I have a full rebuild on ca. Finally after numerous years I am looking to get her on the road.
Now wires in my gauges I can confirm 3.5 bar oil pressure at the block.
Takw off rocker covers ans no oil in the head.
What could cause this? Head gasket wrongly fitted. Blocked oil feed to head
Will be taking off next weekend for inspection. Anyone got any early ideas???
head gasket upside down?
Or wrong HG?
I have seen a couple of versions with different cutouts for oil, water etc.
Def not the wrong gasket. Cometic and had it for several years. Should replace it but still in good condition and seals as she should
Could it be the oil pump? Only pushing 3.5bar cold, I am sure it should be more?
even so, this should be enough to push oil to the head?
Is the gauge reliable ?
Blocked filter ?
There is oil in the engine right.
Just checking. You no full rebuild and all that
He must have oil in there as he has 3.5 bar from the block or oil pressure switch port (I guess reading was taken from?)Originally Posted by auz200sx
,but you are right in its a possible 'Forgotten' but rather important bit
The strainer on the pick up pipe will stop any chunks of engine crud or sealant getting drawn up from the sump,but still chance smaller bits have gone through and built up in a oil gallery,or if sealant has been used in excess elsewhere and that got into the oil feed to the head
Im sure skyshack will have better ideas
Is that 3.5bar at idle? what oil visc?
Causes could be
Wrongly fitted HG
Did you use any RTV on the gasket? if so it could have blocked the oil way
Blocked gallery in block or head
Blocked filter
Something not fitted/fitted incorrectly causeing massive oil haemoraging internally (piston cooling jets etc)
10 40 and idle is a little low. About 600. Not ran up to temp to set up because worried about no oil.
No rtv on the gasket
Think I will pull the oil line from turbo first and check I have oil there. Then off with the head and finally whip out the sump if needed.
Anyone know the flow of the oil from the pump. Does it go filter and then split to block and head???
General flow through an engine will be
Sump - Pick up - Oil pump - Filter - Main gallery
From there you get one feed to the turbo, one to the crank for the bearings and one to the head for the cams
Cheers mark. That what I thought, just needed to check.
Think I will test that oil is getting to turbo and filter first. If not then at least I know whether the blockage is in the head, galley or oil cooler
Got home early today so thought I would get ahead for the weekend. Whipped the head off and with a little bodgery I ran some tests and now really unsure what is going on
- Head gasket is on the right way! (I didnt make a school boy error)
- Cranking by hand I clearly get oil flowing to the turbo
- Blocked turbo oil feed and cranked the engine, took to 2 bar and could clearly see oil getting to piston one (rings not ran in so oil passing past). very light signs of oil getting to 2, 3 and 4 but faint. No sign of oil coming out of the feed to the head.
- Oil filter full of oil but extremely tight, had to do the old screwdriver through it to get it off. Doubt this has any effect on my symptons but worth mentioning
- During the rebuild, I had the cooler in pieces to clean out. Again no idea if this could be part of the problem?
the reason for the rebuild was that the old block cracked and oil and water mixed. I had cleaned all the parts out including the flushing the oil pump. The block was donated from a friend who had stored in a garage, it was bored and cleaned by my machinist.
Sorry for the long post, just wanted to get as much info up about the problem. I may drop the sump at the weekend, any ideas where to start next?
Thanks
Cormwall
I had the definitive answer to this problem a few mins ago in my head but as it was locked i couldnt post and have now forgot
Anyway, got to be a blockage doesnt it??? Cant you pull the sump and shove an airline down the gallerys.
Dont know how I locked it
dont have air lines sadly
Cant you poke something long, thin and bendy up/down it..??
I will leave it to the sxoc imagination about what to use.
Pipe cleaners grandad pipe smoker stylee (furry twisted wire sticks),welding rod (not the ARC rods with the crumbly coating),
metal coat hanger (straightened out of course)
Where is the head feed on the CA?
I would be taking the main gallery plugs out (will mean taking the box off though
this has a no-return valve that is possible blocked
I have concluded 3bar is not enough oil pressure when cold and there has to be a cause for this, I think after a little research it should be one of the following three things:
1 - Blocked gallery (unlikley but not impossible, block was bored and cleaned by machinest)
2 - Oil squirter loose and leaking oil
3 - O ring on oil pick up not sealed so sucking in air to the system, reducing pressure and and creating air locks. (most likely cause)
\\if none of the above, then I have no idea
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