Joe, my TR4 race car has two oil pressure gauges, one reads before the
filter and the other reads at the oil gallery. In effect, one reads coming
out of the pump and the other reads after it has gone through the system.
If everything is normal, the gauge reading before the filter is about 10psi
higher than the reading at the oil gallery. On two occasions I have seen
the first gauge reading much higher than normal and the second gauge reading
much lower. The problem was a clogged oil filter and when the filter was
replaced everything went back to normal. My guess on the excess oil is that
if it can't get through the filter it's being forced out somewhere else.
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Sent: Friday, April 16, 2010 8:40 AM
Subject: [Fot] TR3/TR4 AMBRO OIL LEAK UNDER PRESSURE-APPARENTLY FILTER BODY
This one is new to me.....oil pressure appears normal at idle.
At road speed (3000 RPM) oil pressure starts to build higher to 75-80 psi
depending on the relief valve setting, and eventually settles back as the
engine reaches operating temps....about a 10 mile run..
Upon return to garage the area around the filter body is wet and about 1/3
a quart of oil has migrated to the transmission area and pools under the
car...a lot of oil.
I initially suspected the rear crank seal, but the amount of oil around the
filter body support tends to dispel that idea.
I now suspect a restriction of some kind, but it would be good if anyone has
experience this before and has a specific cause.
Outside of that, the AMBRO seems to be a remarkable car, so far, but needs
high speed runs with extreme cornering forces as part of the sorting
Looking forward to any experience or suggestions.