12HT occasionally stalls when disengaging clutch

[Diesel Weasel]

Occasionally my 12HT will stall when I disengage the clutch as I come to a stop. The problem seems to only arise when the engine is below regular operating temperature.

My idle is set to 650, which is the factory default, but when I watch the RPM as I disengage the clutch, it actually drops below the 650 point to the 300-400 range. If the engine manages to recover, it jumps back up to 650. Any thoughts? Should I be upping my idle RPM or is there something else I should be looking at?

Thanks.

 

[gedrich]

I had the same problem with my HJ61 with the 12h-t. Only did it when cold and very inconvenient if you happened to changing gear thru a corner in town and the engine dies... the steering is veeeery heavy all of a sudden and the truck justs goes straight ahead!

An injector clean, tune up did help but not eradicate the problem. What did fix it was increasing the idle speed. I am not sure how accurate the tacho is but it now reads about 750 and I no longer have the stall problem.

cheers
Gerard

 

[Diesel Weasel]

Yes, that's the problem. I'll try increasing the idle and post my results. Thanks for the tip.

 

[Garry]

I had the same problem with my HJ61 with the 12h-t. Only did it when cold and very inconvenient if you happened to changing gear thru a corner in town and the engine dies... the steering is veeeery heavy all of a sudden and the truck justs goes straight ahead!

An injector clean, tune up did help but not eradicate the problem. What did fix it was increasing the idle speed. I am not sure how accurate the tacho is but it now reads about 750 and I no longer have the stall problem.

cheers
Gerard

Yep, same here. Up the idle by 50 or so. Worked for me.