W

Wiltshire Mark

New Member
Hi Folks, I'm new here and need some help.
Over the winter my defender started to consume a lot of oil. I traced the fault to the breather system, it was pressurizing and the oil was going through the air intake. I have since taken the engine to bits replaced the piston rings, head gasket. But when I started it for the first time the problem remains.
Any ideas.
Cheers
 
fitting the rings in bore and measuring gap ,they often need filing to give the right gap ,is it actually blowing out when filler cap is removed did you get the right angle of cross hatch
 
Ok it's actually blowing out the filler cap, it sort of hovers if i twist it off and leave it over the filler. If I remove the breather pipe from the swirler it blows out there. It is looks smoky but I thinks its not smoke but vapourised oil. Assuming that cross hatch is where the gaps are then yes 60 degrees apart on the left as you look at the engine from the front. Didn't see anything in the book about gaps. How small should they have been?
 
nearly, cross hatch is pattern of honing on the bores ,unless its right it will burn oil or wear rapidly,presumably bores are worn and 11 thou and 15 thou of the top of my head ,was there a ridge on turbo side of bore about 10 mm down ,bores are machined to piston size minus 1/2 -1 thou for honing plus clearance size 1 thou ,rings are gapped to make sure there the correct fit in ore then refitted correctly to piston ,so if you just replace rings or piston they may or may not be right ,some info here on honing http://www.google.co.uk/url?sa=t&rc...sg=AFQjCNEpBiZiz7K_lTf3nJYAo72qG6k9Gw&cad=rja
 
There was slight ridge about 10mm down the bore.I used a 3 stone hone but to be honest the wear seemed that small that i only honed it to allow the rings to bed in.
My real issue is that despite thinking cracked piston of warn/missing rings causing the pressurisation the situation remains the same. I would have hoped for some improvement. Is there any where else that air can come from the pressurise top of the rockers.
Even before it fired for the first time since rebuild there was this white smoky haze in the rocker cover just from turning it over.
 
how much oils in it ,to be honest it sounds like bores are worn ,but wouldnt show till started ,are all valve clearances set right
 
Valve clearances are fine all checked out. It seemed to happen fairly suddenly in the winter. Could it be valve stems leaking exhaust or compression back up. That said it's fairly constant pressure not particularly pulsing with each stroke.
 
Done a bit more investigating with the engine running. I know it's not definitive but taking off various pipes the pressure seems to be in the rocker cover. ie the air seems to blow out of there not into there. If I take the filler cap off the air seems to be coming from the push rod side. I even to the rocker cover off with the engine running. Oh that was messy!!! but the air seems to be coming from the second or third pair of push rod channels.
As I've had the head off and fitted one of those multi layer metal and plastic[?] gaskets could it be leaking out of combustion chambers up the push rods?
 
You must log in or register to reply here.

Similar threads

O
Axle breather & oil query
Replies
6
Views
656
miktdish
miktdish
C
300tdi head gasket failure issues
Replies
2
Views
923
Chris6640
C
JPaussie26
Land Rover wont Idle!
Replies
2
Views
231
marjon
marjon
enjoi
P38A Going through radiators- not overheating
2 3
Replies
53
Views
2K
Datatek
Datatek
T
200tdi oil coming out of air filter box. Help!!
2
Replies
30
Views
2K
Dippypud
Dippypud