Grayish exhaust

[Ghostrider I]

Right, 1992 HJ 80 with 377,XXX Kms. Did some highway driving with it today 120km/h average. Oil temperature was around 250/75 degrees Fahrenheit during the drive. No abnormal noises. Got to a stoplight and was idling for about 3-4 minutes and a fair amount of grey exhaust was coming out. Light changed and exhaust was its normal black (tuned injector pump).
What gives? Can't be a head gasket, as it wasn't overheating.

 

[NCtoyota]

Right, 1992 HJ 80 with 377,XXX Kms. Did some highway driving with it today 120km/h average. Oil temperature was around 250/75 degrees Fahrenheit during the drive. No abnormal noises. Got to a stoplight and was idling for about 3-4 minutes and a fair amount of grey exhaust was coming out. Light changed and exhaust was its normal black (tuned injector pump).
What gives? Can't be a head gasket, as it wasn't overheating.

I have had grey smoke after idling with a leaking turbo seal. The vehicle drove completely normal but would 'load up' when idling.

In the past I have seen leaking injectors over fuel and cause grey smoke, but usually it comes with a bad fuel knock.

At the end of the day, it is a mechanical diesel that just needs oil, fuel and coolant.

 

[Ghostrider I]

I have had grey smoke after idling with a leaking turbo seal. The vehicle drove completely normal but would 'load up' when idling.

In the past I have seen leaking injectors over fuel and cause grey smoke, but usually it comes with a bad fuel knock.

At the end of the day, it is a mechanical diesel that just needs oil, fuel and coolant.

Nothing to be concerned about then?

 

[NCtoyota]

Nothing to be concerned about then?

As long as it's running good and has all its fluids. I always recommend an EGT and boost gauge to keep an eye on what's going on and out of your engine.

 

[Ghostrider I]

Ok...I have both gauges.

 

[Ghostrider I]

As long as it's running good and has all its fluids. I always recommend an EGT and boost gauge to keep an eye on what's going on and out of your engine.

Latest update...it's overheating, water temp past 200 oil around 225. Coolant overflow tank was bubbling. Hit the heater, but no hot air, I'm thinking thermostat?

 

[NCtoyota]

No heat and high water temps is textbook faulty thermostat. Overflow bubbling can just be the ebb and flow of coolant through normal operation.

What your normal coolant temp? Loss of coolant?

 

[Ghostrider I]

Well, the inevitable happened...driving along, water and oil temp spiked, started to lose power, and a crap ton of black exhaust spat out. Truck cut out, now it just cranks...my gut is saying head gasket

 

[NCtoyota]

Dang. Huge bummer.

 

[Squash]

Latest update...it's overheating, water temp past 200 oil around 225. Coolant overflow tank was bubbling. Hit the heater, but no hot air, I'm thinking thermostat?

No heat=no coolant or thermo.
Top up the rad

 

[bj70bc]

If fluid is being consumed and bubbles in overflow, it isnt overheating, its combustion pressure escaping into the coolant system and overflow and then the engine sucking in coolant and burning rad fluid. After it eats the rad fluid down it WILL overheat, and not give you heat through the heater core as the fluid is now too low to make it there
dropping rad fluid... bubbling overflow.... 100% headgasket
replace thermostat and fluid and check whats happening carefully
grey out the exhaust could be it burning coolant (if you 'normally' have black smoke) coolant is whitish clouds....mixed with a black rich tune would make gray... you can smell coolant burning, its a gross sweetish smell

any air bubbles in the overflow at idle and the HG is done
sometimes bubbles only show up in the overflow under load.... so harder to check