You need to measure the bearing clearances i think. plastigauge is accurate
enought for this purpose.
Gergo
2014-07-12 5:02 GMT+02:00 <healeymanjim@hansencc.net>:
> been working with a club member who has a bt7 with low oil pressure. this
> engine only has about a thousand miles on it since rebuild. when started
> up cold the most oil pressure we can get is about 40psi. when engine gets
> warm drops to about 30 at 2000rpm. the bypass valve and spring was
> replaced with no results. i have looked at the rocker arms and they just
> ooze oil out the top of the rockers. i have pulled one rod cap to see if
> maybe the rebuilder failed to install new bearings and they look like they
> just came from the box. did not have any plastigage to check clearances.
> changed what looked like a brand new rotor oil pump for geared pump and
> the oil presssure actually went down a few psi. the guage is very slow to
> react to increase in rpm and i am beginning to suspect an indicating
> problem somewhere other than guage because we put another good guage on it
> and nothing changed. we also pulled the spin on filter adapter to make
> sure it was on correctly. other than an inter
> nal leak of some kind i am out of ideas. also, at idle we are
> registering about 5-8psi on hot engine. any help appreciated. hjim
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