failed breather?????

[Guest]

2002 2.7 car with 45k miles. Started running rough, then cleared, then rough again then lots of smoke then it cut out, all in the space of 2 mins. Coasted to a halt and tried to restart but wouldn't turn over. Recovered to dealer who removed and started to strip engine and discovered that 1, 2 & 5 bores were full of oil which was hydro-locking it. They can't find any mechanical problem and best guess is a faulty breather. Plan is to rebuild engine and fit new breather. I'd be a lot happier if I had a bit of broken metal in my hand as I struggle to see how a breather could dump so much oil into the inlet. There was some evidence of oil in the inlet but not huge amounts although it did stand over a weekend before going to the dealer. Anyone got any ideas?

 

[edgiee]

I don't know whether I'm breaking copyright or anything or whether this is 100% relevant, but I found this topic on Pistonheads :

http://www.pistonheads.com/gassing/topic.asp?t=204516&f=137&h=0

The last reply however is relevant - does anyone here have any ideas on this ?

 

[JCB..]

Yes

They are talking about two separate issues.

Blue smoke on start up is quite common on cold starts, particularly if the the engine didn't warm up when previously started and is nothing more than an embarrassment as it only happens when someone is watching. Happens on German boxer engines but, according to Scooby owners, not on Japanese ones. [&:]

Big cloud of smoke when moving without your engine falling out of the bottom of the car is probably your AOS. (air oil separator)

 

[Guest]

ORIGINAL: JCB..

Yes

They are talking about two separate issues.

Blue smoke on start up is quite common on cold starts, particularly if the the engine didn't warm up when previously started and is nothing more than an embarrassment as it only happens when someone is watching. Happens on German boxer engines but, according to Scooby owners, not on Japanese ones. [&:]

Big cloud of smoke when moving without your engine falling out of the bottom of the car is probably your AOS. (air oil separator)

yeah but could a failed breather allow enough oil into the bores to hyro-lock it?

 

[Guest]

Just thinking.......if a load of oil was dumped in the inlet manifold it would run down into any cylinder that had inlet valves open and back out of any cylinder that also had exhaust valves open. So, any cylinder that had just inlets open would fill up with oil (1, 2 & 5 in this case) and oil would go straight through through any cylinder that had exhausts and inlets open.

Any cam timing experts who could tell me if 1, 2 & 5 can be on valve overlap at the same time?

On this car there was significant amounts of oil in the exhaust system but what i'm struggling with is that a failed breather could dump so much oil into the inlet so quickly

Any thoughts welcome

 

[Guest]

[

ORIGINAL: mikeymike

2002 2.7 car with 45k miles. Started running rough, then cleared, then rough again then lots of smoke then it cut out, all in the space of 2 mins. Coasted to a halt and tried to restart but wouldn't turn over. Recovered to dealer who removed and started to strip engine and discovered that 1, 2 & 5 bores were full of oil which was hydro-locking it. They can't find any mechanical problem and best guess is a faulty breather. Plan is to rebuild engine and fit new breather. I'd be a lot happier if I had a bit of broken metal in my hand as I struggle to see how a breather could dump so much oil into the inlet. There was some evidence of oil in the inlet but not huge amounts although it did stand over a weekend before going to the dealer. Anyone got any ideas?

Up-date"¦"¦..

Engine was rebuilt with new breather and when started was rattling. Striped down again and main bearings are damaged, small end cracked and pistons distorted all due to initial hydro-lock. Dealer say engine uneconomic to repair and suggest new engine which will cost close to what the car is worth. Porsche have been approached for assistance and said no.

Plan is now either park it outside the dealer with sign relating story or get second hand engine.