1HDT Crankcase Vapors

[Jroc561]

92 HDJ81
119k Miles
ACSD removed

So since I installed a catchcan/started venting to atmosphere I noticed how much vapor I have coming out of my crankcase vent. Im hesitant to just say smoke because it starts as soon as the car starts and feel like it may be unburnt diesel flowing through, from a bad injector(s)

Did a compression test and everything was over 400, im not consuming any oil, no oil in the coolant.

Ive basically crossed off headgasket and im thinking it may need:

• Rebuilt Injectors
• Valve adjustments
• Worst case scenario new rings/rebuilt motor

The thing is its driving amazing, besides the blowby I removed the vented catch can from the engine bay and rerouted it to the framerails but you still see it when the car is parked or even when you are at a light.

Im already planning on getting my injectors rebuilt as soon as next week possibly. So ill report back if that clears it up or not

Also wondering if anyone noticed a reduction in blow by after rebuilding injectors or a valve adjustment.

 

[dan1554]

I would check valve seals/guides as a part of your diagnosis.

 

[Nz Nath]

I have similar on my 13bt powered landrover. A very visible smoke or mist out the vent. I have a very free flowing catch can that then vents to the chassis. You can see the smoke/vapour coming out any holes in the chassis rail when stationary. I also have grey diesel exhaust smoke at idle on cold start ups that takes ages to clear.

I had the compression checked (good) and injectors rebuilt. Made absolutely no difference at all to the crankcase vapors or to the exhaust smoke. The effect of the rebuilt injectors was actually a notable loss of power/torque, and less knock/rattle at idle. I attributed both of these to low crack pressure effectively advancing the timing.

I've since come across ADS injection. On their Facebook page they've posted a few times about high flow injectors for the 12ht, and in one of their posts they write that rebuilt injectors generally make less power than worn ones as they don't flow as well. Sadly they don't do high flow injectors for the 13bt.

Regarding the blow by, I've decided it's one of those things to just accept and not worry about.

 

[CruiserDog]

92 HDJ81
119k Miles
ACSD removed

So since I installed a catchcan/started venting to atmosphere I noticed how much vapor I have coming out of my crankcase vent. Im hesitant to just say smoke because it starts as soon as the car starts and feel like it may be unburnt diesel flowing through, from a bad injector(s)

Did a compression test and everything was over 400, im not consuming any oil, no oil in the coolant.

Ive basically crossed off headgasket and im thinking it may need:

• Rebuilt Injectors
• Valve adjustments
• Worst case scenario new rings/rebuilt motor

The thing is its driving amazing, besides the blowby I removed the vented catch can from the engine bay and rerouted it to the framerails but you still see it when the car is parked or even when you are at a light.

Im already planning on getting my injectors rebuilt as soon as next week possibly. So ill report back if that clears it up or not

Also wondering if anyone noticed a reduction in blow by after rebuilding injectors or a valve adjustment.

Well before you go and rebuild your injectors for an obscene amount try Diesel Purge from Liqimoly
My cruiser felt like it was cutting fuel in high RPMs.
now after I purged the truck it feels like it got some balls again.
it is a really!!! powerful detergent so it may also find a leaky return pipe as in my case

The smoke from the PCV tube seems normal if the truck is hot and the egts are up.

 

[Dougal]

That's why you route it back to the intake. It's cleaner to burn it. Brand new industrial engines still have significant crank-case vapours, you can't get rid of them.

 

[roscoFJ73]

Diesels generally have more blow by than petrol engines.

Also wondering if anyone noticed a reduction in blow by after rebuilding injectors or a valve adjustment.

I cant see how injectors would improve blow by. Blow by is a reaction to the compression stroke sneaking past the rings.
Valve adjustment maybe .
And I also agree burning it is the best way to deal with it.

 

[Jroc561]

Diesels generally have more blow by than petrol engines.



I cant see how injectors would improve blow by. Blow by is a reaction to the compression stroke sneaking past the rings.
Valve adjustment maybe .
And I also agree burning it is the best way to deal with it.

Youre absoultely right, my questioning was whether its just unburnt diesel being masked as blowby or "adding" to it from faulty injectors(my low IQ mind isnt sure if thats possible or not). I will most likely end up rerouting the catch can to be recirculating rather than vented.

Thank you team

 

[roscoFJ73]

All diesels smell like unburnt diesel to me. Bad injectors typically blow black smoke out the exhaust. Its estimated that 38000 people a year die from diesel emissions, half of them in the US. Recirculating the crank gases back through the engine burns the unburnt hydrocarbons and makes them less dangerous.