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Super Contributor

Re: Cat C15 dont start on battery but start on Air

The ECM enables the injectors when it detects engine speed, which is around 50 RPM. It sounds like the engine is just not cranking fast enough to build enough pressure in the cylinders to ignite the fuel.
Contributor

Re: Cat C15 dont start on battery but start on Air

Hi Dave,

Very good morning.  I am not able to convince the Mechanical engineers.  they keep climing that why it should start on air but not start on battery.  it is fact that battery engine is cranking maximum of 150 RPM and it does start on battery if we spary staring fluid on engine air intake.

 

when on air it is easily going to 170 RPM and engine start. 

 

in order to concince mechanical engineer ( I am from electrical and instcumentation) I need to know what is the ingnitian speed of this engine on knowing this information I can tell them that engine is reaching ignitian RPM but not starting and I can ask them to look on fuel injector and so on.  Please assist wtih this information please

 

C15 engine Serial number MCW02801

 

thanks and best regards

K.Parimalam

Super Contributor

Re: Cat C15 dont start on battery but start on Air

The valves and injectors should have been adjusted at 250Hrs. If that wasn't completed, I'd do it now and see if the engine starts better.
Contributor

Re: Cat C15 dont start on battery but start on Air

Hi Dave, thanks.  as of now 1755 running hours.  Fuel injector not touched so far.

 

thanks and best regards

K.Parimalam

Super Contributor

Re: Cat C15 dont start on battery but start on Air

How many hours on this engine? Have injectors ever been replaced?
Contributor

Re: Cat C15 dont start on battery but start on Air

Hi Dave,

Very good morning.  Thanks a lot for your assistance.   I installed seperate battery for ECM and ensured ECM voltage was study during startup and the problem remains same.  As I mentioned, if I use engine starting fluid engine getting started.  Hence I am not able to think further on this problem.  currently vessel using air start.  Any further suggestions?

 

thanks and best regards

K.Parimalam

Super Contributor

Re: Cat C15 dont start on battery but start on Air

Battery voltage to the engine ECM cannot drop below 9 volts. Connect the engine ECM to a separate battery completely isolated from the start batteries and try it.
Contributor

Re: Cat C15 dont start on battery but start on Air

Dear Members, very good morning.  Kindly assist to suggest.

 

thanks and best regards

K.Parimalam

Contributor

Re: Cat C15 dont start on battery but start on Air

Any suggestions?

 

Contributor

Re: Cat C15 dont start on battery but start on Air

Hi Dave,

Good day.  I went to vessel last week.  my self witnessed the engine start and I describe as below.

Air start always okay.  Engine RPM reaches close to 200 RPM and engine starts without problem.

on battery first time it reach around 180 RPM and engine start.  from 2nd start onwards engine rpm reach only 150 but could crank at 150 as long we keep the start button pressed.  this show that battery has capacity to crank for prolonged period of time but engine is not starting at 150 RPM

 

for the purpose of test while we crank the engine using battery at 150RPM, I sprayed engine starter spray at the fresh air intake side of the engine and the engine is getting started.

 

on seeing this - it comes to my mind that if ECM start give fuel to engine at 150, the engine will assist with fuel to raise RPM and engine can start. 

 

my question:

1. what is the starting RPM is needed for engine to start?

2. is it possible to make the ECM to release fuel at 150 RPM?  now it is not releasing the fuel at 150 RPM

3. what is the interface communication cable needed and software ?

 

sw part number 3145001-00

SW date JUN07

HW version 2433820.10

 

 

 

Kindly assist to advice.

 

thanks and  best regarsd

K.Parimalam