oil in coolant overflow ....?
10-10-2008 | 06:51 PM
#1
Thread Starter
Instructor
Joined: Jun 2007
Posts: 188
Likes: 0
From: Jersey Shore
oil in coolant overflow ....?
but no coolant in the oil ? shes a 1999 996 C2 with mileage in the high 60's. I've heard anything from cracked head, cracked block, and cylinder sleeve slipage, to heat exchanger (oil cooler) ? ANY IDEA'S OR EASY WAYS TO DIAGNOIS THE PROBLEM ? NO ENGINE LIGHTS, NO LEAKS, NO SMOKE, AND HAD A FRIEND PUT A SNIFFER IN THE TAIL PIPE AND ALL READINGS WERE PERFECT ?!?!?!
10-10-2008 | 07:04 PM
#2
Racer
Joined: Jul 2008
Posts: 305
Likes: 0
From: Raleigh, NC
Could also be head gasket. Do a leak down test to be sure. This is different from a compression test.
http://en.wikipedia.org/wiki/Leak-down_tester
I would probably flush my coolant first, and see if oil returns. What is more common with a problem of this nature is excessive pressure in the coolant lines, caused by exhaust gasses leaking into the coolant system and adding additional (excessive) pressure.
http://en.wikipedia.org/wiki/Leak-down_tester
I would probably flush my coolant first, and see if oil returns. What is more common with a problem of this nature is excessive pressure in the coolant lines, caused by exhaust gasses leaking into the coolant system and adding additional (excessive) pressure.
10-12-2008 | 01:46 PM
#5
Drifting
Joined: May 2006
Posts: 2,442
Likes: 3
From: Another Ex pat Brit in SoCal
Given that it's a '99, there is a 'history' of cracked heads on the early M96 blocks
http://www.autofarm.co.uk/pdf/Total911_July06.pdf
Best of luck!
“The next things to be concerned about are cracked
cylinder heads”, says Steve. “The mounting point for the
hydraulic tappets is a weak point,” he explains. “The
head can crack from the bolted face across to a core
plug. This leads to oil forcing its way into the water
jacket.” So look out for tell-tale signs of contamination in
the coolant. Steve says that they have crack-testing
equipment and examine every head they take off, as a
matter of course. Interestingly, he says that they only ever
find cracks on left-hand heads, even though the castings
are identical. This could well be down to the way the
coolant circulates around the engine.
cylinder heads”, says Steve. “The mounting point for the
hydraulic tappets is a weak point,” he explains. “The
head can crack from the bolted face across to a core
plug. This leads to oil forcing its way into the water
jacket.” So look out for tell-tale signs of contamination in
the coolant. Steve says that they have crack-testing
equipment and examine every head they take off, as a
matter of course. Interestingly, he says that they only ever
find cracks on left-hand heads, even though the castings
are identical. This could well be down to the way the
coolant circulates around the engine.
Best of luck!
