200 tdi engine backpressure

satchmolips · Nov 28, 2018

Have 200tdi which was reconned about 4 years ago. Has been fine and have noticed no drop off in performance. But a lot of oil coming through from the pipe which goes from Oil cyclone breather to air filter housing which the drips out. Have cleaned cyclone out and have changed for a new one today, .,..will see. But there seems to be a lot of pressure in the crankcase, enough to send small amounts of oil spluttering up dipstick tube if I take dip stick out. Cant think that it is the piston rings already? Someone mentioned they have know the brake servo pump to go wrong and pressurise engine (??) but brakes working fine. How best to diagnose the cause please?

zeaphod · Nov 28, 2018

A pressure test will tell you if gases are getting past the piston rings.

satchmolips · Nov 28, 2018

I am hoping perhaps it is head gasket. Can they blow to cause this issue? All well with water and oil, not mixing.

jamesmartin · Nov 28, 2018

satchmolips said:
Have 200tdi which was reconned about 4 years ago. Has been fine and have noticed no drop off in performance. But a lot of oil coming through from the pipe which goes from Oil cyclone breather to air filter housing which the drips out. Have cleaned cyclone out and have changed for a new one today, .,..will see. But there seems to be a lot of pressure in the crankcase, enough to send small amounts of oil spluttering up dipstick tube if I take dip stick out. Cant think that it is the piston rings already? Someone mentioned they have know the brake servo pump to go wrong and pressurise engine (??) but brakes working fine. How best to diagnose the cause please?

you can remove the pipe from vac pump and plug the hole if pressure in block reduces you know its a leak in vac hose or servo,head gasket can cause it , oil and water mixing is a rare head gasket symptom with a tdi

satchmolips · Nov 28, 2018

thanks James, to be clear plug the hole in the vac pump body? And any way of diagnosing if it is head gasket other than taking it off?

jamesmartin · Nov 28, 2018

satchmolips said:
thanks James, to be clear plug the hole in the vac pump body? And any way of diagnosing if it is head gasket other than taking it off?

the outlet were hose was fitted
compression test but may aswell take head off and inspect bores if gaskets fine and it is likely only a stain across on or more of the fire rings in the gasket

satchmolips · Dec 8, 2018

Had the head off and it was blowing well between 2 and 3. Skim and pressure test and all sorted. Engineer gave me a tip. Put some grease under the cylinder head bolt flanges, otherwise they "creak" and you get a false torque reading.

200 tdi engine backpressure

satchmolips

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zeaphod

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satchmolips

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jamesmartin

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satchmolips

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jamesmartin

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satchmolips

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