Tim4x4
Well-Known Member
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- In the shed. Making engines for ME
How do you determine a TD5 engine is suffering excessive crankcase pressure?
After a long journey on a hot day, windows open and front flaps open I could smell burning oil when stationary and engine running.
The smell was not to extreme but nevertheless I could smell it where normally I did not.
On investigation I found at the back of the rocker box at the gasket joint, corresponding to the half moon shaped detail some vaporised oil was escaping.
Looking around the area no excessive amounts of oil deposits on the cylinder head or on the gearbox bell housing suggesting to me if there is something wrong it has only just happened.
With the engine running I removed the oil filler cap, yes I could see a small amount of oil vapour coming out of the filler hole but how do I determine if what I see is excessive and needs remedial work?
I do understand that some vapour will be present and normally the closed system within the engine will deal with it by re-introducing the vapour into the induction system to be burned in the engine.
1. Why is vapour escaping from the rocker box gasket?
2. How do you determine a TD5 engine is suffering excessive crankcase pressure?
3. Is it the rocker box gasket failure, replace and all is OK?
4. Can the depression control valve have any influence?
Your advice will be much appreciated.
After a long journey on a hot day, windows open and front flaps open I could smell burning oil when stationary and engine running.
The smell was not to extreme but nevertheless I could smell it where normally I did not.
On investigation I found at the back of the rocker box at the gasket joint, corresponding to the half moon shaped detail some vaporised oil was escaping.
Looking around the area no excessive amounts of oil deposits on the cylinder head or on the gearbox bell housing suggesting to me if there is something wrong it has only just happened.
With the engine running I removed the oil filler cap, yes I could see a small amount of oil vapour coming out of the filler hole but how do I determine if what I see is excessive and needs remedial work?
I do understand that some vapour will be present and normally the closed system within the engine will deal with it by re-introducing the vapour into the induction system to be burned in the engine.
1. Why is vapour escaping from the rocker box gasket?
2. How do you determine a TD5 engine is suffering excessive crankcase pressure?
3. Is it the rocker box gasket failure, replace and all is OK?
4. Can the depression control valve have any influence?
Your advice will be much appreciated.
