Does yr 6.5 knock on cold start if it's 0 degrees F?

[Crankme69]

Both of mine will do it for like 5~10 sec. The truck has one known bad GP.

It's not the balancers or crank pulleys...and my truck has been doing this for at least the last 2 maybe 3 seasons, I'm really not sure for how long. Yes if I plug em in it's way less.

So how about yours does it do it?

Are both my motors ready to go boom?

TIA

 

[great white]

Knock?

Don't think so.

Hard diesel hammering noise?

Yup. Only lasts about 1-2 seconds. Only below 0c temps on an overnight cold start. Normal I'm thinking.

Didn't you have your Tdco value close to max?

 

[Crankme69]

Yes the TDCO they are both set near -1.85 range. That could very well be the reason it's more pronounced doh!

Thanks BJ! Just curious what is yrs set at?

 

[btfarm]

Hell Greg, my DMax hammers on cold start when it sets out in the lot at work when it's cold like that.
Fortunately we don't have winter this year.
OOPS! Sorry, back to the OP topic...

:hello:

 

[WarWagon]

Fix the GP! Engines really hate uneven power. More advance makes more knock on cold starts even here. The hotter I get the plugs the less smoke and knocking I get.

I am guessing your knock is the cold cyl firing when it wants.

 

[Crankme69]

Yea I hear ya guys...just makes me paranoid is all. I have been driving the VW for the daily work commute and it's quiet as a church mouse cold or hot & I hope I don't jinx it because it starts like a champ, (VW has no block heater).

Then on the weekends or snow days I get in one of the 6.5's & WOW I guess that I am not used to it anymore...

I hear ya on the GP! If it was an easy fix it would have been done already, that sucker is galled in there. I might get a wild notion someday to fudge with it...but I have some serious doubts I would be that lucky...sure as hell would hate to end up having to pull a head for 1 GP...

Thanks again all,
Greg

 

[great white]

Yes the TDCO they are both set near -1.85 range. That could very well be the reason it's more pronounced doh!

Thanks BJ! Just curious what is yrs set at?

IIRC, I have it set at 3.5 base and -.25 offset.

Sacrifice a couple hp for a quieter engine and a smudge less stress on the block, I'm good with that compromise.

 

[bison]

Sticky injectors i say.
Mine rattles like a bucket of nails at -40.

 

[L98TPI]

IIRC, I have it set at 3.5 base and -.25 offset.

Sacrifice a couple hp for a quieter engine and a smudge less stress on the block, I'm good with that compromise.

Indeed, this relationship is not considered enough. Combustion noise level increase = more peak stress on the pistons rods crank block head gaskets and so on. Cranking up the advance gets little but faster stress accumulation. IMHO The way the OEM's get away with direct injection in lightweight diesels is by carefully managing the injection with that new fangled electronic stuff .