Sloan, Jim wrote:
> I Started up my 74 TR6 for the first time in 3-4 months last night. I
> became alarmed when the oil pressure gauge did not show pressure and the oil
> light stayed on after about 15-20 seconds. Shut it down and am uncertain
> what to do. It seems unlikely that all of a sudden my mechanical pump has
> failed. Also - no big puddle on the floor to indicate a full winter drain
> and the stick shows level between the marks.
> I looked in the archives where some listers mentioned removing the plugs
> and disconnecting the fuel line (do you just disconnect and pinch the end?)
> , then cranking the engine for a minute or two until pressure showed but
> this was for the 1st start on a rebuilt engine.. I thought I might try
> this but IS THIS the simplest way to test for pressure or the lack thereof
> and could it hurt the engine after a long winter?
> Also - the last act of autumn was to change the oil. I did run it after for
> a minute to get pressure. I also installed a spin on FRAM filter in place of
> my usual spin on Purolator and 10-30 instead of 20-50 just to hold it for
> the winter. I've seen list submissions re: bypass valves in some filters
> and not in others. Could the FRAM have anything to do with this? . Perhaps
> 20 seconds was not enough. Is there anything I should avoid doing so as
> not to risk damage? Thanks,
>
> Jim Sloan
>
Jim,
To avoid damage, don't let the engine run until you have oil pressure.
Disconnect a wire from the coil to disable spark.
Quick and dirty diagnostic - remove the oil pressure idiot light sender
from the block. Crank the engine. You should get a gusher of oil in a
few seconds, indicating your oil pump is good. OK, you can stop cranking
now, and clean up the mess...
If the pump is pumping, it's only a matter of time (30 seconds?) till
you get positive oil pressure, assuming you've put that switch back
in... When the idiot light goes out, reconnect the coil and start your
engine!
As for the Fram, even if it's bad it can't keep your engine from
nuilding oil pressure. It might be able to bypass its internal filter
element, but it can't shunt oil straight back to the sump. There is no
such path in the engine except the oil pressure bypass valve.
b
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