally posted by gnforge View Post
                              Elvis: I was talking oil.
                              I also agree, like stanadyne, better than Lucas and fppf etc. for fuel.
                              Out of 19 additives tested in a third party blind test, Stanadyne Lubricity Formula only scored 8th out of 9 of the additives that tested better than the US Standard HFRR score of 520 and still missed the Engine Manufacturers Association desired target of 460 by 19 points. The Performance Formula didn't make the cut at all according to the test report below.

                              http://www.johnfjensen.com/Diesel_fu...itive_test.pdf

                              Disclaimer: Other independent or manufacturers tests as well as your personal results may vary.
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