[Fot] Fw: Help with Oil Pressure Problem

[Kas Kastner]

Speaking of cam bearings.  I had the exact same  oil pressure problem with
my TR-2 in 1955.  I changed rod bearings a couple times, check the
mains, and had all kinds of  older guys experience and advice. Nothing
helped.

Finally I took the engine totally apart and discovered that the front
camshaft bearing of the TR engine is this cast iron material and it was
oval (so to speak).  I replaced that front bearing and everything came back
to normal. Since then I have never seen that problem in hundreds of
engines. Because of the cam not having bearings in the six cylinder engines
the problem can occur there without any effort at all. That is why I fitted
the Spitfire cam bearings in the six cylinder blocks.

*Never be beaten by equipment.*


On Sat, Mar 8, 2014 at 11:49 AM, John Wagner <j.wags63 at yahoo.com> wrote:

> make sure the plugs on the ends of the rocker shaft are tight or have
> popped
> out.  As Tony would  say Don't ask me why I know that.
>
>
>
> On Saturday, March
> 8, 2014 11:20 AM, Larry Young <cartravel at pobox.com> wrote:
>
> I agree it would
> probably not be excessive rocker clearance as Greg
> explained.  However, no
> one has mentioned excessive cam bearing
> clearance. Not long ago we discussed
> this same problem with 6 cylinder
> motors. My TR250 has the same symptoms and
> I have wondered if cam
> bearings would solve the problem.
>
>
> On 3/6/2014 8:32
> PM, Greg Solow wrote:
> > I do not believe that the rocker assembly could cause
> this.  The
> > standard oil feed is though a restricted hole from the rear main
> > bearing to the rear cam bearing, then the feed is intermitently pulsed
> > by
> the rotation of the camshaft lining up a spiral groove in the rear
> > cam
> journal and some flats machined into the journal. I have by passed
> > this
> system and fed oil directly from the restricted drilling from the
> > rear
> main, to the drilling that goes up to the head. Doing this feed a
> > lot more
> oil the the rocker gear, but did not affect oil pressure at all.
> >
> Excessive clearance in the oil pump, either excessive end float on
> > the
> gears or excessive tip clearance between the rotors will give low
> > oil
> pressure at idle, The oil leaks back withing the pump at it
> > rotates slowly,
> but at the reves come up and the pump turns faster, I
> > think it can overcome
> this internal leakage and the pressure in the
> > engine will come up.
> >
>                 Greg Solow
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