Oil Pressure

[Bob Grunau]

Hi Josh,
good you found the problem. The gasket itself was not the problem, by
inserting the gasket on the pump cover you INCREASED the gear end clearance
way beyond the design clearance of 0.0016" to 0.0035". Therefore loss of
oil pressure.
If using a gasket ( which was not originally used ) , the gears must
protrude out beyond the pump body by the gasket thickness less the design
end clearance of the gears.
I have used a gasket on the cover when some DPO has machined the pump body
crooked and when cleaned up the face, the new pump gears were out beyond the
pump face. So a gasket ( or metal shim ) allows use of new gears without
cutting down their length. But make sure you never go below 0.0016" ( I
prefer to see 0.002" ) clearance as the pump gears heat up more than the
pump body and binding of the pump gears due to insuffucient end float can
ruin the pump drive gear and the camshaft gear. Not recommended.
Bob Grunau

Just a heads up to anyone with possibly the same problem:

For 3 years now I have an oil pressure problem when the engine oil is hot.

40 pounds when driving but as soon as I get to a traffic light the oil
pressure meter went to 0 !!!!!!

Since I had to replace the clutch, we took the engine out and while it was
easily accessible, my friend took the oil pump apart to have a look at the
aforementioned problem.

He recognized the problem as I had put a gasket in the top part of the oil
pump. There should be NO GASKET in the top part of the oil pump!!

He took it out and when everything was put together again I had 20 LBS
more
in idle and in normal driving revolutions. Probably I'm the only fool who
made that mistake, but just in case you have some room left in your brain
memory>>>>> do not ever put a gasket in the top part of your oil pump...

It's so nice to drive around with 65 pounds of oil pressure and see 20
pounds at the traffic light...

Cheers,

Josh in Calgary

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[James Hallett]

The guys completing the rebuild of my XPAG have just test run the engine.
With a Jaeger gauge connected directly to the block they had a reading of
120-140 on cold start and 70-90 after the oil had warmed up. Does this seem
too high, or is the fact that there is no remote copper tubing between the
block and the gauge going to account for a high reading?



Thanks!



James A H Hallett

TC 6902 Pembroke, Bermuda





Email : jhallett@elevado.org







[Non-text portions of this message have been removed]

[i.thomson@talk21.com]

"The guys completing the rebuild of my XPAG have just test run the
engine.
With a Jaeger gauge connected directly to the block they had a reading
of
120-140 on cold start and 70-90 after the oil had warmed up. Does this
seem
too high, or is the fact that there is no remote copper tubing between
the
block and the gauge going to account for a high reading?"


--------------

I am no expert in these matters but at first sight this is far too high. I would not expect that the lack of a line to to the gauge itself would account for this as the small gauge pipe would only restrict rate of pressure rise at the gauge. As there is no overall flow the reading would eventually settle at the actual oil pressure. I would look to the pressure relief valve in the pump which should restrict it to around 60-80psi ? Your re-builders did check this didn't they?

Regards
Ian Thomson





[Non-text portions of this message have been removed]

[John S. Kallend]

I'd check the gauge for accuracy before doing anything else.

_________________________________
John Kallend
Professor and Associate Dean
Armour College of Engineering, IIT

----- Original Message -----
From: i.thomson@talk21.com
Date: Tuesday, June 8, 2010 11:06 am
Subject: [mg-tabc] Oil Pressure

>
> "The guys completing the rebuild of my XPAG have just test run the
> engine.
> With a Jaeger gauge connected directly to the block they had a
> reading
> of
> 120-140 on cold start and 70-90 after the oil had warmed up. Does
> this
> seem
> too high, or is the fact that there is no remote copper tubing
> between
> the
> block and the gauge going to account for a high reading?"
>
>
> --------------
>
> I am no expert in these matters but at first sight this is far too
> high. I would not expect that the lack of a line to to the gauge
> itself would account for this as the small gauge pipe would only
> restrict rate of pressure rise at the gauge. As there is no overall
> flow the reading would eventually settle at the actual oil
> pressure. I would look to the pressure relief valve in the pump
> which should restrict it to around 60-80psi ? Your re-builders did
> check this didn't they?
>
> Regards
> Ian Thomson
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>

[John]

My XPAG in TC 7025 runs 70?C when warm. Really hot days it might get up to 75?C. It does not like parades.



-----Original Message-----
From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com]On Behalf Of i.thomson@talk21.com
Sent: Tuesday, June 08, 2010 12:07 PM
To: mg-tabc@yahoogroups.com
Subject: [mg-tabc] Oil Pressure




"The guys completing the rebuild of my XPAG have just test run the
engine.
With a Jaeger gauge connected directly to the block they had a reading
of
120-140 on cold start and 70-90 after the oil had warmed up. Does this
seem
too high, or is the fact that there is no remote copper tubing between
the
block and the gauge going to account for a high reading?"

--------------

I am no expert in these matters but at first sight this is far too high. I would not expect that the lack of a line to to the gauge
itself would account for this as the small gauge pipe would only restrict rate of pressure rise at the gauge. As there is no overall
flow the reading would eventually settle at the actual oil pressure. I would look to the pressure relief valve in the pump which
should restrict it to around 60-80psi ? Your re-builders did check this didn't they?

Regards
Ian Thomson

[Non-text portions of this message have been removed]






[Non-text portions of this message have been removed]

[Rothgene Roth]

You should be reading oil pressure at the lower outlet thru the special fitting, which has a small flow restricter hole and with the banjo assembly connected to the head. A flex hose on the fitting end then connects to the adapter that the small copper tube connects the gauge.
Gene Roth

----- Original Message -----
From: i.thomson@talk21.com
To: mg-tabc@yahoogroups.com
Sent: Tuesday, June 08, 2010 9:06 AM
Subject: [mg-tabc] Oil Pressure




"The guys completing the rebuild of my XPAG have just test run the
engine.
With a Jaeger gauge connected directly to the block they had a reading
of
120-140 on cold start and 70-90 after the oil had warmed up. Does this
seem
too high, or is the fact that there is no remote copper tubing between
the
block and the gauge going to account for a high reading?"

--------------

I am no expert in these matters but at first sight this is far too high. I would not expect that the lack of a line to to the gauge itself would account for this as the small gauge pipe would only restrict rate of pressure rise at the gauge. As there is no overall flow the reading would eventually settle at the actual oil pressure. I would look to the pressure relief valve in the pump which should restrict it to around 60-80psi ? Your re-builders did check this didn't they?

Regards
Ian Thomson

[Non-text portions of this message have been removed]





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[Stan Teitge]

Hello all

I just woke up to the fact all the info. I need is in the data base. delete delete.

Thanks Stan Teitge

SSI Canada