With thanks to those that have posted thus far
To those with functioning HEUI pumps
, those who undertake their own maintenance
, those who are mechanically minded
and those who just like to 'play'
As I continue to troubleshoot my warm starting issue –
it is looking increasing likely that the pump may well be the culprit, but I would like to learn 'why' –
others have suggested that the electrical coil inside the pump may be failing when hot
Caterpillar instructions when trouble shooting the HEUI pump is to observe the resistance of the solenoid within the pump WHEN COLD
A resistance of 8 ohms ± 2 ohms is considered acceptable
Caterpillar advise against checking the ohms readings whilst HOT as “a hot engine will show incorrect readings”
Finnings / Caterpillar are unable to assist, advising only to “check resistance when cold” !!
(With engine coolant temperature around 190 degrees F) - does anybody know what resistance a hot 'working' HEUI pump will display ??
(With all the usual legal liability 'not recommended', 'own risk', 'protective equipment', 'risk assessment' etc, etc stipulations )
when next in their engine bay, if easily accessible, would anybody like to 'put' a multimeter on their warm (operating temperature) pump, and post the resistance observed please ??
(My cold to hot resistance is a differential approaching 40% ?? - my reading / basic understanding of 'electrical resistance increase with temperature' suggests this is well outside normal / expected parameters ….......
but I do not know / cannot ascertain what is 'normal' for a hot functioning HEUI pump – hence my question
Thanks in anticipation for your continued assistance with this frustrating pursuit
2004 Cat C9 400bhp (9DG02935)