- David
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Lack of oil pressure.
This is slightly wierd.
BX I've just put the head back on to is exhibiting some rather odd symptoms.
History:
This is DavidB / Marty / My landlord's old BX. A TZD turbo with retrofit aircon. About 9 months ago, the aux belt shredded on a badly aligned pulley and wrapped itself around the cambelt, slipping it several teeth. Pistons met valves. Camshaft in numerous pieces. Bottom end unmarked, head wrecked. Standard stuff.
Old head off. Replacement head (from a 1.9TD 405 I ought to add) skimmed and fitted. BX N/A camshaft fitted. New cambelt. Only thing "wrong" is that the oil strainer for the turbo in the feed pipe crumbled when it was removed, so the pipe was re-installed with the strainer missing. I've never found anything in one of these strainers, so I've no issue with that, but it does alter the seal at the end of the pipe....
Started the engine today, and it appears to have issues with gaining oil pressure. The sump plug and old oil filter were left off for about 3 days, so the pump and galleries will have drained completely. It has a new oil filter and a fresh sump of oil. If the engine is revved to 2000rpm, the oil warn lamp flickers a bit, but won't go off completely. I've run the engine for about 30 seconds in total.. surely that's enough to fill the filter, oilways, turbo etc and gain oil pressure? I can't run it for any longer at the moment as the cooling system isn't back together yet, but I am concerned as usually on an XUD the oil lamp is out within a few seconds.
What have I missed?
BX I've just put the head back on to is exhibiting some rather odd symptoms.
History:
This is DavidB / Marty / My landlord's old BX. A TZD turbo with retrofit aircon. About 9 months ago, the aux belt shredded on a badly aligned pulley and wrapped itself around the cambelt, slipping it several teeth. Pistons met valves. Camshaft in numerous pieces. Bottom end unmarked, head wrecked. Standard stuff.
Old head off. Replacement head (from a 1.9TD 405 I ought to add) skimmed and fitted. BX N/A camshaft fitted. New cambelt. Only thing "wrong" is that the oil strainer for the turbo in the feed pipe crumbled when it was removed, so the pipe was re-installed with the strainer missing. I've never found anything in one of these strainers, so I've no issue with that, but it does alter the seal at the end of the pipe....
Started the engine today, and it appears to have issues with gaining oil pressure. The sump plug and old oil filter were left off for about 3 days, so the pump and galleries will have drained completely. It has a new oil filter and a fresh sump of oil. If the engine is revved to 2000rpm, the oil warn lamp flickers a bit, but won't go off completely. I've run the engine for about 30 seconds in total.. surely that's enough to fill the filter, oilways, turbo etc and gain oil pressure? I can't run it for any longer at the moment as the cooling system isn't back together yet, but I am concerned as usually on an XUD the oil lamp is out within a few seconds.
What have I missed?
... all landings are in fact controlled crashes, and any crash you can walk away from is a good landing. The definition of a good pilot is a man with the same number of landings as take-offs.
- mat_the_cat
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Re: Lack of oil pressure.
The only thing I can think of would be the feed to the vacuum pump - but I'm certain you'd find it difficult to miss an engine bay full of oil!
If you have another pressure switch I'd be inclined to try it perhaps...
If you have another pressure switch I'd be inclined to try it perhaps...
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Re: Lack of oil pressure.
I think the clue is in your info David. The pick up point on all engines is very important.
Too high in the sump and it gives exactly the symptoms you describe.
Too low and you usually get no pick up at all and therefore no oil pressure, even though it's filled with oil.
This occurs when the strainer is less than 1/4" from the sump floor.
I've actually measured it once on an Escourt mexico. but optimum distance for the pick up with strainer would be between 1/2" and 1" .
The Mexico was showing your symtoms after rebuild (without strainer) Fitted strainer but noticed that pick up pipe was bent and straightened it (too much) ergo no oil pressure.
bent it up some and magic, aok.
Too high in the sump and it gives exactly the symptoms you describe.
Too low and you usually get no pick up at all and therefore no oil pressure, even though it's filled with oil.
This occurs when the strainer is less than 1/4" from the sump floor.
I've actually measured it once on an Escourt mexico. but optimum distance for the pick up with strainer would be between 1/2" and 1" .
The Mexico was showing your symtoms after rebuild (without strainer) Fitted strainer but noticed that pick up pipe was bent and straightened it (too much) ergo no oil pressure.
bent it up some and magic, aok.
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- docchevron132
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Re: Lack of oil pressure.
Or... it could be that the pump is a bit weak and having had three days to drain wont pick up anymore. Equally, the pressure relief valve could have stuck?
1989 BX 17TD P2 Hybrid
1990 BX 16V It's got big hairy bollocks
1971 BL 350FG ambulance
1993 Dennis Lance 132 It's got mahooosive hairy bollocks!
Euthenasia, because enough's enough already.
1990 BX 16V It's got big hairy bollocks
1971 BL 350FG ambulance
1993 Dennis Lance 132 It's got mahooosive hairy bollocks!
Euthenasia, because enough's enough already.
- jonathan_dyane
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Re: Lack of oil pressure.
Assuming that the sender hasn't gone bad, it looks like you're going to be dropping the sump and taking off the oil pump to check and fill with vaseline.
Never left a XUD without oil, but have encountered other engines which have been left without oil and have then struggled to reprime. Strange one though...
Never left a XUD without oil, but have encountered other engines which have been left without oil and have then struggled to reprime. Strange one though...
Jonathan.
Working vehicle: 1986 Mercedes 190D 2.5
Broken: GS 1220 Estate, Tomos Noped several MZ's, David Brown 30D.
Working vehicle: 1986 Mercedes 190D 2.5
Broken: GS 1220 Estate, Tomos Noped several MZ's, David Brown 30D.
- David
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Re: Lack of oil pressure.
The issue with the strainer is in the oil line to the turbocharger where the feed is screwed into the back of the block, nothing to do with the oil pick-up in the sump...Philhod wrote: I think the clue is in your info David. The pick up point on all engines is very important.
And Doc, yes, I thought similarly.. an oil pump that just won't prime.. but I've never heard of that before on an XU engine...
Turns out that the engine does have oil pressure after all. Running the engine with no alternator belt on means I should have a battery warn lamp, and no oil pressure lamp. What I've got is the exact opposite. Yes, someone has got the oil pressure wire and the alternator exciter wire the wrong way around. Just blind luck that they are wired similarly in the dashboard so that they both still worked, just the wrong way around.
Just like a number of things on this car really. The A/C is nice, but the installation is a bit crappy. The addition of a one-touch system on the passenger side is nice, but the system doesn't work properly (can't be controlled from the driver's side) so it's crap. The problem I've just found is undoubtedly related to the installation of a GTi set of clocks. Nice to have the temperature gauge, but the installation is crap.
Ah well, at least the engine works....
... all landings are in fact controlled crashes, and any crash you can walk away from is a good landing. The definition of a good pilot is a man with the same number of landings as take-offs.
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Re: Lack of oil pressure.
Oh you mean the little plastic thingy in the pipe.
I've left those out before as they don't sell them separately. When I rebuilt the 2 litre HDI last year it split. I superglued it back together and refitted and it's been fine.
I've left those out before as they don't sell them separately. When I rebuilt the 2 litre HDI last year it split. I superglued it back together and refitted and it's been fine.
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- Bx Bandit
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Re: Lack of oil pressure.
Just out of curiosity mate what's the vaseline for? (see, I always pick up on the word vaseline )jonathan_dyane wrote:Assuming that the sender hasn't gone bad, it looks like you're going to be dropping the sump and taking off the oil pump to check and fill with vaseline.
Never left a XUD without oil, but have encountered other engines which have been left without oil and have then struggled to reprime. Strange one though...
....There he goes, one of God's own prototypes, a high powered mutant of some kind never even considered for mass production......too weird too live.....and too rare to die
- mat_the_cat
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Re: Lack of oil pressure.
It's something that will stay in the oil pump and effectively 'prime' it so it can suck up the oil from the sump. I *thought* the XUD had the pump in the sump anyway, so would be self priming?
I've had to use vaseline several times on Rover V8 engines as the pump is above the sump, although if it's just because it's been left for a while (rather than after a rebuild) you can sometimes get away with whipping off the dizzy and spinning over the oil pump with a drill.
I've had to use vaseline several times on Rover V8 engines as the pump is above the sump, although if it's just because it's been left for a while (rather than after a rebuild) you can sometimes get away with whipping off the dizzy and spinning over the oil pump with a drill.
- Bx Bandit
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Re: Lack of oil pressure.
Coh! Vaseline eh? So......................... many uses
....There he goes, one of God's own prototypes, a high powered mutant of some kind never even considered for mass production......too weird too live.....and too rare to die
- mat_the_cat
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Re: Lack of oil pressure.
I guess priming an oil pump is something that you can't use the old 'spit on your hand' method for?
- David
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Re: Lack of oil pressure.
Had to do this before on a kit car I was assisting with. Beautifully rebuilt 3.9 engine, and when asking the guy who built it about it I casually asked "oil pump full of vaseline ready is it?" "No. I didn't like the sound of that so I didn't do it."mat_the_cat wrote:I've had to use vaseline several times on Rover V8 engines as the pump is above the sump, although if it's just because it's been left for a while (rather than after a rebuild) you can sometimes get away with whipping off the dizzy and spinning over the oil pump with a drill.
Hmm. Dizzy out, driveshaft made up, and pistol drill running at 2000rpm. Took about 1 minute to achieve any pressure at all (engine would no doubt have been ruined by this number of revolutions) and then another minute to get good pressure and decent drainback.
Worked though...
... all landings are in fact controlled crashes, and any crash you can walk away from is a good landing. The definition of a good pilot is a man with the same number of landings as take-offs.
- charlie
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Re: Lack of oil pressure.
Bx Bandit wrote:jonathan_dyane wrote: Just out of curiosity mate what's the vaseline for? (see, I always pick up on the word vaseline )
meanwhile down in the bx sewer
mr bandit is hard at work
and i take advice off this bloke
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Re: Lack of oil pressure.
It lubricates all mating parts and makes things slide in and out smoothly, ye great twonkJust out of curiosity mate what's the vaseline for? (see, I always pick up on the word vaseline )
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- Bx Bandit
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Re: Lack of oil pressure.
....There he goes, one of God's own prototypes, a high powered mutant of some kind never even considered for mass production......too weird too live.....and too rare to die
- smiffy
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Re: Lack of oil pressure.
Right then boys and others, as some of you may know, I want to fit an oil pressure guage to my car, and I want to know if anyone can recommend an off the shelf T piece adaptor to go in the engine block? When I next do an oil change, I will also swap the sump for one that has a temperature probe in it.
You can never have too many toys and dials on your car!
You can never have too many toys and dials on your car!
They say an apple a day keeps the doctor away...
but now that most of them are muslim, I find bacon and sausages work better!
but now that most of them are muslim, I find bacon and sausages work better!
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Re: Lack of oil pressure.
Provided they work!!!!!
You can but T pieces with a screw connector for the gauge and an electrical terminal at the other.
Good quality Gauge kits come with one in ready
You can but T pieces with a screw connector for the gauge and an electrical terminal at the other.
Good quality Gauge kits come with one in ready
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- smiffy
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Re: Lack of oil pressure.
trouble is I don't know what thread size the pressure switch is. I think the gauge sender is M10x1, but as for the light switch, I don't know. Of course, I then have to make up a small wiring harness for it, together with the oil temp, and the red light of death too!
They say an apple a day keeps the doctor away...
but now that most of them are muslim, I find bacon and sausages work better!
but now that most of them are muslim, I find bacon and sausages work better!
- smiffy
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Re: Lack of oil pressure.
been snooping around, and I gather the oil switch is M16x1.5....nobody makes a t piece with M16, and M10!
They say an apple a day keeps the doctor away...
but now that most of them are muslim, I find bacon and sausages work better!
but now that most of them are muslim, I find bacon and sausages work better!
- mat_the_cat
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