Reply
Highlighted
Contributor

Re: having a combustion burn time issue with a g3606

Hi Turbo

 

okay

 

but in your txt your said 

see copie part of your txt.: The check valve, needle valve, and combustion sensor and wire have been replaced. ????

 

But is okay.

 

I had an engine with carbon bild up in the fuel supply.

good to know for your meby near futher. if niddle valve opening not effect after you have swop or replace think or look at this.

special 9 : 1 comp engine. gas compression they can go run long time.

more than 11:1 gen sets

 

smal tip:

when we services spark plug and J gab is stil sharp.

Measure the plug OHM.

remove top cap clean 2 springs and restions.

measure OHM..... regap and use again we did it and extent spark plug live time some time up to 750 a 1000 hours depanding on engine load.

and keep clean all ignition parts breack cleaner no finger thoch before install.

 

GRT HJB

Henry Brand
Contributor

Re: having a combustion burn time issue with a g3606

Hi 

 

One more thing.

we had somthing in the past to.

 

the engine off shore runs long time with bad Check valve.

carbone was bild up inside cyl head bore for the PC fuel supply.

The bore between PC fuel line and the PC fuel camber to the check valve.

it restrict the fuel to the PC open Niddel valve more and more did not had efect on that cyl BT.

 

GRT HJB

Henry Brand
Contributor

Re: having a combustion burn time issue with a g3606

I am very sorry for not remembering about this topic. We called out our local CAT dealer and he found the new combustion sensor was faulty. Replaced it again and it worked fine.
Contributor

Re: having a combustion burn time issue with a g3606

Hi

 

This is an good point.

Check the gasket surface when remove the PC.

See who the surface looks.

clean the seat in the cyl head properly.

 

valve seat insuert can leak coolend to what killes the combustion.

we make dump with hole for bore scoop to replace PC and bore scoop to find it.

 

Grt HJB

 

Henry Brand
Contributor

Re: having a combustion burn time issue with a g3606

Valve recession on heads?
Trusted Contributor
Trusted Contributor

Re: having a combustion burn time issue with a g3606

You didn't say if this happened suddenly or just gradually moved to this condition.  So I will just review some things that are important.

1. Be sure that all the valve lash settings (inlet, exhaust, GAV) are correct, especially the GAV.  The GAV has a direct effect on the cylinder air/fuel ratio and must be correct with no tolerance.

2.The needle valves should all be in the range of about 3-5 when all the adjustments are set.  Needles valves too closed can cause cylinder misfire which will cause the burn time to be long.

3.The combustion feedback sensors must be in good condition for the burn times to be accurate.  Also the combustion sensor cables must be in good condition; the nominal resistance in the coaxial cable is 1 ohm.

4. The primary ignition and transformers must be in good condition.  If a cylinder is misfiring because of ignition issues, the burn time may be long.  The spark plug gap must be consistent at 0.011".

5.  Coolant leaking into the cylinder may cause the cylinder to misfire (too much leakage, putting the flame out) or may cause the burn time to be fast (adding fuel to the cylinder, coolant is a combustible).  Also the nozzle holes in the prechamber must in good condition and not eroded.  This will affect combustion propagation and burn time.  A bore scope inspection into the prechamber and into the cylinder can help detect a coolant leakage.

I am not sure what else to suggest.  It is important to be sure that the electrical noise is within tolerance.  Cat states that the maximum electrical noise(ripple) is 150 mVAC.  If it is higher, check to make sure that the engine block is grounded to earth ground.  Check all of the grounds in the electrical system.  Electrical noise can cause all kinds of uncommon and strange happenings in the control system.

 

Good luck and reply back when you have other information or questions?

Best Regards,

Al Hunt

Contributor

Re: having a combustion burn time issue with a g3606

Prechamber seat gasket leaking by,more than likely.also if your going that for replace it with trusty original parts.just saying.

 

Contributor

having a combustion burn time issue with a g3606

We have a g3606 that has a slow burn time on cyl 2. The burn times are set withing .1 on the other cylinders but cyl 2 will not get lower than 1.5m/s of the other cyls (approximately 5.5 m/s). The check valve, needle valve, and combustion sensor and wire have been replaced. The Pre Chamber was replaced with a refurbished one (not very thrilled about this), and the ICSM was switched with a known good unit. None of this has helped lower the burn time. The valve lash was verified and compression is 240 psig. Also, the spark plug that came out of that cyl had a brown tint to it while the other 5 had the typical ashy white color.

 

Exhaust temps on this cyl are inline with the other 5.

 

Is there something we are overlooking?

 

engine serial # 4zs01828