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post #1 of 12 (permalink) Old 08-12-2006, 10:48 AM Thread Starter
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oil pressure problems

I recently re-built my '78 2000 Spyder engine and since then the oil pressure has been low. To be frank it wasn't too good before either, and I spent some time on the oil pump ensuring minimum clearances and no binding of the gears. I was advised to run on 15/50 rather than the 15/40 GTX I was using and this made no difference. Indicated 50psi on start up dropping to 30-40 at speed and almost nothing at tick-over. I have changed the sender for a new Jaeger unit and there is no improvement in the reading on the instrument. Today I tried a mechanical gauge which showed a reading of 70+ psi at start up (rising to over 80 with an increase in revs) whilst the gauge showed it usual 50 and did not rise with the increase in revs. I have earthed the instrument and got a full scale needle movement so that appears to be OK. What else can be done? Is there adjustment on the instrument and more importantly how does one get it out of the dashboard other than by a total dis-assembly of the centre consul and central dash area.

Stuart
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post #2 of 12 (permalink) Old 08-12-2006, 01:21 PM
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Some oil pressure senders are adjustable. Remove the sender and look in the threaded part that screws into the block. If there's what looks like a flathead screw inside, that's the adjustment. Try turning it a bit in either direction and see what effect it has on the gauge.

Jim

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post #3 of 12 (permalink) Old 08-12-2006, 04:23 PM Thread Starter
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Thanks for that, I will try it to see what happens. Will keep you posted

Stuart
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post #4 of 12 (permalink) Old 08-12-2006, 11:21 PM
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Quote:
Originally Posted by alfazagato
I recently re-built my '78 2000 Spyder engine and since then the oil pressure has been low. To be frank it wasn't too good before either, and I spent some time on the oil pump ensuring minimum clearances and no binding of the gears. I was advised to run on 15/50 rather than the 15/40 GTX I was using and this made no difference. Indicated 50psi on start up dropping to 30-40 at speed and almost nothing at tick-over. I have changed the sender for a new Jaeger unit and there is no improvement in the reading on the instrument. Today I tried a mechanical gauge which showed a reading of 70+ psi at start up (rising to over 80 with an increase in revs) whilst the gauge showed it usual 50 and did not rise with the increase in revs. I have earthed the instrument and got a full scale needle movement so that appears to be OK. What else can be done? Is there adjustment on the instrument and more importantly how does one get it out of the dashboard other than by a total dis-assembly of the centre consul and central dash area.
You might want to take the car out and get it hot, then install you mechanical gauge and check your pressure again with hot oil.
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post #5 of 12 (permalink) Old 08-13-2006, 03:56 AM Thread Starter
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Did that this morning and there is the same difference in reading. Am searching for the adjuster screw that Papajam mentions. More later!

Stuart
'57 Spider Veloce, '57 Lightweight, '60 SZ, '76 2000 Spider. '60 Sprint
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post #6 of 12 (permalink) Old 08-13-2006, 04:39 AM
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And, some oil pressure senders fail. Do you have a spare available?. Trying a different sendor is easier than changing the guage.

Quote:
Originally Posted by papajam
Some oil pressure senders are adjustable. Remove the sender and look in the threaded part that screws into the block. If there's what looks like a flathead screw inside, that's the adjustment. Try turning it a bit in either direction and see what effect it has on the gauge.


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post #7 of 12 (permalink) Old 08-13-2006, 07:14 AM Thread Starter
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I am on the third sender!

Stuart
'57 Spider Veloce, '57 Lightweight, '60 SZ, '76 2000 Spider. '60 Sprint
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post #8 of 12 (permalink) Old 08-13-2006, 11:01 AM
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I don't know, man...I was under the impression that what you're seeing is normal behavior for the gauge. They're not very accurate, you know: they don't seem to ever go much over mid scale, and at hot idle it's normal for it to read at or near zero.

I think you might be chasing a ghost here.

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post #9 of 12 (permalink) Old 08-13-2006, 01:23 PM
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I agree with the previous post. As long as the idiot light is out, you're fine. What is the reading with the mechanical guage with a hot angine at idle? If it's more than about 15 pounds, you're okay.

Ian Cameron, 1980 Spider
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post #10 of 12 (permalink) Old 08-15-2006, 09:47 AM Thread Starter
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Problem solved. Instruments are Jaeger but a Jaeger sender won't work! Oh yes I hear you say. The truth of the matter is that there is an intermediate sender of no particular make which is listed as being for late 1750s but when fitted gives me a reading within a few pounds of the mechanical gauge. Job done! Classic Alfa did the trick.

Stuart
'57 Spider Veloce, '57 Lightweight, '60 SZ, '76 2000 Spider. '60 Sprint
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post #11 of 12 (permalink) Old 08-15-2006, 10:06 AM
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Wow. A Jaeger gauge that doesn't work properly with a Jaeger sender. Scarey!
Glad you got it working and thanks for the update!

Jim

Series 2 USA 1750 GTV (in Series 1 European clothing)
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post #12 of 12 (permalink) Old 08-15-2006, 02:20 PM Thread Starter
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Papajam, thanks for your advice. I will try to find the name of the sender that works. Could improve matters for a lot of us!

Stuart
'57 Spider Veloce, '57 Lightweight, '60 SZ, '76 2000 Spider. '60 Sprint
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