Andrew,
Contact the person who rebuilt the engine. The oil pressure problem you
describe will not be solved with a roll pin, or by changing the viscosity
of the oil. It very well could be a bad oil pump. It could be defective or
improperly installed. If the one you removed was up to spec and working
fine, that's the first thing I would revert back to. I assume all the
bearing tolerances were checked with plastic-gauge, are correct and were
properly installed. I'm sure you checked for the screw that holds the
rockers in place. If it's missing, oil to the rocker assembly is greatly
compromised, but even this would not account for the oil pressure you're
reporting since the oil pressure is read at the block.
Please let us know what you find.
Best,
Bob Fabie
'75
On Sat, Sep 14, 2013 at 8:55 PM, Andrew Packard <apackard68@att.net> wrote:
> Hello Triumph problem solvers.
>
> I nearly have my TR250 ready for Triumphest/VTR after an engine rebuild.
> I'm
> trying to solve a problem now with maintaining consistent oil pressure.
> When
> I first ran the car after the rebuild, the 20 minutes at 2000 rpm start, I
> had
> Castrol 5W30 and ZDDP additive. After the engine really got up to
> temperature, I had trouble with maintaining oil pressure, dropping way down
> close to zero at idle. A mechanic friend of mine checked it out with me
> and
> with the rocker cover off, we saw little flow at the rockers at idle. I
> had
> an external oiling line on my shelf so I added that and saw very good flow
> at
> start up when oil pressure was about 65 and settled down to just under 50
> as
> it started to get warm, but continued to drop to the same near zero level
> once
> it was at temperature.
>
> Today I changed the oil to 20W50 Castrol with Lucas ZDDP break-in additive.
> Same symptoms. I drove the car about four miles near my house and at
> temperature, I was running at 20-25 psi when driving, dropping to near
> zero at
> stop signs. When I arrived home, I removed the quite hot valve cover oil
> fill
> cap and started the car. Very little oil was dancing around, if any, at
> idle.
> I revved the car a bit and saw sufficient oil flowing and splattering in
> there.
>
> Now I don't know what to do. I have the braided oil pressure line from
> TSI.
> I don't think my gauge is bad with oil flow symptoms consistent with the
> pressure readings. Could the oil pressure regulator be an issue? Mine is
> relatively new from BPNW. I do have a second one I could swap in. The oil
> pump was new with the rebuild.
>
> Any advice or guidance is appreciated.
>
> Andy Packard
> CD6746L
> President - Triumph Travelers
> Autocross Chair - 2013 Triumphest/VTR
>
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>
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