Czechmate
Member
Hi everyone
Here we are again with yet another lost coolant / EGR cooling issue.
I have only a small amount of coolant disappearing. I have chased this around for a few months now.
I recently started getting a bit of sludge in my catch can (mann hummel provent 200, photos attached). The vehicle was also blowing a bit of blue, oily smelling smoke at idle once warm.
Also i started getting 30-40 ml of water out of my catch can every week or two, instead of 30-40ml of oil every month or two.
I noticed that if i took the catch can filter out the smoke reduced.
I investigated further and found a collapsed inlet spigot on my catch can, so replaced that with another genuine mann hummel provent 200.
I figured perhaps if the catch can was leaking then the crankcase ventilation wasnt being sucked out properly, and oil drawing past the rings was causing the smoke.
But nope still smokey idle, and water and sludge in the catch can.
So last weekend I thought righto lets have a dig.
I replaced engine oil and filter to have a proper look. Oil was fine, filter was normal.
Inspected coolant and expansion tank, all seemed normal except the expansion tank coolant was down maybe 300ml.
Then i pulled the rocker cover off for a look inside.
And found some small puddles of coolant on top of the head. (photos attached)
This d40 had a rebuild about 7 years/80,000 ks ago. That involved a new head, new timing gear, etc etc.
It has run perfect ever since. The vehicle has still only done 155,000 ks total from brand new in 2007.
The interesting thing is that it has never ever got hot, its never overflowed coolant or bubbled, theres never been milkyness or coolant in the oil..
Through a lot of recent forum trawling, ive found that the EGR tubes themselves can be a way for coolant to be introduced into the engine. My d40 is 07 auto STX so it has a cooled EGR across the front.
Ive had my EGR blanked off at the inlet end since day one so the coolant cant have entered into the engine that way.
Does anyone know of the likelihood that coolant could enter into the cylinder head from the (unblocked) exhaust end of the EGR tube?
Ive read that coolant can pool in the egr and enter through the exhaust valves. Im not entirely sure whether this example was with a yd25 in a d40 though..
Im probly clutching at straws here, but I really dont want to take the head off again, and unless its an unlucky failed gasket, head problems seem kindof unlikely...
Here we are again with yet another lost coolant / EGR cooling issue.
I have only a small amount of coolant disappearing. I have chased this around for a few months now.
I recently started getting a bit of sludge in my catch can (mann hummel provent 200, photos attached). The vehicle was also blowing a bit of blue, oily smelling smoke at idle once warm.
Also i started getting 30-40 ml of water out of my catch can every week or two, instead of 30-40ml of oil every month or two.
I noticed that if i took the catch can filter out the smoke reduced.
I investigated further and found a collapsed inlet spigot on my catch can, so replaced that with another genuine mann hummel provent 200.
I figured perhaps if the catch can was leaking then the crankcase ventilation wasnt being sucked out properly, and oil drawing past the rings was causing the smoke.
But nope still smokey idle, and water and sludge in the catch can.
So last weekend I thought righto lets have a dig.
I replaced engine oil and filter to have a proper look. Oil was fine, filter was normal.
Inspected coolant and expansion tank, all seemed normal except the expansion tank coolant was down maybe 300ml.
Then i pulled the rocker cover off for a look inside.
And found some small puddles of coolant on top of the head. (photos attached)
This d40 had a rebuild about 7 years/80,000 ks ago. That involved a new head, new timing gear, etc etc.
It has run perfect ever since. The vehicle has still only done 155,000 ks total from brand new in 2007.
The interesting thing is that it has never ever got hot, its never overflowed coolant or bubbled, theres never been milkyness or coolant in the oil..
Through a lot of recent forum trawling, ive found that the EGR tubes themselves can be a way for coolant to be introduced into the engine. My d40 is 07 auto STX so it has a cooled EGR across the front.
Ive had my EGR blanked off at the inlet end since day one so the coolant cant have entered into the engine that way.
Does anyone know of the likelihood that coolant could enter into the cylinder head from the (unblocked) exhaust end of the EGR tube?
Ive read that coolant can pool in the egr and enter through the exhaust valves. Im not entirely sure whether this example was with a yd25 in a d40 though..
Im probly clutching at straws here, but I really dont want to take the head off again, and unless its an unlucky failed gasket, head problems seem kindof unlikely...