I'd look at the pressure relief, and the oil filter first as probable
causes. Next bet would be an oil pump issue. With new bearings, you have
eliminated that section of the problem. Also, look for oil on the ground-
did you replace all the gallery plugs? Could be you forgot one- usually the
most hidden one- and you have a leak.
Scott
----- Original Message -----
From: "Sloan, Jim" <JSloan@talisman-energy.com>
To: <triumphs@autox.team.net>
Sent: Tuesday, May 13, 2003 3:59 PM
Subject: Help! Lost Oil Pressure After Replacing Bearings, Thrust Washer s-
74 TR6
> I have just finished replacing the connecting rod and main bearings and
> thrust washers, got everything back together and turned over the engine
with
> the coil high tension removed until I got oil pressure (about 30-40
> seconds) . I then started it up and had about 75 or 80 lbs. for a minute
or
> so. With the engine running I then checked underneath for leaks and by
the
> time I got back to the cockpit the pressure was down to about 25 lbs.
and
> dropping. I immediately turned it off , disconnected the coil again
tried
> to turn it over to get pressure by turning the battery over - but gave up
> after a few seconds for fear of damage. Has this ever happened to
anyone?
> After removing the distributor I used a drill and slotted extension to
> spin the pump manually but no pressure.
> I don't know what to do next. I didn't leave anything foreign in the
sump
> or bottom end. There was a slight drop in idle when the pressure started
> dropping but the car ran fine for a couple minutes before that drastic
> pressure drop. Good thing I put lots of assembly lube on the bearings
but
> that's now washed away and I'm afraid to do anything but spin the pump
> manually which doesen't seem to be getting me anywhere.
> Is it possible I need a new pump - can they fail catastrophically like
that.
> It was within spec and even before replacing bearings I got 70 lbs cold
> and 50 hot cruising. I removed the sump and pump today and took a look
and
> all seems OK. I didn't think you could but could I have installed the pump
> wrong? It must have engaged the distributor shaft, as I got pressure
> initially and I don't think it would even bolt down if it didn't engage
> properly. Could it be the new filter or an oil passage clogged -
> wouldn't it just go through the other passages?. And what would clog it?
> Can a new filter be defective? The only other thing I did on re-assembly
> was extend the pump pick up strainer a 1/4 inch or so as it was a little
> short vs. the Bentley spec. I lubed everything including the pump with
> assembly lubricant and pre-filled the new (spin-on) oil filter. I even
> thought maybe not enough oil was replaced so that the pump ran for
awhile
> and then went dry waiting for oil to return to the sump but this seems
> unlikely as spinning the pump 1/2 hour later didn't get the pressure back
> up.
>
> Also -when viewing the timing marks leaning over the drivers side of
the
> engine compartment is "above TDC" the numbers above or below the "0"
> mark? My chalk mark has washed away and I need to re-set it close when I
> re-fit the distributor if I ever get pressure again.
>
> Any assistance or suggestions are greatly appreciated.
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